Urinary oestrogen excretion, oestrous behaviour and ovulation in heifers treated with prednisolone during pro-oestrus and oestrus.
The purpose of the trial was to investigate the effect of prednisolone treatment during pro-oestrus and oestrus on the ovarian function in heifers. Four heifers were treated daily with 30 mg prednisolone i.m. per 100 kg body weight from pro-oestrus until ovulation was palpated. Treatment with prednisolone did not appear to have any effect on the length of the follicular phase or on ovulation. In three of the treated heifers, the urinary excretion of oestrous behaviour was normal but in the remaining heifer the excretion of oestrogen was found to be lower and oestrous behaviour weakly expressed. The effects of corticosteroids on the follicular phase, ovulation and oestrous behaviour in different species are discussed.
D000818:Animals; D002417:Cattle / Q000502:physiology*; D004958:Estradiol / Q000652:urine*; D004970:Estrone / Q000652:urine*; D004971:Estrus / Q000187:drug effects*; D005260:Female; D010060:Ovulation / Q000187:drug effects*; D011239:Prednisolone / Q000494:pharmacology*; D011247:Pregnancy; D011359:Proestrus / Q000187:drug effects; D011374:Progesterone / Q000097:blood
D004970:Estrone; D011374:Progesterone; D004958:Estradiol; D011239:Prednisolone