Response of three laying hen genotypes to two feed calcium levels
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چکیده
منابع مشابه
Egg Iron Enrichment in Response to Various Levels of Pomegranate by-Product in Laying Hen Diet
The present study was conducted to investigate the effects of different levels of pomegranate by- product (PBP) on performance, egg quality and blood parameters in laying hens. A total of 144 Bobze layer hens from 44 to 56 weeks during 12 weeks were randomly assigned into 4 treatments including 0 (control, corn and soy bean meal), 4, 8 and 12% of PBP, with 4 replicates and 9 layers in each. Res...
متن کاملIntestinal Calcium Uptake, Shell Quality and Reproductive Hormones Levels of Three Laying Hen Varieties after Prolonged Egg Production
Hy-Line W98, W36, and Brown hens are among the most popular strains for commercial egg production. It is of interest to evaluate the differences in performance of old hens of each variety. As part of a larger study, hens of the three varieties were maintained under production longer than 100 weeks of age and hens of each strain were randomly selected for in vitro calcium uptake (CaT) by duodena...
متن کاملThe response of liver enzymes to feed restriction and subsequent ad lib. feeding in the laying hen.
1. The effects of restricted feeding, and ad lib. feeding following food restriction, on hepatic carbohydrate and lipid metabolism in the laying hen were studied. 2. The birds were allocated to four groups and given either 92, 84 or 75 g/d or allowed ad lib. access to food. 3. Food restriction significantly reduced liver total lipid content compared with ad lib.-fed control birds and this was r...
متن کاملMicrobiological impact of three commercial laying hen housing systems1
Hen housing for commercial egg production continues to be a societal and regulatory concern. Controlled studies have examined various aspects of egg safety, but a comprehensive assessment of commercial hen housing systems in the US has not been conducted. The current study is part of a holistic, multidisciplinary comparison of the diverse aspects of commercial conventional cage, enriched colony...
متن کاملEffect of Different Levels of Germinated Barley on Performance and Egg Quality in Laying Hen
Objective: The experiment was conducted to evaluate the effect of different levels of germinated barley on performance and egg quality in laying hen. Methods: One hundred and twenty laying hens, 44-weeks old, Lohmann LSL hens were used in this experiment. Birds were assigned randomly to the groups, each of which consisted of 20 birds (4 replicate cages each containing 5 birds). The experiment w...
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ژورنال
عنوان ژورنال: Czech Journal of Animal Science
سال: 2019
ISSN: 1212-1819,1805-9309
DOI: 10.17221/228/2019-cjas