What is the primary goal of animal breeding?

The primary goal of animal breeding is to genetically improve livestock populations to enhance their productivity, efficiency, and the quality of their products. This includes increasing milk yield, growth rate, egg production, and wool quality, as well as improving traits like disease resistance, fertility, feed conversion efficiency, and adaptability to various environmental conditions. Ultimately, it aims to make animal husbandry more sustainable and beneficial for human needs.

Explain 'inbreeding depression' and why it occurs.

Inbreeding depression is a reduction in fitness, vigor, fertility, and productivity that occurs in offspring due to continuous inbreeding. It happens because inbreeding increases homozygosity, meaning there's a higher chance for deleterious recessive alleles (genes that cause harmful traits) to become homozygous and express themselves. While inbreeding helps 'fix' desirable traits, it also unmasks these harmful recessive genes, leading to a decline in the overall health and performance of the inbred population.

How does Artificial Insemination (AI) benefit animal breeding?

Artificial Insemination (AI) offers several significant benefits. It allows a single superior male to sire a large number of offspring, thus rapidly spreading desirable genes throughout a population. AI reduces the risk of transmitting venereal diseases between animals. It eliminates the need for maintaining expensive and sometimes dangerous breeding males on every farm. Furthermore, it facilitates breeding between animals across vast geographical distances and aids in the preservation of germplasm from valuable or endangered breeds.

What is 'hybrid vigor' or 'heterosis' in the context of cross-breeding?

Hybrid vigor, also known as heterosis, refers to the phenomenon where the offspring resulting from a cross between two genetically distinct parents (e.g., different breeds) exhibit superior traits compared to the average of their parents, or even surpass both parents. This superiority can manifest in terms of increased growth rate, higher yield, improved fertility, or enhanced disease resistance. It is believed to be due to increased heterozygosity, which masks deleterious recessive alleles and allows for the expression of favorable dominant alleles from both parents.

What is the significance of MOET (Multiple Ovulation Embryo Transfer) in modern animal breeding?

MOET is a revolutionary technique that significantly accelerates genetic improvement in livestock. By inducing superovulation in a genetically superior female, it allows her to produce multiple eggs (typically 6-8) per cycle instead of just one. These eggs are then fertilized and the resulting embryos are transferred to surrogate mothers. This means a single elite female can produce many offspring in a short period, dramatically increasing her reproductive contribution and speeding up the propagation of her superior genetics within a herd or population.

Can you give an example of a successful cross-breed and its parent breeds?

A classic example of a successful cross-breed is 'Hisardale,' a new breed of sheep developed in Punjab, India. It was created by crossing Bikaneri ewes (females) with Merino rams (males). The objective was to combine the hardiness and adaptability of the Bikaneri sheep with the superior fine wool quality of the Merino sheep, resulting in an improved breed that excels in both aspects and is well-suited to local conditions.

Animal Breeding

Biology

NEET UG

Version 1Updated 22 Mar 2026

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Animal breeding is a branch of animal science that involves the selective mating of animals to improve desirable genetic traits in the offspring. The primary objective is to enhance productivity, such as increased milk yield in dairy cattle, faster growth rate in poultry, or improved wool quality in sheep, while also focusing on disease resistance, adaptability to various environmental conditions,…

Quick Summary

Animal breeding is the strategic process of mating selected animals to improve their genetic traits for enhanced productivity and quality. It's a cornerstone of animal husbandry, aiming for higher yields (milk, eggs, meat), better product quality, and increased disease resistance and adaptability.

Key methods include inbreeding, which involves mating closely related individuals to increase homozygosity and 'fix' desirable traits, but carries the risk of 'inbreeding depression' (reduced vigor due to harmful recessive genes).

Outbreeding, conversely, involves mating unrelated animals to introduce genetic diversity and overcome inbreeding depression. Outcrossing is within the same breed but unrelated individuals, cross-breeding involves two different breeds (e.

g., Hisardale sheep from Bikaneri and Merino), and interspecific hybridization involves two different species (e.g., mule from horse and donkey), often resulting in sterile offspring. Modern techniques like Artificial Insemination (AI) allow widespread use of superior male genetics, while Multiple Ovulation Embryo Transfer (MOET) dramatically increases the reproductive output of superior females, both accelerating genetic improvement.

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Key Concepts

Inbreeding and Inbreeding Depression

Inbreeding is a mating strategy where closely related individuals within the same breed are bred together.…

Cross-breeding and Hybrid Vigor

Cross-breeding involves mating two different breeds of animals. The main objective is to combine the…

Multiple Ovulation Embryo Transfer (MOET)

MOET is an advanced reproductive technology designed to rapidly multiply the number of offspring from a…

Animal Breeding: — Selective mating for genetic improvement.

Inbreeding: — Mating closely related individuals.

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Increases homozygosity, fixes traits, risk of Inbreeding Depression (reduced vigor).

Outbreeding: — Mating unrelated individuals.

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Increases heterozygosity, overcomes inbreeding depression, often leads to Hybrid Vigor.

Outcrossing: — Mating unrelated individuals within the same breed. Best for improving below-average animals.

Cross-breeding: — Mating two different breeds. E.g., Hisardale (Bikaneri ewe x Merino ram).

Interspecific Hybridization: — Mating two different species. E.g., Mule (male donkey x female horse), usually sterile.

Artificial Insemination (AI): — Semen from superior male artificially introduced to female. Benefits: widespread use of superior genetics, disease control.

Multiple Ovulation Embryo Transfer (MOET): — Hormonal treatment (FSH) for superovulation (6-8 eggs), fertilization, embryo transfer to surrogates. Benefits: rapid multiplication of superior females' offspring.

To remember the types of outbreeding and their examples, think of: Out Cross In Hisardale Mule.

Outcrossing: Outside the family, Close to the breed.

Cross-breeding: Combining breeds. Hisardale is the example.

Interspecific Hybridization: Inter-species. Mule is the example.