Avaliação bioeconômica do confinamento de borregos Santa Inês abatidos em diferentes pesos

• Ano de defesa: 2020
• Autor(a) principal: Brito Neto, Antonio de Sousa
• Orientador(a): Pimentel, Patrícia Guimarães
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Consumo; Crescimento; Ganho de peso; Peso corporal; Viabilidade econômica
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/56137

The adequacy of production systems to accurate information about the slaughter weight can maximize the productive and economic gains, as well as standardize the product and the offer for the market. Aimed with this study to evaluate the consumption, apparent digestibility of nutrients, morphometric measures in vivo, carcass characteristics, non-carcass components and the economics of confinement of Santa Ines lambs slaughtered at different weights, for the purpose of defining the ideal slaughter weight. Were used 24 Santa Ines non-castrated lambs, with initial average body weight of 16.52 ± 1.92 kg and approximately 80 days of age. Four slaughter weights were evaluated (26; 32; 38 and 44 kg). The experimental design used was completely randomized with four treatments and six repetitions. The duration of the experiment was determined by the time necessary for the average body weight of each group to reach the respective weight evaluated. The dry matter consumption expressed in g day-¹, and the food conversion was increasing with the increase in body slaughter weight, which consequently reduced feed efficiency. For each kg of body weight gained, feed conversion increased by 0.07 units and feed efficiency decreased by 0.002 units. Increasing linear behavior was observed in body weight at slaughter, empty body weight, hot carcass weight and cold carcass weight, adding up to 0.94; 0.88; 0.53 and 0.51 kg for each additional kg in slaughter weight, respectively. The weight of commercial cuts increased as the slaughter weight increased. Regarding the non-carcass components, an increasing linear behavior was verified in the weight of the following constituents: heart, lungs + trachea/tongue + esophagus, pancreas, liver, kidneys, spleen, blood, head, skin, paws, reproductive tract and testicles. The loin eye area and subcutaneous fat thickness were significantly influenced by the slaughter weights, showing an linear increasing effect. The increase in slaughter weight is followed by a reduction in economic return which consequently harm the profitability of the production system. The ideal slaughter weight of non-castrated Santa Ines lambs which represents the balance between maximum economic return and desirable carcass characteristics is 34 kg.