动物营养学报2018，Vol.30Issue(6)：2202-2208,7.DOI:10.3969/j.issn.1006-267x.2018.06.023
饲粮锌水平对生绒期陕北白绒山羊生长性能、产绒性能及绒生长相关激素含量的影响
Effects of Dietary Zinc Level on Growth Performance, Cashmere Performance and Cashmere Growth-Related Hormone Contents of Shanbei White Cashmere Goats during Cashmere Growing Period
摘要
Abstract
This experiment was conducted to study the effects of dietary zinc level on growth performance, cashmere performance and cashmere growth-related hormone contents of Shanbei white cashmere goats during cashmere growing period, in order to determine the optimal dietary zinc level of Shanbei white cashmere goats during cashmere growing period. The experiment was designed in a single factor random block. Thirty-two Shanbei white cashmere goats at 8 months of age with physical fitness and similar weight were selected and di-vided into 4 groups with 4 replicates per group and 2 goats per replicate. The goats in control group ( groupⅠ) were fed a basal diet containing 28.57 mg/kg DM zinc, and the goats in experimental groups ( groups Ⅱ, Ⅲand Ⅳ) were fed the basal diet supplemented with zinc sulfate ( feed grade) , and the dietary zinc level of the experimental diets was 50, 70 and 100 mg/kg DM respectively. The pre-test period was 15 days and the formal test period was 6 months. The results showed as follows: 1 ) dietary zinc level had no significant influences on dry matter intake ( DMI ) and feed / gain ( F / G ) of Shanbei white cashmere goats ( P>0 . 05 ) . Goats in group Ⅲ had the greatest average daily gain ( ADG ) , and the ADG in group Ⅲ had significant difference compared with groupⅠ ( P<0.05) , while had no significant difference compared with groupsⅡ andⅣ ( P>0.05) . 2) Dietary zinc level had no significant influences on cashmere diameter at initial experiment and last experiment and cashmere production ( P>0.05) . Cashmere length in groupⅢwas significantly higher than that in group Ⅰ (P<0.05). Cashmere length at last experiment in group Ⅳ was significantly higher than that in groups Ⅲ and Ⅱ ( P<0.01 and P<0.05, respectively) . Cashmere growth and cashmere growth rate in groupⅢ were significantly higher than those in groups Ⅰ and Ⅳ ( P<0.05) , and no significant difference was ob-served between groups Ⅲ and Ⅱ ( P>0.05) . 3) With the succession of cashmere growing period, melatonin ( MT) , insulin like growth factor-1 ( IGF-1) and growth hormone ( GH) contents in serum of goats showed increasing trend, and serum prolactin ( PRL) content was showed decreasing trend. Dietary zinc level had no significant influences on serum MT and PRL contents in the whole experiment period and GH content in the mid-term experiment ( P>0.05) . Serum IGF-1 content in the mid-term experiment in groupⅢwas significant-ly higher than that in groupⅣ( P<0.05) . Serum IGF-1 content in the last experiment in groupⅢwas signifi-cantly higher than that in groups Ⅰ and Ⅳ (P<0.05). Serum GH content in the last experiment in group Ⅲwas significantly higher than that in group Ⅰ ( P<0.05) . In summary, the optimal dietary zinc level of Shan-bei white cashmere goats during cashmere growing period is 70 mg/kg DM.关键词
饲粮锌水平/陕北白绒山羊/产绒性能/激素Key words
dietary zinc level/Shanbei white cashmere goats/cashmere performance/hormone分类
农业科技引用本文复制引用
白玉恒,王荣斌,刘锦旺,胡飞飞,杨钊,高玉平,屈雷,黄帅,陈玉林..饲粮锌水平对生绒期陕北白绒山羊生长性能、产绒性能及绒生长相关激素含量的影响[J].动物营养学报,2018,30(6):2202-2208,7.基金项目
陕西省重点研发计划项目(2017NY-078) （2017NY-078）
榆林市科技计划项目(2016cxy-06) （2016cxy-06）
榆林学院高层次人才科研启动项目(16GK05) （16GK05）
陕西省科技统筹创新工程计划项目(2015KTTSNY04-05) （2015KTTSNY04-05）
