搜索结果: 61-75 共查到“农学 Laying Hens”相关记录94条 . 查询时间(0.062 秒)
Dietary L-Carnitine Supplementation Improves Albumen Quality of Laying Hens
L-carnitine albumen height haugh unit laying hens
2009/7/31
The effect of L-carnitine supplemented into a commercial diet on egg weight, albumen height, Haugh unit, yolk weight and albumen weight of eggs from laying hens was examined. The levels of dietary L-c...
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 ...
Effects of Restricted Feeding Molt Diet on Induction of Molt and Energy Intake in Laying Hens
energy intake estradiol induced molting molt diet
2009/7/30
This experiment aimed to determine the effects of restricted feeding a molt diet on molt induction in laying hens. Single Comb White Leghorn hens (age, 61wk) were housed in individual cages and random...
Evaluation of Non-Feed Removal Induced Molting in Laying Hens
induced molting molt diet post-molt performance stress
2009/7/30
This study aimed to evaluate the effects of a molt diet on molt induction and the post-molt performance of laying hens. White Leghorn hens (age, 62wk) were randomly divided into three groups (two expe...
Effect of Graded Replacement of Soybean Meal by Faba Beans (Vicia faba L.) or Field Peas (Pisum sativum L.) in Rations for Laying Hens on Egg Production and Quality
anti-nutritional factors egg quality faba beans field pea layers
2009/7/30
Two separate randomised block design experiments were each carried out for 13 months to investigate the effects of replacing, in-part, soybean meal (SBM) and wheat by graded levels of faba beans (FB) ...
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...
Investigation of ME Level of Molt Diet for Full Fed Induced Molting in Laying Hens
energy level induced molting molt diet post-molt performance
2009/7/30
This study investigated the suitable metabolizable energy (ME) level of molt diet for hens that cease producing eggs without being subjected to great stress. During the preliminary period, White Legho...
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...
Effects of Molt-induction Period on Induction of Molt and Post-molt Performance in Laying Hens
layer molt diet molt-induction molt-induction period post-molt performance
2009/7/29
This experiment was conducted to determine the effects of molt-induction period on molting and post-molt performance of laying hens. White Leghorn hens at 64 weeks of age were used. After a 4-week pre...
Effects of Organic Iron Supplementation on the Performance and Iron Content in the Egg Yolk of Laying Hens
egg shell color iron content of egg-yolk iron-methionine chelate iron-soy proteinate
2009/7/29
An experiment was conducted to determine the efficacy of dietary iron-soy proteinate (Fe-SP) and iron-methionine chelate (Fe-Met) on the performance of laying hens and iron content in egg yolk. Eigh...
AMMONIA, DUST AND BACTERIA IN WELFARE-ORIENTED SYSTEMS FOR LAYING HENS
poultry laying hens air quality work environment pollutants ammonia
2010/12/22
The use of litter and manure in welfare-oriented systems for laying hens may negatively affect the air quality and the work environment. The objective of the current case study was to compare concentr...
Comparative Effects of Phytase Derived from Escherichia coli and Aspergillus niger in Sixty Eight-week-old Laying Hens Fed Corn-soy Diet
Laying Hens Phytase Egg Quality Egg Production Serum
2016/5/3
Two hundred and sixteen 68-week-old Hy-Line brown laying hens were used in a 6-week feeding trial to compare the efficacy of phytases Optiphos (OPT) and Natuphos (NAT), which were isolated from Escher...
Effects of Chilled Drinking Water on Performance of Laying Hens during Constant High Ambient Temperature
Chilled Drinking Water Egg Production Egg Quality Heat Stress Laying Hen
2016/4/29
The present study was conducted to evaluate the effect of chilled drinking water on the productivity of laying hens under constant high ambient temperature. A total of seventy-two, 123-day-old Hy-line...
Influence of Natural Zeolite on Performance of Laying Hens and Egg Quality
Natural Zeolite Hens Egg Quality
2009/1/23
This experiment was conducted to study the effects of natural zeolite on the performance of laying hens. One hundred and eighty 37-week-old Babcock B-300 hens were fed with a diet containing 0, 20, 4...