Effect of Dietary Calcium-to-Phosphorus Ratio on True Phosphorus Digestibility in Soybean Meal for Broiler Chicken Diets

LIU Jingbo, LIU Zhengqun, ZHONG Ruqing, CHEN Liang, GAO Lixiang, ZHANG Hongfu

doi:10.3969/j.issn.1006-267x.2015.06.027

2015 , Vol. 27 >Issue 6: 1891 - 1898

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.06.027

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Effect of Dietary Calcium-to-Phosphorus Ratio on True Phosphorus Digestibility in Soybean Meal for Broiler Chicken Diets

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1. State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
2. School of Life Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China

Received date: 2015-01-13

Online published: 2015-06-17

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Abstract

This study was conducted to investigate the effect of dietary calcium-to-phosphorus ratio (Ca:P) on true phosphorus digestibility (TPD) in soybean meal (SBM) for broiler chickens by the regression method and the difference method. A total of 576 male Ross broilers at 15 days of age were used in a randomized complete block design with a 3 × 3 factorial arrangement of 9 diets. There were 8 replicates per treatment with 8 birds per replicate. To study the effect of dietary Ca:P (1.0, 1.5 and 2.0) on the determination of TPD in SBM, our experiment supplemented 3 levels of SBM (30.00%, 43.00% and 56.00%). The experiment lasted for 7 days. The results showed that body weight gain, feed conversion efficiency, P output in ileal digesta, and digestible P for broilers increased linearly with dietary SBM level increasing (P<0.01). However, dry matter digestibility and apparent P digestibility decreased linearly with dietary SBM levels increased (P<0.01). Increasing dietary Ca:P enhanced P output in ileal digesta, thus reduced digestible P and apparent P digestibility (P<0.01). The estimated values of TPD in SBM for broilers fed diets with a Ca:P at 2.0 was 40.79% and 39.84% by the regression method and the difference method, respectively. These values were lower than the values of 53.36% and 55.59% for birds fed diets with a Ca:P at 1.0 and the values of 56.81% and 56.36% for chickens fed diets with a Ca:P at 1.5 derived from the regression method and the difference method, respectively (P<0.05). In summary, dietary Ca:P influenced the estimation of TPD in SBM for broiler chickens. However, the determination of TPD was not affected by the calculated methods (the regression method and the difference method).

Key words： broilers; phosphorus; true digestibility; regression method; difference method

Cite this article

LIU Jingbo, LIU Zhengqun, ZHONG Ruqing, CHEN Liang, GAO Lixiang, ZHANG Hongfu . Effect of Dietary Calcium-to-Phosphorus Ratio on True Phosphorus Digestibility in Soybean Meal for Broiler Chicken Diets[J]. Chinese Journal of Animal Nutrition, 2015 , 27(6) : 1891 -1898 . DOI: 10.3969/j.issn.1006-267x.2015.06.027

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