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Showing papers in "Theriogenology in 1983"


Journal ArticleDOI
TL;DR: Results suggest that transfer of bovine embryos based on synchrony between day of recipient cycle and state of embryonic development provides higher pregnancy rates than transfers based on recipient-donor cycle synchrony.

617 citations


Journal ArticleDOI
TL;DR: Individual differences in follicular populations at the time of treatment, or in E 2 -17β levels after stimulation, could be related to differences in responses in ovulation rate.

322 citations


Journal ArticleDOI
TL;DR: In analyses of brood-farm records, ovulation occurred with equal frequency in left and right ovaries in barren and lactating mares, but with significantly greater frequency in the left ovary in maiden mares.

193 citations


Journal ArticleDOI
TL;DR: The number of ova recovered from healthy cows was affected by season, and from infertile cows by the day of the estrous cycle on which FSH was started and by the number of days since calving, while ovum number was not affected during 10 repeated superovulations, fertilization rate and embryo number decreased.

150 citations


Journal ArticleDOI
TL;DR: Super-ovulation failure and poor fertilization limited the yield of embryos obtained from donor goats and sheep less than 1 year of age and could be overcome to some extent by use of progestagen sponge rather than prostaglandin in the superovulation treatment regimen.

146 citations


Journal ArticleDOI
TL;DR: It was hypothesized that vesicle fixation (cessation of mobility) was due to increasing uterine tone with impingement of the endometrial folds upon the vesicles, andvesicle orientation was dueto greater strength of the yolk sac wall at the embryonal pole coupled with greater impingements upon theVesicle by the dorsal uterine wall than by the ventral wall.

135 citations


Journal ArticleDOI
TL;DR: No clear relationship between mounting and other activities could be established and this pattern was better defined in group A than in group B where the bull was present, although all activities were observed at some stage during the observation period.

80 citations


Journal ArticleDOI
TL;DR: Estrus by day 40 postpartum appeared to be a good indicator of the reproductive status of the dairy herd because fertility and overall reproductive performance was improved by early reestablishment of ovarian cycles and estrous expression.

75 citations


Journal ArticleDOI
TL;DR: Overall, reproductive performance varied among farm units, was lower in primiparous than in multiparous sows and was reduced during June through October, and the two-way interactions among farm unit, parity and month weaned all affected weaning-to-estrus interval.

74 citations


Journal ArticleDOI
TL;DR: The development of estrus synchronization, superovulation and estrus detection methods in water buffalo are described.

66 citations


Journal ArticleDOI
TL;DR: Mature Brangus donor cows were superovulated with follicle stim-ulating hormone administered twice daily in intramuscular injections and micromanipulated embryos were transplanted into the uterine horn of day 6.5 to 8 recipient beef females ipsilateral to the existing corpus luteum.

Journal ArticleDOI
TL;DR: Monoclonal antibodies to histocompatibility (H-Y) antigen, of IgM subclass, were used to immunologically determine the sex of mouse embryos prior to transfer to pseudopregnant recipients.

Journal ArticleDOI
TL;DR: A study was designed to establish a dose-response curve for Pergonal (Human Menopausal Gonadotrophin) and to compare its efficacy in inducing superovulation with commercial FSH-P and found that the 200% HMG dose did not increase the number of ovulations or ova recovered but did decrease the numbers of fertilized and transferable ova.


Journal ArticleDOI
TL;DR: A cryomicroscope was used to observe changes in the appearance of cattle embryos during cooling and warming in 1.4M glycerol/PBS and no change was observed in either the embryo or its surroundings except the melting of the extracellular ice.

Journal ArticleDOI
TL;DR: The results suggest that IgA and protein levels are elevated in the uterus in the presence of active infection.

Journal ArticleDOI
TL;DR: Stress acting via the adrenal gland may play a role in the aetiology of infertility in sows by altering the timing of or a suppression of the pre-oestrus LH peak.

Journal ArticleDOI
TL;DR: The fertility of frozen-thawed and fresh semen from each of three stallions was compared in an experiment with a randomized block design using 128 mares and pregnancy rates with frozen semen from two of the three stallion were 54% of the rates attained with fresh semen.

Journal ArticleDOI
TL;DR: Increasing the dose of extract from 750 to 1500 or 2250 units per day did not significantly increase the ovulatory response, and initiation of extract treatment at day 11 was as effective as initiation at day 15, with or without an injection of prostaglandin F(2alpha) on the first day of extraction treatment.

Journal ArticleDOI
TL;DR: The diameter or growth rate of the preovulatory follicle for the six days preceding ovulation and the length of the interovulatory interval for mares which did not become pregnant were not affected significantly by the presence of a stallion.


Journal ArticleDOI
Raymond D. Lambert1, C. Bernard1, R. Béland1, J.E. Rioux1, M. A. Sirard1 
TL;DR: The ovary and follicular aspiration were observed in 50 heifers by endoscopy via the right paralumbar fossa and the rate of ovum recovery was higher when a suction device was used rather than a syringe system.

Journal ArticleDOI
TL;DR: Virus isolation and histopathology on both abortuses, the stillborn calves, and three calves slaughtered at three months of age were negative for IBRV.

Journal ArticleDOI
TL;DR: It is demonstrated that PGE(2) can prolong the presence of luteal phase plasma progesterone concentrations by possibly stimulating in vivo steroidogenesis by the corpus luteum during the estrous cycle in the cow.

Journal ArticleDOI
TL;DR: The results indicated that a cow should be superovulated two or three times before being discarded as a poor embryo producer, and that some cows continued to produce embryos after 20 repeated superovulations.

Journal ArticleDOI
TL;DR: GnRH injected at insemination was effective, especially in cows at the first and third lactations, cows at 101 days postpartum or later, cows with daily milk yield of 26-30 kg, and also in cows from the area where a regional average fertility was relatively low.

Journal ArticleDOI
TL;DR: The results support the conclusion that an embryo-reduction mechanism exists in mares for the elimination of excess embryos and indicate that the mechanism loses its effectiveness when the embryos originate from asynchronous ovulations.

Journal ArticleDOI
TL;DR: Results of tests conducted under controlled conditions on a farm proved that accuracy of the technique approaches 100% for diagnosing pregnancy from day 22 of gestation through term.

Journal ArticleDOI
TL;DR: Results suggested that an endogenous secretion rhythm of FSH persisted throughout each of the physiological states of the ewes, whereas the FSH secretion decreased gradually throughout gestation and during lactation.

Journal ArticleDOI
TL;DR: Underlying seasonal reproductive mechanisms are present in cattle even though the species ovulates and breeds throughout the year, according to blood samples collected at two-week intervals.