rooh-o-lah gaykani; mojtaba zaghari; mahmood shivazad
Volume 39, Issue 1 , February 2009
Abstract
The present study was carried out to investigate the effects of different levels of canola meal eithr with or without phytase addition on laying hen's performance. A number of 288 layer hens (the strains of Hy-line W36) at the 60th week of age, selected as based on the same egg production percentage ...
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The present study was carried out to investigate the effects of different levels of canola meal eithr with or without phytase addition on laying hen's performance. A number of 288 layer hens (the strains of Hy-line W36) at the 60th week of age, selected as based on the same egg production percentage and body weight were, assigned to a factorial arrangement with a completely randomized design of 18 treatments (each treatment in 4 replicates). The factors included 6 levels of canola meal replacements (0, 20, 40, 60, 80 and 100%) and 3 methods of enzyme addition namely: 1-without enzyme 2-with enzyme (rations balanced with nutrient’s derived from the enzyme accounted for in feed formulation and 3-with enzyme and derived nutrients from the enzyme not taken into account in formulating the ration. The experiment was performed in three 28 day periods. The results indicated that feed intake was not affected by canola meal and enzyme and it was not affected by the interaction between enzyme and canola meal either. Phytase and canola meal addition to layer diet had no significant effect on mass egg production. Egg weight was affected by different levels of canola meal (P0.05). The effect of canola meal and phytase on toe ash as well as its Ca and P content was significant (P
shirin honar bakhsh; mojtaba zaghari; mahmood shivazad
Volume 39, Issue 1 , February 2009
Abstract
The effect of saline water and dietary betaine on growth performance of 576 male broiler chicks from 11 to 42 days of age, and on carcass composition (percentages of carcass, sartorial, breast, liver, abdominal fat and heart) of a sub sample of 96 birds was studied in a CRD experiment. Three dose levels ...
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The effect of saline water and dietary betaine on growth performance of 576 male broiler chicks from 11 to 42 days of age, and on carcass composition (percentages of carcass, sartorial, breast, liver, abdominal fat and heart) of a sub sample of 96 birds was studied in a CRD experiment. Three dose levels of sodium chloride (0, 1000 and 2000 mg/L) and 4 levels of betaine (0.000, 0.075, 0.150 and 0.225 percent) were added to drinking water and basal diet, respectively. Feed was provided ad libitum and water in free access. Data showed that betaine supplementation and added NaCl in water increased and improved body weight and FCR, respectively (P< 0.05). Feed intake increased through a consumption of high levels of added NaCl, at the 11 to 21 and 29 to 42-d age periods(P< 0.01). Chicks which consumed higher levels of NaCl in water showed higher percentages of breast (P< 0.01). Interaction between betaine and water salinity was significant on body weight and FCR at 21-d age experimental period(P< 0.05). The data imply that betaine supplementation may have been involved in protection of intestinal epithelium against osmotic disturbance (saline water), improved digestion and absorption conditions of the gastrointestinal tract and amended the usage of nutrients.
