منابع مشابه
Modeling Energy Utilization in Broiler Breeders, Laying Hens and Broilers
The factorial approach has been used to partition the energy requirements into maintenance, growth, and production. The coefficients determined for these purposes can be used to elaborate energy requirement models. These models consider the body weight, weight gain, egg production, and environmental temperature to determine the energy requirements for poultry. Predicting daily energy requiremen...
متن کاملErysipelothrix rhusiopathiae in Laying Hens
The bacterium Erysipelothrix rhusiopathiae can infect a wide range of mammals (including humans) and birds. Disease outbreaks (erysipelas) have been considered unusual in chickens internationally, but outbreaks with high mortality and egg production losses have been diagnosed in Swedish laying hen flocks every year since 1998. Different aspects of E. rhusiopathiae infection in chickens were exa...
متن کاملProtein and Energy Requirements of Laying Hens and Broiler Breeders
Layer and Breeder rations are still evaluated, as a rule, on the basis of their protein content, expressed as "percent protein". This is the easiest and most practical criterion, but unfortunately it is a relative measure, depending on general feed consumption. The latter hardly relates to the productive traits of the hen, being dependent primarily on the energy content of the feed and on the e...
متن کاملComparative gonadotrophic potency of anterior pituitaries from cocks, laying hens and non-laying hens in molt.
A bulk of studies on the assay of gonadotrophic hormone content of the anterior pituitary from the animals in various reproductive conditions has been done. Riley and Fraps(1942b) assayed pituitary glands from chickens in various reproductive stages, judging the gonadotrophic potency by the increment of uterine weights of immature mice, and concluded that glands from non-laying hens produced a ...
متن کاملEffects of clofibrate treatment in laying hens.
Expression of peroxisome proliferator-activated receptor-alpha (PPARalpha) has been shown in liver of chicks, but effects of its activation have not yet been investigated. In this study, laying hens were treated with clofibrate, a synthetic PPARalpha agonist, to investigate the effects of PPARalpha activation on liver lipid metabolism. Hens receiving a diet containing 5 g of clofibrate/kg had a...
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ژورنال
عنوان ژورنال: Poultry Science
سال: 1980
ISSN: 0032-5791
DOI: 10.3382/ps.0592508