On February 4, 14 of 28 seasonally anestrous mares were fed .044 mg per kilogram of body weight of an oral progestin, allyl trenbolone (17a-allyl-estratriene 4-9-11, 17/3-ol-3-one) for 12 days. There was no difference (P>.05) between groups for the number of mares exhibiting estrus after treatment or follicular activity during or after treatment. After March 6, 18 mares that had not yet ovulate...

To determine whether secretory patterns of melatonin change throughout the seasons in mares, blood samples were drawn byvenipuncture from nine mares at noon and midnight for five successive days at monthly intervals from August through July at the University of Missouri in Columbia, MO. In addition, during September, December, March, and June, blood samples were drawn from indwelling catheters ...

Antiserum generated in a horse against testosterone conjugated to bovine serum albumin (BSA) was administered to six lighthorse mares (androgen-immunized mares) 1 to 3 d before a prostaglandin-induced estrus and twice again at 2-d intervals. Six control mares were administered antiserum generated against BSA on the same schedule. Relative to testosterone, cross-reactivities of other steroids wi...

Clinical, virological and serological responses were evaluated in 10 pregnant mares after different challenge exposures to the asinine-94 strain of equine arteritis virus (EAV). The outcome of maternal infection on the progeny was also investigated. Mares were inoculated intranasally (n = 4), intramuscularly (n = 2), intravenously (n = 1), or contract-exposed (n = 3). All inoculated mares devel...

Follicular diameter is used as a guiding tool to predict ovulation in the mare. However, the great range in preovulatory follicular diameter makes prediction of optimal breeding time based on follicular diameter unreliable. Uterine edema pattern is also useful to determine the best time to breed, since intensity of edema tends to dissipate as ovulation approaches, however, not every mare follow...

The mare is a seasonally polyestrus breeder. In early spring, the mare enters a "transition period" between the anovulatory season and the first ovulation of the year. This period is characterized by irregular estrus cycles and high incidence of regressing dominant follicles. There is a belief that pregnancy rates resulting from the first ovulation of the season is lower than in subsequent ovul...

The aim of the present study was to investigate the differences related to age ad gender in some blood parameters of Arabian horses bred in Turkey. In this study, 12 mares, 10 stallions, 90 foals (5 to 6 months old), and 35 yearlings were used. it was indicated that total erythrocyte count (RBC) and leukocyte count (WBC) was in normal ranges for mares and stallions while RBC and WBC values were...

Persistent Mating Induced Endometritis (PMIE) is a pathological condition of mares incapable of clearing the transient physiological inflammatory reaction produced in the uterus after artificial insemination. Fifty nine (59) estrus cycles of mares presenting this condition were randomly treated with Acupuncture (n=21), Oxytocin (n=25) or Placebo (n=13). The quantity of fluid was reduced in all ...

Vitamin E, a fat-soluble vitamin, is recognized as an essential nutrient shown to affect equine immune response (Baalsrud and Øvernes, 1986). Few studies have been conducted to examine vitamin E status in the equine beyond those that established the levels in the blood (Schweigert and Gottwald, 1999). Serum vitamin E concentrations are reported to range from 1.6-7.5 μg/ml in normal horses (Butl...