Selection for broiler dam line pullets: Mass selection

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

The records of 1663 birds (progenies of 40 sires) of synthetic meat line were used for this study. 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 at 20 weeks of age (BW20), age at first egg (AFE), egg production upto 40 weeks of age (EP40) and egg weight at 32 weeks of age (EW32). The data were analysed by using Harvey’s mixed model least squares technique. The expected direct and correlated response in traits was calculated assuming selection intensity as 1.40. Selection for 5 /-N would cause reduction in EP40 and BW 20 and delay in AFE but increase in BW6 and EW32. On account of selection for high IAP or GPT there would be decline in BW6, EP40, and EW32 and delay in AFE. Selection of pullets for BW6 would improve all the performance traits in desired direction except marginal delay in AFE. Selection on the basis of BW20 would improve all the performance traits in desirable direction. Selection on the basis of AFE would improve EP40 but adversely affect BW6 and EW32. Selection for higher EP40 would improve all the performance traits but reduce EW32. Selection on the basis of EW32 would improve BW6, BW20, delay in AFE and decline in EP40. Therefore, early selection may be based on BW6 followed by BW20 and AFE and finally on EP40 to improve BW6, EW32 and EP40.

Source : IPSACON-2005

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