动物营养学报2018，Vol.30Issue(5)：1760-1770,11.DOI:10.3969/j.issn.1006-267x.2018.05.018
陕北白绒山羊断奶羔羊微量元素需求量
Trace Element Requirements of Weaned Lambs of Shaanbei White Cashmere Goats
摘要
Abstract
This study was conducted to evaluate effects of different levels of dietary trace elements on perform-ance, nutrients digestion and metabolism, trace element deposition in tissues of weaned lambs of Shaanbei white cashmere goats. Twenty-four 6-month old weaned lambs of Shaanbei cashmere goats with about 20 kg of body weight were selected and randomly assigned to four groups, each group had three replicates, and each replicate had 2 lambs. The goats in different groups were fed diets containing different trace elements levels. In group Ⅰ, iron, copper, zinc, manganese and cobalt contents in diet were 279.30,15.35,63.41,68.51 and 0.22 mg/kg, respectively,in groupⅡ,those were 290.14,18.19,81.62 and 94.10 mg/kg,respectively,in group Ⅲ, those were 302.23, 28.20, 103.28, 133.85 and 0.43 mg/kg, respectively, in group Ⅳ, those were 319.74,31.60,126.64,167.07 and 0.67 mg/kg, respectively. The feeding trial lasted for 65 d inclu-ding 5 d of pre-test period and 60 d of test period. On day 30 of test period in feeding trial, one lamb from each repeat was selected and fed individually in cage to carry out digestion and metabolism test. The pre-test pe-riod was 7 d, and the test was 7 d. At the last day of feeding trial, the rest 12 lambs were slaughtered to col-lected heart, liver, spleen, kidney and the longissimus dorsi, and trace element deposition were determined. The results showed as follows:1)average daily gain and feed to gain ratio in group Ⅱ were significantly high-er or lower than those in groupⅠ(P<0.05),and had no significant difference with those in groups Ⅲ and Ⅳ(P>0.05);dry matter intake in group Ⅱ was significantly higher than that in the other groups(P<0.05). 2) Fecal energy and urine energy in groupsⅠandⅡwere significantly lower than those in groups Ⅲ andⅣ(P<0.05), and gross energy digestibility was significantly higher than that in groups ⅢandⅣ(P<0.05). 3)Ni-trogen retention rate, nitrogen intake, digestible nitrogen and retention nitrogen in group Ⅲ were the highest, and were significantly higher than those in groupsⅠand Ⅳ(P<0.05),but had no significant differences com-pared with group Ⅱ(P>0.05). 4)With the increase of supplemental levels of trace elements,apparent meta-bolic rate of trace elements were firstly increased and then decreased, and apparent metabolic rates of iron, copper, zinc, manganese and cobalt in group Ⅱ were the highest. 5)Group Ⅱ had the highest manganese deposition rate in longissimus dorsi and heart, and the highest iron, iodine, copper and manganese deposition in liver;in spleen,iron deposition in groupⅡ was the highest,iodine deposition in group Ⅳ was the highest;in kidney, zinc deposition in group Ⅱwas the highest,and iodine deposition in group Ⅰwas the highest. Un-der the conditions in the present study, the optimal combination of trace element requirements for Shaanbei white cashmere goats were as follows: iron 290.14 mg/kg, copper 18.19 mg/kg, zinc 81.62 mg/k, manga-nese 94.10 mg/kg and cobalt 0.31 mg/kg.关键词
陕北白绒山羊/微量元素/生产性能/组织沉积Key words
Shaanbei white cashmere goats/trace elements/performance/tissue deposition分类
农业科技引用本文复制引用
周广琛,王浩,林昌龙,陈玉林,杨雨鑫..陕北白绒山羊断奶羔羊微量元素需求量[J].动物营养学报,2018,30(5):1760-1770,11.基金项目
国家绒毛用羊产业技术体系(CARS-39-12) （CARS-39-12）
公益性行业(农业)科研专项(201303059) （农业）
陕西省科技攻关项目(2014K01-17-04) （2014K01-17-04）
