Animal Husbandry — Revision Notes

⚡ 30-Second Revision

Animal Husbandry: — Scientific management of livestock (feeding, breeding, disease control).
Dairy Farm Mgmt: — High-yielding breeds, balanced feed, hygiene, disease control.
Poultry Farm Mgmt: — Disease-free breeds, proper housing, nutrition, vaccination.
Inbreeding: — Mating closely related individuals (4-6 generations). Increases homozygosity. Risk of Inbreeding Depression (reduced fertility/productivity).
Outcrossing: — Mating unrelated animals within same breed. Overcomes inbreeding depression.
Cross-breeding: — Mating different breeds. Results in Hybrid Vigour (heterosis). Ex: Hisardale (Bikaneri ewe x Merino ram).
Interspecific Hybridization: — Mating different species. Progeny often sterile. Ex: Mule (male donkey x female horse).
Artificial Insemination (AI): — Semen from superior male artificially introduced to female. Rapid genetic improvement, disease control.
MOET (Multiple Ovulation Embryo Transfer): — Donor cow superovulated with FSH (6-8 eggs), fertilized by AI, embryos transferred to surrogates. Rapid multiplication of superior females.

2-Minute Revision

Animal Husbandry is the scientific care and management of livestock for human benefit, focusing on improving productivity and quality. It encompasses efficient farm management for dairy and poultry, emphasizing hygiene, balanced nutrition, and disease prevention.

A core aspect is animal breeding, which aims to improve genetic traits. Inbreeding, the mating of closely related individuals, increases homozygosity and helps establish pure lines, but can lead to 'inbreeding depression' – a decline in fertility and productivity.

This can be countered by 'outcrossing,' mating unrelated individuals within the same breed. 'Cross-breeding,' involving different breeds, often results in 'hybrid vigour' or heterosis, where offspring are superior to parents (e.

g., Hisardale sheep). 'Interspecific hybridization' involves mating different species, producing sterile offspring like mules. Modern techniques like Artificial Insemination (AI) allow widespread use of superior male genetics, while Multiple Ovulation Embryo Transfer (MOET) uses hormones like FSH to induce superovulation in superior females, enabling them to produce multiple embryos for transfer to surrogate mothers, rapidly expanding superior herds.

5-Minute Revision

Animal Husbandry is the systematic approach to managing domesticated animals for products like milk, eggs, meat, and wool, or for draught purposes. It's a blend of science and practical application, aiming for enhanced productivity and sustainability.

Farm Management:

Dairy Farms: — Focus on high milk yield. Requires selecting high-yielding breeds (e.g., Jersey, Holstein-Friesian), providing clean housing, balanced feed (roughage and concentrates), and strict hygiene during milking. Regular veterinary care and vaccination are crucial for disease prevention (e.g., mastitis).
Poultry Farms: — Aim for egg (layers) or meat (broilers) production. Involves selecting disease-free, high-yielding birds, providing proper housing with adequate space and ventilation, specialized feed, and rigorous disease control through vaccination and sanitation.

Animal Breeding: This is central to genetic improvement.

Inbreeding: — Mating closely related individuals (4-6 generations) within the same breed. Purpose: To increase homozygosity, evolve pure lines, and expose harmful recessive genes for elimination. Risk: Continuous inbreeding leads to Inbreeding Depression (reduced fertility and productivity).
Outbreeding: — Mating unrelated animals.

* Outcrossing: Mating animals within the same breed but with no common ancestors for 4-6 generations. Purpose: To overcome inbreeding depression and improve productivity in below-average animals.

* Cross-breeding: Mating two different breeds. Purpose: To combine desirable traits from both parents. Progeny often show Hybrid Vigour (Heterosis), being superior to parents. Example: Hisardale sheep (Bikaneri ewes x Merino rams).

* Interspecific Hybridization: Mating two different species. Purpose: To combine desirable traits. Outcome: Progeny (hybrids) are often sterile. Example: Mule (male donkey x female horse).

Assisted Reproductive Technologies:

Artificial Insemination (AI): — Semen from a superior male is collected and artificially introduced into the female's reproductive tract. Advantages: Widespread use of superior genetics, eliminates need for breeding males on every farm, controls venereal diseases, allows use of stored semen.
Multiple Ovulation Embryo Transfer (MOET): — For rapid multiplication of superior females. Steps:

1. Donor cow (high genetic merit) is administered FSH to induce superovulation (produces 6-8 eggs). 2. Eggs are fertilized by AI. 3. Embryos (8-32 cell stage) are non-surgically recovered. 4. Embryos are transferred to surrogate mothers. This allows a superior female to produce many offspring in a short time.

Key Takeaway: Animal husbandry is a scientific endeavor to enhance livestock productivity, ensuring food security and economic benefits through careful management, genetic improvement, and advanced reproductive techniques.

Prelims Revision Notes

Animal Husbandry is the scientific management of livestock, covering feeding, breeding, and disease control. Its goal is to improve the quality and productivity of animals for human benefit.

Farm Management:

Dairy Farm: — Focus on milk yield. Key aspects: selection of high-yielding breeds (e.g., Jersey, Holstein-Friesian), proper housing, balanced feed (roughage and concentrates), strict hygiene, regular veterinary check-ups, and vaccination for disease prevention (e.g., mastitis).
Poultry Farm: — Focus on egg (layers) and meat (broilers) production. Key aspects: selection of disease-free, high-yielding breeds (e.g., Leghorn for eggs), appropriate housing with ventilation, specialized feed, and rigorous sanitation and vaccination programs to prevent highly contagious diseases.

Animal Breeding:

Inbreeding: — Mating closely related individuals (4-6 generations) within the same breed. Increases homozygosity. Used to evolve pure lines. Risk: Inbreeding depression (reduced fertility and productivity).
Outbreeding: — Mating unrelated animals.

* Outcrossing: Mating animals within the same breed but with no common ancestors for 4-6 generations. Used to overcome inbreeding depression. * Cross-breeding: Mating two different breeds. Combines desirable traits. Leads to Hybrid Vigour (Heterosis). Example: Hisardale sheep (Bikaneri ewes x Merino rams). * Interspecific Hybridization: Mating two different species. Progeny often sterile. Example: Mule (male donkey x female horse).

Assisted Reproductive Technologies:

Artificial Insemination (AI): — Semen from a superior male is collected and artificially introduced into the female. Advantages: rapid genetic improvement, reduced disease transmission, use of semen from distant/deceased males.
Multiple Ovulation Embryo Transfer (MOET): — For rapid multiplication of superior females. Steps: 1. Donor cow is administered FSH to induce superovulation (6-8 eggs). 2. Eggs are fertilized by AI. 3. Embryos (8-32 cell stage) are recovered. 4. Embryos are transferred to surrogate mothers. This technique allows a high genetic merit female to produce multiple offspring in a short period.

Vyyuha Quick Recall

How Interesting Cows Often Mate Artificially!

Hisardale (Cross-breed example)
Inbreeding (Closely related)
Cross-breeding (Different breeds)
Outcrossing (Unrelated, same breed)
MOET (Multiple Ovulation Embryo Transfer)
AI (Artificial Insemination)