蛋氨酸硒对西门塔尔牛发情周期生殖激素分泌的影响

Effects of Selenium Methionine on Reproductive Hormone Level during Estrous Cycle in Simmental Heifers

选用16头18月龄、体况良好、体重（380±24）k的西门塔尔育成母牛，采用随机区组设计分为4组，以蛋氨酸硒为硒源，研究日粮添加硒（0、0．3、0．6和0．9mg／kg干物质）对其发情周期生殖激素分泌的影响。结果表明，日粮添加蛋氨酸硒显著提高了发情周期LH、FSH、R、E，水平，其中添加硒0．3mg／kg组、0．6mg／kg组显著高于0．9mg／kg组和对照组，而0．9mg／kg组显著高于对照组（P〈0．05）。结果表明，以蛋氨酸硒为硒源时，添加硒0．3～0．6mg／kg对发情周期生殖激素分泌有显著促进作用，以0．6mg／kg为佳，加上基础日粮含硒量，建议以蛋氨酸硒为硒源时日粮硒水平为0．67mg／kg干物质。

Sixteen Simmental Heifers （average BW 380 ± 24 kg, aged 1.5 years old） consuming a corn straw diet were chosen and allocated into four treatments and supplemented with different doses of selenium （0,0.3,0.6 and 0.9 mg/ kg dry matter） by feeding selenium methionine to evaluate the effects of organic selenium on reproductive hormones during the oestrous cycle.The results showed that the serum concentrations of luteinizing-hormone, follicle-stimulating hormone, progesterone and estradiol were increased significantly （P 〈 0.05） in 0.3 and 0.6 mg/kg groups compared to those in 0.9 mg/kg and control groups;and the level of reproductive hormones in 0.9 mg/kg group was significantly increased compared to that in control group （P 〈 0.05）. The results indicate that selenium methionine has a positive effect on the reproductive hormones secretion during estrus cycle. Considering the selenium content in basal diet, the optimum selenium level in the diet is 0.67 mg/kg dry matter.