Course Content
UNIT 1 – INTRODUCTION TO DAIRY CATTLE PRODUCTION
After successful completion of unit one, students will able to:  Define and use correctly key terminologies related to dairy production and the dairy industry.  Describe the role of dairy production in the world economy and identify major features of the dairy industry.  Discuss the potentials and constraints of dairy production and development in Ethiopia, showing an appreciation for its socio-economic impact.  Classify and compare different dairy cattle production systems found in the tropics.  Explain and evaluate the advantages and disadvantages of keeping dairy cattle under various production systems.
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Unit objectives
1.1. Overview of Dairy Production in the World Economy
1.2. Features of the Dairy Industry
1.3. Dairy Production and Development in Ethiopia: Potential and Constraints
1.4. Dairy Cattle Production Systems
1.5. Advantages and Disadvantages of Dairy Farming
Activity 1: Group Discussion Questions
UNIT 2 – BREEDS OF DAIRY CATTLE AND DISTRIBUTION
In unit two, you will be introduced to the diversity of dairy cattle breeds and their distribution, with a focus on both exotic and indigenous breeds. You will begin by exploring the fundamental reasons why animals, particularly cattle, differ from one another, examining distinctive characteristics such as body conformation, fitness traits related to adaptability and disease resistance, and production traits tied to milk yield and quality. This foundational understanding will then guide you into the classification of dairy cattle breeds into local (Bos indicus) and exotic (Bos taurus) types, highlighting how their unique features determine their suitability to various environments and management systems. Following this, you will delve into detailed profiles of the most well-known exotic dairy cattle breeds, including Holstein Friesian, Ayrshire, Jersey, Guernsey, and Brown Swiss, learning about their origins, physical features, milk production capacities, and adaptability. You will also examine these breeds through illustrative figures that help visualize their typical appearances. The unit will then shift to the rich diversity of Ethiopian indigenous dairy cattle breeds, such as Barca, Arsi, Fogera, Boran, Horro, Ogaden, Sheko, and Senga. You will learn how these breeds have evolved under local conditions to provide milk, meat, and draft power, while maintaining resilience to Ethiopia’s varied climates and disease challenges. Pictures included throughout will help you recognize these breeds in practice. By the end of this unit, you will not only have a clear appreciation of the breeds commonly used for dairy production both globally and in Ethiopia, but also understand why the right breed choice matters for achieving sustainable dairy development under different production systems.
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Introduction
Unit Objectives
Self-Assessment Question 1
2.1. Breeds of Dairy Cattle
2.2. Exotic Dairy Cattle Breeds
2.2.1. Holstein Friesian
2.2.2. Ayrshire
2.2.3. Jersey
2.2.4. Guernsey
2.2.5. Brown Swiss
2.3. Indigenous Cattle breeds
2.3.1. Barca
2.3.2. Arsi
2.3.3. Fogera
2.3.4. Borana
2.3.5 Horro
2.3.6 Ogaden
2.3.7 Sheko
2.3.8. Senga
Summary of Unit 2
Group Discussion Questions
UNIT 3 – DAIRY CATTLE HOUSING AND MANAGEMENT
In unit three, students will acquaint themselves with the dairy cattle housing importance, types of dairy cattle houses, and management of dairy cattle at different physiological stages. The importance of dairy cattle houses and types of dairy houses will be covered in the first section of the unit. Next to this section, students will learn about the management of different groups of animals in dairy cattle production.
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Objectives
3.1. The importance of Dairy Cattle housing
3.2. Site Selection & Farm Layout for Dairy Cattle Housing
Activity: Visit a nearby dairy farm house
3.3. Types of Housing and Housing Equipment
3.3.1. Loose house system
3.3.2. Conventional dairy barn
3.3.2.1. Dairy Cattle Housing Orientation
3.3.2.2.The advantages of arrangement
3.4. Dairy Cattle Management
3.4.1 Pregnant Cows
3.4.2. Lactating Cow
3.4.3. Dry Cow
3.4.4. Calves
3.4.5. Heifers
3.4.6. Breeding Bulls
Unit Summary
Self-Assessment Questions
Further Reading
UNIT 4 – REPRODUCTION AND BREEDING OF DAIRY CATTLE
In unit four, you will explore the vital biological and management aspects that underpin the reproductive efficiency and genetic improvement of dairy herds. You will understand the reproductive system of dairy cattle and the dynamics of the oestrus cycle, which are essential for making informed breeding decisions and ensuring high conception rates. You will also examine how to select appropriate dairy breeds, discuss key economically important traits that influence milk production and herd profitability, and study various selection methods that help achieve desirable genetic progress. Additionally, you will learn about the different methods of impregnation, including natural mating using bulls and the widespread use of artificial insemination (AI), which plays a critical role in modern dairy herd management. By the end of this chapter, you will appreciate how reproduction and breeding practices contribute to herd productivity, animal welfare, and the overall success of dairy enterprises. This knowledge will be fundamental for designing effective breeding programs, improving herd genetics, and supporting sustainable dairy production.
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Unit 4. Introduction
OBJECTIVES
4.1. Reproductive System of Dairy Cattle
4.1.1. Female Reproductive System
4.1.2. Male Reproductive System
4.2. The Oestrus Cycle of the Cow
4.3. Selection of Dairy Cattle Breeds
4.3.1. Selection methods of dairy animals
4.3.2. Economically important traits
4.4. Methods of Impregnation
4.4.1. Artificial Insemination (A.I.)
4.4.2. Natural Service
SUMMARY
Activity 4: Group 1
Activity 4: Group 2
Activity 4: Group 3
Activity 4: Group 4
Activity 4: Group 5
Self-Assessment Question 4.
Self-Assessment Question - II
FURTHER READING MATERIALS
UNIT 5 – FEEDS AND FEEDING OF DAIRY CATTLE
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Unit 5. Introduction
Unit 5 Objectives
5.1. Digestive System of Dairy Cattle
5.1.1. Ruminants and their stomach
5.1.2. Gastrointestinal Tract Adaptations
5.1.3. Structure and Function of the Stomach
5.1.4. Development of the Stomach
5.2. Rumination Process
5.3. Feed Resources of Dairy Cattle
5.3.1. Natural Pasture
5.3.2. Crop Resides
5.3.3. Agro-industrial Byproducts
5.3.4. Cultivated Forages
5.3.5. Non-conventional Feeds
5.4. Feeding Dairy Cattle
5.4.1. Feeding According to Stage
5.4.2. Practical Considerations
5.4.3. Nutrient Requirement of Dairy Cattle
5.4.4. Ration formulation for dairy cattle
5.4.5. Feeding strategies of dairy cattle
5.5. Feeding related problems in dairy cattle
Summary
Activity 5: Group Discussion Questions
Self-Assessment Question (True or Flase)
Self-Assessment Question (Explain in brief)
Self-Assessment Question (Fill in the blank space)
Further Reading Materials
UNIT 6 – ANATOMY AND PHYSIOLOGY OF LACTATION
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Unit Introduction
Unit Objectives
6.1. Mammary Gland Development
6.2. Embryonic and Fetal Development
6.3. Development from Birth to Puberty
6.4. Developments of Pregnancy
6.5. Lactogenesis
6.6. Milk Synthesis and Secretion
6.7. Milk Let Down and Hormonal Regulation
6.8. Factors Affecting Milk Yield and Milk Composition
6.8.1. Genetic Factor
6.8.2. Environmental Factor
Unit Summary
Self-Assessment Questions (Fill in the blank space)
Self-Assessment Questions (explain briefly)
Further reading Materials
UNIT 7 – DAIRY HERD HEALTH CARE
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Unit Introduction
Unit Objectives
7.1. Disease Prevention and Health Control: Regular Observation
7.2. Forms and Causes of Diseases
7.3. Common Dairy Cow Diseases and Disorders
7.3.1. Internal Diseases
7.3.2. External Parasites
7.4. Disposal of a Dead Animal
7.4.1. Common Methods of Disposal
7.4.2. Important Considerations
7.5. Dairy Cattle Welfare and Handling
7.5.1. Importance of Dairy Cattle Welfare
7.5.2. Proper Handling Techniques
7.5.3. Key Aspects of Dairy Cattle Welfare
Unit Summary
Self-Assessment Questions (Tre/False)
Self-Assessment Question (Choise)
Self-Assessment Questions (fill in the blank)
Further reading Materials
UNIT 8 – IDENTIFICATION AND RECORD KEEPING
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Unit Introduction
Unit Objectives
8.1. Purpose and Benefits of Records Keeping
8.2. Identification Methods
8.3. Dairy Herd Recording and Management
Unit Summary
Self-Assessment Questions (Fill in the blank space)
Self-Assessment Questions (Provide short answer)
FURTHER READING MATERIAL
UNIT 9 – SUSTAINABLE DAIRY PRODUCTION AND ENVIRONMENT
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Unit Introduction
Unit Objectives
9.1. Greenhouse Gas Emissions from Dairy Cattle Production
9.2. Methods for Calculating Emissions from Livestock
9.2.1. Direct Methods
9.2.2. Indirect Methods
9.3. Methods of Reducing Greenhouse Gas Emission
9.4. Sustainability and Resilience of the Dairy Sector in Changing World
Unit Summary
Self-Assessment Questions (Choise)
Self-Assessment Questions (Explain briefly)
Further Reading Materials
Dairy Cattle Production and Management

6.1. Mammary Gland Development

Mammary gland is the milk-secreting gland in female animals post-partum, although some species produce milk peripartum. The mammary gland is a defining feature of mammals. Mammary gland development commences embryonically and continues post-natal even during lactation. The mammary gland begins developing in utero at approximately 30 d gestation in dairy cattle.

At birth, calves have an udder consisting of basic internal structures, such as small ducts and a mammary fat pad, and fully developed outer structures, such as teats. Before weaning, the rudimentary ducts will form major ducts and the mass of the mammary parenchyma and mammary fat pad increase, although there is little to no lobuloalveolar development.

The study of the mammary gland is important to understand the physiological mechanisms involved during its growth and development, during its functional activity, and to control some pathologies and external factors that can affect its secretory capacity.

Histologically, the mammary gland is a tubule alveolar gland of ectodermal origin, a modified apocrine sweat gland that is found in both sexes but only completes its full development in the female. In the case of the cow, it is called the udder.

Externally, the udder is a set of four functional glands gathered in a single mass, it has a parallelepiped or saccular shape, and it is located in the inguinal region, suspended by the medial and lateral suspensory ligaments. It is divided into two symmetrical lateral halves by a sagittal furrow called the mammary groove, each of these halves is divided in turn, into two anterior and posterior quarters, although this separation in some cases is not very evident. Each quarter is projected inferiorly by a cylindrical protrusion called the nipple (Figure 5).

The udder is covered with short, smooth, and sparse hair, except on the nipples. The rear quarters are generally of greater capacity than the front quarters. In the specific case of the dairy cow, the udder must be wide, located between the hind legs, and long, extending from the floor of the belly in the umbilical region (anterior insertion) to the perineal region (posterior insertion), also it must have a moderate depth that is determined by the support provided by the firm and elastic suspensory ligaments called the medial and two lateral ligaments.

The internal structure of the udder is composed of secretory parenchyma and a connective tissue stroma.

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