Genetic evaluation of the performance of Japanese quails

M.S. Feroz Mohammed, B. Ramesh Gupta, G. Narasimha Rao and A. Rajasekhar Reddy
Department of Animal Genetics and Breeding
College of Veterinary Science, Rajendranagar, Hyderabad 500 030, Andhra Pradesh

The data on 2926 Black and Brown Japanese quails (Coturnix coturnix japonica) selected for high 6-week body weight for two generations were analyzed to study the genetic variation in body weights and Average Daily Gain. The overall least squares mean body weights at hatch, 1, 2, 3, 4, 5 and 6 weeks age were 8.19±0.01, 28.60±0.09, 62.17±0.18, 102.49±0.27, 133.34±0.32, 163.84±0.37 and 190.67±0.39 g, respectively. The effects of strains, generations and hatches were significant (P<0.01) at all the ages, while the influence of sex was significant on body weights from 1 to 6 weeks age. The overall mean weight gains during hatch to 1, 1 to 2, 2 to 3, 3 to 4, 4 to 5 and 5 to 6 weeks age were 20.41, 33.57, 40.32, 30.85, 30.50 and 26.83 g, respectively. The effect of generations, sexes and hatches were significant on the ADG at all the ages studied, while strains had significant influence on ADG during 1, 2, 4 and 5 weeks age only. The overall least squares means of ADG during 1, 2, 3, 4, 5 and 6 weeks age were 2.92±0.01, 4.78±0.02, 5.76±0.03, 4.40±0.03, 4.35±0.03 and 3.83±0.03 g, respectively.

The estimates of heritability in Black and Brown strains ranged from 0.04 ±0.10 to 0.99±0.24 and 0.10±0.22 to 0.59±0.20, respectively for body weights and from 0.01±0.09 to 0.63±0.19 and 0.03±0.28 to 0.38±0.15, respectively for ADG. The genetic correlations between body weights at various ages were moderate to high and ranged from –0.32 ± to 0.60 to 0.99±0.01 in Black and from 0.71±0.12 to 0.99±0.01 in Brown strains. The genetic correlations between ADG at different ages ranged from –0.26±0.33 to 0.99±0.02 in Black and from 0.40±0.21 to 0.95±0.03 in Brown strain. The selection differentials in males were higher than in females. The expected genetic gain ranged from 4.52 to 10.34 g in males and from 8.12 to 20.86 g in females. The results of the present study revealed a substantial genetic gain in body weights was obtained in the two generations of selection for high 6-week body weight.

Source : IPSACON-2005

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