1000 resultados para Equino - Reprodução animal


Relevância:

90.00% 90.00%

Publicador:

Resumo:

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Relevância:

90.00% 90.00%

Publicador:

Resumo:

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Relevância:

90.00% 90.00%

Publicador:

Resumo:

Pós-graduação em Medicina Veterinária - FMVZ

Relevância:

90.00% 90.00%

Publicador:

Resumo:

Pós-graduação em Medicina Veterinária - FMVZ

Relevância:

90.00% 90.00%

Publicador:

Resumo:

Pós-graduação em Medicina Veterinária - FMVZ

Relevância:

90.00% 90.00%

Publicador:

Resumo:

Pós-graduação em Medicina Veterinária - FMVZ

Relevância:

90.00% 90.00%

Publicador:

Resumo:

O presente trabalho envolveu três experimentos: Influência da imunização passiva contra estradiol (E2) e a aspiração do maior folículo (F1) no momento do desvio folicular esperado, sobre a ocorrência do desvio folicular observado. Também foi objetivo verificar o efeito desses tratamentos sobre o perfil de hormônio folículo estimulante (FSH), hormônio luteinizante (LH) e inibina total circulante. Para tanto, os animais foram imunizados com dose única de soro anti-E2 (G anti-E2) ou o F1 foi aspirado no momento do desvio esperado (GAF1). O plasma sangüíneo foi obtido no período pré e póstratamento. O intervalo entre o dia da aplicação do soro (desvio esperado) e o dia da detecção do desvio foi em média o mesmo para o G anti-E2 e controle. No GAF1, a eliminação do maior folículo provocou atraso no momento da detecção do desvio folicular entre o segundo (F2) e o terceiro (F3) maior folículo, comparado ao controle. Em ambos os tratamentos o perfil de FSH, LH e inibina total foi similar ao controle. O experimento 2 tratou de um projeto piloto visando dominar a técnica de colheita de fluido dos grandes folículos ovarianos por meio de punção com agulha fina e o efeito desse procedimento sobre o folículo e às concentrações hormonais. Foram utilizados dois grupos de animais, G1 o folículo foi mantido intacto (controle) e G2 foi utilizada uma punção folicular quando o maior folículo atingiu diâmetro ~35 mm. Ultrasonografia ovariana foi realizada desde o ínicio da detecção de um folículo ~25mm, seguindo até a detecção da ovulação. O terceiro experimento objetivou verificar a influência de gonadotrofina coriônica humana (hCG) em folículos de 30 ou 35mm sobre as concentrações de hormônios esteróides e fatores intrafoliculares. A colheita do fluido folicular foi realizada imediatamente antes e 30 horas após a aplicação... (Resumo completo, clicar acesso eletrônico abaixo)

Relevância:

90.00% 90.00%

Publicador:

Resumo:

The recombinant bovine somatotropin (rbST) at first, had its widespread use in dairy cows in order to increase milk production. Currently, it has been studied frequently and use their influence both in bovine milk, such as cutting. Its production has been an evolution to the science, using bacteria to produce recombinant DNA. Most authors that have studied and obtained positive results, such as increasing the number of ovarian follicles larger than five millimeters, among others. Its action takes place directly on the ovary, follicles, corpus luteum, the granulosa cells, oviduct, myometrium, endometrium and placenta, where they were found receptors, or indirectly through the release of insuline like growth factor-1 (IGF-1). Therefore, the objective of this work is to explain the importance of bST in bovine as well as the usefulness of this, its mechanism of action and the benefits it can bring when combined with other biotechnology, such as superovulation, embryo transfer, synchronization of estrus, and others

Relevância:

90.00% 90.00%

Publicador:

Resumo:

The acceptance of biotechnology for the most equine breeders association had a significant effect in the horse industry, gaining popularity around the world, because the increasing on the genetic gain, allowing the use of sub fertile mares and stallions with high genetics value on reproduction. The embryos in vitro production of human and cattle has been used with success, however in vitro embryo production is not efficient in the horse, as oocyte transfer (OT) and intracytoplasmatic sperm injection (ICSI). The oocyte transfer has been used especially in subfertile old mares presenting reproductive pathologies as: endometrite, cervical and uterine adhesions, blocked oviduct, perineal laceration and ovulation failures. During oocyte recovery process, the oocytes must be collected from immature follicles that need be matured in vitro or in vivo matured oocytes from pre-ovulatory follicles through the transvaginal aspiration guided by ultrasound. The recovered oocyte is transferred to a previously inseminated recipient mare, through the flank laparotomy. The intracytoplasmatic sperm injection (ICSI) is a procedure of in vitro fertilization that needs only one sperm that is aspirated and injected inside the oocyte. The oocytes used, can be from mature and immature follicles. Fresh, cooled and frozen semen can be used, because the procedure not requires a functional sperm. The use of Piezo drill resulted in a breakthrough the pellucid zone, allowing the vibration per minute provided in the sperm injection pipette, a major result of cleaved oocytes, due to a better sperm injection in the oocyte. The embryo transfer can be straight inside the oviduct, as also transcervical transferred after embryo culture produced in vitro. In conclusion both procedures (OT and ICSI) are effective to be used on equine assisted reproduction, getting results even lower than expected, but satisfactory from animal genetically superior

Relevância:

90.00% 90.00%

Publicador:

Resumo:

With the increasing development of the brazilian sheep production, the producer was forced to achieve higher production rates. The use of artificial insemination has been shown as an important biotechnological tool in animal breeding. Among the various existing techniques, the superficial cervical insemination with fresh semen is demonstrating fertility rates between 70 and 80% (AISEN, 2008), in addition to its applicability, it does not require sophisticated equipment or manpower to highly specialized implementing these plans greater possibility in your job to maximize reproduction and greater dissemination of superior genetic material on the property. This study aims to address aspects of artificial insemination with fresh semen in sheep and its applicability in commercial herds biotechnology as a tool in assisted reproduction

Relevância:

90.00% 90.00%

Publicador:

Resumo:

The Doppler ultrasound allows the assessment of blood flow and the differentiate vessels according to each spectral pattern, location and organ that irrigate, helping the examinations and disease diagnosis. The main methods used are Pulsed Doppler, Color Doppler and Power Doppler. In Brazil veterinary medicine, it shows progress since 1990, but its use is limited by the equipment high cost, the need for operator experience and patient cooperation. There are studies in obstetrics and reproduction of dogs and cats, such as evaluation of the testicular vasculature, including the use of contrast material, and attempts to evaluate prostate in healthy dogs or pathological conditions (cancer and testicular torsion , orchitis and benign prostatic hyperplasia; estrous cycle monitoring, evaluation of irrigation in follicles and corpus luteum, uterus and breasts (mammary tumors) in bitches; monitoring pregnancy from the assessment of maternal, fetal and placental hemodynamics, both in dogs as in cats, and aspirations for early detection of pregnancy in dogs. However, new studies are still required, given the lack of these species, especially cats