Plasma vasopressin concentrations vary throughout the rat oestrus cycle. In order to determine the relationship of these fluctuations to fluid retention, studies were carried out in cycling female albino rats. The animals were housed in individual metabolism cages under 12 hourlight/12 hour dark regimen, with free access to food and water. Urine samples to determine volume, osmolality and eiecr...

This article reviews current knowledge concerning the occurrence of vulval discharges in sows. Both the role of the vaginal flora and the management practices on the herd are emphasised. It appeared that the vaginal flora changes with the reproductive stage of the sow, and that many of the bacteria of the vaginal flora are similar to those frequently reported in clinical cases of the vulval dis...

no report has been published on the economical losses associated with errors in oestrus detection in cows under iranian intensive dairy management. the following study was carried out to determine the accuracy of oestrus detection by farmers using artificial insemination in shiraz dairy farms. milk samples were collected from 179 holstein milking cows at the time of artificial insemination. mil...

The urinary bladder undergoes plastic changes during physiological alterations such as pregnancy. This study has shown that bladders from pregnant rats weighed three times more than bladders from virgin rats. Each milligram of detrusor muscle from pregnant rats contracted more strongly to nerve stimulation (150% greater) and agonists (50% greater or more) compared to detrusor from virgin rats a...

INTRODUCTION As a consequence of poor productivity caused by a long anoestrous period, considerable research effort has been given to oestrus induction in dogs to enhance the productivity of young dogs and to preserve breeds. MATERIALS AND METHODS Oestrus was induced in 30 anoestrous bitches more than three months after the last oestrus. Bitches orally received fermented rice punch with or wi...

Measurements every day or every other day showed that testosterone levels ranging from 15 to 70 pg/ml were higher at oestrus in 4 of the 6 mares studied. In these 4 mares, another testosterone peak occurred 11--13 days before the next oestrus either before (3 mares) or after the fall in progesterone levels.

1. Masoodi M, Hosseini K. The respiratory and allergic manifestations of human myiasis caused by larvae of the sheep bot fl y (Oestrus ovis): a report of 33 pharyngeal cases from southern Iran. Ann Trop Med Parasitol. 2003;97:75–81. 2. Fathy FM, El-Barghathi A, El-Ahwal A, El-Bagar S. Study on human ophthalmomyiasis externa caused by Oestrus ovis larva, in Sirte-Libya: parasite features, clinic...

BACKGROUND Declining fertility is a major concern for dairy farmers today. One explanation is shorter and weaker expression of oestrus in dairy cows making it difficult to determine optimal time for artificial insemination (AI). Chemical communication is of interest in the search for tools to detect oestrus or to synchronise or enhance oestrous periods. Pheromones, used in chemical communicatio...

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...

This study predicts the magnitude and between herd variation in changes of methane emissions and production efficiency associated with interventions to improve reproductive efficiency in dairy cows. Data for 10,000 herds of 200 cows were simulated. Probability of conception was predicted daily from the start of the study (parturition) for each cow up to day 300 of lactation. Four scenarios of d...