【摘要】 选择3月龄断奶、平均体质量(19.22±1.20)kg的雄性细毛羊48只,随机分为3组,分别为对照组、试验一组、试验二组;对照组饲喂精料、青贮玉米、苜蓿和芦苇组成的基础日粮,试验一组饲喂由棉籽壳替代50%芦苇的日粮,试验二组饲喂由棉籽壳替代100%芦苇的日粮,进行为期8个月的饲养试验,并分别在5、7、9、11月龄时每组屠宰试验羊3只,共计36(3×3×4)只,按常规方法进行胴体分割,测定相关指标,研究棉籽壳对雄性细毛羊生长性能及组织中棉酚残留的影响.饲养试验表明,平均日增质量组间差异不显著(P>0.05);屠宰试验揭示,屠宰率和净肉率组间差异不显著(P>0.05),胴体质量和净肉质量随日龄增长有增加趋势,在11月龄时达到显著水平,即试验一组的胴体质量和净肉质量分别比对照组提高了13.4%(P<0.05)和13.6%(P<0.05),试验二组的胴体质量和净肉质量分别比对照组提高24.2%(P<0.05)和24.4%(P<0.05);体组织棉酚残留量显示,随着棉籽壳量的增加及时间的延长,试验羊组织中棉酚残留量均呈上升趋势,棉酚在体内的蓄积分布具有不同的组织亲和性,其残留量由高到低依次为:睾丸>肝脏>肾脏>脾脏>背长肌>臀肌.上述结果提示:一定比例的棉籽壳可安全有效地作为雄性细毛羊的饲料;睾丸棉酚含量可作为棉酚中毒状况的监测指标.更多还原

【Abstract】 Forty-eight fine-wool,weanling male sheep aged 3 months with average body mass of (19.22±1.20) kg were randomly divided into three groups,which were fed with the basal diet consisted of concentrated feed,silage maize,alfalfa and reed (control group),and the basal diet with the cottonseed hull replacing 50% reed (group 1) and 100% reed (group 2),respectively.The effects of dietary cottonseed hull on growth performance and gossypol residues in tissue of fine-wool male sheep were investigated for 8 months.During the period of experiment,three sheep of each group were slaughtered humanly to collect tissue samples in 5,7,9,11-month-old,respectively.The results showed that no significant differences in average daily gain,slaughter ratio and pure mutton ratio were observed between control and cottonseed hull-exposed treatment (P>0.05).Compared with control group,carcass and pure mutton mass of group 1 increased by 13.4%(P<0.05) and 13.6%(P<0.05) respectively in 11-month-old,so did group 2 increased by 24.2%(P<0.05) and 24.4%(P<0.05) respectively.Moreover,gossypol residues in the tissues of sheep increased with the increase of dietary cottonseed hull contents and the prolongation of exposed period.Gossypol accumulated in sampled tissues was the order as follows:testis> liver> kidney> spleen> longest dorsal muscle> gluteal.The results above indicate that suitable cottonseed hull can be used as a feed safely,and the residues of gossypol in testicular tissue can be used as monitoring indicators of gossypol poisoning.更多还原