Flashcards in CAL: Genetic Improvement Deck (6)
What is the difference between genetic improvements and feeding/health changes impleemeneted on farm?
Genetic improvement cumulative over time, feedig and health changes not cumulative
How can the levle of genetic prgress of a herd of given size be predicted?
R = S x h^2
R = i x h^2 x SDp
R = response
s = selection diffferential
h^2 = heritability of the trait
i = selectino intensity
SDp = std deviation of the pphenotype (sqrt of variance)
Which aspect of genetic progress response equation can a breeder influence?
i (intensity of selecction pressure) by choosing proportion of gene pool picked to breed (ie top 10 vs top 100 animals)
How can R be converted to an annual response?
R = per generation [= time mbetween same point in life cycle of offspring to parent]
to calculate annual response deivide R by generation interval
how is amount of inbreeding calculateed?
delata F = 1/ (2*Ne*L)
delta F = annual ^ in inbreeding
Ne = 4*s*d (where s and d are no. new sires and dams in a year)
L = generation interval