摘要
选用16头18月龄,体况良好,体重380±17kg的西门塔尔牛育成母牛,采用完全随机区组设计,研究日粮添加赖氨酸铜(0、8、16和24mgCu/kgDM)对发情周期生殖激素分泌规律的影响。结果表明:8mg/kg组和16mg/kg组显著提高了发情周期LH、FSH、P4和E2水平(P<0.05);24mg/kg组有提高趋势,但与对照组比差异不显著(P>0.05)。说明添加赖氨酸铜8～16mgCu/kgDM对发情周期生殖激素分泌有促进作用,以8mgCu/kgDM较佳。兼顾基础日粮含铜量,建议日粮铜水平为:13.87mgCu/kgDM。
Sixteen Simmental heifers （average BW 380kg, aged 18 monthes） consuming a corn straw diet were chosen and allocated into four treatments and supplemented with four levels （0, 8, 16 and 24 mgCu/ kg of DM） of supplemental copper lysine to evaluate the effects of copper on reproductive hormone excretion during the oestrous cycle. The results showed that serum estradiol, luteinizing-hormone, follicle- stimulating hormone and progesterone concentrations were increased significantly （P〈0.05） by supplemental copper lysine at 8-16 mgCu/kg of DM than control group. Serum estradiol, estriol, luteinizing-hormone, follicle-stimulating hormone and progesterone concentrations were increased by supplemental copper at 24 mgCu/kg of DM, but no significant difference with control （P〉0.05）. The results suggested that copper lysine had positive effects on reproductive hormone during estrus cycle by supplemental copper at 8 mgCu/ kg of DM. Considering the copper content of basal diet; the optimum copper level of diet is 13.87 mgCu/kg DM.
出处
《中国农学通报》
CSCD
2006年第10期7-12,共6页
Chinese Agricultural Science Bulletin
基金
国家科技成果转化项目"高效无公害奶牛饲料中试科研"资助(02EFN211401036)
山西农业大学青年基金项目"牛羊铜营养的研究"(200108)
关键词
西门塔尔牛
赖氨酸铜
发情周期
生殖激素
Copper lysine, Estrous cycle, Reproductive hormone, Simmental heifer
