Showing papers in "Animal Reproduction Science in 2008"

TL;DR: A number of changes induced during processing and storage of equine sperm also appear to induce apoptotic-like changes which may adversely affect sperm survival and function, and this review will examine current understanding of these processes on theEquine sperm function.

TL;DR: Some of the processes involved in cryopreservation, how individual sperm physiology affects the ability to survive freezing and thawing, and how cryop Reservation protocols can be customized to maximize sperm cryosurvival on an individual stallion basis are reviewed.

TL;DR: Roles of Sertoli cells in regulation of spermatogenesis are discussed and methods for estimating the number of SERToli cells, in a testis, that overcome the problems (assumptions) associated with the indented, pear-shaped of S Bertoli cell nuclei which make it difficult to estimate the volume of individual nuclei are discussed.

TL;DR: The Botu-Bov extender was more effective in preserving sperm motility and membrane integrity than was the Bioxcell extender, and the integrity of plasma membranes, acrosomal membranes and chromatin was evaluated using the acridine orange technique.

TL;DR: Effective use of hormones in uterine infection requires knowledge of both normal reproductive endocrinology and the therapeutic characteristics of available hormonal preparations, as well as the species and number of bacteria.

TL;DR: Current and past data, correlating laboratory assay data with sperm fertility are presented in an effort to determine which types of assays are important to conduct and when to conduct them.

TL;DR: The environment influences the physiology of the sow during farrowing and early lactation, and the concentration of oxytocin strongly affected the duration of farrowing.

TL;DR: The performance of frozen-thawed spermatozoa from 10 Holstein bulls in a range of in vitro diagnostic tests and the relationship with adjusted in vivo fertility data was determined.

TL;DR: Investigation of the long-term effect of a gonadotropin-releasing hormone (GnRH) vaccine, Improvac, on the levels of GnRH antibodies, testosterone, estrone sulphate (E1S) and androstenone, as well as skatole and indole in male pigs shows thatimprovac may have an extended effect compared with that currently implied by the directions for use.

TL;DR: After slow-cooling, semen-storage and shipping is best performed at 5 degrees C, maintaining semen motility, membrane integrity and DNA integrity for up to 40 h after collection, and shipping containers created from Styrofoam boxes provide maintenance of semen quality at low cost.

TL;DR: The present results suggest that kisspeptin-10 has a direct, but weak, stimulating effect on LH secretion in bovine and porcine AP cells.

TL;DR: The frequency distribution of spermatozoa within subpopulations was quite similar for the 9 bulls, either in fresh or frozen-thawed semen, and differences among bulls were mainly due to differences in the Subp.

TL;DR: It is concluded that semen variables have individual variation in llamas and are affected both by method of collection and season.

TL;DR: Duck egg yolk compared to other avian yolks in extender improves the frozen-thawed quality of buffalo bull spermatozoa.

TL;DR: The observed lower serum PON1 activity and higher MDA level in late pregnancy and early postpartum could indicate a prooxidants/antioxidants imbalance influenced by reproductive stress and metabolic adaptation in the transition period of dairy cows.

TL;DR: It is suggested that bovine embryos can be cultured either in SOFaaci medium under greater O2 tension in the presence of cumulus cells, or in SoFaacimedium under less O1 tension, without affecting embryo production or quality.

TL;DR: In six field trials, doses between 1.0 and 6.0 x 10(6) total sexed, frozen-thawed sperm were inseminated into the uterine body or bilaterally into the uterusine horns of heifers and nursing Angus cows 12 or 24h after observed estrus, with no difference in pregnancy rates.

TL;DR: This review summarizes current information regarding the nature of the multiple endocrine-paracrine-autocrine systems that may be necessary for normal testicular function in the stallion.

TL;DR: This review focuses on the sequence of ejaculation, constituents of seminal plasma and their potential use as fertility markers as well as the influence of seminal Plasma on spermatozoa during storage.

TL;DR: The present study is, as far as the authors know, the first to examine the direct actions of kisspeptin on the secretion of GH and PRL from the bovine pituitary gland.

TL;DR: Mycotoxins have direct dose-dependent effects on GC proliferation, steroidogenesis and gene expression, and these direct ovarian effects could be one mechanism whereby contaminating Fusarium mycotoxin in feedstuffs could impact reproductive performance in swine.

TL;DR: It is concluded that Botu-Crio was better than the other extenders in the ability to preserve epididymal sperm and that pre-freeze addition of Sperm Talp was also beneficial.

TL;DR: The results suggest that the increase in the expression of GHR may be a turning point for follicles to enter the ovulatory phase during final follicular development and that the insulin system may support the maturation of preovulatory follicles.

TL;DR: A detailed overview of recent insights in sperm surface remodelling pertinent to fertilization can be found in this paper, where biochemical models for membrane surface modelling and their potential involvement for remodelling the sperm surface in the above described processes are discussed.

TL;DR: Current cryopreservation procedures for stallion semen are reviewed, and then in more detail cryobiological determinants of sperm function, and mechanisms of cryoinjury and cryoprotectant action are described.

TL;DR: It is indicated that sperm functional attributes could represent important determinants of buffalo sperm quality influencing cleavage rate and in vitro fertility parameters and all the spermfunctional attributes except sperm nuclear morphology differed significantly between bulls.

TL;DR: It is concluded that 0.5-1.0 mM BHT can be beneficial for freezing Holstein bull spermatozoa in egg yolk-citrate diluent, when inseminated immediately after thawing.

TL;DR: The objective of this study was to determine the effective relationship between different motion characteristics of bull spermatozoa assessed by computer assisted semen analyzer (CASA) and in vitro fertilization percentage in zona-free hamster oocytes.

TL;DR: Results suggest that the increased ovarian activity observed in both UIP-supplemented and higher BC goats was not the result of changes in LH or GH, suggesting effects at a local level, through changes in insulin in a non-GnRH-gonadotrophin dependent manner.

TL;DR: The oestrous synchrony options available in EU countries and other countries affected by the European ban on oestrogenic compounds being used for oestrouse synchronisation are generally not as effective, efficient or cost effective as those that incorporated use of oestrogensic compounds.