Six priming doses of 40 mg progesterone at two day intervals followed by 1,000 I.U. P.M.S. were superior to two priming doses plus P.M.S. in inducing oestrus. At the first insemination after induction of oestrus, fertility was normal in animals which received two doses, but depressed in those which received six doses of progesterone. An injection of 40 mg of progesterone after the injection of ...

Prostaglandin F~(Y, (PGF2a) causes luteolysis in several species of animals including cattle and sheep. This has led to investigations with PGF2a as an agent for the control of oestrus and ovulation in domestic animals (Inskeep 1973) and to comparison of PGF2a and progestins as practical methods of synchronizing oestrus in cattle (Smith 1973). This paper reports preliminary studies of the use o...

Oestrus was induced 4-7 days after treatment with Cloprostenol (ICI 80,996) in gilts between 12 and 40 days pregnant. Fertility at this synchronized oestrus was good (85%).

The use of exogenous gonadotrophins in puberty inducement and ovulation synchronization is a technique that has a positive influence on the management of swine. The purpose of this study was to verify the effects of a second gonadotrophin treatment [equine chorionic gonadotrophin (eCG) and luteinizing hormone (LH), intramuscularly (i.m.)] upon the second oestrus synchronization and fertility in...

Thyroidal function in goats as estimated by PBI values of blood serum showed a very high activity in oestrus, followed by that in pregnancy state. There was significant increase in PBI values between oestrus and non-pregnancy groups. The lack of significance between pregnancy and non-pregnancy values has been explained. Mean PBI values in oestrus, pregnancy and non-pregnancy were respectively 5...

Oestrous intensity is positively associated with reproductive outcome in high-Abstract This study tested whether strong oestrus symptoms are linked to low lameness score, acceptable pregnancy and calving rates in heifers and first parity dairy cows with a high genetic potential for milk production. In a single Swedish nucleus herd for genetic selection and testing, oestrous intensity was determ...

No published information are available on the reproductive indices of local Abadeh does reared innorthern Fars province, southern Iran. This study was conducted to determine the duration of the breedingseason, and the length and duration of the oestrous cycle. Twenty single parity 2-year-old does from Abadeh(weighing 19–26 kg) were purchased and transferred to the School of Veterinary Medicine ...

pregnancy prevention raises much concern to many pet owners. female cats usually show undesirable behaviour during oestrus. nowadays, researchers try to explore the reliable and effective ways to prevent oestrus signs in queens. the results of their studies prove that hormone therapy is probably one of the most reliable methods for this purpose. the aim of our study was to compare the effect of...

The aim of this study was the evaluation of the relationship between values of selected biochemical blood parameters at the moment of cloprostenol (PGF2α) administration and the effectiveness of oestrus induction and fertility indices in dairy cows. Examinations were conducted on 121 cows with the corpus luteum between 45 and 120 d post calving. These animals were injected with 500 μg/cow of PG...

Bitches exhibited a characteristic arborization pattern of the fluid from the anterior vagina during pro-oestrus and oestrus. These changes were monitored together with conventional vaginal cytology and plasma oestrogen and progestagen concentrations. A classical ferning pattern, similar to that seen in bovine cervical mucus at oestrus, occurred after the peak in plasma oestrogen concentrations...