不同蛋白质水平饲粮对生长期云上黑山羊能量代谢的影响

为研究不同蛋白质水平饲粮对生长期云上黑山羊能量代谢的影响,选取21只体况良好、体重44.84 kg±2.79 kg的处于生长期的云上黑山羊公羊,随机分为3组,每组7个重复,分别饲喂蛋白质水平为9.80%、11.61%和12.66%的3种不同饲粮。所有试验羊进行44 d的饲养试验(预饲期14 d,正试期30 d),在正试期的第12~17天,从3个试验组中各选择健康、体重相近的5只羊进行消化代谢试验。结果表明:①12.66%蛋白质水平组干物质采食量和摄入总能均显著高于9.80%蛋白质水平组和11.61%蛋白质水平组(P<0.05)。②粪能排泄量11.61%蛋白质水平组最低,且显著低于12.66%蛋白质水平组(P<0.05)。③DE、UE、ECH4、ME和NEp三个蛋白质水平组之间差异均不显著(P>0.05)。④总能消化率、总能代谢率3个蛋白质水平组之间差异均不显著(P>0.05);11.61%蛋白质水平组消化能代谢率显著高于12.66%蛋白质水平组(P<0.05)。⑤生长期云上黑山羊的组织和器官能量3个蛋白质水平组之间差异均不显著(P>0.05);除9.80%蛋白质水平组大肠能量显著高于11.61%蛋白质水平组外(P<0.05),其他胃及肠道能量3个蛋白质水平组之间差异均不显著(P>0.05)。综上,说明不同蛋白质水平对云上黑山羊GE、FE、ME/DE有显著影响,饲粮蛋白质水平为11.61%时能量利用率最佳。

Effects of Different Dietary Protein Levels on Energy Metabolism of Yunshang Black Goats in the Growth Period

This study aimed to investigate the effects of different dietary protein levels on energy metabolism of Yunshang Black goats in the growth period. 21 healthy male Yunshang Black goats with initial body weight of 44.84 kg±2.79 kg were randomly assigned to 3 groups with 7 replicates in each group.Goats in different groups were fed diets of protein levels of 9.80%,11.61%and 12.66% respectively.The feeding experiment lasted for 44 days(per-trial period 14 d,trial period 30 d),on the 12 th to 17 th day of the trial period,5 healthy sheep with similar body weight were selected from each of the three experimental groups for digestion and metabolism test.The results showed as follows:①The dry matter intake and total energy intake in the 12.66% protein level group were significantly higher than those in the 9.80% protein level group and 11.61% protein level group(P<0.05).②Fecal excretion in the 11.61% protein level group was the lowest,and significantly lower than the 12.66% protein level group(P<0.05).③There were no significant differences among the three protein levels of DE,UE,ECH4,ME,MEm and NEp(P >0.05).④There were no significant differences in the total energy digestibility and total energy metabolism between the three protein levels(P >0.05);the 11.61% protein level group had significantly higher digestible energy metabolic rate than the 12.66% protein level group(P<0.05). ⑤ There were no significant differences in tissue and organ energy between the three protein levels(P >0.05);except the colorectal energy was significantly higher in the9.80% protein level group than in the 11.61% protein level group(P<0.05),no significant differences were found in gastric and intestinal energy among groups(P >0.05). In conclusion: under the condition of this experiment,different protein levels have a significant effect on the GE,FE,ME/DE of Yunshang Black goats,when the protein level of the diet is 12.66%,the deposition energy is the highest,the energy utilization rate is the best when the protein level is 11.61%.