How can inbreeding affect fertility, growth, disease resistance, and survival in livestock?

In the context of animal breeding, inbreeding—the mating of closely related individuals—is generally considered detrimental to livestock health and productivity. While it can be used to concentrate specific desirable traits, it often leads to a phenomenon known as inbreeding depression.12

The negative impacts of inbreeding on livestock include:

• Fertility: Increased inbreeding is associated with reduced fertility in offspring.12
• Growth: Animals often exhibit slower growth rates and decreased physical size.12
• Disease Resistance: Inbred populations typically show a greater susceptibility to disease, often due to the expression of harmful recessive genes that were previously masked.12
• Survival: Higher mortality rates are common, as the overall vigor of the offspring is frequently compromised.12

Because of these risks, producers generally strive to avoid mating related animals. If inbreeding depression becomes evident within a population, the introduction of more diverse genetic material, most commonly through crossbreeding, is required to restore health and vigor.1