Genetic parameter estimates of juvenile body weight traits in naked neck and dwarf gene lines

B.L.N.Reddy, M.Niranjan, A.K.Panda and R.P.Sharma
Project Directorate on Poultry, Rajendranagar, Hyderabad-30

40 sires mated to 4 dams each producing 2312 chicks in 4 hatches in naked neck and with same number of sires and dams producing 1437 chicks in dwarf in 4 hatches were utilized for the estimation of genetic parameters. Juvenile body weight traits recorded were 4 week body weight and 6 week body weight in both the lines under uniform conditions of feeding, management and disease control as far as possible. The body weights were recorded to the nearest of 10g accuracy. Data were corrected for effect of hatch by least square constant ( Harvey, 1975). The heritabilities were estimated using variance component analysis (King and Henderson, 1954). Genetic correlations were obtained from variance-covariance component analysis as per Becker (1964). In naked neck gene line heritabilty estimates of 4 week body weight were 0.21±0.08,0.24±0.08 and 0.22±0.05 from sire, dam and sire + dam components respectively. For 6week body weight these estimates respectively were 0.14±0.05, 0.24±0.08 and 0.14±0.03.Genetic correlation of 4 WK body weight with 6WK body weight were 0.88±0.11, 0.90±0.04 and 0.86±0.04 from sire, dam and sire + dam components respectively. These genetic correlations were found to be high and significant. In dwarf gene line Heritability estimates of 4 WK body weight were 0.33 ±0.12, 0.21 ±0.10 and 0.27 ±0.06 from sire, dam and sire + dam components respectively. For 6 WK body weights these estimates respectively were 0.39±0.14, 0.40±0.12 and 0.40±0.08.Genetic correlations of 4WK body weight with 6 WK body weight were 0.73±0.12, 0.49±0.20 and 0.62±0.09 from sire, dam and sire+dam components respectively. These genetic correlations were also found to be high and significant. Maternal effects were found to be important in the inheritance of juvenile body weights in both naked neck and dwarf gene lines.

Source : IPSACON-2005

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