Synthesis and secretion of prostaglandin F2alpha (PGF2alpha) is elevated following parturition and exerts divergent effects on the re-establishment of fertile estrous cycles in cows. The objective of these experiments was to determine if oil seed supplements differing in fatty acid composition differentially influence serum concentrations of the specific PGF2alpha metabolite, PGFM. Safflower se...

The periparturient period is critical according to health, productivity and profitability. As this period is fundamental for the success of the lactation period, the interest in improving periparturient health by dietary supplements increased in recent years. The present study investigated the effects of feeding nicotinic acid (NA) combined with varying dietary energy densities on immunological...

Multiparous Brahman cows were assigned by order of calving and sex of calf to groups to be fed to maintain body condition score (BCS) of 6 or greater (M; n = 10) or to lose BCS (L; n = 10). Blood samples were collected weekly for progesterone analysis and at 15, 30 and 45 d after parturition at 15-min intervals for 6 h for determination of immunological (ILH) and biological (BLH) luteinizing ho...

Within location, 119 dairy cattle from two experiment station herds, which had no problems associated with parturition, were randomly either treated by insertion of two intrauterine boluses containing a total of 1000 mg neomycin sulfate 24 h postpartum or maintained as a control. Uteri and ovaries of all cows were palpated 17 to 24 days postpartum and at 14 day intervals thereafter until inovul...

Objectives were to evaluate effects of feeding a calcium salt rich in linoleic and trans-octadecenoic acids (LTFA) on synthesis of prostaglandin F(2alpha) based on its metabolite (PGFM), uterine involution and pregnancy rates in lactating dairy cows. Five hundred and eleven Holstein cows were blocked according to parity, body condition score and milk yield in the previous lactation. Primiparous...

Three levels of dietary crude protein (CP), provided by soybean meal, were fed to determine effects of protein intake on progesterone and luteinizing hormone (LH) concentrations in serum of early postpartum high-producing dairy cows. Serum LH increased between the first and second weeks of lactation in all groups. Cows fed 12.7% CP had decreased basal serum LH levels (1.1 + .04 ng/ml) as compar...

Three-hundred and thirty-five lactating dairy cows from two herds were used to compare the effects on reproductive performance of intramuscular injections of 100 micrograms gonadotropin-releasing hormone (GnRH), 250 micrograms GnRH or saline given on day 13, 14 or 15 postpartum. The incidence of ovarian cysts or uterine infections was not reduced after GnRH injection. Culling rate for infertili...

Nicotinic acid (niacin) can suppress lipolysis, but responses to dietary niacin have been inconsistent in cattle. Our aim was to determine if 24 g/d of encapsulated niacin (EN; providing 9.6g/d of bioavailable nicotinic acid) alters lipid metabolism and productivity of transition cows. Beginning 21 d before expected calving, primiparous (n = 9) and multiparous (n = 13) cows (body condition scor...

In this study, the prevalence, effectiveness of diagnosis, and treatment based on vaginal discharge score (VDS) of clinical endometritis in cattle were evaluated. To detect clinical endometritis and classify its severity, vaginoscopy was performed during 21 to 60 days postpartum in 164 Holstein cows consisting of 229 lactations. Groups were defined using the 4-point VDS scale. Study groups incl...

The study evaluated the effect of supplementation rumen protected choline (RPC) and fat (RPF) alone in combination, injection Vit-E + selenium on feed intake, blood metabolic profile postpartum fertility transition Gir cows. Forty advanced (8 months) pregnant cows were divided into five equal groups (T1 to T5, n=8) managed individually from 30 days prepartum till 60 postpartum. Cows T1 group fe...