38 research outputs found

    Giant fluctuations of topological charge in a disordered wave guide

    Full text link
    We study the fluctuations of the total topological charge of a scalar wave propagating in a hollow conducting wave guide filled with scatterers inside. We investigate the dependence of the screening on the scattering mean free path and on the presence of boundaries. Near the cut-off frequencies of the wave guide, screening is strongly suppressed near the boundaries. The resulting huge fluctuations of the total topological charge are very sensitive to the disorder.Comment: 8 pages 5 figures, submitted to Waves in Random and Complex Medi

    Estrus identification methods as an alternative to optimize IATF results.

    Get PDF
    The objective of the present study was to compare the efficacy of different techniques for detection of estrus in Nellore cows submitted to FTAI protocols and their relationships with fertility

    GnRH application in cows with low or no estrus expression evaluated with tail-chalk increases the pregnancy rate in beef cows submitted to TAI.

    Get PDF
    The objective was to evaluate the GnRH application in cows with low or poor estrus expression evaluated using tail chalk removal Score (ESCT) to increase TAI pregnancy rates.Proceedings of the 30th Annual Meeting of the Brazilian Embryo Technology Society (SBTE); Foz do Iguaçu, PR, Brazil, August 25th to 27th, 2016, and 32nd Meeting of the European Embryo Transfer Association (AETE); Barcelona, Spain, September 9th and 10th, 2016. A083. Título em português: Aplicação de GnRh em vacas com baixa ou sem expressão de estro avaliadas com bastões marcadores aumenta a taxa de prenhez em vacas de corte submetidas a IATF. Na publicação: Juliana Correa Borges

    Suplementação com gordura protegida na produção de leite de búfalas Murrah (Bubalus bubalis): resultados preliminares.

    Get PDF
    Objetivou-se avaliar o efeito da suplementação com gordura protegida na produção de leite de búfalas Murrah.Na publicação: MELO-STERZA, F. A

    Embryos produced in vitro with sexed semen - technique application for superior beef calves production.

    Get PDF
    Due the relevance of the Zebu and the increasing use of production in vitro (PIV) of embryo in Brazil, we evaluated the pregnancy rates of Nelore recipients inovulated with fresh or vitrified IVP embryos obtained from Nelore donor oocytes from slaughterhouse (SLAUGHTER, n = 66 embryos) or OPU in vivo (VIVO, n = 299 embryos).Proceedings of the 30th Annual Meeting of the Brazilian Embryo Technology Society (SBTE); Foz do Iguaçu, PR, Brazil, August 25th to 27th, 2016, and 32nd Meeting of the European Embryo Transfer Association (AETE); Barcelona, Spain, September 9th and 10th, 2016. A040. Título em português: Utilização de embriões produzidos in vitro com sêmen sexado ? aplicação da técnica para produção de bezerros de corte superiores. Na publicação: Juliana Correa Borges

    Heat score accessed with aid of tail-chalk influences pregnancy rate of suckled Bos indicus beef cows subjected to P4/estradiol TAI-based protocols.

    Get PDF
    It is known that cows that express estrus submitted to TAI protocols, have better pregnancy rates (Borges et al. 2011). So the goal was to test alternative to visual estrus observation, evaluating the effect of estrus expression with the assistance of tail-chalk on pregnancy rates and the pre-ovulatory follicle diameter in beef cows submitted to TAI protocols with use of two ovulation inducers: estradiol benzoate (EB) and estradiol cypionate (ECP).Proceedings of the 30th Annual Meeting of the Brazilian Embryo Technology Society (SBTE); Foz do Iguaçu, PR, Brazil, August 25th to 27th, 2016, and 32nd Meeting of the European Embryo Transfer Association (AETE); Barcelona, Spain, September 9th and 10th, 2016. A077. Título em português: Escore de cio avaliado com bastões marcadores influencia as taxas de gestação de vacas nelore submetidas a protocolos de inseminação artificial em tempo fixo

    Effects of narasin on the pregnancy rate of Nellore cows maintained under grazing and performance of calves - preliminary results.

    Get PDF
    Ionophores have been used to improve forage conversion in animal protein and to increase nutrient utilization efficiency in cattle. The effects of the mineral mix (MM) with addition of narasin (Zimprova®; Elanco, Brazil) on the performance of calves and pregnancy rate of Nellore cows were evaluated.Edição dos Proceedings of the 32nd Annual Meeting of the Brazilian Embryo Technology Society (SBTE)

    Efficiency of post FTAI manegement in lacting beef cows.

    Get PDF
    The study aimed evaluate the effectiveness of TAI post reproductive management in lacting beef cows. Were inseminated at fixed time, 607 Nellore multiparous with 45 days postpartum, calved in November and inseminated with 5 Angus bulls in January 2015 in MS state farm.Proceedings of the 30th Annual Meeting of the Brazilian Embryo Technology Society (SBTE); Foz do Iguaçu, PR, Brazil, August 25th to 27th, 2016, and 32nd Meeting of the European Embryo Transfer Association (AETE); Barcelona, Spain, September 9th and 10th, 2016. A078. Título em português: Eficiência das técnicas de manejo reprodutivo pós-inseminação artificial em tempo fixo (IATF) em vacas de corte paridas. Na publicação: Juliana Correa Borges

    IATF + CIO: estratégia prática de avaliação de cio e aumento de prenhez.

    Get PDF
    Devido à relativa baixa eficiência reprodutiva observada nos rebanhos bovinos brasileiros, é primordial desenvolver formas de conhecer, controlar e melhorar índices reprodutivos (taxa de prenhez, índice de serviço, intervalo de partos, taxa de natalidade). Programas de Inseminação Artificial em Tempo Fixo (IATF) estão sendo utilizados em larga escala por apresentarem inúmeras vantagens, sendo a principal delas a eliminação da observação de cio, evitando a inseminação de vacas no momento incorreto, otimizando a utilização do sêmen e da mão-de-obra. A IATF serve também para concentrar as inseminações e as parições em épocas desejáveis, induzir a ciclicidade de vacas em anestro, diminuir o intervalo de partos, programar as inseminações em um curto período de tempo, controlar a propagação de doenças sexualmente transmissíveis, diminuir os investimentos com touros, padronizar os lotes por categoria e escore de condição corporal e reduzir o descarte e o custo de reposição de matrizes.bitstream/item/157420/1/CT113.pd
    corecore