能量摄入水平对放牧绒山羊养分消化和产绒性能的影响

试验旨在研究生绒旺盛期内不同能量摄入水平对放牧绒山羊养分消化和产绒性能的影响。选用28只3周岁体重和上年度产绒量相近的内蒙古白绒山羊羯羊,随机分为4组,每组7个重复。试验于绒生长旺盛期(2006年9—11月)进行,羊群白天放牧,晚上归牧后对试验1、2、3组分别补饲3种不同能量水平(1.62、3.16MJ/kg和4.58MJ/kg)的日粮,对照组不补饲。换算成全日粮后,对照组和试验1、2、3组的代谢能摄入量分别为714.99、758.32、834.24、904.56KJ/(kgW0.75·d)。结果表明:提高能量摄入水平对干物质消化率有显著影响(P<0.05);不同能量摄入对产绒量、绒厚度、绒伸直长度、绒占被毛总重比例和净绒率的影响不显著(P>0.05),提高能量摄入使绒细度有增粗的趋势,试验2组显著粗于其他组(P<0.05)。

Effects of Different Energy Levels of Diet on the Nutrients Digestibility and Cashmere Production of Pastured Cashmere Goats

To study the effects of different energy levels intake on the nutrients digestibility and cashmere production of pastured cashmere goats in the cashmere fast-growing period, 28 three-years-old Inner Mongolia white cashmere goats (IMWCG), with similar body weight (47.57 ±0.68) kg and yield of cashmere were divided into four groups. One was control, the other three groups were trial groups. The goats were grazed on pastureland in daytime, the trial groups were supplemented different energy levels of diet (1.62, 3.16, 4.58 MJ/kg), and the contol was given nothing after grazing. During the whole period average metabolic energy intakes (MEI)of the control and the trial groups were 714.99, 758.32, 834.24 and 904.56 KJ(/kg W0.75·d), respectively. The results showed, with different energy levels intake, the average digestibility of DM was significant (P < 0.05). Diet of the cashmeres which were mated in different energy levels got a significant value(P < 0.05). Yield of cashmere, cashmere strenghth length, net cashmere rate and weight ratio of cashmere to hair were not significant among groups (P > 0.05).