4Austin E J, Mihm M, Evans AC et al. Effects of oestradiol and progesterone on secretion of gonadotrophins and health of first wave follicles during the oestrous cycle of beef heifers. Reproduction, 2002, 124(4): 531-41.
5Wordinger RJ, Dickey JE Hill JR. Influence of a progestogen on the cytophysiologic character on the bovine adenohypophysis. Am J Vet Res, 1977, 38(4): 449-454.
6Kensinger RS, Bauman DE, Collier RJ. Season and treatment effects on serum prolactin and milk yield during induced lactation. J Dairy Sci, 1979, 62(12): 1880-8.
7Beam SW, Butler WR. Effects of energy balance on follicular development and first ovulation in postpartum dairy cows. J Reprod Fertil Suppl, 1999, 54: 411-424.
8Butler WR. Nutritional interactions with reproductive performance in dairy cattle. Anim Reprod Sci, 2000, 2, 60: 449-57.
9Battaglia DE Krasa HB, Padmanabhan Vet al. Endocrine alterations that underlie endotoxin-induced disruption of the follicular phase in ewes. Biol Reprod, 2000, 62: 45-53.
10Suzuki C, Yoshioka K, Iwamura Set al. Endotoxin induces delayed ovulation following endocrine aberration during the proestrous phase in Holstein heifers. Domestic Animal Endocrinology, 2001, 20(4): 267-278.