乳铁蛋白对早期断奶仔猪养分利用率及相关血液生化指标的影响

 论文旨在研究日粮中添加不同水平乳铁蛋白（lactoferrin，Lf）对早期断奶仔猪养分利用率、血清营养生化指标及血清酶活性指标的影响。采用单因素试验设计，选用21日龄断奶仔猪96头，随机分为4个处理，每个处理4个重复，每个重复6头仔猪，分别在基础饲粮中添加0、250、500和750  mg/kg乳铁蛋白。试验为期21 d。结果表明：添加乳铁蛋白有提高断奶仔猪干物质消化率的趋势（P＞0.05），其中500 mg/kg添加组最高。 250 mg/kg、750 mg/kg组与对照组相比能显著提高粗灰分消化率（P＜0.05）；750 mg/kg乳铁蛋白组血清中尿素氮和总胆固醇的含量显著低于对照组（P＜0.05），各乳铁蛋白添加组血清中总蛋白水平有提高的趋势（P＞0.05）；各乳铁蛋白添加组血清中谷丙转氨酶、谷草转氨酶、碱性磷酸酶、乳酸脱氢酶的活性与对照组差异不显著（P＞0.05）。综合试验结果与经济效益，本试验条件下日粮中添加500 mg/kg乳铁蛋白为最适添加量。 

Influence of Lactoferrin on Nutrient Utilization Efficiency and Related Blood Biochemical Parameters of Early Weaned Piglets

The experiment was conducted to investigate the effects of supplemental lactoferrin in weaning piglets basal diet on nutrient digestibility,biochemical indicators of nutrition in serum,enzymes activity in serum.Ninety-six weaning piglets at 21-day-old were randomly allocated to 4 treatments with 4 replicates of 6 piglets per replicate.Each treatment was fed basal diet supplemented with 0、250、500 and 750 mg/kg lactoferrin respectively.The experimental period was 21 days.The results showed: basal diets supplied with lactoferrin had the trend of increasing digestibility of dry matter in weaned piglets(P>0.05),and the adding with 500 mg/kg lactoferrin group was the best.Compared with the control group,supplementing 250 mg/kg and 750 mg/kg lactoferrin could significantly increase digestibility of crude ash(P<0.05).Compared with the control group,supplementing 750 mg/kg could significantly reduce the content of serum urea nitrogen and total cholesterol(P<0.05),which had the trend of improving the total protein content(P>0.05).Each supplemented group had no significant difference in ALT,AST,ALP and LDH in the serum(P>0.05).Comprehensive consideration of the test results and economic benefits,the optimal supplemental amount of LF is 500mg/kg in this experimental condition.