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Registros recuperados: 6
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Economic optimization of the number of recipients in bovine embryo transfer programs Scientia Agricola
Beltrame,Renato Travassos; Barioni,Luis Gustavo; Maestri,Breno Dala; Quirino,Celia Raquel.
Purchase and maintenance of recipient females account for a large proportion of the costs and determine the number of calves that can be produced in an embryo transfer program. However, the large variability of embryo production by the donors and the need to purchase and synchronize the recipients before knowing the number of embryos collected make it difficult for the decision maker to identify the ideal number of recipient females to allocate. An ex-ante evaluation to determine the optimal number of recipient females was carried out through a sensitivity analysis for the ratio between the number of recipients and donors in a simulation model. The variability for the number of embryos collected was accounted for by applying the Monte Carlo simulation...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Monte Carlo; Mathematical model; Simulation; Cost estimation; Estrus synchronization.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300002
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Lamellar keratoplasty in rabbits using an allogeneic free omental graft and omentum-derived mesenchymal cells associated with the canine amniotic membrane Ciência Rural
Barros,Séfora Vieira da Silva Gouvêa de; Aldrovani,Marcela; Lacerda,Luciana Cenço Correa de; Horr,Mônica; Marinho,Fábio Andrade; Lima,Tiago Barbalho; Silveira,Camila Pinho Balthazar da; Brito,Fábio Luiz da Cunha; Bassaneze,Vinícius; Flecher,Mayra Cunha; Beltrame,Renato Travassos; Nakamuta,Juliana Sanajotti; Krieger,José Eduardo; Laus,José Luiz; Oliveira,Krishna Duro de.
ABSTRACT: The objective of this research was to evaluate the clinical and microscopic effects in rabbits of lamellar keratoplasty using allogeneic omentum associated with canine amniotic membrane (AM). Rabbits were divided into two groups: one received the allogeneic free omental graft covered with the AM (OM-graft group), while the other received the AM graft containing omental mesenchymal cells (OM-cell group). Clinical signs were evaluated on different postoperative days. After the clinical assessments, the rabbits were euthanized and their corneas were obtained for histopathology and immunohistochemistry (Ki-67, marker for proliferation). Both groups showed chemosis, blepharospasm, eye discharge, hyperemia, and corneal opacity/edema. Neovascularization...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amniotic membrane; Cornea; Omentum; Progenitor cells; Wound healing..
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016001001838
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Morphometric Indices in Santa Ines Sheep International Journal of Morphology
da Costa,Ricardo Lopes Dias; Quirino,Celia Raquel; Afonso,Vivian Alves Costa; Pacheco,Aline; Beltrame,Renato Travassos; Madella-Oliveira,Aparecida de Fátima; Costa,Aline Mineiro; da Silva,Roberto Machado Carneiro.
The aim of this study was to evaluate the effect of period of the year, year of the birth, sex and age on morphometric indices, such as body capacity, body indices, body side indice, anamorphosis indice, compactness indice and body proportionality indice. The correlation between these characteristics was calculated. Santa Ines sheep offspring from the birth to 12 months-old, at the Estado do Rio de Janeiro were used. Measurements were obtained from animals under an extensive scheme within three years of study totaling 2,601 observations. In this work, the year of birth, sex, animal age and triple interaction between these effects have influenced (P<0.05) morphometric indices. According to body and compactness indices averages also was verified that the...
Tipo: Journal article Palavras-chave: Correlation; Morphometry; Sheep; Weight.
Ano: 2014 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000400039
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Probability density function of the number of embryos collected from superovulated Nelore breed donors Scientia Agricola
Beltrame,Renato Travassos; Barioni,Luis Gustavo; Quirino,Celia Raquel; Dantas,Ozanival Dario.
Several models have been developed to evaluate reproductive status of cows through concentration of progesterone in milk, the effect of sex selection in the commercial production of herds and bioeconomic performance of the multiple ovulation and embryo transfer system in select herds. However, models describing the production of embryos in superovulated females have yet to be developed. A probability density function of the number of embryos collected by donors of the Nelore breed was determined. Records of 61,928 embryo collections from 26,767 donors from 1991 to 2005 were analyzed. Data were provided by the Brazilian Association of Creators of Zebu and Controlmax Consultoria e Sistemas Ltda. The probability density function of the number of viable...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zebu; Cattle; Reproduction; Model.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400003
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Simulação e análise econômica da produção in vivo e in vitro de embriões em bovinos PAB
Beltrame,Renato Travassos; Quirino,Celia Raquel; Barioni,Luis Gustavo; Lima,Vera Fernanda Martins Hossepian de.
O objetivo deste trabalho foi avaliar o efeito das variáveis número de receptoras, protocolo de sincronização, indicadores de eficiência reprodutiva e custo da prenhez na eficiência econômica da produção in vivo e in vitro de embriões, em bovinos. Elaborou-se um aplicativo de simulação que permite ao usuário inserir os parâmetros das variáveis de entrada. Um cenário base, originado a partir de taxas tradicionais de eficiência das técnicas de produção in vivo (TE) e in vitro (PIVE) de embriões bovinos, foi introduzido no aplicativo de simulação como critério para comparação dos resultados. O aplicativo desenvolvido foi capaz de reproduzir os cenários de TE e PIVE. A produção de embriões foi simulada com o uso de simulação estocástica. Posteriormente...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bos taurus; Bovinos; Modelos; Receptoras; Reprodução; Viabilidade.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010001200024
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Simulation and economic analysis of bovine sex selection R. Bras. Zootec.
Beltrame,Renato Travassos; Quirino,Celia Raquel; Barioni,Luís Gustavo; Lima,Vera Fernanda Martins Hossepian de.
A simulation model implemented in the programming software Delphi XE® was applied to evaluate sex selection in bovine. The hypothesis under investigation was that a dynamic model with stochastic and deterministic elements could detect the sexed semen technique to minimize pregnancy cost and to determine the adequate number of recipients required for in vivo (ET) and in vitro embryo production (IVP) in the proposed scenarios. Sex selection was compared through semen sexed using flow cytometry (C1) and density gradient centrifugation techniques (C2) in ET and IVP. Sensibility analyses were used to identify the adequate number of recipients for each scenario. This number was reinserted into the model to determine the biological and financial values that...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Beef cattle; In vitro fertilization; Modeling; Stochastic simulation.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000500003
Registros recuperados: 6
Primeira ... 1 ... Última
 

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