HMBi对生绒期辽宁绒山羊氮、硫代谢的影响

Effect of HMBi on nitrogen and sulfur metabolism in Liaoning cashmere goats during cashmere growing period

试验研究不同水平HMBi对生绒期辽宁绒山羊氮、硫代谢的影响。采用4×4拉丁方设计,选择4只辽宁绒山羊羯羊为试验动物,配制HMBi水平为0%(对照日粮)、0.85%(试验日粮A)、1.27%(试验日粮B)、1.70%(试验日粮C)的4种日粮,试验分4个时期进行。试验期每日收集粪、尿,测定其中的氮、硫。试验结果显示,生绒期辽宁绒山羊日粮中添加HMBi能显著减少粪氮和尿氮,增加沉积氮和可消化氮(P<0.05);添加HMBi粪硫和尿硫显著增加,但可消化硫、沉积硫亦显著增加(P<0.05);添加HMBi能显著提高氮、硫的表观消化率、总利用率及生物学价值(P<0.05)。综合分析认为,生绒期辽宁绒山羊日粮中HMBi的适宜添加量为1.27%。

This experiment was conducted to study the effect of HMBi on Nitrogen＆Sulfur Metabolism in Liaoning cashmere goats during cashmere growing period. In a 4×4 Latin-square experiment design, four wether Liaoning cashmere goats were selected, fed one of diets formulated with HMBi 0% （Control diet）, 0.85% （Experimental diet A）, 1.27% （Experimental diet B）, 1.70% （Experimental diet C） respectively in four stages. Fecal and urine were collected every day and nitrogen and sulfur content were. determined. The results showed that： HMBi decreased fecal nitrogen and urine nitrogen and increased retained nitrogen and digestible nitrogen significantly （P〈0.05）, and increased fecal sulfur, urine sulfur, digestible sulfur and retained sulfur （P〈0.05）; HMBi increased apparent digestibility, total utilization ratio and biological value of nitrogen and sulfur （P〈0.05）. The findings indicate that the optimum dietary HMBi level is 1.27 % in Liaoning cashmere goats during cashmere growing period.