two experiments were conducted to determine threonine (thr) requirements of two commercial strains, ross 308 and cobb 500, based on standardized ileal digestibility from 15 to 28d of age. basal diet consisted of wheat, triticale, and corn gluten meal was formulated according to quick chick (2006) to be adequate in all nutrients except for thr. incremental levels of supplemental thr were added t...

This study was performed to investigate the effects of antibiotic, organic acid, probiotic and prebiotic supplementation on performance, egg shell quality, pH value of gastrointestinal (GI) tract and small intestinal morphology of laying hens. The experiment was a completely randomized design with 160 laying hens strain (W-36) from 32 to 42 weeks of age, with five treatments, four replicates an...

The current experiment was designed to evaluate the efficacy of adding the multi-enzyme mixture (Natuzyme) into layers' diets with different levels of energy and available phosphorus in relation to laying performance, egg qualities, blood cholesterol level, microflora and intestinal viscosity. Two hundred and fifty 43-wk-old Hy-Line commercial layers were divided into five groups with five repl...

a total of 150 day old female chickens (ross 308) were randomly allocated to 2 groups with 5 replicate and 15 chicks in each replicate to determine the effects of cold induced ascites on performance, antioxidant status, blood enzyme activities and bone metabolism. the two experimental treatments were: 1) chicks that reared under normal temperature (nt) and 2) chicks that reared under cold tempe...

the objective of this study was to evaluate the effects of cottonseed meal (csm) treated with sodium bentonite (sb) on certain blood components and immune response of laying hens. a 3 × 3 factorial arrangement with 3 levels of sb (0, 10, and 20 g/kg of diet) and 3 levels of csm (0, 100 and 200 g/kg of diet) were used within 9 dietary treatments of 4 replicates each. nine mash diets were fed to ...

This experiment was undertaken to evaluate the effect of dietary level of artichoke (Cynara scolymus) on growth performance and immune response of broilers under heat stress (HS). Two hundred forty day-old broiler chicks (Ross, 308) were randomly assigned to one of four dietary treatments with four replicate pens per treatment (15 birds per pen) in a completely randomized design with a 2 × 4 fa...

This experiment was conducted to explore the effect of long-term supplementation 25-hydroxyvitamin D3 (25-OHD) as a vitamin (VD3) substitute on performance, bone traits, and egg quality laying hens from 1 day 72 weeks age. In total, 900 one-day-old Lohman pullets were randomly allotted into three dietary groups (three treatments × 15 replicates 20 birds per replicate): VD3 2800 IU/kg; 25-OHD 69...

the present study was carried out to examine the effect of supplemental dietary valine in the starter diet of broilers (0-15 d of age) on performance, antibodyresponse to newcastle disease virus vaccination and bone mineralization. the experiment was conducted using 300 ross 308 male broilers. one-day-old chicks were randomly allotted to 3 groups; each group consisted of 5 replicate pens with 2...