Effects of low protein diets supplemented with different amino acids on growth performance,serum biochemical indices,nutrient apparent digestibility,and nitrogen emission of finishing pigs
This experiment was conducted to investigate the effects of low protein diet supplemented with different amino acids on the growth performance,serum biochemical indices,nutrient apparent digestibility,and nitrogen emission of finishing pigs.A total of 120'Duroc × Landrace × Yorkshire'finishing pigs with a body weight of about 75 kg were randomly divided into three treatments with four replicates per treatment and 10 pigs per replicate.The pigs in control group were fed a diet with 13.45％CP level,and the pigs in trial group Ⅰ and group Ⅱ were fed a diet with 10.41％CP level.The pigs in trial group Ⅰ were fed four amino acids(lysine,methionine,tryptophan,and threonine),and the pigss in trial group Ⅱ were fed six amino acids(lysine,methionine,tryptophan,threonine,valine,and isoleucine).The experiment lasted for 28 days.The results showed that compared with the control group,the average daily feed intake and average daily gain in trial group Ⅰ were significantly decreased(P＜0.05),while the daily feed intake and daily gain in trial group Ⅱ were lower than those in control group(P＞0.05).The content of serum urea nitrogen in experimental group Ⅰand group Ⅱ was significantly decreased(P＜0.05).There were no significant differences in the apparent digestibility of nutrients in all groups(P＞0.05).Nitrogen intake,urinary nitrogen emission and total nitrogen emission in trial group Ⅰand group Ⅱ were significantly decreased(P＜0.05),the fecal nitrogen emission was decreased,nitrogen deposition rate and nitrogen apparent biological value were increased in trial group Ⅰ and group Ⅱ(P＞0.05).The study indicates that a low protein diet(CP=10.41％)supplemented with six kinds of amino acids has no negative effect on growth performance of finishing pigs,and can effectively reduce nitrogen emissions.
low protein dietfinishing pigsgrowth performancenitrogen emission
国家科技期刊平台
NSTL
万方数据
