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Effect of Phytase Superdoses and Citric Acid on Growth Performance, Plasma Phosphorus and Tibia Ash in Broilers Fed Canola Meal-Based Diets Severely Limited in Available Phosphorus | ||
| Poultry Science Journal | ||
| مقاله 4، دوره 3، شماره 1، فروردین 2015، صفحه 27-36 اصل مقاله (331.25 K) | ||
| نوع مقاله: Original Paper | ||
| شناسه دیجیتال (DOI): 10.22069/psj.2015.2325 | ||
| نویسندگان | ||
| HR Taheri* ؛ S Taherkhani | ||
| Department of Animal Science, Faculty of Agriculture, University of Zanjan, Zanjan, Iran. | ||
| چکیده | ||
| This experiment was conducted to investigate the effect of phytase superdoses alone or in combination with citric acid (CA) in canola meal-based diets severely limited in available phosphorus (Pa) on growth performance, plasma phosphorus (P), and tibia ash (TA) in broilers from 22 to 42 d of age. Two hundreds and eighty 21-d-old male broilers were used in 28 pens of 10 birds per each. The experimental diets consisted of a positive control (PC) diet and six negative control (NC) diets which consisted of two levels of CA (0 and 20 g/Kg) and three levels of phytase (0, 1000 and 4000 U/Kg) in a 2 × 3 factorial arrangement. The PC diet contained 4.3 g/Kg Pa, but all NC diets contained 1.5 g/Kg Pa. Results indicated that the birds fed the PC diet had a significantly higher average daily gain (ADG), plasma P and TA, but a lower feed conversion ratio (FCR) than those fed the NC diet. The ADG, FCR and plasma P values in birds fed NC diets supplemented with 4000 U/Kg phytase enzyme (with or without CA) significantly reached those of birds fed the PC diet. But, addition of phytase enzyme at 1000 U/Kg only plus CA to the NC diet could significantly improve FCR and plasma P. A significant interaction was observed between phytase and CA for FCR and plasma P. Although TA values in NC + 1000 U/Kg phytase treatments (with or without CA) were similar to the PC treatment, TA values of NC + 4000 U/Kg phytase treatments (with or without CA) was greater than that of the PC treatment. Results of this study showed that, in severely limited Pa corn-canola meal-based diets, supplementing 4000 U/Kg phytase or also 1000 U/Kg phytase plus CA will be sufficient to obtain the comparable feed efficiency in broilers to those fed the adequate Pa diet. | ||
| کلیدواژهها | ||
| Broiler؛ citric acid؛ Canola meal؛ Performance؛ Phytase enzyme | ||
| مراجع | ||
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Please cite this article as: Taheri HR & Taherkhani S. 2015. Effect of phytase superdoses and citric acid on growth performance, plasma phosphorus and tibia ash in broilers fed canola meal-based diets severely limited in available phosphorus. Poult. Sci. J. 3 (1): 27-36
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