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Showing papers in "Theriogenology in 1975"


Journal ArticleDOI
TL;DR: Results show that estrous synchronization and conception can be obtained by PGF2α injections started 5 to 20 days after EB treatment, and this response was in the group given 10 mg of EB daily on Days 11 through 14 in which 5 of 6 gilts had maintained CL.

40 citations


Journal ArticleDOI
TL;DR: Fertility and semen quality tend to decline with age of the bull, and more emphasis should be placed on pedigree selection of bulls for reproductive fitness initially, where the information is available, and in performance testing the bull at puberty (testis and semen evaluation) before putting it into service.

39 citations


Journal ArticleDOI
TL;DR: A summary of a total of 1127 breeding soundness examinations conducted on 1005 bulls utilizing the method of examination and criteria for classifying bulls of the Society for Theriogenology is being reported.

33 citations


Journal ArticleDOI
TL;DR: Parturition was induced in 61 young cows and heifers of the German Black Pied breed by injection of 20 mg dexamethasone (Dex) on Days 266 to 291 (mean Days 274) and the number of stillbirths, dystocias and perinatal losses observed were low and equally distributed between groups.

24 citations


Journal ArticleDOI
TL;DR: Parturitions were induced in 66 dairy cows and heifers of the German Black Pied breed, 11 to 13 days before term, using either a highly potent corticosteroid (flumethasone): 2 × 5 mg, or prostaglandin F 2α (20 mg i.v.) and initiating treatments either in the morning (A.M.) or late afternoon (P.M).

24 citations


Journal ArticleDOI
TL;DR: The prostaglandin F analogue was without side-effects, and hence should be of value in manipulating the estrous cycle of the mare.

21 citations


Journal ArticleDOI
J.E. Nellor1, R.W. Daniels1, J.A. Hoefer1, D.E. Wildt1, W.R. Dukelow1 
TL;DR: Pregnancy was prolonged as long as 23 days in gilts receiving daily oral 6-methyl-17 acetoxy-progesterone (MAP) at a level of 0.27–0.41 mg/kg body weight and did not interfere with normal parturition and live litter size if treatment was terminated at the calculated term date which corresponded with the day of milk let-down.

19 citations


Journal ArticleDOI
TL;DR: It is confirmed that anaplamosis is a cause of abortion in pregnant cows and developed anaplasma CF antibody following inoculation.

18 citations


Journal ArticleDOI
TL;DR: Plasma progesterone measured by radioimmunoassay in two cows treated with A-PGF decreased before calving indicating regression of the corpus luteum, the most noticable side effect was the high number of placenta retention observed in each lot.

16 citations


Journal ArticleDOI
TL;DR: Contrary to the drug effect in one tom, castration did not result in the loss of social status, while his sexual interest and behavior was entirely diminished, which prevented gestation in 15 heat episodes.

16 citations


Journal ArticleDOI
TL;DR: It is indicated that the oestrous cycle of this elephant has a duration of approximately 16 days and a regular occurrence of Keratinisation at approximately 15-day intervals.

Journal ArticleDOI
TL;DR: Examination of the literature in the light of the premise that the answer to the question of the role of seminal plasma constituents will require an overall view of each species' reproductive physiology as it relates to such events and processes as gamete production, copulation, gamete transport and the environment within the female tract is examined.

Journal ArticleDOI
TL;DR: An attempt was made to produce twin pregnancies by adding one ovum to the uterus of 17 cows presumed pregnant from insemination 5 to 10 days earlier, with 2 of 8 recipients having a naturally-occurring estrus.



Journal ArticleDOI
TL;DR: Follicle maturation leading to ovulation, accompanied by estrus, was observed, and fertility at mating either by natural service or artificial insemination was satisfactory, and a dose of 1.0mg was generally effective for luteolysis, but pregnancy rates were lower than after 2.0 mg.

Journal ArticleDOI
TL;DR: The hydrogen ion concentration of the fluids of the uterine lumen was determined in six mature cows at 2 day intervals throughout the normal oestrous cycle to identify the lowest values prior to ovulation and a second low mean value occurred about 10 days following ovulation.

Journal ArticleDOI
TL;DR: The authors conclude that with the dose used the three prostaglandins studied do not have greatly different effects on uterine contractility in estrous ewes.


Journal ArticleDOI
TL;DR: It is concluded that further investigation is justified regarding the value of progestin-impregnated sponges as a practical means of estrus synchronization in cattle.


Journal ArticleDOI
TL;DR: GnRH generally stimulated follicular growth in calves, but in most instances did not result in ovulation, however, GnRH did induce ovulation in all PMS primed calves and lambs.

Journal ArticleDOI
TL;DR: The concentrations of plasma estrogens, progesterone, and corticosteroids and of urinary pregnanediol, pregnanetriol, ketogenic steroids, and cortisol were determined as indicators of ovarian and adrenal function throughout a normal sow's estrous cycle to suggest an interrelationship between adrenalfunction and ovarian estrogen production.

Journal ArticleDOI
TL;DR: The tentative conclusion is that mestranol dose not interfere with fertilization or early embryonic development but rather with implantation, resulting in resorption of degenerating embryos.




Journal ArticleDOI
TL;DR: It was concluded that ergoty grains should not be fed to breeding or pregnant ewes during gestation and that supplementation with a ration that contained 0.1, 0.5 or 0.7% ergot decreased the percent ewers lambing by approximately 20% but had no effect on the number of lambs born per ewe lambing.

Journal ArticleDOI
TL;DR: Ewe lambs from five breeds were early-weaned from ewes kept on fenced sagebrush-grass range and fed in dry lot or supplemented on pasture or dry fall range at different rates during the prebreeding and 50-day breeding periods.

Journal ArticleDOI
TL;DR: The uterus was flushed with a transvaginal technique 5 to 6 days after isemination in 6 naturally ovulated and 6 superovulated cows and the recovery rate was 43% of the number of corpora Jtea (20/46).