低粗蛋白质补充氨基酸日粮对妊娠母猪繁殖性能和蛋白质代谢的影响

选择胎次、预产期、体重相近的妊娠母猪24头，采用单因子试验设计，随机分为3个处理，每个处理设8个重复。对照组饲喂常规饲料，粗蛋白质（CP）水平为14.5%，试验组Ⅰ和Ⅱ为低CP补充氨基酸日粮，其CP水平分别为12.5%和10.5%。各处理氨基酸水平相同。试验期为从配种后20 d左右确定受孕后开始，直到产仔结束。试验结果表明：①与对照组相比，妊娠母猪采食低CP日粮，对其繁殖性能如总产仔数、活仔数、初生重及背膘厚无显著影响（P>0.05）。②对照组血清尿素氮的含量与试验组Ⅰ差异不显著（P>0.05），而显著高于试验组Ⅱ（P<0.05）。试验组Ⅰ的血清尿素氮的含量与试验组Ⅱ差异显著（P<0.05）。血糖含量随CP水平的降低有下降的趋势，对照组血糖含量与试验组Ⅰ差异不显著（P>0.05），而与试验组Ⅱ差异显著（P<0.05）；试验组Ⅰ和Ⅱ血糖含量差异不显著（P>0.05）。③饲料CP的表观消化率随着CP的降低有上升的趋势，试验组Ⅰ与对照组相比差异不显著（P>0.05），而试验组Ⅱ显著高于试验组Ⅰ和对照组（P<0.05）。综上所述，妊娠母猪采食低CP补充氨基酸日粮，对其繁殖性能及背膘厚无显著影响。

Effect of Low Crude Protein Diet Supplemented with Amino Acids on Reproductive Performance and Protein Metabolism in Pregnant Sows

In order to study the effect of low crude protein (CP) diet supplemented with amino acids on the reproductive performance and protein metabolism in pregnant sows, a single-factor experimental design was used and twenty-four pregnant sows were randomly divided into three treatments with 8 replicas each according to parity,due date and body weight of sows. The pregnant sows in control group were fed conventional feed with CP level of 14.5%, and the pigs in experimental groups Ⅰ and Ⅱ were fed 12.5% and 10.5% of CP diets supplemented with amino acids,respectively. All diets contain similar amino acid concentration. The experiment began at 20 days after breeding and finished after farrowing. The results showed that:① Low CP diets supplemented with amino acids had no significant effect on the reproductive performance of sows,including the total litter size,number of live litter size,weight at birth and backfat thickness of sows (P>0.05).② The serum urea nitrogen of sows in the control group had no significant difference with experimental group Ⅰ (P>0.05),while significantly higher than experimental group Ⅱ (P<0.05).And there was no significant difference between experimental group Ⅰ and Ⅱ (P>0.05). Serum glucose content also had a downward trend with the decrease of CP level,and that of the control group had no significant difference with experimental group Ⅰ (P>0.05),while significantly higher than experimental group Ⅱ (P<0.05).There was no significant difference between experimental group Ⅰ and Ⅱ (P>0.05). ③ Apparent digestibility of CP showed a trend of increase with the decrease of dietary CP levels. CP apparent digestibility of experimental group Ⅰ had no significant difference with control group (P>0.05),while that of experimental groupⅡ was significant higher than other two group (P<0.05).In conclusion,the low CP diet supplemented with amino acids had no significant effects on the reproductive performance and backfat thickness in pregnant sows.