By the end of this chapter, you will be able to:
Mastering these skills will help you produce high-quality Cheddar cheese that meets safety standards and satisfies customers in the real dairy trade.
Cheddar cheese production is a fundamental skill in dairy plant management, especially in Kenya where dairy farming and processing contribute significantly to the agricultural economy. Mastery of cheddar cheese processing concepts enables managers and technicians to ensure product quality, safety, and market competitiveness. This chapter provides a comprehensive understanding of the technical, operational, and quality aspects of cheddar cheese production, equipping professionals to oversee efficient and sustainable cheese manufacturing.
Cheddar cheese production involves a series of carefully controlled biochemical and physical processes that transform milk into a firm, flavorful cheese. Understanding the terminology, classification, raw material requirements, and processing principles is essential for quality control and innovation in Kenyan dairy plants.
This subtopic clarifies key terminology used in cheddar cheese processing, ensuring clear communication and understanding among dairy professionals.
Cheese is a dairy product derived from milk through coagulation of casein proteins, resulting in a solid or semi-solid matrix containing fat, protein, and water. It undergoes fermentation and ripening to develop distinct flavors and textures.
Coagulation refers to the process where milk proteins aggregate to form curds, typically initiated by enzymes such as rennet or acidification. This step separates curds from whey, setting the foundation for cheese structure.
Curd is the solid mass formed from coagulated milk proteins, which is processed further to develop cheese. The quality and handling of curd influence the final cheese texture and moisture content.
Whey is the liquid by-product separated from curd during cheese making, rich in lactose, whey proteins, and minerals. Proper whey removal affects cheese firmness and shelf life.
Ripening is the biochemical process during which cheese develops its flavor, aroma, and texture through enzymatic and microbial activity over time. Controlled ripening conditions are critical for cheddar cheese quality.
Cheese classification organizes the diverse varieties based on moisture content, texture, processing methods, and microbial activity, guiding production and marketing strategies.
Fresh cheeses are unaged, high-moisture products like cottage cheese and cream cheese, consumed shortly after manufacture. They have mild flavors and soft textures.
Soft-ripened cheeses such as Camembert have a creamy texture and edible rind formed by surface molds during ripening. These cheeses require specific environmental control.
Semi-hard cheeses like Gouda possess moderate moisture and firmness, often undergoing shorter ripening periods. They are versatile in culinary applications.
Hard cheeses including cheddar have low moisture content and firm texture, developed through extended ripening. Their durability makes them suitable for storage and export markets.
Processed cheese is manufactured by blending natural cheese with emulsifiers, stabilizers, and sometimes other ingredients to create a uniform, meltable product with extended shelf life.
The quality of milk is paramount in cheese production, impacting yield, safety, and sensory attributes. Kenyan dairy plants rely heavily on raw milk from diverse sources, necessitating stringent quality controls.
Milk intended for cheddar cheese should have balanced fat and protein levels, typically around 3.5-4.0% fat and 3.0-3.5% protein, to ensure optimal curd formation and texture.
Milk must have low bacterial counts and be free from pathogens such as Salmonella and Listeria to prevent spoilage and ensure food safety. Regular testing is mandatory.
A low somatic cell count (SCC) indicates healthy udder conditions and milk quality. High SCC adversely affects cheese yield and texture.
Milk must be free from antibiotic residues that can inhibit starter cultures and pose health risks. Sampling and screening procedures are essential.
Milk should be cooled promptly to 4°C after milking and processed within 24 hours to minimize microbial growth and maintain quality.
Milk undergoes pre-treatments before cheese making to ensure safety, standardization, and optimal processing performance in Kenyan dairy plants.
Pasteurization involves heating milk to eliminate pathogenic microorganisms, typically at 72°C for 15 seconds (HTST method). This step is critical for consumer safety.
Adjusting fat and solids-not-fat content in milk to desired levels ensures consistent cheese quality and yield. This is achieved by separating and recombining cream and skim milk.
Clarification removes physical impurities such as dirt and somatic cells using centrifugal separators, improving milk purity.
Milk is rapidly cooled after pasteurization to the optimal temperature (30-32°C) for starter culture addition and coagulation.
Homogenization breaks down fat globules to prevent creaming, though it is less common in cheddar production as it may affect texture.
Additives enhance cheese texture, flavor, and shelf life, complying with Kenyan food safety regulations and consumer preferences.
Lactic acid bacteria starter cultures ferment lactose into lactic acid, lowering pH and aiding coagulation and flavor development.
Rennet enzymes, typically from calf stomach or microbial sources, catalyze coagulation by cleaving casein proteins.
Calcium chloride improves milk coagulation efficiency, especially in pasteurized or stored milk, by restoring calcium balance.
Salt adds flavor, controls moisture, and inhibits undesirable microbial growth during cheese ripening.
Annatto or natural colorants enhance the characteristic yellow-orange hue of cheddar cheese, meeting consumer expectations.
Cheese making follows systematic operations ensuring consistent quality, yield, and safety in Kenyan dairy factories.
Milk is standardized, pasteurized, and cooled to optimal conditions for starter culture addition.
Starter cultures ferment lactose, reducing pH to promote coagulation and inhibit spoilage organisms.
Rennet addition initiates curd formation, which is allowed to set for a specific time to achieve firmness.
Curd is cut into small pieces to release whey, then gently heated to firm the curd and expel more whey.
Curd slabs are stacked and turned repeatedly to expel whey and develop texture, then milled into uniform pieces.
Salt is mixed into curd to control moisture and flavor, followed by pressing into molds to form blocks.
Cheese blocks are stored under controlled temperature and humidity for weeks to months to develop flavor and texture.
Cheddar cheese is distinguished by its texture, flavor, and appearance, which are critical quality attributes in the Kenyan market.
Cheddar has a firm, smooth, and slightly crumbly texture that becomes drier and more brittle with age.
It exhibits a mild to sharp, nutty flavor that intensifies with ripening due to proteolysis and lipolysis.
The cheese is pale to deep yellow-orange, uniform in color with a smooth surface, often enhanced by annatto coloring.
Typical moisture content ranges from 36% in young cheddar to about 32% in mature cheese, affecting shelf life and firmness.
The pH at pressing is around 5.1 to 5.3, dropping slightly during ripening, influencing texture and microbial stability.
Emulsifiers are additives that stabilize fat and water phases in cheese, especially in processed cheese varieties.
They improve texture, meltability, and shelf life by preventing fat separation during heating and storage.
Sodium citrate, sodium phosphate, and tartrate salts are widely used in processed cheese production.
Emulsifiers used must comply with Kenyan food safety standards and be listed in product labeling.
Proper emulsifier use maintains natural cheese flavor without imparting off-tastes.
Emulsifiers are typically added during blending and melting stages to ensure uniform distribution.
Cream is the high-fat component of milk used in cheese making for fat standardization and product variation.
Cream contains 30-40% fat and is separated from milk by centrifugation.
It is added to standardize milk fat to desired levels for consistent texture and yield.
Cream must be fresh-free from rancidity, and microbiologically safe to prevent cheese defects.
Stored at 4°C and used promptly to maintain quality and prevent microbial growth.
Fat content influences mouthfeel, flavor release, and overall cheese richness.
Pasteurized milk is the primary raw material in dairy plants for cheddar cheese, ensuring safety and quality.
Common methods include High Temperature Short Time (HTST) and Ultra-High Temperature (UHT), with HTST preferred for cheese.
Pasteurization destroys pathogens but may reduce native enzymes, requiring starter cultures for acidification.
Temperature and time parameters must be strictly monitored to avoid under or over-processing.
Milk should be cooled rapidly and processed within 24 hours to maintain freshness.
Compliance with Kenya Bureau of Standards (KEBS) and Kenya Dairy Board (KDB) guidelines is mandatory.
Flavor development in cheddar cheese is a complex biochemical process influenced by milk quality, starter cultures, and ripening conditions.
Proteolysis and lipolysis during ripening release peptides and free fatty acids responsible for characteristic cheddar flavors.
Different strains of lactic acid bacteria produce varying flavor compounds, affecting cheese taste profiles.
Temperature and humidity control optimize enzymatic activity and flavor development.
Salt and food colorants can influence perceived flavor intensity and appearance.
Kenyan consumers often prefer mild to medium sharp cheddar, guiding production parameters.
Packaging materials protect cheddar cheese from contamination, moisture loss, and physical damage during storage and distribution.
Common materials include wax-coated paper, plastic films, vacuum packs, and foil laminates.
Effective packaging prevents oxygen and moisture ingress, preserving cheese quality.
Materials must be food-grade, non-toxic, and compliant with KEBS standards.
Increasing demand for biodegradable and recyclable packaging to reduce environmental impact.
Packaging must include product information, batch number, expiry date, and storage instructions.
Food colour enhances the visual appeal of cheddar cheese, influencing consumer perception and acceptance.
Annatto is widely used to impart the characteristic orange-yellow hue to cheddar cheese.
Natural colourants are preferred for health and marketing reasons, though synthetic options exist.
Colourants must be used within permissible limits set by Kenyan food regulations.
Proper colourant use does not affect flavor or texture but improves marketability.
Colourants are typically added during milk standardization or curd processing stages.
Emulsifiers facilitate the homogeneous mixing of fat and water phases in cheese, especially processed varieties.
They improve meltability, texture, and shelf stability by preventing fat separation.
Phosphates, citrates, and tartrates are common emulsifiers in processed cheese.
Precise dosing is essential to avoid textural defects or off-flavors.
Emulsifiers must be compatible with other cheese ingredients and processing conditions.
Only approved emulsifiers listed by KEBS and KDB are permitted in cheese manufacture.
Stabilizers are additives that maintain the physical and chemical stability of cheese products during processing and storage.
They prevent syneresis (water separation) and improve texture consistency.
Carrageenan, xanthan gum, and guar gum are widely used in processed cheese.
Added during blending to ensure uniform dispersion.
Stabilizers enhance moisture retention, extending product freshness.
Use must conform to Kenyan food additive regulations.
Preservatives inhibit microbial growth, extending the shelf life of cheese products under Kenyan food safety standards.
Sorbates and benzoates are typical preservatives allowed in cheese processing.
They prevent mold and yeast growth on cheese surfaces during storage.
Concentrations must adhere to legal limits to avoid health risks.
Preservatives may be applied as surface treatments or incorporated into the cheese mass.
Minimal use is preferred to maintain natural product appeal.
Skim milk powder is a dry dairy ingredient used in cheese making to adjust solids content and improve yield.
It contains non-fat solids such as proteins and lactose, with minimal fat.
Added to milk to increase protein content, enhancing curd firmness and cheese yield.
Must be free from contaminants and moisture to prevent spoilage.
Stored in dry, cool conditions to maintain quality.
Dosage is calculated based on desired milk solids and cheese specifications.
Water used in dairy plants must meet strict quality standards to prevent contamination and ensure hygiene.
Water should be potable-free from microbial and chemical contaminants as per KEBS guidelines.
Used for equipment cleaning, ingredient preparation, and sanitation.
Regular testing ensures ongoing compliance.
Filtration, chlorination, or UV treatment are common to maintain water safety.
Poor water quality can introduce spoilage organisms or off-flavors.
Effective processed cheese production depends on specialized equipment designed for melting, blending, and packaging.
| Name | Specification | Use |
|---|---|---|
| Cheese Vat | Stainless steel, 500-2000L capacity | Heating and melting base cheese |
| Cheese Mould | Food-grade plastic or stainless steel | Shaping cheese blocks |
| Knives | Stainless steel, various sizes | Cutting curd and cheese blocks |
| Cheese Cloth | Food-grade cotton, fine weave | Draining whey from curds |
| Thermometer | Digital or analog, -10°C to 120°C range | Monitoring temperature control |
| Pasteurizer | Plate or tubular, HTST capable | Milk pasteurization |
| Blender | Stainless steel, variable speed | Mixing cheese ingredients |
| Cold Room | Controlled 2-6°C, humidity regulated | Cheese storage and ripening |
The cheese vat is a critical piece of equipment in cheddar production, facilitating controlled coagulation and curd processing.
Constructed from stainless steel to prevent corrosion and contamination, vats vary in capacity from small pilot scales to large industrial volumes.
Equipped with heating and cooling jackets to maintain precise temperatures during acidification and cooking stages.
Gentle stirring prevents curd matting and ensures uniform heat distribution.
Vats must be cleaned with CIP (Clean-In-Place) systems to maintain hygiene and prevent microbial contamination.
Cheese moulds define the shape and size of cheddar blocks and influence moisture expulsion during pressing.
Made from food-grade plastic or stainless steel, moulds must be non-reactive and easy to sanitize.
Moulds come in cylindrical or rectangular forms, with perforations to allow whey drainage.
Designed to fit pressing equipment that applies uniform pressure to consolidate curd.
Regular sanitation prevents cross-contamination and product defects.
Curd knives include harp knives, wire knives, and blade knives, each suited for different curd sizes.
Stainless steel construction prevents rust and contamination; knives require frequent sharpening and cleaning.
Proper cutting minimizes curd damage and optimizes whey separation.
Operators must follow safety protocols to prevent injury during handling.
Cheese cloth is used to wrap curd during whey drainage and pressing, influencing moisture retention and texture.
Made from fine-weave, food-grade cotton that allows whey passage but retains curd particles.
Cloths can be reused after thorough cleaning and sanitation, reducing operational costs.
Stored dry and clean to prevent microbial growth and contamination.
Proper cloth use ensures uniform moisture removal and curd integrity.
Accurate temperature measurement is vital during cheese processing to ensure microbial safety and product consistency.
Digital and analog thermometers with ranges suitable for milk pasteurization and cheese ripening.
Regular calibration ensures measurement accuracy.
Thermometers are placed in milk vats, pasteurizers, and ripening rooms for continuous monitoring.
Proper cleaning and storage prevent sensor damage and contamination.
Pasteurization equipment ensures milk safety by eliminating pathogens before cheese production.
Plate and tubular heat exchangers are common, with HTST technology preferred for cheese milk.
Milk is heated rapidly to target temperature, held for prescribed time, then cooled.
Temperature and flow rate sensors ensure compliance with safety standards.
Routine cleaning and inspection prevent fouling and equipment failure.
Blenders mix cheese base with emulsifiers, stabilizers, and other ingredients uniformly during processed cheese production.
Stainless steel construction with variable speed controls for precise mixing.
Ingredients are added in stages to ensure homogeneity and prevent lump formation.
CIP systems or manual cleaning maintain hygiene standards.
Interlocks and emergency stops protect operators during use.
Cold storage facilities are essential for controlling cheese ripening and preventing spoilage.
Typically maintained between 2°C and 6°C to slow microbial activity and enzymatic reactions.
Relative humidity of 85-90% prevents cheese drying and surface cracking.
Sized to accommodate production volumes and variety of cheese products.
Temperature and humidity logging ensure consistent conditions.
Processed cheese manufacturing involves blending natural cheese with additives to produce a consistent, meltable product suitable for diverse applications.
Base cheeses with compatible flavors and textures, often cheddar or similar, are chosen for blending.
Base cheese is combined with emulsifiers, stabilizers, and other ingredients to achieve desired properties.
The blend is heated and stirred to create a homogeneous molten mass, facilitating emulsification.
The molten cheese is cooled rapidly to solidify and stabilize the product.
Processed cheese is packaged in airtight containers to preserve quality and extend shelf life.
Choosing the appropriate base cheese is critical for processed cheese quality and consumer acceptance.
Base cheese should have a neutral to mild flavor to allow additive blending without overpowering taste.
Cheeses with good meltability and plasticity are preferred to ensure smooth processed cheese.
Younger cheeses offer milder flavors, while older cheeses impart sharper notes; blending balances these attributes.
Optimal moisture levels facilitate emulsification and texture control.
Base cheese selection also reflects economic factors balancing quality and production costs.
Blending integrates base cheese with functional ingredients, influencing product consistency and performance.
Precise ratios of cheese, emulsifiers, stabilizers, and water are critical for target texture.
Mechanical blenders ensure uniform distribution of all components.
Blending occurs at controlled temperatures to prevent premature setting or separation.
Viscosity and homogeneity tests confirm blending success.
Batch records support traceability and quality assurance.
Heating the blended cheese mass activates emulsifiers and achieves a uniform molten state.
Typically between 70°C and 80°C to melt cheese without protein denaturation.
Continuous agitation prevents burning and ensures even heat distribution.
Heat and mechanical action disperse fat and protein uniformly.
Maintaining temperature for specified time ensures complete melting and ingredient integration.
Temperature and viscosity sensors maintain process control.
Rapid cooling solidifies processed cheese, stabilizing texture and extending shelf life.
Cooling tunnels, water baths, or refrigerated rooms are used depending on production scale.
Product is cooled to 4-8°C to prevent microbial growth.
Cooling precedes packaging to maintain shape and quality.
Controlled cooling prevents moisture accumulation on packaging.
Cooled cheese is transferred to cold storage before distribution.
Quality assessment ensures processed cheese meets safety, sensory, and regulatory standards.
Texture, meltability, and appearance are evaluated against specifications.
Moisture, fat, protein, and salt content are measured for compliance.
Pathogen and spoilage organism counts confirm safety.
Seals and materials are inspected for defects.
Test results are recorded for traceability and continuous improvement.
Sensory analysis involves trained panels assessing flavor, texture, aroma, and appearance to ensure consumer acceptance.
Individuals with trained sensory acuity are chosen for consistent results.
Flavor profiles, mouthfeel, color, and aroma are systematically scored.
Controlled settings minimize external influences.
Sensory tests are conducted routinely during product development and production.
Results guide formulation adjustments and quality control.
Shelf-life studies determine the duration processed cheese remains safe and desirable under specified storage conditions.
Monitoring microbial growth over time predicts spoilage onset.
Texture and appearance are assessed for degradation.
Oxidation and flavor changes are monitored.
Barrier properties influence shelf life.
Temperature and humidity impact longevity.
Packaging protects processed cheese from contamination and quality loss while facilitating handling and marketing.
Slices, blocks, spreads, and individually wrapped portions cater to diverse consumer needs.
Plastic films, foil laminates, and vacuum packs provide barrier protection.
Nutritional information, expiry dates, and batch codes ensure compliance.
Heat sealing and vacuum packaging extend shelf life.
Resealable and portion-controlled packages enhance usability.
Automated packaging equipment improves efficiency and hygiene in processed cheese handling.
| Name | Specification | Use |
|---|---|---|
| Heat Sealer | Adjustable temperature, hand-held or automatic | Sealing plastic and foil packages |
| Vacuum Packer | Vacuum pressure 0.8 bar, stainless steel | Removing air for extended shelf life |
| Slicing Machine | Variable slice thickness, stainless steel | Portioning cheese blocks |
| Labeling Machine | Automated label applicator | Applying product labels |
Selecting appropriate packaging materials balances protection, cost, and sustainability.
Flexible, moisture-resistant films protect cheese but raise environmental concerns.
Provide excellent barriers to light, oxygen, and moisture.
Wax-coated or laminated papers offer moderate protection with better biodegradability.
Emerging materials such as PLA and cellulose films reduce environmental footprint.
Material choice impacts packaging cost and shelf life.
Packaging ensures product integrity, safety, and marketability in Kenyan dairy supply chains.
Prevents contamination, physical damage, and moisture loss.
Maintains flavor, texture, and freshness over shelf life.
Facilitates storage, transport, and consumer use.
Supports product differentiation and customer loyalty.
Ensures adherence to labeling and safety standards.
Proper storage conditions are critical to maintain processed cheese quality from production to consumption.
Maintaining 2-6°C slows microbial growth and enzymatic changes.
High humidity prevents drying and surface cracking.
Implementing FIFO reduces spoilage and waste.
Storage areas must be secured against rodents and insects.
Regular inspection ensures adherence to storage protocols.
Optimal environmental parameters preserve processed cheese quality over time.
2°C to 6°C is ideal for processed cheese storage.
85-90% humidity prevents moisture loss.
Protection from light prevents oxidative flavor changes.
Adequate ventilation prevents condensation and mold growth.
Storage time must align with product shelf life to avoid spoilage.
First In First Out (FIFO) is a fundamental stock management principle ensuring older products are used before newer ones.
Products are arranged so that oldest stock is accessed first, minimizing expiry risks.
Clear labeling and organized shelving support FIFO.
Reduces waste, improves inventory control, and ensures product freshness.
Requires staff training and consistent monitoring.
Inventory management software can facilitate FIFO adherence.
Appropriate equipment supports optimal storage conditions and product handling.
| Name | Specification | Use |
|---|---|---|
| Refrigerated Shelves | Adjustable temperature 2-6°C, stainless steel | Storing cheese blocks and packaged products |
| Pallet Racks | Heavy-duty steel, adjustable height | Organizing stock for accessibility |
| Temperature Logger | Digital, data storage capacity | Monitoring storage conditions |
| Humidifier | Adjustable humidity control | Maintaining relative humidity |
Modern dairy plants in Kenya are adopting smart technologies and sustainable practices to improve efficiency and environmental impact.
Automated process control systems optimize temperature, mixing, and packaging operations.
Real-time monitoring and data analysis enhance quality control and traceability.
Use of energy-saving equipment and renewable sources reduces operational costs.
Process optimization minimizes raw material losses and waste generation.
Continuous education ensures adoption of sustainable practices.
Artificial Intelligence (AI) is increasingly integrated into dairy processing for predictive maintenance and quality assurance.
AI algorithms analyze equipment data to predict failures, reducing downtime.
Machine learning models assess product parameters for consistency.
AI adjusts processing parameters in real time to maximize yield and quality.
AI facilitates demand forecasting and inventory control.
Implementation requires investment and skilled personnel.
Sustainable packaging addresses environmental concerns while maintaining product protection.
Use of compostable films derived from plant-based polymers reduces plastic waste.
Materials designed for easy recycling support circular economy goals.
Reducing packaging layers and volume limits resource use.
Labeling to encourage proper disposal and recycling.
Partnerships promote development and adoption of sustainable packaging.
Effective waste management in dairy plants minimizes environmental impact and promotes resource recovery.
Separating organic and inorganic waste facilitates recycling and composting.
Organic waste such as whey can be used in anaerobic digesters to produce energy.
Packaging and equipment wastes are recycled to reduce landfill burden.
Adhering to Kenyan environmental laws prevents penalties and promotes sustainability.
Collaborating with local communities enhances waste management effectiveness and social responsibility.
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Create a free accountThis chapter provides a comprehensive overview of cheddar cheese production, beginning with essential processing concepts including definitions, classification, and the quality requirements for cheese milk. It details the procedures for raw milk sampling and quality analysis, emphasizing tests such as organoleptic and pH evaluation. The equipment and materials necessary for cheddar cheese making are described, covering everything from raw milk and cultures to specialized tools like cheese vats and presses. The cheese making process is thoroughly explained, outlining steps from milk standardization and pasteurization to acidification, coagulation, curd handling, salting, and pressing. Ripening is explored through its conditions and impact on cheese quality, followed by methods for evaluating cheddar cheese including sensory tests, yield, and shelf-life assessment. Packaging techniques and materials are discussed alongside storage principles and hygiene practices to ensure product safety and quality. Finally, the chapter addresses waste disposal, record-keeping, and the integration of smart and sustainable systems such as AI applications and eco-friendly packaging to enhance efficiency and environmental responsibility in cheddar cheese processing.
Type: Individual
| Tools & Equipment | Materials |
|---|---|
| Sterile sampling bottles | Fresh raw cow milk sample |
| Thermometer (0-100°C) | Alcohol swabs |
| pH meter or pH strips | Resazurin powder |
| Test tubes | Alcohol (70%) |
| Test tube rack | Clean disposable gloves |
| Clot on boiling test apparatus | Lab coat |
| Lactometer | Hair net |
| Digital weighing scale | Hand sanitizer |
| Timer or stopwatch | Clean distilled water |
| Antibiotic test kit |
| S/N | Item | Quantity |
|---|---|---|
| 1 | Sterile sampling bottles | 3 Pcs per Candidate |
| 2 | Alcohol swabs | 5 Pcs per Candidate |
| 3 | Thermometer (0-100°C) | 1 Pc per Candidate |
| 4 | pH meter or pH strips | 1 Pc per Candidate |
| 5 | Test tubes | 5 Pcs per Candidate |
| 6 | Test tube rack | 1 Pc per Candidate |
| 7 | Clot on boiling test apparatus (small saucepan or beaker) | 1 Pc per Candidate |
| 8 | Resazurin powder | 0.1 g per Candidate |
| 9 | Alcohol (70%) | 20 ml per Candidate |
| 10 | Lactometer | 1 Pc per Candidate |
| 11 | Antibiotic test kit | 1 Kit per 5 Candidates |
| 12 | Digital weighing scale | 1 Pc per Candidate |
| 13 | Clean disposable gloves | 1 Pair per Candidate |
| 14 | Lab coat | 1 Pc per Candidate |
| 15 | Hair net | 1 Pc per Candidate |
| 16 | Hand sanitizer | 50 ml per Candidate |
| 17 | Timer or stopwatch | 1 Pc per Candidate |
| 18 | Clean distilled water | 100 ml per Candidate |
| 19 | Fresh raw cow milk sample | 1 Liter per Candidate |
| Items to be Evaluated | Marks Available | Marks Obtained | Comments |
|---|---|---|---|
| TASK 1: Raw milk sampling and quality analysis | |||
| Wore appropriate PPE: hair net, lab coat, disposable gloves (Award 1 mark for each or zero x 3 = 3 marks) | 3 | ||
| Sanitized hands with hand sanitizer before sampling (Award 2 marks or zero = 2 marks) | 2 | ||
| Sanitized sampling bottle and equipment using alcohol swabs (Award 3 marks or zero = 3 marks) | 3 | ||
| Collected raw milk sample aseptically into sterile bottle (500 ml) (Award 4 marks or zero = 4 marks) | 4 | ||
| Measured milk temperature immediately after sampling (32-35°C) (Award 3 marks or zero = 3 marks) | 3 | ||
| Performed organoleptic test (appearance, odor, color) (Award 4 marks or zero = 4 marks) | 4 | ||
| Conducted clot on boiling test correctly (Award 4 marks or zero = 4 marks) | 4 | ||
| Performed resazurin test and interpreted color change (Award 5 marks or zero = 5 marks) | 5 | ||
| Conducted alcohol test properly and recorded results (Award 4 marks or zero = 4 marks) | 4 | ||
| Measured milk density using lactometer and temperature correction (Award 4 marks or zero = 4 marks) | 4 | ||
| Tested milk for antibiotic residues using test kit (Award 4 marks or zero = 4 marks) | 4 | ||
| Measured milk pH accurately using pH meter or strips (Award 4 marks or zero = 4 marks) | 4 | ||
| Sub-Total | 44 | ||
| PRODUCT CHECKLIST | |||
| Correct volume of milk sampled (500 ml) in sterile bottle (Award 3 marks or zero = 3 marks) | 3 | ||
| Accurate and complete recording of all test results (Award 4 marks or zero = 4 marks) | 4 | ||
| Proper interpretation of milk quality tests for cheddar cheese suitability (Award 5 marks or zero = 5 marks) | 5 | ||
| Sub-Total | 12 | ||
| GRAND TOTAL | 56 | ||
Type: Individual
| Tools & Equipment | Materials |
|---|---|
| Stainless steel pot (5-10 litres capacity) | Fresh cow milk |
| Thermometer (0-100°C) | Citric acid powder |
| pH meter or pH strips | Non-iodized salt |
| Plastic or stainless steel bowl | Clean water (potable) |
| Stainless steel ladle/spoon | |
| Measuring jug/cup | |
| Digital weighing scale | |
| Dropper |
| S/N | Item | Quantity |
|---|---|---|
| 1 | Stainless steel pot (5-10 litres capacity) | 1 Pc per Candidate |
| 2 | Thermometer (0-100°C) | 1 Pc per Candidate |
| 3 | pH meter or pH strips | 1 Pc per Candidate |
| 4 | Plastic or stainless steel bowl | 2 Pcs per Candidate |
| 5 | Stainless steel ladle/spoon | 1 Pc per Candidate |
| 6 | Measuring jug/cup | 1 Pc per Candidate |
| 7 | Digital weighing scale | 1 Pc per Candidate |
| 8 | Dropper | 1 Pc per Candidate |
| 9 | Food grade sanitizing solution | Sufficient for all Candidates |
| 10 | Disposable gloves | 1 Pair per Candidate |
| 11 | Hair net | 1 Pc per Candidate |
| 12 | Lab coat | 1 Pc per Candidate |
| 13 | Closed shoes | 1 Pair per Candidate |
| 14 | Fresh cow milk | 2 Litres per Candidate |
| 15 | Non-iodized salt | 10 g per Candidate |
| 16 | Citric acid powder | 2 g per Candidate |
| 17 | Clean water (potable) | 1 Litre per Candidate |
| Items to be Evaluated | Marks Available | Marks Obtained | Comments |
|---|---|---|---|
| TASK 1: Preparation and Pre-treatment of Cheese Milk | |||
| Wore appropriate PPE: hair net, disposable gloves, lab coat, closed shoes (Award 1 mark for each item or zero = 4 marks) | 4 | ||
| Sanitized all equipment and work area including pot, thermometer, ladle, bowls, measuring jug, and scale (Award 1 mark for each sanitized item or zero x 8 = 8 marks) | 8 | ||
| Washed hands properly with clean water before starting (Award 2 marks or zero = 2 marks) | 2 | ||
| Weighed 2 litres of fresh milk and recorded accurately (Award 3 marks or zero = 3 marks) | 3 | ||
| Standardized milk fat content to 3.5% by adding/removing cream or skim milk and mixed thoroughly (Award 4 marks or zero = 4 marks) | 4 | ||
| Measured and adjusted pH of milk to 6.6 - 6.8 using citric acid dissolved in water (Award 3 marks or zero = 3 marks) | 3 | ||
| Pasteurized milk by heating to 72°C and holding for 15 seconds with continuous stirring (Award 5 marks or zero = 5 marks) | 5 | ||
| Cooled pasteurized milk rapidly to 32°C and held at that temperature (Award 3 marks or zero = 3 marks) | 3 | ||
| Recorded all temperature and time measurements accurately during processing (Award 3 marks or zero = 3 marks) | 3 | ||
| Sub-Total | 35 | ||
| PRODUCT CHECKLIST | |||
| Milk standardized to 3.5% fat content within ±0.1%, pasteurized at 72°C for 15 seconds and cooled to 32°C (Award full 15 marks if all parameters met accurately, else partial marks accordingly) | 15 | ||
| Sub-Total | 15 | ||
| GRAND TOTAL | 50 | ||
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