ADSC 3600 Lecture Notes - Lecture 10: Anasarca, Shorthorn, Heterosis
17 Feb 2017
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*he will give out a handout after the test on these disorders. Not a killer gene, but you don"t want it. Breed carriers and will show a recessive trait: bb and bb will give us one red bb. If a carrier bull gets bred to your cows (bb and bb: about half of your heifers will be carriers. Carrier bull used on all normal cows, with normal bulls breed in next generations. Over time, if we don"t breed the carrier breed, then we will lose the gene. Both parents have to be carriers to produce an affected calf. Therefore, you should buy bulls that aren"t carriers. Crossbreeding reduces the chances of recessives lethals. If genetic (dna) testing is available for known defects. Expense vs outcome: low cows- no affected calves born, moderate cost sires, cows, and replacement heifers based on pedigree, highest cost all animals in the herd. If you have a positive carrier of a gene defect:
