# hwchp10 - Name Homework 6 Chapter 10 ANSC 3500 Animal...

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Name___________________________ Homework 6, Chapter 10 ANSC 3500 – Animal Breeding Due Tuesday, March 4, 2014 1. Given the phenotypic standard deviation (SDP) and heritability for the following traits, what is the standard deviation for breeding value (SDBV)? If breeding value were estimated from an individual’s own performance for one trait, what would be the accuracy of selection? Species Trait SDP Heritability SDBV Accuracy Beef Mature weight 80 lb .60 ______ ________ Dairy Milk Fat % 0.5% .50 ______ ________ Horse One mile trot 3.5 sec .45 ______ ________ Chicken No. eggs in 1 year 15 eggs .15 ______ ________ Swine No. pigs weaned 2.5 pigs` .12 ______ ________ Sheep Weaning weight 5 lb .30 ______ ________ 2. What is the expected rate of genetic gain for weaning weight in a beef cattle herd with the following characteristics and selection policies? Assume the phenotypic standard deviation for weaning weight is 40 lb and heritability is .30. Recall that for phenotypic selection, accuracy is the square root of heritability. Animals will be selected based on their own weaning weight with adjustments for age of dam and contemporary group.

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• Spring '13
• Kuhlers
• Vice President of the United States, Artificial selection, bulls, Phenotypic standard deviation

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