Showing papers in "Theriogenology in 2004"

TL;DR: In conclusion, subclinical endometritis, diagnosed by EC or US, was associated with reduced relative pregnancy rate and no diagnostic criteria based on transrectal palpation of the uterus had predictive value for risk of pregnancy.

TL;DR: A low O2 concentration during in vitro culture of porcine embryos decreased the H2O2 content and, as a consequence, reduced DNA fragmentation, and, thereby, improved developmental ability.

TL;DR: There was a loss in GSH content after cryopreservation of boar semen, and addition of GSH to the freezing extender did not result in any improvement in either standard semen parameters or sperm fertilizing ability, which suggests that during the thawing process, GSH prevents damage of a sperm property that is critical in the fertilization process but that is not measured in the routine semen analysis.

TL;DR: Low-density lipoproteins preserve bull semen quality and fertilizing ability, allowing also better semen motility, after the freeze-thaw process, in conclusion.

TL;DR: The results from the present study confirm that the typical metabolic adaptations which can be found in serum of high-yielding dairy cows shortly post partum, are reflected in follicular fluid and, therefore, may affect the quality of both the oocyte and the granulosa cells.

TL;DR: The proposed simple ultrasound-based test for predicting the superstimulatory response of individual cows can be validated and can be predicted by the number of follicles > or =2mm at wave emergence.

TL;DR: Alternative cryoprotectants, having lower molecular weights and greater membrane permeability than glycerol, were evaluated to determine their effectiveness for cryopreserving stallion spermatozoa and both methyl formamide and dimethyl formamide protected stallion semen from cryodamage as effectively as Glycerol.

TL;DR: Morphology of the TVC may contribute to the greater resistance of B. indicus bulls to high ambient temperatures by conferring a better testicular blood supply and by facilitating heat transfer between the testicular artery and veins.

TL;DR: It is demonstrated that goat primordial follicles activate spontaneously in vitro, and that both FSH and EGF stimulate an increase in follicle size by promoting oocyte growth.

TL;DR: The belief that the predictive use of the results obtained in a standard boar semen quality analysis can reasonably be achieved by applying logistic correlation analyses among several function parameters of boar spermatozoa analysis and in vivo conception rates obtained after artificial insemination is supported.

TL;DR: Sperm plasma membrane integrity and function, and acrosome integrity can be considered important variables for normal sperm function and STHOST and TBG could be used for the prognosis of the potential fertility of bovine semen samples used for IVF or AI.

TL;DR: Differences in ovarian follicular dynamics, and in plasma concentrations of steroids and gonadotropins, may account for the differences in fertility between nulliparous heifers and multiparous lactating cows.

TL;DR: In conclusion, the inclusion of egg yolk significantly improved sperm motility, indicating its beneficial effects during the freezing step of cryopreservation; trehalose appeared to synergistically increase its cryoprotective effects.

TL;DR: There is a relationship between meiotic progression, cumulus expansion and mitochondrial redistribution and their oxidative activity during final pre-ovulatory maturation in pig oocytes, and it appears that increased levels of mitochondrial activities in oocytes are correlated to increased level of apoptosis in surrounding cumulus cells, in which mitochondria may play a role.

TL;DR: The interaction between follicle size and the phase of follicular wave affected the efficiency of embryo production and the yield of embryos was primarily influenced by the number of oocyte collected from medium follicles and the developmental competence of oocytes from small follicles.

TL;DR: Heifer oocyte selected by the BCB test (BCB+) are larger and more competent for IVEP than control heifer oocytes, however, fewer heifer Oocytes selected using the BCBs develop to blastocyst stage compared to cow oocytes.

TL;DR: Early-maturing bulls were more developed in the pre-pubertal period and attained puberty at earlier stages of body and testicular development than late-matured bulls.

TL;DR: Dilution of the semen samples to approximately 50 x 10(6) spermatozoa/ml and an objective lens magnification of 60x, analysing at least 100 spermatozosa, are the technical settings proposed to obtain reliable and objective sperm morphometric measurements by the HTR 12.1 Metrix in canine.

TL;DR: There were differences in the seminal plasma protein profile from bulls with low and high semenfreezability; aSFP, clusterin, proteins 3 and 11 may be used as semen freezability markers; and protein 25 was related to low semen freeZability.

TL;DR: Resulting measures from 41 of these stallions that appeared free of testicular pathology provide useful reference values for clinical evaluation, and except for EDV, the majority of the measures were higher at the cord location than at the marginal aspect of the artery.

TL;DR: EYT extender supplemented with fructose at a concentration of 70 mM was found to be the best of the tested extenders for long-term preservation of chilled canine semen.

TL;DR: Prolonged luteal phase and delayed first ovulation were two important ovarian dysfunctions that delayed postpartum resumption of cyclicity in high-producing dairy cows.

TL;DR: In conclusion, 500 IU of eCG given after 12 days of progestogen treatment had limited effects on the dynamics of ovarian follicular waves, however, eCG treatment increased serum concentrations of estradiol during the periovulatory period, particularly in anestrous ewes; this probably resulted in the synchronous estrus and ovulation in anstrous eWes.

TL;DR: It is suggested that chronic N. caninum infection prior to pregnancy appears not to affect the early fetal period, but does have a significant abortive effect after 90 days of gestation.

TL;DR: This study investigated the effect of culture media and gas atmospheres on the development of porcine nuclear transfer embryos and found parthenogenetically activated oocytes had a higher developmental rate to the blastocyst stage as compared to BECM-3 or NCSU-23.

TL;DR: The results indicate that the sperm quality of the selected boars decreased during decreasing photoperiods, in comparison with increasing photoperperiods, mainly due to impaired testicular function.

TL;DR: Single-dose GnRH treatment resulted in testosterone concentrations and semen quality consistent with immunocastration in a majority of cats treated, and Histologic evaluation of the testes revealed that in responder cats, the interstitial cells were pale and shrunken compared to the plump, polyhedral eosinophilic cells in sham-treated cats.

TL;DR: Young late lactation repeat-breeder cows benefited from progesterone supplementation, in terms of maintaining pregnancy until traditional time of pregnancy diagnosis, when the study population was stratified by parity and stage of lactation.

TL;DR: Preliminary results indicated that seminal plasma proteins have physiological functions in prolongation and stabilization of sperm viability when using sperm motility as viability index.

TL;DR: Replacing KSOM with SOF after 4 days of culture produced better quality blastocysts, and vitrification using VS3a may be used more effectively to cryopreserve in vitro produced embryos than the conventional slow freezing method.