Showing papers in "Theriogenology in 1986"

TL;DR: A procedure to obtain high and repeatable fertilization frequencies for bovine in vitro fertilization (IVF) with frozen-thawed sperm was developed and Heparin was the most important factor in increasing IVF frequencies.

TL;DR: Prostaglandin F(2)alpha and its analogues provide effective alternatives to antibiotic and antibacterial therapy for most postpartum disorders.

TL;DR: It is concluded that a certain proportion of superovulated cows and heifers develop abnormal follicular/oocyte maturation and constitute poor oocyte, and probably also embryo, donors.

TL;DR: The comparisons in this study indicate that the direct radioimmunoassay (RIA) method offered a convenient, reliable method for monitoring luteal function in the species that were evaluated.

TL;DR: Twenty-two Michigan dairy herds participating in a computerized herd-health program were studied to determine the incidence and epidemiologic characteristics of repeat-breeder syndrome.

TL;DR: Pregnancy rates at Days 2 and 14 postovulation were determined for 15 normal mares and 15 subfertile mares, and embryonic loss rates were estimated by the difference in the Day 2 and Day 14 pregnancy rates.

TL;DR: Neither serum progesterone concentrations 3 d after the LH peak nor peak serum estradiol 17beta concentrations differed among groups, but both were significantly correlated with numbers of observed CL and total ova and embryos.

TL;DR: In the P-dominated uterus, reduced physical clearance may contribute to an increased susceptibility to uterine infection.

TL;DR: Three groups of ewes were tested for pregnancy using a real-time ultrasound system rectally, beginning at Day 25 after breeding, and the results compare favorably with other methods of early pregnancy detection.

TL;DR: Prolific sheep have been found to be more sensitive to PMSG and FSH than unselected cattle as discussed by the authors, however, this may not apply to exogenous FSH.

TL;DR: To avoid such cases in international sperm exchange, methods of detecting IBR/IPV virus need to be improved and in the longer term, AI centres must be established in which all bovine stock is seronegative for IBR-IPV.

TL;DR: The differences in ovarian follicular populations between pregnant and nonpregnant heifers were attributed solely to the presence of a physiological mechanism for the selection of an ovulatory follicle in nonPregnant Heifers.

TL;DR: The results suggest that the cavity in the corpus luteum of cows does not cause infertility and should not be considered a cause of infertility.

TL;DR: Laroscopy was used to collect 1618 in vivo-matured bovine follicular oocytes and inexperienced laparoscopists encountered difficulties such as intestine perforation or failure to enter the peritoneal cavity.

TL;DR: Overall, the accuracy of the assay was 64% (116 181 ) in predicting sex, i.e., about two-thirds of the embryos were correctly sexed prior to transfer.

TL;DR: Bovine oocytes matured in vivo or in vitro were evaluated after sperm-oocyte incubation for frequency of sperm penetration, frequency of male pronuclei formation, and embryonic development.

TL;DR: FSH-P at the one dose studied was less effective than equine pituitary extract in inducing follicular activity and multiple ovulation in the mare.

TL;DR: This technique allows ewes to be used repeatedly as embryo donors and should be valuable to research workers and those involved with commercial embryo transfer in sheep.

TL;DR: It is concluded that treatment with hCG did not improve the conception rate at the first insemination, but it may be beneficial for cows that require a repeat service.

TL;DR: A total of thirty-eight water buffalo cows were treated in four experiments simultaneously either with FSH (first group) or PMSG (second group) within a 4-day period as mentioned in this paper.

TL;DR: The luteolysis resulting from the oxytocin treatment indirectly indicates that in cases of hydrometra the uterine wall is still capable of producing prostaglandins.

TL;DR: Results show that ovariectomized mares treated with altrenogest are capable of establishing pregnancy after embryo transfer and appear to be insufficient for optimal pregnancy rates after transfer in ovariECTomized recipients.

TL;DR: Progress in the development of systems for murine oocyte growth and maturation invitro is described and the presence of a high molecular weight component of serum was found to be essential during oocyte maturation in culture in order for the ova to become fertilizable.

TL;DR: It is concluded that pedometers are useful aids for estrus detection, particularly in the immediate postpartum, as well as superior to observations as a method of detection of estrus associated with the second and third post partum ovulations.