Showing papers in "Theriogenology in 1980"

TL;DR: Ulasonic echography of the reproductive tract of the nare was performed by introducing the multicrystal probe of a real time echoscope into the rectum of mares to allow for an improved estimate of ovarian follicular population when compared to rectal palpation.

TL;DR: Short estrous cycles in beef cows were investigated in two experiments and an increased percentage of cows which had calves weaned were observed in estrus within 10 and 25 days after the date of weaning and a higher percentage had 7- to 10-day estrus cycles.

TL;DR: The rate and pattern of sperm removal seem to primarily depend on the quality of spermatozoa entering the excurrent duct, and is assumed to be associated with phagocytosis of spermutozoa mainly in the efferent ductules and proximal part of caput epididymis.

TL;DR: Generally higher amounts of IgA, IgG and IgG(T) were found in the uterine secretions of mares which had an imparied resistance to endometritis than in mares with an efficient defense mechanisms.

TL;DR: The results clearly demonstrated a profound influence of the male on estrous cycle activity during the beginning of the breeding season.

TL;DR: A higher pregnancy rate was obtained with embryos of good morphological quality than with embryos graded fair and poor, and the pregnancy rate for embryos transferred nonsurgically was lower than the pregnancy rates for embryos transfer surgically during the same time period.

TL;DR: Efficacy of PMSG vs FSH treatments did not differ in number of CL or number of ova recovered, but percentage of recovered ova that were transferable was greater, and collection of an ovum from nontreated heifers resulted in shortening.

TL;DR: A dairy herd experienced an increased incidence of retained placenta and postpartum metritis during late spring and summer of 1977 and 1978.

TL;DR: Although mean concentrations of plasma luteinizing hormone (LH) were positively correlated with days postpartum, mean concentrations did not differ and the mean maximum change and the variance of plasma LH were low on days 7, 14, 21 and 28 post partum.

TL;DR: Semen quality may be evaluated using tests for motility, concentration, and morphology of spermatozoa, and Libido may be assessed during semen collection procedures or from observations of the owner.

TL;DR: Injection of Indomethacin near the time of transfer, synchronization between donor and recipient onset of estrus and embryo age did not affect pregnancy rates.

TL;DR: Serum levels of progesterone and estradiol-17beta were above normal bovine levels following the P and EB treatments, respectively, and the mean UT ovum transport rates were 0.42, 0.21 and 0.23 cm/hour in the P, EB and C treatment groups, respectively.

TL;DR: The widespread distribution of frozen semen, an ideal system for preserving viral infectivity, indicates this product could serve as an important vehicle for transmission of viruses to unin infected herds or areas.

TL;DR: Progesterone concentrations were determined by radioimmunoassay in the plasma of heifers of German Brown Swiss, Holstein-Friesian and White Fulani cattle during two consecutive estrous cycles in the dry and wet seasons in a tropical climate to suggest a possible tendency for the former to be more susceptible to infertility arising from high progesterone levels 1 and 2 days preceding estrus and insemination.

TL;DR: LH is suppressed during early lactation, gradually increases during late lactation (day 21) and then reaches peak concentrations after weaning near the onset of estrus, and progesterone rises transiently at weaning and then increases after estrus and ovulation.

TL;DR: The sexing of morula stage embryos is not to be recommended because it is technically more complicated and much less successful than sexing later staged embryos and not every metaphase spread would be suitable for sexing.

TL;DR: Estrous response and pregnancy rate of lactating beef cows treated with SMB were increased by 48 hr calves removal, compared to no calf removal or 24 hr calf removal, when calf removal time began with removal of the SMB implant.

TL;DR: The results reported here indicate that the criteria used for classification of the morphological appearance of the 7 day old bovine blastocyst reflected the degree of cellular organization and the number of cells.

TL;DR: Analysis of the data showed that rams of the larger maturing breeds had larger SC measurements and that there was a significant correlation between SC and BW in all breeds.

TL;DR: It is concluded that different recommendations for appointment artificial insemination (AI) may be indicated depending on the number of prostaglandin injections which are used in a prostag landin synchronization program prior to Insemination.

TL;DR: The fertility of the animals artificially inseminated at the cloprostenol-induced estrus was similar to that of insemination at the naturally occurring estrus in Trial I and Trial II and the first service pregnancy rates of the Animals bred at a predetermined time were similar to those bred at the CLP- induced estrus.

TL;DR: To understand the mechanisms for introducing urine or vaginal secretions into the vomeronasal organ, 16 mm cinematography and a freeze frame/slow motion technique are used to analyze the mouth and tongue movements of Brahman bulls while they examined the vulvas of restrained, estrogen-primed cows.

TL;DR: Sixteen heifers were superovulated using 5 000 i.u. PMSG on days 9 to 11 of the oestrous cycle (day 1 of the experiment) followed by two injections of 500 mug Estrumate 48 and 54 hours later, which resulted in a shorter heat period and a higher mean number of ovulations.

TL;DR: It was concluded that the use of 8 mg injections of PGF2alpha 11 days apart had no detrimental effects on fertility of goats.

TL;DR: The sex of 149 blastocysts was determined after colcemid treatment, hypotonic shock, fixation and Giemsa staining, and the main difficulty in sexing was the absence of metaphase or the presence of incomplete metaphases on the preparations.

TL;DR: Ewes marked between one and five days after treatment and having a decrease in plasma progesterone were considered to have responded to the treatment, and differences due to dose were significant with the two higher doses being more effective.

TL;DR: In this paper, the importance of gestation losses after a single cervical transfer of 128, 10 to 12-day-old bovine embryos was determined after combining several techniques, including progesterone assay at days 21, 28 and 35, heat detection twice daily, rectal palpation at day 60 or planned slaughter.

TL;DR: Two experiments were conducted to determine whether treatments with gonadotropin releasing hormone (GnRH) during the early postpartum period in suckled cows would induce ovulation and initiate regular estrous cycles.

TL;DR: Plasma progesterone levels in heparinized blood collected from four nulliparous Holstein cows on day 3 (early luteal), day 10 or 11 (mid-luteal) and day 18 or 19 of the estrous cycle were found to decline over time when blood was incubated at ambient temperature.