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...

In modern high-yielding dairy herds fertility is of major economic importance. In order to gain maximum profit, calving intervals should not exceed 365 days. The achievement of a 365-day calving interval requires an early resumption of ovarian activity, an excellent oestrus detection, and a high first-service conception rate. Especially the inability to detect oestrus and to mate the cows by 60...

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...

Disease and stress can disrupt the circadian rhythm of activity in animals. Sensor technologies automatically detect variations daily activity, but it remains difficult to exactly when disruption starts. Here we report a mathematical Fourier-Based Approximation with Thresholding (FBAT) method designed changes cows whatever cause change (typically disease, stress, oestrus). We used data from an ...

This study was carried out to determine the effect of repeated injections cloprostenol sodium during early luteal phase on luteolytic capacity and hormonal changes Large white x Pietrain in Otukpo. A total ten (n = 10) oestrus sows were randomly divided into two groups. experiment a control. Group I 5) no synchronizing agent administered II received 6 doses 500 µg at days 5, 6, 7, 8, 9 10 oestr...

Since structural luteolysis involves deterioration of tissue, the gene expression of matrix-metalloproteinase-1 (MMP-1) and the respective tissue inhibitor of this metalloprotease (TIMP-1) were measured at various times on the day of pro-oestrus and in animals in which the preovulatory prolactin surge was blocked for the duration of 3 cycles by bromocriptine. An additional group of prolactin-bl...

Changes in the genital mucus around the oestrus are used by different diagnostic methods to determine optimal fertilisation time. In the current study, the authors evaluated the different arborisation patterns found in vestibular mucus, and also established its relationship with vestibular resistance changes during oestrus. Thirty multiparous sows were checked by transrectal ultrasonography to ...