Genetic correlations between purebred and crossbred performance and purebred and crossbred heritabilities were estimated for egg production traits of laying chickens using a multivariate sire model accounting for additive relationships between sires. Two sire lines, denoted lines 1 and 2, were crossed to one dam line to produce crossbred progeny. Records for egg weight, egg specific gravity, an...

Aim: In the present study, egg quality traits of endangered Nicobari fowl and its crosses (Nicorock and Nishibari) were evaluated under intensive (deep litter) as well as backyard system, in the regions of Andaman and Nicobar Islands, India. Materials and Methods: Fresh eggs (15) of all the three genetic groups of birds were collected randomly from institute farm (intensive system) and from far...

this experiment was conducted to evaluate and compare antibiotic, organic acid, probiotic and prebiotic effects on performance, egg quality and blood metabolites in commercial laying hens. the experiment was a completely randomized design with 160 laying hens strain hy line (w-36) from 32 to 42 weeks of age with 5 treatments and 4 replicates of 8 hens each. the experimental treatments consisted...

Growth hormone (GH) has diverse functions in animals, together with other hormones from the somatotropic axis. Here, chicken GH (cGH) was investigated in recessive white chickens and Qingyuan partridge chickens as a candidate gene affecting egg production traits. Chicken egg production traits were studied in association with 4 selected single nucleotide polymorphisms (T185G, G662A, T3094C, and ...

this experiment was designed to evaluate the effects of different sources of calcium at different rates and cholecalciferol(vitamin d3) on the performance and egg quality of hy-line w-36 laying hens. in this study a total of 648 hens were managed in a completely randomized design using a factorial arrangement of 3 × 3 × 2 treatments, with three calcium sources (oyster shell, os; ground limeston...

an experiment was conducted to investigate the effects of using different levels of red pepper powder (rp) and marigold flower powder (mf) on egg production, egg yolk color andsome blood metabolites in laying hens. ninety, 103-weeks old laying hens were divided into 5 treatments groups of 6 birds in each cage with 3 replicates in a completely randomized design. the birds were fed a corn-soybean...

this experiment was conducted to evaluate the effects using of different levels of rosemary hydro-alcoholic extract (rosmarinus officinalis l.) on productive performance and egg quality indicators, in laying hens. the levels of rosemary hydro-alcoholic extract in this experiment were 0, 500, 1000 and 1500ppm. this experiment was conducted in a blok completely randomized design with 160 “hy-line...

Appreciated for their versatile nutritive value and functional properties, eggs are considered as an important item in human diet. Eggs are one of the most common foods available worldwide as they play an important role in human diet by providing humans with protein, lipids, minerals and vitamins in an adequate amount. Chicken breeds differ in physical and biochemical contents in terms of eggs ...