Genetic analysis of comb and wattle measurements in different lines of egg -type chickens
SAMRAT KHURANA, M.L. CHAUDHARY AND G.S. BRAH
Department of Animal Breeding and Genetics ,College of Veterinary Sciences
Punjab Agricultural University, Ludhiana-141004
Comb height, width and wattle length of two selected strains (PL1 and PL2) and a control line of White Leghorn were studied from 16 to 40 weeks of age. There were no significant difference between the two strains in height and width of comb, however wattle length of strain PL2 was significantly higher than strain PL1 at 16 weeks of age. Comb height of strain PL2 was significantly higher than its unselected control line, PL3 at 16 and 32 weeks of age, however control line had a broader comb base. Wattle length of control line, PL3 was longer than the selected strains at 32 and 40 weeks of age. The estimates of heritability varied across strains and stages between 0.16 ± 0.10 and 0.61 ± 0.20 for comb height; between 0.10 ± 0.08 and 0.48 ± 0.19 for comb width; between 0.12 ± 0.09 and 0.95 ± 0.23 for wattle length. The genetic correlations of comb and wattle measurements with egg production to 40 weeks, egg mass and efficiency index were positive.