الانتخاب للعمر عند النضج الجنسي و علاقته ببعض الصفات النوعية لبيض طائر السلوى الياباني

Abstract EN

This study was carried in poultry farm of animal resources department for the period from 20/10/2012 to 20/6/2013 to demonstrate the effect of the selection for age at sexual maturity for japanese quails brown at some egg quality traits.

Used in this study for all 1000 bird at one day age .

at 21 day of age all birds were sexed according to color pattern of pluage , Used 168 females to the parents generation which was distributed individually in cages and record the date of the first eggs per female and female were divided into three groups selected are early, medium and late age at sexual maturity.

each group was divided into ten families by one male and three females each family and the number was used in the study, 30 males and 90 females were hatching egg production index sons by groups and their hosts were recorded production traits of both parents and sons .

the results showed superiority group early age at sexual maturity in ratio egg shell weight with membranes and ratio yolk weight trait comparative group medium and late age at sexual maturity.

superiority group early and medium age at sexual maturity in albumin index and Haugh unit trait comparative group late age at sexual maturity.

superiority group medium and late age at sexual maturity in ratio albumin weight trait comparative group early age at sexual maturity.

no a significant differences was observed in egg shape index , yolk index and egg shell thickness with membranes trait between three groups early , medium and late age at sexual maturity .