Using Coefficient of Variation to Study the Carcass Traits Uniformity for Three Lines of Japanese Quail

Abstract

Abstract Quail body weight and its traits are important to poultry breeders and processors. Body weight correlated positively and negatively to several linear body measurements. Moreover, body weight affected by several factors such as age, sex, breed, rearing and feeding system, handling and slaughtering conditions. Two hundred ten day old unsexed Japanese quail chicks were obtained from three genetic lines of Japanese quail to study carcass traits uniformity by using coefficient of variation. At 40 days of age the feed was withdrawn for 6h, the birds were weighed individually to obtain live body weight. Thereafter the birds were slaughter by knife and let to bleed for 3 min. After the removal of feathers, the carcasses were dissection manually into various parts (chest, thigh, wings, back, head, nick, feet, heart, liver, and gizzard) and weight in gram by using electronic balance with (0.001) sensitivity. General Linear Model within the statistical program SPSS was used to study the effect of genetic lines and sex on carcass traits. Some traits were non-significant effected between the genetic lines such as in male were (Live body weight, head, nick, heart, liver, gizzard), and in female (live body weight, carcass, chest, wing back, head, feet, heart, liver, gizzard). We conclude that the carcass traits of Japanese quail differ among the three genetic lines (white, brown, and grey). And the high values of coefficient of variation may due to the breeding system of the birds.