搜索结果: 1-14 共查到“兽医学 laying hens”相关记录14条 . 查询时间(0.015 秒)
Eggshell structure,measurements,and quality-affecting factors in laying hens:a review
eggshell composition eggshell quality oviposition time genotype housing system
2016/8/1
Eggshell quality is one of the most significant factors affecting poultry industry; it economically influences egg production and hatchability. Eggshell consists of shell membranes and the true shell ...
Effects of a low-phosphorus diet and exogenous phytase on performance,egg quality,and bacterial colonisation and digestibility of minerals in the digestive tract of laying hens
layers eggshell microbial 3-phytase ileum caecum Lactobacillus spp
2015/12/17
The objective of the experiment was to determine the effects of different levels of phytase (0, 150, 250, and 350 phytase units (FTU)/kg; F) produced by Aspergillus niger in the diets of hens fed decr...
Retention of carotenoids in egg yolks of laying hens supplemented with heterotrophic Chlorella
lutein zeaxanthin enriched eggs Chlorella algae layers
2015/6/24
The present study investigated the effect of 1 and 2% feed supplementation with biomass of Chlorella grown through heterotrophic fermentation on the concentration of total and individual carotenoids i...
Interaction between oviposition time, age, and environmental temperature and egg quality traits in laying hens and broiler breeders
hen production type age temperature oviposition
2015/6/23
An experiment with laying hens and broiler breeders of two ages (young 22 vs. 36 weeks, old
83 vs. 64 weeks) and at temperatures of 20 and 28°C was carried out to evaluate the interactions between
...
Egg production, egg quality, and lipid peroxidation status in laying hens maintained at a low ambient temperature (6°C) and fed a vitamin C and vitamin E-supplemented diet
cold stress vitamin C vitamin E
2015/1/28
This experiment was conducted to evaluate the effects of vitamin C (L-ascorbic acid) and vitamin E (α-tocopherol acetate) on egg production, egg quality, lipid peroxidation status (measured as MDA), a...
Osteoclast-Like Cell Formation in Medullary Bone Marrow Cell Culture of Laying Hens
hen medullary bone osteoclast egg-laying cycle culture
2009/7/31
Marrow cells were isolated from medullary bone of hens at two opposing phases, the bone formative and resorptive phases, of the egg-laying cycle. These cells were cultured for up to 14 days on cover s...
Changes in the Localization of MHC Class II Positive Cells in Response to Salmonella enteritidis Invasion in the Ovary of Laying Hens
follicles ovary MHC-II+ cells Salmonella enteritidis
2009/7/31
Major histocompatibility complex class II (MHC-II) molecules play essential roles in the initiation of immune responses against pathogenic agents. Salmonella enteritidis (S. enteritidis) bacteria may ...
Expressions of Antimicrobial Peptide Gallinacin-1,-2 and-3 mRNAs in the Oviduct of Laying Hens
antimicrobial peptide chicken gallinacin oviduct mRNA expressions
2009/7/31
The aim of this study was to determine the profiles of mRNA expressions of gallinacin (Gal)-1, -2 and -3, which are the antimicrobial peptides, in the oviduct of laying hens. The oviductal tissues of ...
Expression of MHC Class I and II in Growing Ovarian Follicles of Young and Old Laying Hens,Gallus domesticus
age of birds follicular growth gene expression laying hen MHC
2009/7/31
The aim of this study was to determine whether the expressions of MHC class I and II in the ovarian follicles change with follicular growth and aging of birds. Theca layer of white follicles (WF), the...
Enzyme Histochemical Localization of Peroxidase Activity in the Oviduct of Immature,Laying and Non-laying Hens
enzyme histochemistry hen oviduct peroxidase vagina
2009/7/30
Peroxidase may play roles in innate host immunity and affect the sperm survivability in hen oviduct. The aim of this study was to localize the peroxidase activity in the oviduct of hens and to examine...
Dynamics of Macrophages in Laying Hens during Second and Third Production Cycles after Zinc Induced Molting
antibody titers laying hen molting peritoneal macrophages zinc
2009/7/30
The influence of a non-feed removal molting program on certain parameters of cell mediated and humoral immune response of the laying birds during 2nd and 3rd production cycles were recorded. Birds at ...
Salmonella Incidence in Broiler and Laying Hens with the Different Housing Systems
broilers housing system laying hens prevalence Salmonella
2009/7/30
This study was intended to investigate a contamination of Salmonella in broilers (intensive production system) and laying hens with different housing system (conventional and enriched (furnished) cag...
Effect of Dietary Betaine Supplementation on mRNA Expression and Promoter CpG Methylation of Lipoprotein Lipase Gene in Laying Hens
betaine CpG methylation laying hen lipoprotein lipase gene mRNA expression
2009/7/29
In laying hens, dietary betaine supplementation is reported to reduce abdominal fat, however, the mechanism of which remains largely unknown. The present study investigated the effect of dietary betai...
Physiological Response and Postmolt Performance of Laying Hens Molted by Non-Feed Removal Methods
Feed deprivation laying hens molting non-feed removal
2009/1/19
One experiment was conducted to evaluate the physiological response and postmolt performance of laying hens subjected to non-feed removal molting programs. One hundred and eighty 78-week-old Hy-line ...