4[3]ENGHSH J, POWLTON A L, ARENDT I,et al.Acomparision of the efficency of melatonin treatmems in ad-vancing oestrus in ewes[J].Endocrinology, 1986, (77): 321-327.
5[4]NOWAK R, RODWAY R G.Effect of intravaginal implants of Melatonin on the onset of ovarian activity in adult and prepubertal ewes[J].J Repord Fert, 1985,(74):287-293.
6[5]KENNAWAY D J, GILMORE T A, SEAMARK R F.Effect of Melatonin feeding on serum prolactin and gonad-otropin in levels and the onset of seasonal estrous cyclicity in sheep[J].Endocrinology, 1992,(110):1 766-1 772.
7[6]MENAKER M, ZIMMERMAN N.Role of the pineal in circandian system of birds[J].Am Zool, 1976,(16):45-55.
8[7]SIMPSON M, FOLLETT B K.Pineal and hypothalamicpacemakers: their role in regulating circadian rhythmicity in Japanese quail[J].J Comp Pysiol, 1981,(144):381-389.
9[8]OHTA M, KADOTA C, KONISHI H.A rol of melatonin in the initial stage of photoperiodism in the Japanese qu-eal[J].Biology of Reproduction, 1989, (40): 935-941.
10[14]Ebels, Balemans MGM.Physiological aspects of pineal functions in Mammals.Physiological Reviews, 1986,66,581-605.
