Inheritance of important economic traits in two strains of White Leghorn
P. VEERAMANI, K. NARAYANANKUTTY AND R. RICHARD CHURCHIL
AICRP on Poultry Improvement ,College of Veterinary and Animal Sciences
Mannuthy, Thrissur, Kerala - 680 651
A total of 50 sires mated with 300 dams to produce 2120 & 2112 progenies in IWN and IWP strains respectively. The data on age at first egg, body weight at 16 & 40 weeks, egg weight at 28 and 40 weeks, egg production at 40 & 64 weeks of age were analyzed for the inheritance. The effect of hatch was significant for most of the traits studied. The heritability estimates for age at first egg, egg weight and egg production at different ages were low to moderate (0.13 to 0.29) and for body weight the heritability ranges from 0.38 to 0.41 in IWN strain. In IWP strain the heritability estimate was higher for egg weight at 28 weeks (0.58) and lowest heritability was estimated for the egg number at 64 weeks (0.18). The heritability estimates were in general higher in IWP than IWN strain. The genetic and phenotypic correlation of annual egg production with age at first egg and egg weight were negative. The positive correlation was exerted between body weight and egg weight. The correlation within body weight at different ages and egg weight at different ages was also positive. The age at first egg showed a negative genetic and phenotypic association with 16 week body weight in both the strains.