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Showing papers in "Animal Reproduction Science in 2001"


Journal ArticleDOI
TL;DR: The understanding of the role of pheromones could be of potential economic importance in addressing some of the problems associated with livestock production in the tropics and the biostimulation technique offers a potentially useful and practical way to improve reproductive efficiency in livestock species in the Tropics.

252 citations


Journal ArticleDOI
TL;DR: Armed with a battery of tests, which evaluate many different sperm attributes, researchers should be able to more accurately estimate the fertilizing potential of semen samples.

200 citations


Journal ArticleDOI
TL;DR: To evaluate retrospectively the influence of birth litter size, birth parity number, performance test parameters and age at first mating (AFM) of gilts on their reproductive performance as sows, data were collected from 11 Swedish Landrace and 8 Swedish Yorkshire nucleus herds.

177 citations


Journal ArticleDOI
Mats H.T. Troedsson1, K. Loset1, A.M. Alghamdi1, B. Dahms1, B.G. Crabo1 
TL;DR: Preliminary in vivo experiments support a suppressive role of seminal plasma in breeding-induced endometritis, and preliminary characterization of the immune-suppressive component in seminal plasma suggests it is one or more molecule(s) with a molecular weight between 50 and 100 kDa.

173 citations


Journal ArticleDOI
TL;DR: Results demonstrate that semen diluted in INRA96 extender and stored at 15 degrees C can be an alternative to semen dilution in milk-based extenders and storage at 4 degrees C for "poor cooler" stallions and can be as efficient at 15degree C as at 4degree C, for preserving sperm motility and fertility.

171 citations


Journal ArticleDOI
TL;DR: Findings presented in this review provide a general overview of growing appreciation of NO as a vital molecule controlling hypothalamic-pituitary-gonadal (HPG) axis.

149 citations


Journal ArticleDOI
TL;DR: During negative energy balance, treatment with propylene glycol, which induced small increases in plasma concentrations of insulin, prevented the short luteal phase characteristic of the first estrous cycle in control cows, consistent with the hypothesis that insulin is important for normal ovarian function.

143 citations


Journal ArticleDOI
TL;DR: Routine aspiration of small follicles (< or =4 mm) could increase the number of oocytes available for in vitro development and reduce the need for gonadotrophic therapy.

126 citations


Journal ArticleDOI
TL;DR: Intrauterine infusion of immunomodulators such as E. coli lipopolysaccharides or oyster glycogen, in healthy cows and those with endometritis, stimulates leukocytes to migrate into the uterine lumen, making the uterus more susceptible to infection.

116 citations


Journal ArticleDOI
TL;DR: A variation in the infiltration and distribution of lymphocytes, neutrophils, eosinophils, macrophages, mast cells and plasma cells in the sow endometrium during different stages of the oestrous cycle is shown.

101 citations


Journal ArticleDOI
TL;DR: While several methods have been described for detecting changes that occur during capacitation and the acrosome reaction in bovine and porcine sperm, relatively little has been documented for equine sperm.

Journal ArticleDOI
TL;DR: Heat stress appeared to induce a decrease in follicular dominance, but GnRH-induced follicular cycles resulted in development of healthy preovulatory follicles in both groups.

Journal ArticleDOI
TL;DR: HGM cows had higher milk production and reduced reproductive performance in comparison with MGM cows, and reproductive performance was not associated with milk production, feed intake or plasma concentrations of glucose, NEFA or IGF-1 between calving and first service.

Journal ArticleDOI
TL;DR: Normal appearing sperm with PD did not bind to the zona pellucida and apparently normal sperm with out proximal droplets co-existing in the semen along with sperm containing PD were also functionally deficient, resulting in reduced zonae binding and zygotes resulting from insemination with semen with a high percentage ofPD did not develop beyond cleavage.

Journal ArticleDOI
Steffen Blottner1, C Warnke, A. Tuchscherer, V Heinen1, Helmut Torner 
TL;DR: The cryopreservation of sperm during December results in survival rates similar to those measured during the breeding season, even more important for successful preservation is the selection of suitable semen donors.

Journal ArticleDOI
TL;DR: This study demonstrates that cryopreservation of epididymal canine sperm can be performed using methods similar to those established for ejaculates of the same species, and that despite some damage, spermatozoa retain their functional ability.

Journal ArticleDOI
TL;DR: It is concluded that behavioural oestrus is readily induced by 0.75mg ODB i.m./500kg BW and young DF in lactating anoestrous cows were less likely to respond to the ovulatory cue provided, and luteal development was compromised in those that did ovulate.

Journal ArticleDOI
TL;DR: Data from three commercial transported cooled semen programs support the position that comparable seasonal pregnancy rates may be obtained using frozen and liquid cooled semen in a commercial setting.

Journal ArticleDOI
TL;DR: Development of techniques for low dose insemination would allow one to increase the number of mares that could be bred, utilize stallions with poor semen quality, extend the use of frozen semen, breed mares with sexed semen and perhaps reduce the incidence of post-breeding endometritis.

Journal ArticleDOI
TL;DR: Use of modified Tyrode's medium may improve spermatozoal motility and pregnancy rates for cooled transport of semen from stallions in which all seminal plasma must be removed because of suspected toxic effects of seminal plasma on spermatozosal viability, however, Tyrodes medium may be detrimental to sperm motility when seminal plasma is present.

Journal ArticleDOI
TL;DR: Stallion and mare status are major factors in determining the success of frozen semen inseminations, and a careful selection of the stallions and mares, with proper client communication is critical.

Journal ArticleDOI
TL;DR: The results indicate that the duration of the meiotic stages differs between the species and that MAP kinase is activated before MPF and GVBD in porcine oocytes.

Journal ArticleDOI
TL;DR: There was a negative relationship between feed intake and plasma P4 concentrations in these CIDR-treated GnRH-downregulated Holstein cows, and daily excretion rate of FP4M was associated with the volume of faeces.

Journal ArticleDOI
TL;DR: The following study was undertaken to localize androgen receptors (AR) and aromatase cytochrome P450 (P450arom) in porcine ovarian tissue because ovarian androgens may act locally to modulate follicular and luteal function in various species.

Journal ArticleDOI
TL;DR: Although additional estrous detection is required compared to Ov synch, reduced cow handling and hormone usage, efficient use of expensive semen through greater conception rates in cows detected in estrus, and comparable TAI conception rates, suggests the MOV protocol may be a cost effective alternative to Ovsynch in many dairy herd reproductive management programs.

Journal ArticleDOI
TL;DR: Under the restricted feeding regime applied, high weight loss during lactation prolongs WSI in parity 1 and 2 sows, but has no influence on the ovulation rate at first oestrus after weaning, which is higher in Yorkshire than in Landrace sows.

Journal ArticleDOI
TL;DR: The uterus of domestic animals, including the horse, has a dual role in the interaction of the uterus and sperm: uterine contractions carry sperm toward the oviduct, and on the other hand the uterus eliminates excessive sperm.

Journal ArticleDOI
TL;DR: Despite the numerous benefits of having the capability to transport semen internationally, there are serious potential ramifications if that semen is contaminated with a communicable disease.

Journal ArticleDOI
TL;DR: The highest endometrial mRNA levels of ERalpha and PR were observed at oestrus and a decline was observed already at day 5, which then decreased progressively at the end of the luteal phase, while IGF-I mRNA levels were higher at day 0 and 5 than at day 12.

Journal ArticleDOI
TL;DR: It was found that, in absence of FSH, alpha-amanitin was unable to inhibit GV BD and that the success of GVBD inhibition was positively correlated to the amount of cumulus cells surrounding the oocyte.