Question

Calculate the genetic gain for milk solids (MS) per generation in a herd of dairy cattle, in which the phenotypic variance is 0.36 kg2, the genetic variance is 0.18 kg2, and when 0.1% of the best bulls (i male 3.4) and 20 % of the best cows (i female= 1.4) are selected for breeding replacements. C1. (10 marks)

Answer 1

Genetic Variation is caleutata by formula folloueng Xy phenotypic vaiakon x 1/L AG CGenetic gain) -henstebility where mtenaity proporton of produce next Selection I = Population selected to generatin ength of ycle inter val L usually aenerakin) L1 phenotypic variaheon -o.36K2 Sence differant proportions of mala and eecled, therefore Bermale aree emale la imale t 3.4 +- 4 3.4 +0.7 4. 1 4- 0.13Kg penekic gain 4-1 = 0-18 X 0.36 X 1 0. 26568 (1enepic gan O 26568