SELECTION FOR SOME PRODUCTIVE TRAITS IN NORFA LAYING HENS
نویسندگان
چکیده
منابع مشابه
Curvilinear inbreeding effects on some performance traits in laying hens.
Quadratic partial regression coefficients were estimated for the inbreeding level on five performance traits (body weight, average egg weight, age at first egg, percentage of fertilized eggs, and hatchability of set eggs) of two strains of laying hens. Data on 5631 of H77 layers and 3563 of N88 layers from nine consecutive generations were analysed. Only dams were accounted for. Partial regress...
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An experiment was conducted to study the effect of Epinephrine (EP) and bromocriptine (BR) on productive traits of laying hens. Thirty White Leghorn hens, 50 weeks old, were divided into three equal treatments (with 10 hens for each treatment): control, physiological serum (0.5 mL/hen/week), EP (0.5 mL/hen/week) and BR (100 g/kg of body weight (BW); w/v in absolute alcohol). Hens were injected ...
متن کاملA note on inbreeding effect on productive and reproductive traits in laying hens
Inbreeding rate and effects on production (body weight, age at first egg, egg weight), and reproduction (per cent of eggs fertilized, per cent of eggs hatched as related to eggs set) traits were evaluated in 9194 layers belonging to two strains. The individual inbreeding coefficients were calculated using Wright’s formula from available performance records across nine generations. The inbreedin...
متن کاملEffect of Epinephrine and Bromocriptine on Ovary Folliculogenesis and Productive Traits of Laying Hens
Egg production rate is a positive economical factor in commercial laying hens. In egg industry, the only source of income is the number and weight of eggs laid in a laying cycle, therefore, researchers have been trying to find approaches to increase the egg number in each laying cycle. In general, a hen lays eggs in clutches with a pause of one or a few days in between the clutches (pause days)...
متن کاملEffects of Isoflavones in Feed on Plasma Estradiol Concentration and Productive Performances in Laying Hens
Isoflavones are phytoestrogens which have estrogen-like activity in animals and humans with structure similar to 17-β-estradiol and capable of binding to estrogen receptors (ERs).This experiment was conducted to demonstrate the effect of isoflavones on estradiol concentration in blood and its influence on the productive performances in ISA Brown laying hens fed with supplemented feed with large...
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ژورنال
عنوان ژورنال: Menoufia Journal of Animal Poultry and Fish Production
سال: 2019
ISSN: 2735-3478
DOI: 10.21608/mjapfp.2019.174816