摘要
以利木赞×鲁西黄牛杂交一代公牛为研究对象,应用永久性瘤胃瘘管和颈静脉插管技术,研究了日粮钼、铜水平对肉牛营养物质代谢、铜的生物学利用率和需要量的影响。试验根据2个日粮钼水平(0.225和5.225 mg/kg)分2阶段进行,每个日粮钼水平设3个铜水平(11.71、26.71和51.71 mg/kg),采用拉丁方试验设计。研究结果表明:提高日粮钼水平能显著降低肉牛血铜水平、血清铜蓝蛋白和SOD活性(P<0.01);提高日粮铜水平可提高肉牛血铜质量比、血清铜蓝蛋白和SOD活性、ADF瘤胃消失率(P<0.01)。5.225 mg/kg日粮钼能降低铜的生物学利用率,日粮中补充铜能提高铜的生物学利用率(P<0.05)。肉牛日粮钼质量比为0.225和5.225 mg/kg时,相应日粮铜的适宜供给量为11.71和26.71 mg/kg。
Crossbred （Limousin × Lu-xi） beef cattle, fitted with permanent cannulas in rumen, and intubatton in jugular vein, was used in the study. The experiments were divided into two stages according to two levels of molybdenum （0.225 and 5.225 mg/kg）, each level had three concentrations of dietary copper （11.71,26.71 and 51.7 mg/kg）, A Latin square design was used to determine the effects of dietary copper or molybdenum on the metabolism of nutrients, bioavailability and requirement of copper in beef cattle. The results indicated that plasma copper concentration and activities of Cp or SOD reduced （P〈 0.01） with increasing dietary molybdenum. Copper supplemented cattle had greater （P〈 0.01） plasma copper concentration, activities of Cp or SOD, and disappearance rate of ADF in rumen. Supplement of 5 mg/kg of Mo in diet decreased （P 〈 0.05） the bioavailability of copper. Copper supplementation increased （P 〈 0.05） the bioavailability of copper. It was suggested that the optimal requirements for copper were 11.71 mg/kg and 26.71 mg/kg for cattle fed diets supplemented with 0.225 and 5.225 m/kg g of Mo.
出处
《中国农业大学学报》
CAS
CSCD
北大核心
2007年第2期45-49,共5页
Journal of China Agricultural University
基金
"十五"国家科技攻关计划资助项目(2002BA514A-2-1)
关键词
肉牛
钼
铜
血铜
血清铜蓝蛋白
SOD
需要量
beef cattle
molybdenum
copper
plasma copper
ceruloplasmin
SOD
requirement
