EBK CONCEPTS OF GENETICS
12th Edition
ISBN: 9780134818979
Author: Killian
Publisher: YUZU
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Chapter 25, Problem 15PDQ
Summary Introduction
To determine: The effect on milk protein content in the next generation when the farmer selects cows producing more butterfat in their milk in the given problem.
Introduction: The contribution of genotypic variance to the total
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In a herd of dairy cows the narrow-sense heritability for milk protein content is 0.76, and for milk butterfat it is 0.82. The correlation coefficient between milk protein content and butterfat is 0.91. If the farmer selects for cows producing more butterfat in their milk, what will be the most likely effect on milk protein content in the next generation?
You estimate the heritability of milk production in the brown cows at your friend’s farm. The heritability is H2=0.45. Identify the following that best describes the conclusions you can make from your study.
a.
Cows that produce milk at lower rates than at your friend’s farm occurs because they have bad genes.
b.
Cow milk production in this population is dependent on both environmental and genetic influence.
c.
Milk production is not heritable in your friend’s population of cows.
d.
Milk production heritability at the farm 15 miles down the road is also likely to be 0.45.
Three characteristics in beef cattle—body weight, fat content, and tenderness—are measured, and the following variance components are estimated: Body weight Fat content Tenderness VA 22 45 12 VD 10 25 5 VI 3 8 2 VE 42 64 8 VGE 0 0 1 In this population, which characteristic would respond best to selection? Explain your reasoning.
Chapter 25 Solutions
EBK CONCEPTS OF GENETICS
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