235 resultados para Gato - Reprodução
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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
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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
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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
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Haddadus binotatus é uma espécie endêmica de Mata Atlântica e ocorre desde o sul de Pernambuco até o Rio Grande do Sul. Apesar da sua ampla distribuição pouco se conhece da história natural dessa espécie. Haddadus binotatus apresenta desenvolvimento direto e ovos são depositados sob a serapilheira ou sob troncos caídos. Há dimorfismo sexual, sendo as fêmeas maiores do que os machos. O objetivo desse estudo é conhecer os padrões reprodutivos de populações de H. binotatus no continente e em ilhas do litoral do estado de São Paulo. Os objetivos específicos são: 1) avaliar as diferenças morfológicas entre populações de H. binotatus entre ilhas e entre ilhas-continente, 2) avaliar se há dimorfismo sexual em cada população, e 3) comparar os padrões reprodutivos entre populações insulares e continentais. Neste estudo, foram utilizados exemplares de H. binotatus, depositados na coleção de Anfíbios (CFBH), do departamento de Zoologia, Instituto de Biociências, UNESP, Campus de Rio Claro. Os exemplares são provenientes de uma localidade no continente (São Sebastião) e três ilhas (Couves, Queimada Grande e Ilhabela). Os exemplares provenientes das ilhas, com exceção daqueles da Ilha das Couves, foram maiores do que os da Juréia. Houve dimorfismo sexual em todas as populações, sendo as fêmeas maiores. As populações insulares apresentam número de ovócitos menor do que a população do continente (Juréia). O número de ovócitos semelhante aos da população da Juréia foi registrado para uma população em Minas Gerais, reforçando o padrão de que populações insulares têm desovas menores. No entanto, não houve diferença no tamanho dos ovos. As diferenças encontradas para as populações insulares podem ser resultado de recursos mais limitados como espaço e alimento, pelo tamanho das presas e/ou ausência de predadores. Este estudo preliminar representa... (Resumo completo, clicar acesso eletrônico abaixo)
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The dairy sector has undergone considerable economic losses due to low fertility rates due to adverse effects of heat stress on reproduction of cows. Genetic selection for increased production, coupled with the expanding dairy to tropical areas of the planet, and global warming has further aggravated the problem of heat stress. The effects of heat stress are multifactorial and act directly or indirectly at various levels of reproductive tissues, resulting in low fertility of cows, which in practice, results in reduced reproductive efficiency in the property, reducing the producers’ profit. Some strategies related to breeding biotechnology such as fixed-time artificial insemination, embryo transfer and use of BST, can minimize these effects and improve the reproductive efficiency of the herd
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Climate change in tropical countries, like Brazil, causes major problems in dairy production due to an increase of heat stress effects. In recent years, milk production in Brazil increased 36.07%. The Southeast region remains a leader in production with herds of high producing Holstein cattle (mostly), which is more susceptible to heat stress. Thermal stress decreases fertility in direct and indirect ways. Conception rates are reduced of 40-60% during cooler months of the year and 10-20% in the warmer months. Negative effects of heat stress involve changes in reproductive hormones, follicular development, oocytes, and embryos, and decreased dry matter intake. Several studies discuss change in reproductive hormones, such as reduction in plasma concentration of GnRH, LH, and oestradiol, which lead to decreased detection of estrus and ovulation. Various methods are being studied to bypass these negative effects and increase the fertility of dairy cows under heat stress. Cooling systems are the most advantageous and can be associated with technologies such as ET and TAI
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In the last years Brazil has achieved a leading position in worldwide cattle breeding. This country is consolidating the practice of an intensive and technical level cattle breeding, due to greater emphasis on reproductive efficiency and genetic improvement. The attention given to reproductive efficiency became to enhance the genetic improvement process, by exploiting the full reproductive potential of the animals. The biotechniques applied to reproduction arised to expand the reproductive potential for greater economic return. Are the most important reproductive biotechniques the FTAI and in vivo and in vitro embryo production for embryo transfer. Different hormonal treatments are consolidating to interfere with normal physiology in order to achieve the desired goals. The FTAI works to increase the reproductive rates of cattle through pre-booked artificial insemination in all the females in reproduction, without the need for estrous detection. The in vivo and in vitro embryo production aims to distribute the genetics of males and females genetically improved by transferring their embryos to genetically inferior females. Superovulation treatments designed to prevent the mechanism of dominance, which results in many follicles ovulating simultaneously for in vivo embryo production. To the in vitro embryo production, the technique of ovarian puncture guided by transvaginal ultrasound allows to aspirate a number of quality oocytes. The application of biotech is based on knowledge of the female and ovarian reproductive physiology and knowledge of their acting in different breeds and environments.
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Experimental models are necessary to elucidate pathophysiological mechanisms not yet understood in humans. To evaluate the repercussions of the diabetes, considering two methodologies, on the pregnancy of Wistar rats and on the development of their offspring. In the 1st induction, female offspring were distributed into two experimental groups: Group streptozotocin (STZ, n=67): received the β-cytotoxic agent (100mg STZ/kg body weight - sc) on the 1st day of the life; and Non-diabetic Group (ND, n=14): received the vehicle in a similar time period. In the adult life, the animals were mated. After a positive diagnosis of pregnancy (0), female rats from group STZ presenting with lower glycemia than 120 mg/dL received more 20 mg STZ/kg (ip) at day 7 of pregnancy (2nd induction). The female rats with glycemia higher than 120mg/dL were discarded because they reproduced results already found in the literature. In the mornings of days 0, 7, 14 and 21 of the pregnancy glycemia was determined. At day 21 of pregnancy (at term), the female rats were anesthetized and killed for maternal reproductive performance and fetal development analysis. The data were analyzed using Student-Newman-Keuls, Chi-square and Zero-inflated Poisson (ZIP) Tests (p<0.05). STZ rats presented with increased rates of pre (STZ=22.0%; ND=5.1%) and post-implantation losses (STZ=26.1%; ND=5.7%), reduced rates of fetuses with appropriate weight for gestational age (STZ=66%; ND=93%) and reduced degree of development (ossification sites). Conclusion: Mild diabetes led a negative impact on maternal reproductive performance and caused intrauterine growth restriction and impaired fetal development
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A pesquisa teve como objetivo central identificar e analisar as diversas estratégias de permanência e reprodução social dos produtores familiares e os efeitos do Programa Nacional de Fortalecimento da Agricultura Familiar (PRONAF) no município de Urânia - SP. Constata-se que as atividades desenvolvidas externamente a unidade produtiva e principalmente a previdência social rural são importantes na composição da renda dos produtores familiares. Mas, as principais estratégias são de base agrícola, visto que as atividades agropecuárias constituem-se na principal fonte de renda dos produtores familiares, destacando-se a opção por culturas que proporcionam alta rentabilidade por hectare cultivado, tais como: as frutíferas (uva, laranja, caju, dentre outras) e olerícolas (berinjela, jiló, milho verde etc.). Nesse sentido, a relevância das atividades agropecuárias, principalmente a fruticultura, em especial a uva que demanda grandes investimentos em tecnologia, despesas em insumos faz com que o PRONAF desempenhe importante papel para o desenvolvimento das atividades agropecuárias através das modalidades de custeio e investimento no conjunto de produtores familiares pesquisados, apesar de suas limitações no que tange a marginalização de produtores menos capitalizados e atuação exclusivamente vinculada à concessão de crédito. Identificamos que a gestão profissionalizada é um importante elemento para o progresso econômico da unidade produtiva, proporcionando condições mais favoráveis à permanência do produtor familiar na atividade agrícola e a sucessão hereditária na agricultura familiar, que perfaz a minoria dos casos em função da resistência dos jovens em permanecer no espaço rural decorrentes da baixa rentabilidade e de outros fatores como a penosidade do trabalho...(Resumo completo, clicar acesso eletrônico abaixo)
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Pós-graduação em Medicina Veterinária - FCAV
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Pós-graduação em Medicina Veterinária - FCAV
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Pós-graduação em Agronomia - FEIS
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Pós-graduação em Ciências Biológicas (Zoologia) - IBB
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Pós-graduação em Biociências - FCLAS