Influence of sire on internal egg quality and linear body traits of Japanese quail raised in the humid tropical environment

A total of 270 pedigreed-hatched day old chicks of three strains of Japanese quail generated from a base population of 36 adultswere used in a randomized complete block design to estimate the influence of sire on the internal egg quality and linear body traits of the birds. Parameters measured were internal egg quality traits - albumen height, yolk height, albumen weight, yolk weight, albumen diameter, albumen length, yolk width, yolk length, yolk index, and haugh unit, and growth traits - body weight, thigh length, breast length, body length, keel length, wing length, and shank length. Results showed that linear body parameters were significant (P<0.05) except body weight at week 9. Panda white x Cinnamon brown (PWxCB) progenies out-performed the progenies of the other strains mainly at week 9. The PWxCB strain had the highest values in the following: body weight (159.30), thigh length (4.76), breast width (7.40), body length (11.94), keel length (6.77), and shank length (3.44). The haugh unit value was significantly (P< 0.05) different among the three strains mainly at week 8 with CBxCB strain having higher value of (89.07) followed by PWxCB strain (89.03). The phenotypic correlations between the linear body parameters and internal egg quality traits in Cinnamon brown x Cinnamon brown (CBxCB) strain were significant (P<0.01) in keel length and yolk weight (0.534) and between shank length and yolk weight (0.473) at week 9. For PWxCB strain, high significant (P<0.01) correlation were seen between shank lengthand albumen length (0.631) at week 8, body weight and yolk index at week 9. Silver brown x Cinnamon brown (SBxCB) strain also showed high positive significant (P<0.01) correlation between shank length and yolk weight (0.541), breast width and albumen weight (0.537) and between body length and albumen weight (0.625) at week 9. These positive correlations imply that by direct selection for any linear body trait for increased meat production, there will be a remarkable genetic improvement in the internal egg quality trait. It can be concluded that PWxCB is a strain of choice for improved growth and internal egg quality characteristics. Keywords: Japanese quail, humid tropics, linear body traits, internal egg qualit