نتایج جستجو برای: breeder hens

تعداد نتایج: 11002  

Background: It has been shown that zinc has an effect on physiological responses in animals and birds. On the other hand, dietary phytase in poultry results in increased availability of zinc. OBJECTIVES: This study was conducted to investigate the effects of zinc oxide (ZnO) and Escherichia coli-derived 6-phytase supplemented diets on the plasma metabolites and enzyme activities of broiler bree...

Journal: :Poultry science 2010
R Taherkhani M Zaghari M Shivazad A Zare Shahneh

To evaluate the effects of different methods of feed allocation on performance, plasma hormone concentration, and ovarian morphology, an experiment was conducted using 32 Cobb 500 broiler breeder hens. The experiment was started at 27 wk and lasted to 39 wk of age. Feeding regimens included: i) hens with an ad libitum feeding program, ii) hens that received their restricted feed once a day, iii...

جواد پوررضا, , حسن نصیری مقدم, , حسن کرمانشاهی, , احمد حسن آبادی, , داگلاس کورور, ,

In the current experiment seven catheterized broiler breeder hens were used at 60 weeks of age. Retention of 14CO2 in the body of the hens following continuous infusion of NaH14CO3 during each of tow-30-hr continuous infusion studies was determined. Oxidation rate plateau was established within two hours in each experiment. Recovery of 14CO2 at the steady state in the first and second study wer...

Journal: :iranian journal of veterinary medicine 2016
hossein sharideh mahdi zhandi mojtaba zaghari amir akhlaghi

background: it has been shown that zinc has an effect on physiological responses in animals and birds. on the other hand, dietary phytase in poultry results in increased availability of zinc. objectives: this study was conducted to investigate the effects of zinc oxide (zno) and escherichia coli-derived 6-phytase supplemented diets on the plasma metabolites and enzyme activities of broiler bree...

Journal: :Poultry science 2008
J M Spradley M E Freeman J L Wilson A J Davis

Broiler breeder hens are typically provided a restricted amount of feed once a day. This feed is rapidly consumed; therefore, the hens fast for an extended period of time before their next feeding. In the current research, the effects on reproductive performance of implementing a twice-a-day vs. a once-a-day feeding program after photostimulation were investigated. Pullets and cockerels were re...

Journal: :Poultry science 2006
N A Cox L J Richardson R J Buhr J S Bailey J L Wilson K L Hiett

Two studies were conducted to determine whether Campylobacter jejuni could rapidly spread and reside in the internal organs of adult broiler breeder hens. In Study 1, university-housed broiler breeders at 22 wk of age were obtained and placed in individual cages. Each hen was intravaginally inoculated weekly from 23 to 32 wk of age with a characterized strain of C. jejuni. At wk 23, 27, and 32,...

Journal: :Harran üniversitesi veteriner fakültesi dergisi 2021

This study was conducted to investigate the carcass characteristics and physical meat quality properties of spent broiler breeder, commercial white, brown layer hens. Ten samples from each genotype were analyzed for muscle pH, colour characteristics, yield performance. Meat analyses performed on skinned skinless breast thigh samples, while pH measured samples. The percentage significantly highe...

Journal: :Poultry science 2003
R J Buhr J A Dickens J L Wilson

For evaluation of the filling and emptying of the alimentary tract, broiler breeder hens were cooped and processed over a 2-d period. Hens were fed at 0600 h on d 1 and after access to feed for 0, 2, 4, and 6 h were placed into coops. Half of the hens from each pen were either immediately processed or were held in coops over-night and processed the following morning, d 2. The alimentary tract w...

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