Effects of Different Phosphorus Levels and Calcium to Phosphorus Ratios with Phytase Supplementation on Dietary Nutrients Apparently Digestibility in Pregnant Sows

GUO Wenwen, YANG Weiren, GUO Baolin, ZHANG Liang, WEI Maolian, WANG Dehai, ZHAO Lifang

doi:10.3969/j.issn.1006-267x.2015.03.029

2015 , Vol. 27 >Issue 3: 893 - 901

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.03.029

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Effects of Different Phosphorus Levels and Calcium to Phosphorus Ratios with Phytase Supplementation on Dietary Nutrients Apparently Digestibility in Pregnant Sows

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1. College of Animal Science and Technology, Shandong Agricultural University, Tai'an 271018, China;
2. Beijing Smistyle Science and Technology Development Co., Ltd, Beijing 100081, China

Received date: 2014-10-09

Online published: 2015-03-18

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Abstract

The objective of this study was to estimate the effects of different levels of phosphorus (P) and calcium (Ca) to P ratios with phytase supplementation on nutrients digestibility of sows during pregnancy. Thirty-six healthy and pregnant (2 to 3 fetals, 28 days prior to farrowing) sows (Landrace×Yorkshire) on the same genetic background with similar body weight (221.91±7.41) kg and close parturition date were randomly divided into 9 groups with 4 replicates per group. Sows in the control group were fed a basal diet; those in the group 2 were fed the basal diet supplemented with phytase, those in the groups 3 to 5 were fed diets with the same Ca level (7.26 g/kg) and phytase supplemented, and inorganic P additions were 75%, 50%, 25% (Ca to P ratio was from 1.35 to 1.63 to 1.00) of the control group, respectively; those in groups 6 to 9 were fed diets with Ca to P ratio maintained 1.25:1.00 and phytase supplemented, and inorganic P additions were 75%, 50%, 25% and 0 of the control group, respectively. The results showed as follows: 1) in normal P level (5.81 g/kg) groups, supplementation of phytase significantly improved the apparent digestibility (AD) of feed dry matter (DM), ash, organic matter (OM) and P (P<0.01), reduced the fecal excretion of P (P<0.01), and tended to decrease copper and zinc excretion (P<0.10). Dietary supplementation of phytase in lower P level than control group significantly improved the AD of feed DM, ash, OM, P, Ca, iron, copper, and zinc (P<0.01), and reduced the fecal excretion of P, Ca, iron, copper, and zinc (P<0.05). 2) Dietary reduction of P level resulted in a linear or quadratic increase in the AD of DM, ash, OM, P, iron, copper, zinc (P<0.05), and a linear or quadratic reduction in fecal excretion of P, iron, copper and zinc under the condition of unchanged Ca level or Ca to P ratio (P<0.05). AD of Ca and crude protein were significantly increased by reducing P level when Ca to TP ratio controlled as 1.25:1.00 (P<0.05). 3) Addition of phytase could replace 0.91 and 1.27 g/kg of inorganic P and reduced fecal P excretion by 24.70% and 34.48% respectively when Ca level was maintained 7.26 g/kg and Ca to P ratio was maintained 1.25:1.00 based on the apparent digestible P. 4) Groups with Ca to P ratio controlled 1.25:1.00 had significantly higher nutrient AD and lower excretion of fecal mineral than groups with Ca level maintained 7.26 g/kg (P<0.01). In summary, the lower the Ca to P ratio (1.25:1.00) and lower inorganic P level, the higher the effect of phytase on nutrient AD in the present study. Supplementation of phytase in diet with Ca to TP ratio maintained 1.25:1.00 can replace 1.27 g/kg inorganic P based on digestible P.

Key words： phytase; inorganic P; Ca; sows; apparent nutrient digestibility

Cite this article

GUO Wenwen, YANG Weiren, GUO Baolin, ZHANG Liang, WEI Maolian, WANG Dehai, ZHAO Lifang . Effects of Different Phosphorus Levels and Calcium to Phosphorus Ratios with Phytase Supplementation on Dietary Nutrients Apparently Digestibility in Pregnant Sows[J]. Chinese Journal of Animal Nutrition, 2015 , 27(3) : 893 -901 . DOI: 10.3969/j.issn.1006-267x.2015.03.029

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