安普霉素对仔猪养分代谢率及氮沉积的影响

Efffct of apramycin on nutrients metabolizablity and nitrogen retention in piglets

20头28日龄大长北三元杂交断奶仔公猪随机分为4组,分别饲养于不同环境温度(28℃、15℃)下的代谢笼内,饲喂含有不同剂量安普霉素(0、90、150mg/kg)的日粮,试验期为2周,后7d进行全收粪代谢试验,观测安普霉素对仔猪物质表观代谢率及氮沉积的影响。研究结果表明,在低温环境下日粮中添加安普霉素可抵御寒冷应激,改善仔猪日粮干物质和蛋白质的表观代谢率,增加机体氮的沉积,其中150mg/kg安普霉素可显著提高仔猪日增重70.5%(P<0.05)、改善饲料转化率32.7%(P<0.05),并能提高采食量、降低发病死亡率。在低温环境下,应适当加大抗生素的添加剂量。

Twenty Large White×Landrace×Beijing Black male piglets weaned at 28 days were randomly divided into 4 groups with 5 piglets each, and were individually housed in plastic-coated metabolism crates under different temperature （28℃ ,15℃ ）. The piglets were fed a basal diet containing 20% crude protein supplemented with apramycin at 0, 90, and 150 mg/kg for a period of 2 weeks. During the last week, metabolic trial was conducted to study the effect of apramycin on the apparent metabolizablity of dry matter and protein and the nitrogen retention of piglets. The results are as follows： Under low temperature condition, dietary apramyein supplementation could effectively alleviate cold stress. The treatments of 90 and 150 mg/kg improved the apparent protein metabolizablity by 26.4%, 18.7% and daily nitrogen retention by 31.7%, 38.4% respectively. Addition of 150mg/kg apramycin significantly increased ADG by 70.5%（P〈0.05） and FCR by 32.7%（P〈 0.05 ）, and markedly decreased the mortality of piglets. Therefore, apramyein dosage should be increased under low temperature environment.