The impact of the interaction between dietary total phosphorus level and efficacy of phytase on the performance of growing-finishing pigs

文献类型： 外文期刊

第一作者： Cao, S. C.

作者： Cao, S. C.;Gong, J.;Wang, J.;Yan, H. L.;Liu, J. B.;Cao, S. C.;Zhang, H. F.;Liu, J. B.;Yan, H. L.;Liu, J. B.

作者机构：

关键词： Phytase; Phosphorus; Growing -finishing pigs

期刊名称：ANIMAL FEED SCIENCE AND TECHNOLOGY （ 影响因子：3.2； 五年影响因子：3.6 ）

ISSN： 0377-8401

年卷期： 2023 年 298 卷

页码：

收录情况： SCI

摘要： Two experiments were conducted to investigate the interaction between dietary total phosphorus (P) level and phytase on the performance of growing-finishing pigs. In experiment 1, a total of 96 growing pigs [Duroc x Landrace x Yorkshire (barrows, initial body weight (BW) = 39.1 +/- 0.5 kg), 8 pigs per treatment] were used in a 5-d total fecal and urine collection study to determine the apparent total tract digestible (ATTD) P release value of phytase in 2 dietary standardized total tract digestible (STTD) P levels (1.49 vs 2.87 g/kg of STTD P) with 0, 250, 500, 750, 1000, and 1250 FTU/kg of phytase. The results indicated that there was an interaction between P level and phytase in the determination of coefficient of apparent total tract digestibility of P (P < 0.01). The determined P release curves were STTD P = -1.4 phytase2 x 10-6 + 20.8305 phytase x 10-3 + 6.88392 x 10-2, R2 = 0.9766 [1] in low-P diets, and STTD P = -1.2 phytase2 x 10-6 + 20.2754 phytase x 10-3 + 1.86325 x 10-2, R2 = 0.9965 [2] in high-P diets. In experiment 2, a total of 1344 growing pigs [Duroc x Landrace x Yorkshire (initial BW = 69.4 +/- 0.6 kg), 28 pigs per pen] were used in a 35-d growth performance study. The study had 4 dietary treatments which included low-P (1.0 g/kg of STTD P) diet group, high-P (1.9 g/kg of STTD P) diet group, low-P diet + 1100 FTU/kg phytase group, and high-P diet + 250 FTU/kg phytase group. The two treatments with phytase were formulated to the same STTD P level using the P release value of phytase determined by equation [1] from Experiment 1. The results showed that the treatment with 1100 FTU/kg phytase had greater gain to feed ratio compared to the treatment with 250 FTU/kg phytase, 1.0 g/kg total STTD P group and 1.9 g/kg total STTD P group (P < 0.05). In conclusion, the determination of P release of phytase may be impacted by the total P level in the diet. The P release value determined in low-P diets may not be accurate for the diet formulation when dietary total P level is greater.

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