Seasonal anoestrus in the ewe results from enhanced oestrogen negative feedback. Recent data have implicated the ventromedial preoptic area (vmPOA) as an important site of oestrogen action. This study addressed whether NO acts within the vmPOA to inhibit LH during seasonal anoestrus. In Experiment 1, microimplants containing Nomega-nitro-l-arginine methyl ester (l-NAME, NOS inhibitor), S-methyl...

During the breeding season, five groups of three ewes were implanted at ovariectomy with 0.36, 0.5, 1.0 and 6.0 cm oestradiol implants or implants containing no steroid. Eleven days after receiving implants, blood samples were taken every 10 min for 6 h; implants were then removed. Treatments were repeated three times during each of two consecutive breeding seasons and four times during the int...

The structural and ultrastructural modifications of the gonadotropic cells of goats were studied with an immunohistochemical method (peroxidase-antiperoxidase), in anoestrus, gestation and milk production. The cell type which predominates in anoestrus corresponds in its morphological characteristics to the classic FSH cells, and has two populations of homogeneous and electrodense secretory gran...

The clinical incidence of reproductive disorders in crossbred (local non-descript crossed with Friesian) was determined from the records maintained at the artificial insemination (A.I.) component, Livestock and Dairy Development Department, Balochistan for the period from July 1980 to June 1995. A total of 21 ,493 cases of uterine infections, reported anoestrus and obstetrical problems were rec...

Parturient goats rapidly develop exclusive nursing of their own litter that relies on olfactory recognition of the young. They also show a period of postpartum anoestrus whose duration depends on the presence of the kid. In cattle, maternal selectivity is one of the factors that delays the recovery of sexual activity. To investigate the possible influence of maternal selectivity on the duration...

In a 7-year longitudinal study 292 Bovelder beef cows in a restricted breeding system in South Africa were observed from 1 to 2 days before their first breeding season, when reproductive tract scoring (RTS, scored from 1 to 5) was performed, until weaning their 5th calves. The objective was to determine whether pre-breeding RTS in heifers is a valid tool to predict long-term reproductive perfor...

The distribution of sialic acid residues as well as other glycosidic sugars has been investigated in the horse oviductal isthmus during anoestrus, oestrus and pregnancy by means of lectin and pre-lectin methods. Ciliated cells and non-ciliated (secretory) cells exhibited different lectin binding profiles that were found to change during the investigated stages. Ciliated cells did not show any r...

The beneficial effects of nutrition on reproduction in sheep have been described, particularly on ovulation rate. However, the relationships between nutrition and reproductive seasonality are not well known. This review will deal with the effects of body fat or food intake on sexual and hypothalamic/pituitary activity in sheep, mainly focused on Mediterranean genotypes. Although only severe mal...


 There have been few studies on the use of diets and strategies to reduce length postpartum anoestrus in dairy goats, especially tropical semi-arid regions. This review discusses factors influencing return ovarian activity goats. During period, goats are puerperal their reproductive tract is being prepared for a new conception. Anoestrus necessary tissue renewal uterus (uterine involution...

The present study was undertaken to determine the predisposition of one transitional disease on other in various dairy animals Punjab. For this purpose, a total 250 respondents were randomly selected and interviewed personally from parts Punjab through structured interview schedule. Among diseases farms, anoestrus found be high (59.00%) followed by mastitis (52.00%). Dystokia highly significant...