Zhang Yi, Ward Terry Lynn, Ji Fei, Peng Chucai, Zhu Lin, Gong Limin, Dong Bing
State Key Laboratory of Animal Nutrition, China Agricultural University, Beijing 100193, China.
Zinpro Corporation, Eden Prairie, MN 55344, USA.
Asian-Australas J Anim Sci. 2018 Aug;31(8):1267-1274. doi: 10.5713/ajas.17.0739. Epub 2017 Dec 19.
The objective of the study was to investigate the effects of zinc amino acid complex (ZnAA) on growth performance, hematological and biochemical parameters in weanling pigs.
In Exp. 1, a total of 216 Duroc×Landrace×Large White weanling pigs were assigned randomly to 6 dietary treatments. Each treatment had 6 replicates (pens) with 6 pigs each. The diets were corn-soybean meal based with supplementation of 0, 20, 40, 80, 120 mg Zn/kg from ZnAA or 40 mg Zn/kg from feed-grade zinc sulfate. The experiment lasted 42 days. In Exp. 2, a total of 180 weanling pigs were assigned randomly to 3 dietary treatments supplemented with 0, 80, or 800 mg Zn/kg from ZnAA.
In Exp. 1, pigs fed 40 to 80 mg Zn/kg from ZnAA had higher (p<0.05) average daily gain (ADG) than the unsupplemented group during d 0 to 14. During d 0 to 42, the pigs fed 20 to 120 mg Zn/kg from ZnAA had increased (p<0.05) ADG. Pigs fed 20 to 120 mg/kg Zn from ZnAA had lower feed:gain (p<0.05), increased the activity of serum Cu-Zn superoxide dismutase on d 14, and increased serum Zn levels on d 42 (p<0.05). In Exp. 2, pigs fed diets with 800 mg Zn/kg had increased average daily feed intake during d 15 to 28 (p<0.05) compared to the unsupplemented group. During d 0 to 28, the pigs fed supplemental Zn had increased ADG (p<0.05). On d 14 and d 28, pigs fed supplemental Zn had higher the serum alkaline phosphatase activities (p<0.05). No significant differences were observed in the hematological parameters and organ indices.
Supplementation with 20 to 80 mg/kg Zn from ZnAA improved the growth performance in weaned pigs. The piglets can tolerate up to 800 mg/kg Zn from ZnAA with limited potential health effects.
本研究旨在探讨氨基酸锌络合物（ZnAA）对断奶仔猪生长性能、血液学和生化参数的影响。
在实验1中，将总共216头杜洛克×长白×大白断奶仔猪随机分配到6种日粮处理组。每个处理组有6个重复（栏），每个栏6头猪。日粮以玉米-豆粕为基础，分别添加0、20、40、80、120mg/kg来自ZnAA的锌或40mg/kg来自饲料级硫酸锌的锌。实验持续42天。在实验2中，将总共180头断奶仔猪随机分配到3种日粮处理组，分别添加0、80或800mg/kg来自ZnAA的锌。
在实验1中，在第0至14天，饲喂40至80mg/kg来自ZnAA的锌的仔猪平均日增重（ADG）高于未添加组（p<0.05）。在第0至42天，饲喂20至120mg/kg来自ZnAA的锌的仔猪ADG增加（p<0.05）。饲喂20至120mg/kg来自ZnAA的锌的仔猪料重比降低（p<0.05），在第14天血清铜锌超氧化物歧化酶活性增加，在第42天血清锌水平升高（p<0.05）。在实验2中，与未添加组相比，饲喂含800mg/kg锌日粮的仔猪在第15至28天平均日采食量增加（p<0.05）。在第0至28天，饲喂添加锌的仔猪ADG增加（p<0.05）。在第14天和第28天，饲喂添加锌的仔猪血清碱性磷酸酶活性较高（p<0.05）。血液学参数和器官指数未观察到显著差异。
添加20至80mg/kg来自ZnAA的锌可改善断奶仔猪的生长性能。仔猪能耐受高达800mg/kg来自ZnAA的锌，对健康的潜在影响有限。
