Effects of Copper lysine on Serum Reproductive Hormone Level during Estrous Cycle in Simmental Heifers

Abstract

Abstract: 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). This 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。

CLC Number:

S816.7

Wang Cong, Huang Yingxiang, Yue Wenbin, Liu Qiang, Meng Jie. Effects of Copper lysine on Serum Reproductive Hormone Level during Estrous Cycle in Simmental Heifers[J]. Chinese Agricultural Science Bulletin, 2006, 22(10): 7-7.

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