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Asian-Australas J Anim Sci > Accepted
doi: https://doi.org/10.5713/ajas.16.0897    [Accepted]
Effect of a Microbial Phytase on Growth Performance, Plasma Parameters and Apparent Ileal Amino Acid Digestibility in Youxian Sheldrake Fed a Low-Phosphorus Corn-Soybean Diet
Shaoping He, Rodolfo Frilles Medrano, Qifang Yu, Yixin Cai, Qiuzhong Dai1, Jianhua He*
College of Animal Science and Technology, Hunan Agricultural University, Changsha, China
1Department of Animal Nutrition and Feed Technology, Animal Husbandry and Veterinary Institute of Hunan Province, Changsha, China
* Corresponding Author: Jianhua He ,Tel: +86-731-84635348, Fax: +86-731-84635348, Email: jianhuahy@hunau.net
Received: November 27, 2016;  Revised: January 11, 2017.  Accepted: February 4, 2017.  Published online February 23, 2017.

ABSTRACT
Objective:
This study investigated the effect of microbial phytase supplementation on growth performance, tibia ash, plasma parameters, apparent ileal digestibility (AID) of amino acid (AA) and apparent digestibility of nutrients in Youxian Sheldrakes fed with low-Phosphorus (P) corn-soybean diets.
Method:
A total of 350 Youxian Sheldrakes (7d old) were randomly divided into 5 treatment groups: positive control (PC) group has adequate available P diet (0.42% and 0.38%, starter and grower), negative control (NC) group were deficient in available P (0.32% and 0.28%, starter and grower) and NC diet was supplemented with 3 levels of microbial phytase (500, 750, and 1000 U/kg).
Results:
Dietary supplementation of phytase in NC diet improved the average daily gain, increased the levels of serum calcium (Ca), tibia Ca and P, AID of AA and apparent digestibility of energy and Ca in starter stage (P < 0.05). There was an increased (P < 0.001) in the utilization of P from 17.3% to 23.9%. Phytase supplementation (1000 U/kg) have shown that the AID of His, Thr, Val, indispensable AA, Glu, Pro and dispensable AA was higher (P < 0.05) than that of NC. Moreover, phytase supplementation improved (P < 0.05) serum and tibia Ca and P, AID of AA and apparent digestibility of dry matter, crude protein, energy, P and Ca, and reduced (P < 0.05) feed to gain ratio (F/G )and the levels of serum alkaline phosphatase (ALP) in grower stage. Likewise, increased (P < 0.001) in the utilization of P was noticed from 12.6% to 17.2%. Supplement phytase 750 U/kg have improved the AID of His, Thr, Asp, Cys, Pro and Ser (P < 0.05).
Conclusion:
The microbial phytase supplement could improve growth performance, AID of some AA and apparent utilization of other nutrients in Youxian Sheldrakes, and reduce excreta P load to environment.
Keywords: Youxian Sheldrake; Phytase; Apparent Nutrient Digestibility; Performance; Apparent Ileal Amino Acid
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