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当前位置: 首页 > 文章 > The influence of phytase, pre-pellet cracked maize and dietary crude protein level on broiler performance via response surface methodology 畜牧与生物技术杂志(英文版) 2019,10 (1)
Position: Home > Articles > The influence of phytase, pre-pellet cracked maize and dietary crude protein level on broiler performance via response surface methodology Journal of Animal Science and Biotechnology 2019,10 (1)

The influence of phytase, pre-pellet cracked maize and dietary crude protein level on broiler performance via response surface methodology

作  者：
Amy F. Moss;Peter V. Chrystal;Y. Dersjant-Li;Peter H. Selle;Sonia Yun Li
单  位：
Poultry Research Foundation within The University of Sydney, Camden, Australi;Danisco Animal Nutrition, DuPont Industrial Biosciences, Marlborough, UK; School of Environmental and Rural Science, University of New England, Armidale, Australia;Poultry Research Foundation within The University of Sydney, Camden, Australia
关键词：
Crude protein;Maize;Phytase;Pre-pellet whole grain;Response surfac
摘  要：
Background The reduction of crude protein levels in diets for broiler chickens may generate economic, environmental and flock welfare and health benefits; however, performance is usually compromised. Whole grain feeding and phytase may improve the utilization of reduced crude protein diets. Results The effects of pre-pellet cracked maize (0, 15% and 30%) and phytase (0, 750 and 1500 FTU/kg) in iso-energetic maize-soy diets with three levels of crude protein (22%, 19.5% and 17%) were evaluated via a Box-Behnken response surface design. Each of 13 dietary treatments were offered to 6 replicate cages (6 birds/cage) of male Ross 308 broiler chicks from 7 to 28 d post-hatch. Model prediction and response surface plots were generated from experimental data via polynomial regression in R and only significant coefficients were included and discussed in the predicted models. Weight gain, feed intake and FCR were all influenced by pre-pellet cracked maize, phytase and crude protein level, where crude protein level had the greatest influence. Consequently, the reduction from 22% to 17% dietary crude protein in non-supplemented diets reduced weight gain, feed intake, relative gizzard weight, relative gizzard content and relative pancreas weight but improved FCR. However, the inclusion of 30% cracked maize to 17% crude protein diets restored gizzard weight and 1500 FTU phytase inclusion to 17% crude protein diets increased relative gizzard contents and pancreas weights. Cracked maize and phytase inclusion in tandem to 17% crude protein diets increased weight gain, feed intake and FCR; however, this FCR was still more efficient than broilers offered the non-supplemented 22% crude protein diet. Broilers offered the pre-pellet cracked maize and phytase inclusions reduced AME in 22% crude protein diets but improved AME by 2.92 MJ (14.16 versus 11.24 MJ; P < 0.001) in diets containing 17% crude protein. Ileal N digestibility was greater in broilers offered diets with 17% crude protein than those offered the 22% crude protein diet; irrespective of phytase and pre-pellet cracked maize. Conclusion Pre-pellet cracked maize and phytase inclusions will improve the performance of broilers offered reduced crude protein diets.

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