Genes. Located on chromosomes Thousands found in each animal Control inherited characteristics Carcass traits Growth rate Feed efficiency Two types of inherited traits Dominant Recessive. Genes. Dominant gene Hides the effect of another gene Polled condition in cattle is dominant
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The dominant gene is written- P
The recessive gene is written-p
N= Normal size
N= Normal size
Result: one out of every four births could result in a dwarf animal (1:2:1)
Black = 100%
Polled = 100%
Horned = 0%
Complete a Punnett Square for two animals that are heterozygous for two traits:
(Alternatives are horned and red)
Black is dominant (B), and red is recessive (b). "Predict the offspring from the cross of a red bull and a black cow if the black cow's mother was red".
First things first: the only way for the red bull to be red (the recessive trait) is if it's genotype is homozygous recessive (2 little letters), so the red bull is "bb". Now, the black cow's genotype could be either "BB" or "Bb". If its mommy was red (bb), then this black cow MUST have inherited a little "b" from its mommy. So the black one in our cross is "Bb" (not "BB"), and our cattle cross is: Bb x bb.
Heritability Estimates - cattle
Rib Eye Area 70
Heritability Estimates - Swine
Weaning Wight (3 wks)15
Heritability Estimates - Sheep
Weaning Wight 30
Carcass (percent lean)35