Recordings of electrical activity of the oviduct and uterus were obtained during three oestrous cycles in cows fitted with an extra-cellular multi-electrode assembly. The stages of the cycle were identified by the appearance of the cervico-vaginal secretions and changes in the peripheral plasma level of progesterone were determined by radioimmunoassay. A gradual transition from local non-propag...

The aim of the present study was to determine the responses of Black Bengal Goat following synchronization with alfaprostol, superovulation with PMSG and embryo collection with surgical procedure. This research work was carried out at the Department of Surgery and Obstetrics, Bangladesh Agricultural University (BAU) during the period from January to December 2001. Three Flushing schedules have ...

Plasma concentrations of LH, progesterone and oestradiol were measured in 5 cyclic swamp buffaloes. Progesterone levels began to increase after Day 5 (Day 0 = the day of oestrus) and reached a plateau after Day 10. A rapid decrease in progesterone levels occurred during the 5 days before oestrus, followed by a sustained increase in oestradiol concentrations. Basal LH levels decreased towards th...

The serum levels of lh were measured by radioimmunoassay in androgen-sterilized and normal cyclic rats, both in the presence and absence of ovaries. The serum of persistent-oestrous rats contained significantly more lh than that of normal rats on the day of oestrus, the raised level being comparable to that found in the adult male rat. The pituitary gland of the persistent-oestrus rat resembled...

Sixty-four zebu cows, comprised mainly of Bunaji cattle aged between 3 and 7 years old, were involved in an intensive artificial insemination programme. The study was conducted during the breeding period (May-October), and cows were inseminated with freshly prepared Friesian semen when they stood to be mounted by the vasectomised bull or herdmates. Fertility was measured by serum progesterone (...

A study was conducted to investigate the possibility of measuring the electrical conductivity (EC) of cow's milk as a practical and cost-effective means of determining oestrus in cows. Prostaglandin injections were used to synchronise the oestrous cycle of 15 cows. From the onset of oestrus, milk and blood samples were collected from each cow every 2nd day over a period of 22 days. A portable, ...

In non-pregnant goats, appreciable amounts of testosterone (2.1 ng/g) and 5 alpha-dihydrotestosterone (DHT, 0.8 ng/g) were present in the corpus luteum on Day 12 of the oestrous cycle. Significant (P less than 0.01, N = 18) veno-arterial concentration differences of testosterone were found across ovaries bearing corpora lutea. No such difference in testosterone concentration occurred across ova...