Slow and steady wins the race? No signs of reduced welfare in smallerbroiler breeder hens at four weeks of age
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Effect of dietary zinc oxide and phytase on the plasma metabolites and enzyme activities in aged broiler breeder hens
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...
متن کاملتعیین فاکتور ابقای بیکربنات به منظور استفاده در روش اکسیداسیون اسید آمینه شاخصدر مرغ‌های مادر گوشتی
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...
متن کاملتعیین فاکتور ابقای بیکربنات به منظور استفاده در روش اکسیداسیون اسید آمینه شاخصدر مرغ‌های مادر گوشتی
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...
متن کاملاثرات سطح انرژی و متیونین بر عملکرد و صفات تولیدمثلی مرغ‌های مادر گوشتی آرین طی دوره تولید
A 28-week experiment was conducted to study the effects of dietary energy and digestible methionine level on performance and reproductive traits of broiler breeder hens, using 280 Arian broiler breeder hens and 20 males at 26 weeks of age. The experiment was done as 2×2 factorial arrangement in a completely randomized design with 4 treatments and 5 replicates. Dietary treatments were formu...
متن کاملHistomorphometrical changes of oviduct during the long-term exposure of breeder hens to extra thyroxine
In this research a 100 day long treatment period was considered to unmask the probable adverse effects of long-term induced hyperthyroidism on histomorphometrical attributes of the oviduct in broiler breeder hens. A total of seventy 47-week-old Cobb 500 breeder hens were randomly allotted to two treatment groups (5 replicates of 7 hens each). Thyroxine (T4) was orally administered to the hypert...
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