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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

Desempenho produtivo e caracter?sticas de carca?a de caprinos com diferentes composi??es raciais. 2010. / Performance and carcass features of purebred and crossbred goat kids. 2010.

Ferreira, Leonardo 24 February 2010 (has links)
Made available in DSpace on 2016-04-28T14:59:40Z (GMT). No. of bitstreams: 1 LeonardoFerreira PDF.pdf: 340498 bytes, checksum: 3f4802a4a87c81e1c9c6d8da02697789 (MD5) Previous issue date: 2010-02-24 / This work was carried out aiming to evaluate the performance of purebred Anglo-Nubian and several Boer crossbreds (1/2 Boer + 1/2 Anglo-Nubian 1/2 BA and 3/4 Boer + 1/4 Undefined breed 3/4 BU) and male carcass features. 12 males and 12 females were confined and artificially milked twice a day with cow and goat milk, in rate of 1:1. From the second week on they received Tifton hay and concentrate, in rate of 40:60. They were weighed at birth and weekly early in the morning, before feeding. Zoometrical measurements were made in the morning even two weeks. The male kids were slaughtered between 20 and 25 kg of body weight. The crossbreds 3/4 BU were greater than others genetic groups in weight gain, denoting the Boer percentage influence in the crossbreds. However the crossbreds 1/2 BA weren?t greater than Anglo-Nubians purebred in weight gain. Therefore, the Boer genes percentage didn?t improvement the offspring results. The crossbred advantages in weigh at slaughter and empty body weight didn?t influence in carcass traits majority. Nevertheless, as bigger the Boer genes percentage, the fatter was the carcass. This may suggests a better carcass protection to cold shortening. The Hankins & Howe?s prediction equations, for carcass bovine evaluation, were not consistent to kid goats carcass. Was impossible to develop bone tissue prediction equation by HH section. On the other hand, the shoulder allowed a trustful prediction of tissue composition of carcass. / Este trabalho foi realizado objetivando avaliar o desempenho produtivo de cabritos e cabritas Anglo-Nubianos e mesti?os Boer x Anglo-Nubiana (1/2 BA) e 3/4 Boer + 1/4 sem ra?a definida (3/4 BS) e as caracter?sticas de carca?a dos machos. Utilizaram-se 12 cabritos e 12 cabritas, que foram mantidos totalmente confinados, sendo amamentados com leite de cabra e de vaca em uma propor??o de 1:1. A partir da segunda semana de idade os cabritos foram alimentados com feno de tifton e concentrado farelado, em uma rela??o de 40:60. Os animais foram pesados, ao nascimento e semanalmente pela manh?. As medi??es zoom?tricas foram realizadas quinzenalmente. Os cabritos foram abatidos com peso corporal entre 20 e 25kg. Os mesti?os 3/4 BS foram superiores aos demais grupamentos raciais no desenvolvimento ponderal, o que indicou a influ?ncia da composi??o racial Boer nos mesti?os. Entretanto tal superioridade n?o foi observada no comparativo entre os mesti?os 1/2 BA e os Anglo-Nubianos, denotando n?o ter havido melhoramento na F1 por influ?ncia do grau de sangue Boer. Os melhores resultados dos mesti?os Boer sobre os Anglo-Nubianos nos pesos ao abate e do corpo vazio n?o se refletiram na maior parte das caracter?sticas da carca?a. Contudo, o percentual Boer dos mesti?os determinou maior propor??o de gordura na carca?a, podendo indicar uma melhora na prote??o da carca?a em rela??o ao encurtamento pelo frio, no seu armazenamento em baixas temperaturas. As equa??es propostas por Hankins & Howe, para avalia??o de carca?as bovinas, n?o s?o compat?veis para carca?a de caprinos jovens. N?o foi poss?vel desenvolver equa??o de predi??o para propor??o do tecido ?sseo a partir da sec??o HH. Por outro lado, a utiliza??o da paleta possibilitou a predi??o confi?vel da composi??o tecidual da carca?a.

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