The Effect of Dietary Supplementation with Phytase Transgenic Corn on Growth Performance, Phosphorus Utilization and Excretion in Growing Pigs ( Sus scrofa)

• Published in: Agricultural sciences in China 2011-05, Vol.10 (5), p.769-776
• Main Authors: WANG, Xiu-qi, WANG, Sheng, ZHANG, Jun-min, YANG, Jing-pei
• Format: Article
• Language: English
• Subjects: average daily gain; barrows; blood serum; calcium; corn; digestibility; excretion; feces; feed intake; feed supplements; growing pigs; growth performance; Large White; nutrient apparent digestibility; nutrient utilization; phosphorus; phosphorus excretion; phytase transgenic corn; phytases; soybean meal; soybeans; Sus scrofa; swine feeding; transgenic plants
• ISSN: 1671-2927
• DOI: 10.1016/S1671-2927(11)60061-8

Two experiments were conducted to investigate the effect of dietary supplementation with phytase transgenic corn (PTC) on growth performance, phosphorus (P) utilization and excretion in growing pigs. In Exp. 1, 180 pigs (Large White ×Landrace, BW=37.7 kg) were randomly allotted to 4 treatments with 5 replicates of 9 pigs each in order to evaluate the effect of PTC supplementation in low-P diets on growth performance. Four corn soybean meal-based diets consisted of a positive control (PC) diet, a diet containing 500 units (U) of exogenous phytase kg −1 (EP) on the basis of low-P (inorganic P reduced by 0.05% from PC diet) and the low-P+500 (PTC1) or 750 (PTC2) phytase U of PTC kg −1. In Exp. 2, 20 barrows (Large White×Landrace, BW=31 kg, 4 treatments with 5 replicates of 1 pig each) were randomly selected to evaluate the effect of PTC in low-P diets on serum parameters and nutrient utilization. Diets in Exp. 2 were similar to those in Exp. 1 except that the EP group was replaced by a low-P diet without exogenous phytase supplementation as a negative control (NC) group. The results from Exp. 1 showed that the average daily gain (ADG) in the PTC2 group was significantly higher ( P