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Showing papers in "Theriogenology in 2001"


Journal ArticleDOI
TL;DR: In conclusion, ovulation of smaller follicles produced lowered fertility possibly because development of smaller CL decreased circulating progesterone concentrations.

471 citations


Journal ArticleDOI
TL;DR: The results demonstrated that deleterious effects sperm motility after cryopreservation in EYTG can be counteracted by adding various thiols at mM concentration, and indicated in the extender that the glutathione redox-cycle was deficient.

330 citations


Journal ArticleDOI
TL;DR: In this review, the main features of folliculogenesis are summarized and compared among species, and superovulation is still an efficient technique to obtain progeny from genetically valuable females.

296 citations


Journal ArticleDOI
TL;DR: The challenge remains to modify nutritional and management strategies in high-yielding dairy cows to maintain the levels of production made possible by genetic selection and still maintain an acceptable level of fertility.

288 citations


Journal ArticleDOI
TL;DR: Experimental evidence is provided that IFN-tau regulation of STATs regulates gene expression of COX-2 in a manner that decreases secretion of PGF2alpha.

266 citations


Journal ArticleDOI
TL;DR: In field studies, the use of pregnancy specific proteins in combination with P4 measurements is useful to identify the factors influencing specifically the frequencies of early and/or late embryonic mortality.

263 citations


Journal ArticleDOI
TL;DR: Findings indicate that exposure to some in vitro environments during the first 7 days of life can profoundly influence fetal and placental development in cattle.

246 citations


Journal ArticleDOI
TL;DR: It is concluded that the lower pregnancy rate observed after long-term progestagen treatment was related to a slower follicular turnover that promoted the ovulation of persistent dominant follicles and that short-term treatment resulted in a higher pregnancy rate probably due to the Ovulation of newly recruited growing follicles.

244 citations


Journal ArticleDOI
TL;DR: For small ruminants, laparotomy or laparoscopy seems the only reliable route so far to collect oocytes from live donors, and OPU has been attempted similarly to cattle and data will be presented and reviewed.

238 citations


Journal ArticleDOI
TL;DR: This review focuses on the various aspects of these regulatory processes taking place during oocyte maturation and early development in an attempt to give an overview of the present knowledge on post-transcriptional and post- translational mechanisms taking place in the oocyte.

234 citations


Journal ArticleDOI
TL;DR: The unraveling of the mechanism for cell control of meiotic arrest opens the way to a functional and reversible culture system for immature oocytes and the remaining challenge is to discover follicular signals or factors to apply during the in vitro culture period to enhance the competence of oocytes.

Journal ArticleDOI
TL;DR: Adding the enzyme scavenger, catalase, or a variety of lipid- and water-soluble antioxidants did not significantly improve the maintenance of motility during liquid semen storage at 5 degrees C.

Journal ArticleDOI
TL;DR: There is some evidence that embryonic survival can be improved by antioxidant administration and that pharmacological treatments can be developed that reduce the degree of hyperthermia experienced by cows exposed to heat stress.

Journal ArticleDOI
TL;DR: Oocyte developmental competence as the limiting factor in applications of assisted reproductive technologies for both juvenile and aged females is examined and research aimed at identifying the specific developmental deficiencies of oocytes from juvenile donors and abnormalities of oocyte from aged females will assist in overcoming present bottlenecks that limit the efficiency of assisted reproduction technologies.

Journal ArticleDOI
TL;DR: Pregnancy rate was not affected by holding embryos after flushing for up to 3 h prior to freezing, and neither breed nor parity of recipients affected the influence of asynchrony on pregnancy rates.

Journal ArticleDOI
TL;DR: Experimental results indicate that use of hormonal and nutritional manipulations to decrease plasma concentrations of estradiol 17beta while increasing those of progesterone (P4), and inhibiting the PGF2alpha-synthesizing enzymatic machinery in the endometrium during the critical period has improved pregnancy rates following artificial insemination and embryo transfer programs.

Journal ArticleDOI
TL;DR: The results indicate that fluorometric assessment is in good agreement with other practiced procedures and can be performed with sufficient accuracy and may be a valuable complement for routinely practiced microscopic evaluation of sperm morphology of AI bull semen.

Journal ArticleDOI
TL;DR: The different modes of cell death will be explained, clarifying the confusing cell death terminology, by advocating the recommendations set forth by the Cell Death Nomenclature Committee to extend to the embryology research field.

Journal ArticleDOI
TL;DR: Use of bovine Somatotrophin (bST) in combination with the Ovsynch protocol resulted in increased pregnancy rates, indicating possible effects on oocyte and embryonic development.

Journal ArticleDOI
TL;DR: Although prepubertal gilt oocytes appeared less meiotically and developmentally competent than their adult counterparts, they can be used to produce blastocysts able to develop to term.

Journal ArticleDOI
TL;DR: A new integrated approach including computer assisted sperm analysis (CASA), viability staining and fertilization was used to study the quality of cryodiluents used in fish sperm cryopreservation as mentioned in this paper.

Journal ArticleDOI
TL;DR: It is concluded that suitability of a potential embryo transfer recipient is determined by observed estrus and a palpable corpus luteum, regardless of size or quality.

Journal ArticleDOI
TL;DR: Impaired function of cold-shocked ram spermatozoa freed from semen plasma could be prevented by addition of semen plasma proteins, resulting in higher maintained viability values, as well as the ability of Vitamin E to improve sperm survival.

Journal ArticleDOI
TL;DR: The uteri of 26 clinically healthy bitches and 42 bitches with a clinical suspicion of pyometra were examined histologically using a computerized image analysis system and it was concluded that the cystic endometrial hyperplasia-pyometra complex probably does not necessarily follow the former, but that both can arise de novo.

Journal ArticleDOI
TL;DR: The development of cell culture systems that use primordial follicles as a source of oocytes for in vitro growth and maturation will enable us to maximize the potential of high genetic merit females and to shorten generation intervals.

Journal ArticleDOI
TL;DR: Bovine blastocysts were produced using 6 commonly used in vitro culture systems and the presence of fetal calf serum in SOF not only resulted in faster development and increased blastocyst production but it also enhanced overall male survival.

Journal ArticleDOI
TL;DR: The fact that stressors can be deleterious to such an important function as reproduction, emphasizes that stress is very important and should be minimized whenever possible.

Journal ArticleDOI
TL;DR: In conclusion, a bovine in vitro culture system can affect blastocyst yield and quality and crytolerance is a useful indicator ofblastocyst quality.

Journal ArticleDOI
TL;DR: It is suggested that the addition of seminal plasma can be beneficial to sperm viability when semen is diluted to low cell numbers/dose.

Journal ArticleDOI
TL;DR: The Hamilton Thorn computer-aided semen analyzer (HTR-IVOS10 analyzer) is validated for objective assessment of canine semen and a description of fertile canine motility parameters using this analyzer is reported.