Preservation of Milk & Milk Products

By Skumar -

 

Preservation of Milk & Milk Products, 


Milk is a highly nutritious but highly perishable food. Proper preservation, utilization of by-products, and modern packaging techniques are essential to ensure safety, quality, longer shelf life, and economic efficiency in the dairy industry.

🧊 I. Preservation of Milk and Milk Products

Preservation means preventing spoilage by controlling microbial growth, enzymatic activity, and chemical changes.

1️⃣ Physical Methods of Preservation

These methods use temperature or physical treatment.

🔹 a) Chilling & Refrigeration

  • Milk cooled to ≤4°C

  • Slows bacterial growth

  • Used immediately after milking

🔹 b) Freezing

  • Used for butter, ice cream

  • Stops microbial activity

  • Long-term storage

🔹 c) Heat Treatment

  • Pasteurization: Destroys pathogens

  • Sterilization / UHT: Extends shelf life to months

🔹 d) Drying (Dehydration)

  • Milk powder production

  • Removes moisture → no microbial growth

✅ Advantages: Safe, effective, widely accepted
❌ Limitations: High cost, may affect nutrients

2️⃣ Chemical Preservation

Use of approved chemicals to inhibit microbes.

Common Chemical Preservatives:

  • Sodium benzoate

  • Potassium sorbate

  • Hydrogen peroxide (limited use)

  • Nitrates / Nitrites (processed cheese)

⚠️ Use is strictly regulated by FSSAI
❌ Not allowed in liquid milk for direct consumption

3️⃣ Biological Preservation

Uses beneficial microorganisms or their products.

🔹 Lactic Acid Bacteria (LAB)

  • Convert lactose → lactic acid

  • Reduce pH → inhibit spoilage bacteria

Examples:

  • Curd

  • Yogurt

  • Cheese

  • Buttermilk

✅ Natural and safe
✅ Improves digestibility and shelf life

4️⃣ Herbal / Natural Preservatives

Plant-based substances with antimicrobial properties.

Common Herbal Preservatives:

  • Neem

  • Turmeric

  • Ginger

  • Clove

  • Cinnamon

  • Tulsi

🌿 Increasing demand due to clean-label & organic products
🌿 Used in traditional dairy products

🧀 II. Utilization of Dairy By-Products

1️⃣ Whey Utilization

Whey is a by-product of cheese, paneer, and chhena manufacture.

Composition of Whey:

  • Lactose (70%)

  • Whey proteins

  • Minerals

  • Vitamins

Uses of Whey:

  • Whey beverages

  • Infant foods

  • Bakery products

  • Sports nutrition (whey protein)

  • Lactose production

  • Animal feed

✅ Reduces pollution
✅ Adds economic value

2️⃣ Utilization of High Acid Milk

High acid milk is unsuitable for drinking but can be utilized safely.

Uses:

  • Paneer and chhena

  • Casein production

  • Acid curd

  • Bakery and confectionery

  • Animal feed

♻️ Prevents wastage
♻️ Converts waste into value-added products

📦 III. Packaging of Milk and Milk Products (Modern Techniques)

Packaging protects milk from:

  • Microorganisms

  • Light

  • Oxygen

  • Physical damage

1️⃣ Traditional Packaging

  • Glass bottles

  • Metal cans

❌ Heavy, breakable, costly

2️⃣ Modern Packaging Materials

🔹 Plastic Packaging

  • LDPE / HDPE pouches

  • Used for liquid milk

  • Lightweight and economical

🔹 Paperboard Cartons

  • Tetra Pak

  • Used for UHT milk

🔹 Laminated Films

  • Multi-layer protection

  • Used for butter, cheese

3️⃣ Advanced Packaging Technologies

🔹 Aseptic Packaging

  • Sterilized product + sterile package

  • Shelf life: 3–6 months (no refrigeration)

🔹 Modified Atmosphere Packaging (MAP)

  • Oxygen replaced with nitrogen/CO₂

  • Used for cheese

🔹 Vacuum Packaging

  • Removes air

  • Prevents oxidation

  • Used for ghee, cheese

🔹 Active & Intelligent Packaging

  • Oxygen absorbers

  • Freshness indicators

  • QR-based traceability

✅ Importance of Modern Packaging

  • Extends shelf life

  • Maintains quality

  • Improves market reach

  • Ensures food safety

  • Supports export requirements

Conclusion

Efficient preservation methods, proper utilization of dairy by-products, and modern packaging technologies play a vital role in:

  • Reducing milk spoilage

  • Increasing profitability

  • Ensuring consumer safety

  • Promoting sustainable dairy industry

    Preservation, By-products & Packaging of Milk:MCQ

    1. Milk is considered highly perishable mainly due to:

    A. High fat content
    B. High water and nutrient content ✅
    C. Low acidity
    D. Presence of minerals

    ✔ Explanation: High moisture and nutrients favor microbial growth.

    2. Chilling of milk should be done at:

    A. 10°C
    B. 7°C
    C. 4°C or below ✅
    D. 0°C

    3. Chilling primarily helps in:

    A. Killing bacteria
    B. Slowing microbial growth ✅
    C. Increasing fat
    D. Removing water

    4. Freezing of milk mainly:

    A. Destroys bacteria
    B. Stops microbial activity ✅
    C. Increases acidity
    D. Improves flavor

    5. Pasteurization of milk aims to:

    A. Sterilize milk completely
    B. Destroy pathogenic organisms ✅
    C. Increase shelf life to months
    D. Remove fat

    6. Drying of milk helps preservation by:

    A. Lowering fat
    B. Removing moisture ✅
    C. Increasing acidity
    D. Killing spores

    7. Which is a physical method of milk preservation?

    A. Sodium benzoate
    B. Lactic acid bacteria
    C. Refrigeration ✅
    D. Turmeric

    8. Chemical preservatives are:

    A. Allowed freely in liquid milk
    B. Banned in dairy products
    C. Regulated by FSSAI ✅
    D. Natural substances only

    9. Which chemical preservative is commonly used in dairy products?

    A. Urea
    B. Sodium benzoate ✅
    C. Formalin
    D. Detergent

    10. Hydrogen peroxide in milk is:

    A. Completely safe
    B. Nutrient enhancer
    C. Restricted and controlled ✅
    D. Naturally present

    11. Biological preservation mainly involves:

    A. Enzymes
    B. Beneficial microorganisms ✅
    C. Chemicals
    D. Heat

    12. Lactic acid bacteria preserve milk by:

    A. Increasing fat
    B. Producing lactic acid ✅
    C. Absorbing oxygen
    D. Removing lactose

    13. Curd preservation works mainly due to:

    A. Salt
    B. Heat
    C. Acid production ✅
    D. Fat content

    14. Which is a fermented milk product?

    A. Milk powder
    B. Butter
    C. Yogurt ✅
    D. Cream

    15. Herbal preservatives are preferred because they are:

    A. Expensive
    B. Artificial
    C. Natural and safe ✅
    D. Highly toxic

    16. Which herb has antimicrobial property?

    A. Neem ✅
    B. Sugar
    C. Salt
    D. Water

    17. Turmeric is used in dairy preservation mainly for:

    A. Color only
    B. Flavor only
    C. Antimicrobial action ✅
    D. Sweetness

    18. Whey is obtained during manufacture of:

    A. Butter
    B. Cheese and paneer ✅
    C. Ice cream
    D. Ghee

    19. Major constituent of whey is:

    A. Fat
    B. Lactose ✅
    C. Casein
    D. Starch

    20. Whey proteins are important because they are:

    A. Low quality
    B. Waste material
    C. Highly nutritious ✅
    D. Indigestible

    21. Whey utilization helps mainly in:

    A. Increasing pollution
    B. Reducing pollution ✅
    C. Spoiling milk
    D. Increasing acidity

    22. Whey is commonly used in:

    A. Infant food ✅
    B. Paint industry
    C. Cement industry
    D. Textile dyeing

    23. Whey beverages are prepared to:

    A. Waste whey
    B. Reduce protein
    C. Utilize nutrients ✅
    D. Increase acidity

    24. High acid milk means milk having:

    A. High fat
    B. High SNF
    C. High acidity ✅
    D. High protein

    25. High acid milk is unsuitable for:

    A. Paneer making
    B. Casein production
    C. Direct consumption ✅
    D. Bakery use

    26. High acid milk can be safely used for:

    A. Drinking milk
    B. Paneer ✅
    C. UHT milk
    D. Toned milk

    27. Utilization of high acid milk helps in:

    A. Increasing spoilage
    B. Preventing wastage ✅
    C. Reducing nutrients
    D. Lowering profits

    28. Packaging of milk mainly protects against:

    A. Gravity
    B. Microorganisms and light ✅
    C. Minerals
    D. Heat only

    29. Traditional milk packaging material was:

    A. Plastic pouch
    B. Tetra pack
    C. Glass bottle ✅
    D. Laminated film

    30. Major disadvantage of glass bottles is:

    A. Cheap
    B. Light weight
    C. Breakable ✅
    D. Flexible

    31. LDPE pouches are mainly used for:

    A. Butter
    B. Liquid milk ✅
    C. Cheese
    D. Ghee

    32. Tetra Pak is mainly used for:

    A. Raw milk
    B. Pasteurized milk
    C. UHT milk ✅
    D. Curd

    33. Aseptic packaging requires:

    A. Refrigeration
    B. Sterile product and package ✅
    C. Freezing
    D. Vacuum only

    34. Shelf life of aseptically packed milk is:

    A. 1–2 days
    B. 1 week
    C. 3–6 months ✅
    D. 1 year frozen

    35. Modified Atmosphere Packaging involves:

    A. Heating
    B. Replacing air with gases ✅
    C. Freezing
    D. Drying

    36. MAP is commonly used for:

    A. Liquid milk
    B. Cheese ✅
    C. Ice cream
    D. Ghee

    37. Vacuum packaging mainly prevents:

    A. Microbial growth only
    B. Oxidation ✅
    C. Protein loss
    D. Lactose breakdown

    38. Active packaging includes:

    A. Glass bottles
    B. Oxygen absorbers ✅
    C. Ice boxes
    D. Milk cans

    39. Intelligent packaging helps in:

    A. Increasing fat
    B. Detecting freshness ✅
    C. Killing bacteria
    D. Cooling milk

    40. QR-based packaging mainly improves:

    A. Color
    B. Taste
    C. Traceability ✅
    **D. Fat %

    41. Which method does NOT preserve milk?

    A. Chilling
    B. Fermentation
    C. Adulteration ✅
    D. Drying

    42. Natural preservatives are gaining popularity due to:

    A. Low demand
    B. Clean-label trend ✅
    C. High toxicity
    D. Artificial nature

    43. Herbal preservatives are mainly:

    A. Synthetic
    B. Chemical
    C. Plant based ✅
    D. Mineral based

    44. Whey disposal without treatment causes:

    A. Soil fertility
    B. Water pollution ✅
    C. Air pollution
    D. Noise pollution

    45. Whey lactose is mainly used for:

    A. Fat production
    B. Sweetener and fermentation ✅
    C. Protein removal
    D. Mineral loss

    46. High acid milk can be used for animal feed because:

    A. It is poisonous
    B. It retains nutrients ✅
    C. It has no protein
    D. It contains toxins

    47. Packaging of milk should be:

    A. Transparent only
    B. Non-protective
    C. Food grade ✅
    D. Reusable always

    48. Modern packaging mainly helps in:

    A. Increasing adulteration
    B. Reducing shelf life
    C. Market expansion ✅
    D. Nutrient destruction

    49. Best preservation method for long-term storage of milk powder is:

    A. Chilling
    B. Drying ✅
    C. Fermentation
    D. Boiling

    50. The main goal of preservation, by-product utilization and packaging is to:

    A. Increase cost
    B. Reduce milk quality
    C. Ensure safety and sustainability ✅
    D. Increase spoilage



Comments

Post a Comment

Popular posts from this blog

Sonali Poultry Farming Project Report: Incubator, Vaccination & Low-Cost Feeding

By Skumar -
Sonali Poultry Farming Project Report: Incubator, Vaccination & Low-Cost Feeding Poultry farming is one of the fastest-growing sectors in agriculture, offering sustainable income opportunities for rural and small-scale farmers. Under the ELM AHDS-485 Poultry Production Course , this project demonstrates a practical and low-cost poultry production model using Sonali crossbreed birds , a mini incubator (100 eggs capacity) , and mess/kitchen waste feeding , supported by a proper vaccination schedule . This model highlights how farmers can reduce costs, improve productivity, and ensure disease control . Introduction to Sonali Crossbreed What is Sonali Crossbreed? Sonali is a dual-purpose poultry bird developed by crossing ** Rhode Island Red chicken males with ** Fayoumi chicken females. It is widely popular due to its adaptability and resemblance to desi chicken. Key Features of Sonali Birds Dual-purpose: Suitable for both meat and egg production Strong disease resistanc...
Read more

Care and Management of Goat Shed for Profitable Goat Farming

By Skumar -
Image
  Care and Management of Goat Shed for Profitable Goat Farming Goat farming is one of the most sustainable and profitable livestock businesses in India. However, success in this field largely depends on how well you design, maintain, and manage your goat shed. A properly managed goat shed ensures better health, higher productivity, disease control, and overall profitability. In this comprehensive guide, we will explore everything you need to know about goat shed care and management—from design and hygiene to feeding and seasonal management. Also Read:  Low-Investment Goat Farming: Profitable Business Guide Importance of Proper Goat Shed Management A goat shed is not just a shelter—it is the foundation of your farm. Poor housing conditions can lead to diseases, stress, low weight gain, and reduced milk production. Key Benefits: Protection from extreme weather conditions Prevention of diseases and infections Improved growth and productivity Better breeding efficiency Reduced mor...
Read more

Chicken Diseases

By Skumar -
  Chicken Diseases (Poultry) Introduction Poultry farming plays an important role in animal husbandry. Diseases in chicken cause heavy economic losses due to mortality, reduced growth, poor egg production and treatment cost. Knowledge of common chicken diseases is essential for students, farmers and competitive examinations. Classification of Chicken Diseases Chicken diseases are broadly classified into: Viral diseases Bacterial diseases Parasitic diseases Fungal diseases Nutritional deficiency diseases 1. Viral Diseases of Chicken 1. Newcastle Disease (Ranikhet Disease) Cause: Virus (Paramyxovirus) Symptoms: Greenish diarrhea Twisting of neck (torticollis) Respiratory distress Sudden death Transmission: Air, feed, water Prevention: Regular vaccination 2. Fowl Pox Cause: Pox virus Symptoms: Wart-like lesions on comb and wattles Reduced feed intake Drop in egg production Prevention: Fowl pox vaccine 3. Infectious Bursal Disease (IBD / Gumboro) Cause: Virus Affected Age: 3–6 ...
Read more

Organic vs Conventional Goat Farming: Which is More Profitable in India?

By Skumar -
Image
  Organic vs Conventional Goat Farming: Which is More Profitable in India? Introduction Goat farming is one of the most profitable and resilient livestock enterprises, especially in India. With rising awareness about health, sustainability, and food safety , farmers and entrepreneurs are now comparing organic goat farming and conventional goat farming to choose the best system. This complete professional blog covers everything—differences, profitability, breeds, government schemes, and expert strategies—to help you make the right decision. Also Read:  Herbal Feed Mix for Goats: Improve Health, Growth & Disease Resistance What is Organic Goat Farming? Organic goat farming is a natural system where goats are raised without synthetic chemicals, antibiotics (except emergency use), or artificial growth promoters. It follows standards set by bodies like Food and Agriculture Organization and certification frameworks such as National Programme for Organic Production . Key Feat...
Read more

Complete Guide to Feeding Goats: Nutrition, Diet Plan & Feeding Tips for Profitable Goat Farming

By Skumar -
Image
Complete Guide to Feeding Goats: Nutrition, Diet Plan & Feeding Tips for Profitable Goat Farming Goat farming is becoming one of the fastest-growing livestock businesses in many parts of the world, especially in rural and semi-urban areas. Goats are known for their adaptability, low maintenance cost, and ability to survive in different climatic conditions. However, the success of goat farming largely depends on proper feeding and nutrition management . Many farmers believe goats can survive by simply grazing on bushes and grass. While goats are natural browsers and can eat a variety of plants, high productivity, faster growth, and better milk production require balanced feeding . Proper feeding not only improves goat health but also increases fertility, strengthens immunity, and ensures better weight gain. Whether you are raising goats for meat, milk, breeding, or small-scale farming, understanding their nutritional requirements is essential. This complete guide explains what go...
Read more

Biosecurity Measures in a Poultry Shed

By Skumar -
Image
  Biosecurity Measures in a Poultry Shed (Complete Guide for Healthy & Profitable Poultry Farming) Introduction Biosecurity in poultry farming refers to all practices that prevent the introduction and spread of infectious diseases within a poultry shed. Diseases can enter a farm through people, vehicles, equipment, feed, water, and even wild birds. Implementing proper biosecurity measures is the most cost-effective way to ensure healthy birds, higher productivity, and better profits . 1. Location and Shed Design Poultry sheds should be located far from residential areas and other poultry farms Choose a well-drained site to prevent water stagnation Maintain sufficient distance between multiple sheds Proper ventilation and sunlight help reduce disease pressure 2. Controlled Entry and Restricted Access Restrict entry of unnecessary visitors Maintain a visitor logbook Use only one entry and exit gate Display biosecurity warning signs at the farm entrance...
Read more