منابع مشابه
Ecological and Social Factors Affecting Hatchability of Eggs
--Hatchability, defined as the proportion of eggs surviving to the end of incubation that hatch, varies among populations of birds. Here, I examine the effects of a variety of variables on hatchability in a comparative analysis of 155 studies of 113 species. Of the ecological nd geographical variables considered, latitude, diet, and nest type explain a significant amount of the variance in hatc...
متن کاملSystematic factors that affect ostrich egg incubation traits
Z. Brand, S.W.P. Cloete, C.R. Brown and I.A. Malecki 1 Department of Animal Sciences, University of Stellenbosch, Private Bag X1, Matieland 7602, South Africa 2 Institute for Animal Production: Oudtshoorn, PO Box 313, Oudtshoorn 6620, South Africa 3 Institute for Animal Production: Elsenburg, Private Bag X1, Elsenburg 7607, South Africa 4 Institute of Science & the Environment, University of Wo...
متن کاملEffect of Genotype, Age and Season on Hatchability of Egg
The study was conducted to study the effects of genotype and age of hen and hatching season on hatchability of egg. Hatching eggs were collected from hens having three genotypes viz. White Leghorn (WLH), Rhode Island Red (RIR) and Fayoumi covering three age groups (28 to 40, 41 to 60 and 61 weeks & above) at winter, monsoon and summer seasons. The study revealed that the highest (P<0.05) averag...
متن کاملInfluence of air composition during egg storage on egg characteristics, embryonic development, hatchability, and chick quality.
Egg storage beyond 7 d is associated with an increase in incubation duration and a decrease in hatchability and chick quality. Negative effects of prolonged egg storage may be caused by changes in the embryo, by changes in egg characteristics, or by both. An adjustment in storage air composition may reduce negative effects of prolonged egg storage because it may prevent changes in the embryo an...
متن کاملFuzzy modeling to predict chicken egg hatchability in commercial hatchery.
Experimental studies have shown that hatching rate depends, among other factors, on the main physical characteristics of the eggs. The physical parameters used in our work were egg weight, eggshell thickness, egg sphericity, and yolk per albumen ratio. The relationships of these parameters in the incubation process were modeled by Fuzzy logic. The rules of the Fuzzy modeling were based on the a...
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ژورنال
عنوان ژورنال: Poultry Science
سال: 1999
ISSN: 0032-5791
DOI: 10.1093/ps/78.9.1257