Selection for broiler dam line cockerels: Mass selection

C.P.Malik, D.S.Dalal, Z.S. Malik and Sunil Kalra
Department of Animal Breeding, CCS Haryana Agricultural University
Hisar-125004 (Haryana)

This study was conducted on 696 birds (progenies of 40 sires) of synthetic meat line and selected on the basis of mass selection. The blood biochemical traits recorded were 5 /-nucleotidase (5 /-N), intestinal alkaline phosphatase (IAP) and glutamate pyruvate transaminase (GPT) enzymes at 6 weeks of age and performance traits were body weight at 6 weeks of age (BW6) and breast angle at 6 weeks of age (BA). The data were analysed by using Harvey’s mixed model least squares technique. The genetic and phenotypic parameters were estimated by paternal half-sib correlation method. The expected direct and correlated response through individual trait selection was calculated assuming selection intensity as 1.75. Through the application of this selection procedure, the correlated response in BW6 would be expected as 15.96g, 12.84g, 2.97g and 23.88g from selection on the basis of 5 /-N, IAP, GPT and BA, respectively. Selection of cockerels for BW6 would give direct response in this trait as 29.26g and correlated response in BA as 1.008 cm. The study indicated that BW6 in cockerels can be improved through mass selection for 5 /-N, IAP, GPT, BA and BW6.

Source : IPSACON-2005

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