To be ultimately successful, techniques used to control the oestrous cycle of the cow will have to embody methods which allow the time of insemination to be arranged without reference to behavioural oestrus. This is particularly important in the case ofbeefsuckler cows as it is difficult to detect heat in these animals probably owing to the suckling stimulus. This means that treatments used to ...

Glycerylphosphorylcholine (GPO) diesterase activity and protein concentration in the rinsings of the rat uterus were greater during pro-oestrus and oestrus than at metoestrus or dioestrus. Oestradiol-3, 17~ significantly stimulated the secretion of this enzyme in ovariectomized rats and maximum levels of activity were observed 24-36 hr after a single injection of the oestrogen. The protein cont...

The aim of this study was to characterise the follicular dynamics in first two oestrous cycles peripubertal Malabari goats. Transrectal ultrasonography carried out on alternate days after observed oestrus. Follicular studies revealed presence five wave with predominant three and four patterns. interwave interval for ovulatory longer than preceding waves cycles. diameter largest follicles 1 larg...

Longitudinal ultrasound, behaviour and endocrine evaluations were conducted, over 14 to 18 months, in two young female Indian rhinoceroses (Rhinoceros unicornis) to characterize the oestrous cycle. Both females showed the same pattern of follicular development producing a large follicle (10-12 cm diameter) on one of the ovaries that persisted for 8.5 +/- 4.68 days before spontaneously ovulating...

Prairie voles (Microtus ochrogaster) typically stop breeding during winter. Male prairie voles respond to winter day lengths with gonadal regression, whereas female voles are relatively unresponsive to photoperiod. Unlike commonly studied laboratory rodents, female prairie voles do not exhibit spontaneous oestrous cycles. Instead, females are induced into oestrus by chemosensory cues from consp...