摘要
选用16头18月龄、体况良好、体重380_4-16kg的西门塔尔牛育成母牛，采用完全随机区组设计分为4组，以包被硒为硒源研究日粮添加硒（0mg·kg^-1、0．3mg·kg^-1、0．6mg·kg^-1和0．9mg·kg^-1）对发情周期生殖激素分泌规律的影响。结果表明：0．3mg·kg^-1和0．6mg·kg^-1。处理组牛发情周期促黄体素平均值显著高于0．9mg·kg^-1。和对照组，0．9mg·kg^-1处理组显著高于对照组（P〈0．05）；发情后12h、第10d、第16d出现3个高峰，0．3mg·kg^-1和0．6mg·kg^-1组的峰值均显著高于0．9mg·kg^-1和对照组。0．3mg·kg^-1和0．6mg·kg^-1组发情周期促卵泡素平均值显著高于0．9mg·kg^-1和对照组，0．9mg·kg^-1处理组显著高于对照组（P〈0．05）；第8d、第12d、第15d出现3个峰值，0．3mg·kg^-1和0．6mg·kg^-1。组的峰值显著高于0．9mg·kg^-1和对照组（P〈0．05）。0．3mg·kg^-1和0．6mg·kg^-1组发情周期孕酮平均值显著高于0．9mg·kg^-1和对照组，0．9mg·kg^-1处理组显著高于对照组（P〈0．05）；发情周期1～7d平均较低，8～15d含量增加，形成台状峰，0．3mg·kg^-1和0．6mg·kg^-1组的峰值显著高于0．9mg·kg^-1和对照组。0．3mg·kg^-1和0．6mg·kg^-1组发情周期雌二醇平均值显著高于0．9mg·kg^-1和对照组，0．9mg·kg^-1处理组显著高于对照组（P〈0．05）；发情后12h、发情周期第5～8d出现高峰，0．3mg·kg^-1和0．6mg·kg^-1组的峰值显著高于0．9mg·kg^-1和对照组，0．9mg·kg^-1处理组显著高于对照组（P〈0．05）。以包被硒为硒源时添加硒0．3—0．6mg·kg^-1对发情周期生殖激素分泌有显著促进作用，以0．6mg·kg^-1为佳，兼顾基础日粮含硒量，建议以包被硒为硒源时日粮硒水平为0．67mg·kg^-1。
Sixteen Simmental heifers （with average bodyweight of 380kg and aged 1.5 years） on corn-straw diet were chosen and grouped into four treatments. The four groups of Simmental heifers were put on four levels （0mg·kg^-1 , 0.3 mg·kg^-1 , 0.6mg·kg^-1 and 0.9mg·kg^-1） of supplemental rumen by-pass selenium to evaluate the effects of selenium on reproductive hormone excretion during estrous cycle. The results show a significantly higher serum Luteinizing-Hormone （LH） concentration in heifer groups supplemented with 0.3 mg·kg^-1 and 0.6 mg·kg^-1rumen by-pass selenium than heifer group on 0.9 mg·kg^-1 and the control （P 〈 0.05 ） , and the 0.9 mg·kg^-1 group is in turn significantly higher than the control （P 〈 0.05 ）. Serum luteinizinghormone concentration peaks appear at the 12^th hour of estrous period, the 10^th and 10^th day of estrous cycle of the 0.3mg·kg^-1 , 0.6 mg·kg^-1and 0.9 mg·kg^-1 treatments. Peak values of 0.3 mg·kg^-1 and 0.6mg·kg^-1 groups are significantly higher than those of 0.9mg·kg^-1 and the control （P 〈 0.05 ）. Serum Follicle-Stimulating Hormone （FSH） concentrations in 0.3 mg·kg^-1 and 0.6 mg·kg^-1groups are significantly higher than those of 0.9mg·kg^-1 and the control （P 〈 0.05 ）, while the 0.9mg·kg^-1 group is in turn significantly higher than the control group （ P 〈 0.05 ）. Serum follicle-stimulating hormone peaks appear at the 8^th , 12^th and 15^th day of estrous cycle, and peak values of 0.3mg·kg^-1and 0.6 mg·kg^-1 groups significantly higher than the 0.9mg·kg^-1and control groups （P 〈 0.05 ）. Serum progesterone （Pc） concentrations of the 0.3 mg·kg^-1 and 0.6 mg·kg^-1 groups are significantly higher than those of the 0.9 mg·kg^-1 and control groups （P 〈 0.05 ）, with the 0.9 mg·kg^-1 group in turn significantly higher than the control （P 〈 0.05）. Serum progesterone peaks appear from the 8^th to the 15^th day of estrous cycle, with peak values of the 0.3 mg·kg^-1 and 0.6mg·kg^-1 groups significantly
出处
《中国生态农业学报》
CAS
CSCD
2008年第2期420-425,共6页
Chinese Journal of Eco-Agriculture
基金
国家科技成果转化项目(02EFN211401036)
奥特齐生物制品有限公司项目(04-S-640)资助
关键词
西门塔尔牛
包被硒
发情周期
生殖激素促黄体素
促卵泡素
孕酮
雌二醇
Simmental heifer, Rumen by-pass selenium, Estrous cycle, Reproductive hormone, Luteinizing-hormone, Follicle-stimulating hormone, Progesterone, Estradiol
