twelve - Crossbreeding ANS 3384 Crossbreeding is the...

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Unformatted text preview: Crossbreeding ANS 3384 Crossbreeding is the Opposite of Inbreeding • While inbreeding results in a lower proportion of heterozygous loci, crossbreeding increases the frequency of heterozygous loci. • While inbreeding lowers performance for many traits, especially lowly heritable traits, crossbreeding increases performance for these same traits Letter to Editor by Vet Student “…also talks about how crossbred dogs have hybrid vigor. It is true that animals that have received their genes from a variety of breeds tend to be more resistant to the health problems commonly seen in purebreds. However, hybrid vigor is not derived from the mating of one breed to another (actually, that would most likely result in a dog that has the problems typically seen in each of the parent breeds). It results from mating many crossbreds over a long period of time. “ (Name withheld out of courtesy) Heterosis • Heterosis is also known as “hybrid vigor” • Heterosis is the improvement in performance of crossbred animals over the average performance of the purebred breeds used in the cross • Heterosis = (Crossbred Mean – Purebred Mean)/ Purebred Mean X 100% Heterosis Example • Brahman Purebred Calves weigh 450 lbs • Angus Purebred Calves weigh 430 lbs • Calves from Brahman Bulls and Angus Cows weigh 470 lbs • Calves from Angus Bulls and Brahman Cows weigh 490 lbs • Heterosis = (480 – 440)/440 X 100 = 40/440 X 100 = 9.09% Crossbreeding Systems • Single Cross • Uses only two breeds or strains • One, the male side is often referred to as the Terminal Cross Sire Line • Terminal Cross Lines are selected for...
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twelve - Crossbreeding ANS 3384 Crossbreeding is the...

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