منابع مشابه
Modeling ovarian follicle growth in commercial and heritage Single Comb White Leghorn hens.
Approximately 84% of the energy in chicken eggs resides in the yolk. A robust model of ovarian follicle development is therefore valuable for estimating energy requirements of laying hens. The current experiment was designed to model the growth of ovarian follicles in 32-wk-old modern commercial line (CL) and unselected heritage line (HL) Single Comb White Leghorn hens. The volume of yolk depos...
متن کاملEffects on White Leghorn Hens of Constant Exposure to Ultraviolet Light from Insect Traps1,2
Constant exposure of Hy-Line W-36 White Leghorn hens to ultraviolet light from insect traps resulted in no significant differences in egg production, fertility, hatchability of fertile eggs, or total hatchability. Also, there were no apparent effects on the eyes of the birds. Results were the same when either blacklight or blacklight blue tubes were used. The need for additional testing of lig...
متن کاملEffects of Inclusion of Ground Prosopis juliflora Pod on Fertility and Hatchability of White Leghorn Hens
Chickens are kept in many parts of the world irrespective of climate, traditions, life standard, and there is no religious taboo related to consumption of eggs and chicken meat like those for pig meat [1]. To the poor majority people of rural areas, chickens serve as an immediate source of meat and income when money is needed for urgent family requirement [2]. It renders a significant contribut...
متن کاملEgg production curve fitting using nonlinear models for selected and nonselected lines of White Leghorn hens.
Egg production curves describe the laying patterns of hen populations over time. The objectives of this study were to fit the weekly egg production rate of selected and nonselected lines of a White Leghorn hen population, using nonlinear and segmented polynomial models, and to study how the selection process changed the egg-laying patterns between these 2 lines. Weekly egg production rates over...
متن کاملEffects on white Leghorn hens of constant exposure to ultraviolet light from insect traps.
Constant exposure of Hy-Line W-36 White Leghorn hens to ultraviolet light from insect traps resulted in no significant differences in egg production, fertility, hatchability of fertile eggs, or total hatchability. Also, there were no apparent effects on the eyes of the birds. Results were the same when either blacklight or blacklight blue tubes were used. The need for additional testing of ligh...
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ژورنال
عنوان ژورنال: Poultry Science
سال: 1978
ISSN: 0032-5791
DOI: 10.3382/ps.0570619