Rubens Paes de Arruda

• Abstract

  Studies demonstrate that one of the major limitations to the use of equine frozen semen is observed among stallions in relation to sperm ability to survive the cryopreservation. The ubiquitin is a molecule which is involved in a route of degradation of damaged proteins or errors of synthesis. This process occurs in the passage of sperm through the epididymis, and it´s associated with infe…

  Ubiquitin role in stallions with high and low freezability and application of coenzyme Q-10 as a promoter of sperm mitochondrial function, AP.R

• Abstract

  Aiming to increase pregnancy rates improving the corpusl luteum functionality, leading to an increase in plasmatic progesterone concentration in cyclic mares and recipient mares, some groups have focused research on the use of drugs, such as anti-prostaglandins, progesterone, hCG and GnRH analogs such as buserelin. This experiment aims to evaluate the effects of hCG application in 3 diffe…

  Effects of hCG administration on different estrous cycle days on plasmatic progesterone concentration and uterine and ovarian blood flow, AP.R

• Abstract

  Nitric oxide (NO) is synthetized in vitro during L-arginine conversion to L-citruline by oxidative reactions cathalysed by the nitric oxide synthase enzyme (NOS). There are three isoforms of NOS, two are constitutive ones dependent on calcium, neuronal-NOS (nNOS) and endothelial-NOS (eNOS); and one inducible (ÍNOS) calcium independent. The localization and function of some NOS isoforms ha…

  Evaluation of nitric oxide in the capacitation of criop reserved equine sperm by flow cytometry and computerized motility analyses, AP.R

(Only some records are available in English at this moment)

• Abstract

  Equine reproduction has increasingly sought to maximize the use of semen through artificial insemination, using semen diluted fresh, cooled and frozen. However, there are still many challenges in the use of these three modalities, which include the manipulation, conservation and deposition of semen in the female's reproductive tract. Pentoxifylline has been studied as an enhancer of sperm…

  Fertilitily of frozen equine semen with addition of pentoxifylline, BP.IC

• Abstract

  This project aims to evaluate the effects of association of Cholesterol Loaded Cyclodextrins (CLC) and extenders based on Low Density Lipoproteins (LDL) purified from egg yolk, and possible interactions between these cryoprotective agents and equilibration time during the process of bovine semen cryopreservation on sperm motility, integrity, lipid peroxidation, function and lipid composit…

  Effects of extenders containing low density lipoproteins (LDL) and cholesterol, and their interactions with equilibration time, on bovine semen cryopreservation, BP.PD

• Abstract

  Aiming to increase pregnancy rates improving the corpusl luteum functionality, leading to an increase in plasmatic progesterone concentration in cyclic mares and recipient mares, some groups have focused research on the use of drugs, such as anti-prostaglandins, progesterone, hCG and GnRH analogs such as buserelin. This experiment aims to evaluate the effects of hCG application in 3 diffe…

  Effects of hCG administration on different estrous cycle days on plasmatic progesterone concentration and uterine and ovarian blood flow in mares, BP.DR

• Transvaginal ultrasonically guided follicular aspiration of oocytes in cyclic and pregnant mares treated with equine somatotropin, BE.PQ