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Response of laying hens to diet inclusion of canola meal as influenced by dietary nonphytate phosphorus level and microbial phytase supplementation | ||
| Journal of Livestock Science and Technologies | ||
| مقاله 1، دوره 3، شماره 2، اسفند 2015، صفحه 1-12 اصل مقاله (552.62 K) | ||
| نوع مقاله: Research Article (Regular Paper) | ||
| شناسه دیجیتال (DOI): 10.22103/jlst.2015.1052 | ||
| نویسندگان | ||
| M. Torki* 1؛ M. Habibian2؛ M. Davoodifar1 | ||
| 1Department of Animal Science, College of Agriculture and Natural Resources, Razi University, Kermanshah, Iran. | ||
| 2Department of Animal Science, Faculty of Agriculture, University of Kurdistan, Sanandaj, Iran. | ||
| چکیده | ||
| An experiment employing a factorial arrangement of three levels (0, 8 and 16%) of canola meal (CM), two levels (0.15 and 0.25%) of nonphytate phosphorus (NPP), and two levels (0 and 450 unit/kg; as fed basis) of microbial phytase was conducted using 216 Hy-Line W36 laying hens from 39 to 47 weeks of age. The birds receiving CM consumed more (P < 0.05) feed than birds receiving corn-soybean meal (SBM) diets. During the second 4 weeks of the experiment (44 to 47th weeks of age), egg production and egg mass were lower (P < 0.05) for birds receiving corn-SBM diet containing reduced NPP level; however, the adverse effects of reduced NPP were overcome by phytase supplementation (P < 0.05). During the second 4-week (44 to 47th weeks of age) and over the whole experiment (39 to 47th weeks of age), production of abnormal eggs was increased (P < 0.05) by feeding reduced NPP level; phytase supplementation decreased (P < 0.05) egg abnormality only when added to this diet. At the first egg sampling (43rd week of age), egg shape index and eggshell thickness were increased (P < 0.05) by phytase supplementation. Reduced NPP level caused a lower eggshell thickness in hens fed corn-SBM diet (P < 0.05). At the second egg sampling (47th week of age), birds fed corn-SBM diets or reduced NPP level produced eggs with lower (P < 0.05) shell thickness, whereas dietary phytase supplementation reversed these adverse effects (P < 0.05). Reduced NPP level increased serum thyroxine concentration in birds fed corn-SBM-CM diets (P < 0.05). The results showed that CM can be included in laying hen diets up to 16% during 39 to 47 weeks of age without any adverse effect on their health and productivity. Moreover, the results indicated that reduction of NPP level in corn-SBM-CM diets had little effect on performance and eggshell quality. The adverse effects of lowering NPP level in corn-SBM diets could be substantially reduced by phytase supplementation. | ||
| کلیدواژهها | ||
| bone ash؛ canola meal؛ eggshell quality؛ performance؛ phosphorus؛ phytase | ||
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