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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

UtilizaÃÃo de trÃs modelos de produÃÃo de carne ovina na regiÃo semi-Ãrida do Brasil / Using three models of sheep meat production in the semiarid region of Brazil

MarcÃlio Costa Teixeira 30 June 2010 (has links)
CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior / O objetivo deste estudo foi o de determinar o desempenho reprodutivo de ovelhas Santa InÃs, mantidas em trÃs modelos de produÃÃo visando determinar a influÃncia do grau tecnolÃgico na reproduÃÃo dos animais. Durante trÃs anos foram avaliadas 150 ovelhas divididas no inicio do experimento em trÃs grupos homogÃneos quanto à idade e peso corporal, sendo cada grupo submetido a trÃs modelos de produÃÃo diferente. No Modelo 1 as ovelhas foram acasaladas trÃs vezes em dois anos, mantidos em pastagem nativa (caatinga) durante o acasalamento (Ãpoca chuvosa) e em pastagem cultivada (Ãpoca seca) durante o perÃodo do terÃo final da gestaÃÃo atà o acasalamento seguinte. No Modelo 2, as ovelhas foram acasaladas uma vez ao ano com repetiÃÃo de cobertura, cinco meses apÃs a primeira, mantidas em pastagem nativa antes, durante e apÃs o acasalamento (Ãpoca chuvosa) e em pastagem cultivada durante o perÃodo final de gestaÃÃo e a lactaÃÃo (Ãpoca seca). No Modelo 3, as ovelhas foram acasaladas uma vez ao ano, e mantidas exclusivamente em pastagem nativa, com suplementaÃÃo na forma de feno no perÃodo seco. Todos os animais receberam suplementaÃÃo mineral ao longo do perÃodo experimental. Houve influÃncia significativa do modelo de produÃÃo e do ano de observaÃÃo nos pesos corporais das matrizes ao acasalamento, pariÃÃo e desmame e Ãndices calculados, com valores significativamente superiores no Modelo 1 e no ano de 2008. Conclui-se que o nÃvel tecnolÃgico influi significativamente no peso corporal e nos parÃmetros reprodutivos de ovelhas na regiÃo semi-Ãrida do Brasil, sendo viÃvel trÃs pariÃÃes em dois anos. / The objective of this study was to determine the reproductive performance of Santa InÃs ewes maintained in three production models to determine the influence of the technological level in the reproduction of animals. During three years 150 sheep were assessed before the treatment period divided into three equal groups according to age and body weight, each group being subjected to three different production models. In Model 1, ewes were mated three times in two years, maintained in native grassland (caatinga) during the mating season (rainy season) and pasture (dry season) during the third trimester of gestation until the next mating. In Model 2, ewes were mated once a year with repeat coverage, five months after the first, kept on native pasture before, during and after the mating season (rainy season) and cultivated pasture during late gestation and lactation (dry season). In Model 3, ewes were mated once a year and kept on native pasture with supplementation in the form of hay in the dry season. All animals received mineral supplementation throughout the experimental period. Significantly influence the production model and year of observation in the body weights of the sheep at mating, calving and weaning rates and calculated, with values significantly higher than in Model 1 and in year 2008. It is concluded that the technological level has a major influence on body weight and reproductive performance of sheep in semi-arid region of Brazil, with three viable calving at two years.

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