the total variance of 180-day body weight in a population of swine is 250 pounds. the variance due to dominance effects is 50 pounds. the variance due to epistatic effects is 20 pounds. The environmental variance is 350 pounds. what is the heritability estimate of this trait?
1. The mean adult weight of your pig population is 720 lbs. P1 is an outstanding pig and has an adult weight of 650 lbs. After carrying out matings between P1 with any sows from your population, you obtained a new population (i.e. progeny of P1). The mean adult weight of the progeny population is only 780 lbs.
a. What is your estimate of P1’s breeding value?
b. Assuming there is no dominance or epistasis at the loci that influence adult weight, calculate P1’s genotypic value (G), environmental effect (E), and gene combination value (GCV)
2. You measure the body weight of a cattle population. The variance of body weight is 50 lbs^2 and the variance caused by permanent environmental effect is 10 lbs^2 . The correlation coefficient between body weight and breeding value is 0.4. The repeatability of body weight is 0.8.
a. What is the narrow-sense heritability h^2?
b. What is the variance of breeding values?
c. What is the variance of gene combination values?
