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At least 667 records · Page 37Linked to original sources
PubMed1976

Dietary restrictions during adolescence and subsequent reproductive performance of turkey breeder males.

A study was conducted to investigate the effect of early dietary restriction of protein and/or energy on the subsequent reproductive ability of the tom. One hundred 8-week old Large White turkey toms (April hatch) were placed at random into four floor pens of 25 each and fed the following diets: group 1, 20.6% protein with 2,4 Mcal. M.E./kg. diet 8-12 weeks, 15.3% protein with 2.68 Mcal. 12-16 weeks, 10.4% protein with 2.85 Mcal. 16-24 weeks; group 2, 20.3% protein with 2.9 Mcal. 8-12 weeks, 14.8% protein with 2.98 Mcal. 12-16 weeks, 9.8% protein with 3.27 Mcal. 16-24 weeks; group 3, 22% protein with 2.4 Mcal. 8-12 weeks, 18.9% protein with 2.57 Mcal. 12-16 weeks, 16.3% protein with 2.81 Mcal. 16-24 weeks; group 4 (control), 22% protein with 2.91 Mcal. 8-12 weeks, 19% protein with 3.03 Mcal. 12-16 weeks, 15.9% protein with 3.17 Mcal. 16-24 weeks. Beginning with the 25th weeks all toms received a 14.3% protein diet with 2.8 Mcal. The restriction of energy significantly reduced the percentage of males producing semen, and the restriction of energy significantly reduced the percentage of males producing semen, and the restriction of energy and both protein and energy significantly depressed semen volume per male in comparison with the average produced by the control males. Other reproductive traits were not affected by early dietary controls.

Animals↗
PubMed1989

Reproductive performance in mares subjected to examination by diagnostic ultrasound.

Mares were subjected to frequent examination by diagnostic ultrasound and data were compiled with respect to reproductive efficiency. The data were collected over a 3-yr period on 1032 light horse mares. The cummulative pregnancy rate at 35 d post-ovulation was 96.8% and the pregnancy rate per cycle was 76.0% as determined by ultrasound examination. The average number of cycles per conception was 1.43, with an average of 2.29 inseminations per cycle. The incidence of early embryonic death was 7.8%. Mares were subjected to an average of 5.04 scans during the follicular phase of the cycle. The average number of ultrasound examinations per mare (including pregnancy examinations) was 9.99. Although these data were obtained from an experiment that did not use both control and treated mares, there was no indication that preovulatory oocytes or embryos were damaged by routine ultrasound examination. Comparisons with existing data from commercial facilities are difficult to make concerning any improvement in reproductive efficiency resulting from the routine use of ultrasonography, but these data do suggest relative safety in equine reproductive management when ultrasound examinations are conscientiously used.

Journal Article↗
PubMed1997

Effect of calcium soaps of fatty acids and administration of somatotropin in early lactation on productive and reproductive performance of high producing dairy cows.

This study examined the mechanisms by which calcium soaps of fatty acids and bovine somatotropin (bST) affect production and reproduction of high producing cows. Calcium soaps of fatty acids were fed at 2.2% dry matter, and 500 mg of Zn-sometribove (Monsanto Inc., St Louis, MO) were injected subcutaneously every 14 d from 10 to 150 d in milk (DIM). Production of fat-corrected milk was increased by 3.5 kg/d when calcium soaps of fatty acids were fed, by 6.1 kg/d when bST was administered, and by 7.4 kg/d when calcium soaps of fatty acids were fed and bST was administered. Body weight was similar for cows on all treatments until 85 DIM after which cows that were treated with bST had lower body weights. Body condition scores decreased more for cows treated with bST and began increasing later and more slowly. Treatment with bST resulted in more cows that experienced first ovulation after 30 DIM, and more cows on the control treatment exhibited first estrus before 35 DIM. Days open were greater when bST was administered. After the first artificial insemination, conception rates were similar for cows on the control treatment and for cows fed calcium soaps of fatty acids; conception rates after the first artificial insemination were low for all cows treated with bST. Pregnancy rates at 120 and 150 DIM were decreased by bST. Number of DIM to first ovulation, number of DIM to first estrus, and days open were negatively correlated with glucose and cholesterol concentrations in plasma. Production of fat-corrected milk was correlated with days open and with concentrations of triglycerides in plasma, nonesterified fatty acids, and cholesterol. Increased production had different effects on reproduction when induced by calcium soaps of fatty acids or bST treatment. Some of the adverse effects of bST treatments were alleviated by calcium soaps of fatty acids.

Animals↗
PubMedDate not supplied

Improving reproductive performance in overweight/obese women with effective weight management.

Obesity and overweight are common conditions in the developed countries and they carry many health consequences, including some reproductive disorders. There is a very high prevalence of obese women in the infertile population and many studies have highlighted the link between obesity and infertility. A large proportion of infertile women have polycystic ovary syndrome (PCOS) which is also linked with increased risk of obesity and other metabolic anomalies. The association between obesity and/or PCOS and hyperinsulinaemia, hyper androgenism and abnormal secretion of other hormones, such as leptin, underlies many reproductive disorders observed in this population. It has been demonstrated that weight loss can improve the fertility of obese women through the recovery of spontaneous ovulation, whereas others will have improved response to ovarian stimulation in infertility treatment. Therefore, it is proposed that following the initial assessment of infertility and body mass index or other measurement of obesity, various weight management interventions, including diet, exercise or pharmacotherapeutic approaches, should be considered for overweight and obese infertile women.

Female↗
PubMed1985

Role of decreased numbers of follicles on reproductive performance in young and aged rats.

The primary objectives of this study were to: 1) determine if removal of 1.5 ovaries from young rats would mimic reproductive characteristics that normally occur with advancing age and 2) determine if removal of 1.5 ovaries from aged rats would further advance the process of reproductive aging. Removal of 1.5 ovaries increased the number of young (P less than 0.05) and old (P less than 0.01) rats that exhibited abnormal estrous cycles. In addition, concentrations of follicle-stimulating hormone (FSH) were higher at both ages in the groups with half an ovary. The increased concentrations of FSH are consistent with a decrease in the number of growing follicles after removal of 1.5 ovaries. All groups had lower concentrations of estradiol (E2) than young controls. There was a significant increase in the number of abnormal embryos with age and removal of 1.5 ovaries when rats were mated during a 5-day estrous cycle, but there was no effect if they were mated during a 4-day estrous cycle. From the results of this study, we conclude that the reduction in ovarian tissue in young and aged rats mimicked several reproductive characteristics of advancing age. Also, an effect of aging on the hypothalamus was evident in this study.

Aging↗
PubMed2002

Effect of periparturient diseases accompanied by excessive vulval discharge and weaning to mating interval on sow reproductive performance.

OBJECTIVE: To evaluate the effect of periparturient disease accompanied by vulval discharge, and weaning-to-mating intervals, on sow fertility and litter size. DESIGN REPRODUCTIVE: data were collected and analysed from 19 Hungarian swine herds over a 4 year period. Conception rates, farrowing rates and litter sizes of sows with periparturient disease accompanied by vulval discharge were used to evaluate the relationship between duration of vulval discharge and subsequent fertility and litter size. The possibility of interactions between weaning-to-mating intervals and duration of vulval discharges was investigated to determine if there was any effect on subsequent fertility and litter size. RESULTS AND CONCLUSIONS: Both parity 1 and parity 2 to 8 sows having had periparturient disease accompanied by vulval discharge in excess of 6 days duration had significantly (P < 0.001) lower subsequent fertility (conception, farrowing and adjusted farrowing rates) compared with sows of similar parity where the duration of vulval discharge was < 4 or 4 to 6 days. There was no difference in fertility rates between sows, in both parity categories, with vulval discharge for < 4 days compared with 4 to 6 days. A duration of vulval discharge in excess of 6 days in parity 1 sows significantly reduced litter size (total born and live-born) in subsequent farrowings, but not in parity 2 to 8 sows. There was no interaction between the duration of vulval discharge and post-weaning to mating intervals. However sows with weaning to mating intervals between 7 and 10 days had smaller (P < 0.001) subsequent litter sizes compared with 3 to 6 or 11 to 14 day intervals. It was concluded that the duration of vulval discharge in excess of 6 days was an indication of a severe persistent endometritis adversely affecting fertility of sows.

Animals↗
PubMed2004

Associations of sole ulcer at claw trimming with reproductive performance, udder health, milk yield, and culling in Swedish dairy cattle.

The association between sole ulcer found at routine claw trimming 2-6 months after calving and reproductive, health and productive traits in the same lactation, was investigated in an observational study of 2368 dairy cows in 102 Swedish herds. The data were analysed by mixed multivariable linear-, logistic- and Poisson-regression modelling at the cow level, accounting for clustering within herd. Associations were found between sole ulcer and first-service conception risk in the first study year (OR 0.59), calving interval (2% longer), treatment for anoestrus (OR 1.61), and 305-day milk yield (479 kg ECM higher). No associations could be shown between sole ulcer and first-service conception risk in the second study year, the number of services per conception, clinical mastitis, high milk somatic-cell counts or culling.

Animal Husbandry↗
PubMed2003

Reproductive performance following midtrimester termination of pregnancy.

The aim of the study was to determine the impact of midtrimester abortion with extra-amniotic PGE(2) on future fertility and reproduction. Two hundred and fifteen women were enrolled. The mean induction-to-abortion interval was 21.3 h. The complication rate was 11.7%. Twenty women (9.3%) were lost to follow-up, 82 patients (38.1%) used contraception. Spontaneous pregnancy occurred in 110 out of 113 women who desired fertility (97%). Three patients were defined as infertile but conceived following treatment. The average time between the abortion and the next conception was 15.9 months (range 1-77 months). Seventy patients (63.7%) delivered at term. Premature delivery occurred in 18 patients (16.4%). Eighteen women aborted spontaneously in the first and 3 in the second trimester. One extrauterine pregnancy occurred. Second-trimester abortion with extra-amniotic PGE(2) is a safe procedure with a low rate of complication. Apparently it does not affect future fertility, but may be associated with an increased rate of premature deliveries in future gestations.

Abortion, Induced↗