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A swine breeder is selecting for an increased number of pigs weaned (NW) and reduced backfat (BF) in her pigs. She plans to choose three out of the following eight boars based on EBVs for these traits: Boar | EBV for Number of Pigs Weaned | EBV for Backfat (inches) Which boars would she initially select using tandem selection when NW is the first trait under selection? Which boars would she initially select using tandem selection when BF is the first trait under selection? Which boars would she select using independent culling levels if the levels were 0.20 pigs for NW and 0.10 inch for BF? Which boars would she select using economic selection index, where an independent one pig increase in NW is worth $100.00 and an independent 1-inch difference decrease in BF is worth $1,000.00? Why would a boar be selected with the index (d) but not with independent culling levels?
Adi S.
A pig breeder wants to select for two traits: Weight and Feed Intake. They have decided that they wish to increase weight while reducing feed intake. Both traits have the same heritability (0.3) and the same phenotypic standard deviation (2 units). The genetic correlation is 0.40 and the phenotypic correlation is 0.30. The breeder has calculated the economic value of the two traits as +2 for weight and -0.5 for feed intake. A selection index based on its own performance is calculated and used to predict the response to selection in one generation, which is 1.05 kg for weight and 0.25 kg for feed intake. The breeder has asked a series of questions regarding the results. A. What is a selection index used for in animal breeding? B. What is the difference between economic values and predicted response? C. Are the economic weights appropriate for the breeder's goal? Explain why the response to feed intake is positive. D. Explain how an index could be designed such that there was no response for feed intake.
An animal breeder can buy four types of food for Vietnamese pot-bellied pigs. Each case of Brand A contains 25 units of fiber, 40 units of protein, and 40 units of fat. Each case of Brand B contains 50 units of fiber, 40 units of protein, and 40 units of fat. Each case of Brand C contains 75 units of fiber, 40 units of protein, and 50 units of fat. Each case of Brand D contains 150 units of fiber, 120 units of protein, and 110 units of fat. How many cases of each brand should the breeder mix together to obtain a food that provides 1350 units of fiber, 920 units of protein, and 1000 units of fat? Let x represent the number of cases of Brand A, y represent the number of cases of Brand B, z represent the number of cases of Brand C, and w represent the number of cases of Brand D. There are four ways in which the breeder can mix brands to obtain a food that provides 1350 units of fiber, 920 units of protein, and 1000 units of fat. If w=0, the solution is (_, _, _, 0). If w=1, the solution is (_, _, _, _). If w=2, the solution is (_, _, _, _).
Madhur L.
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