Detalhes bibliográficos
| Ano de defesa: |
2013 |
| Autor(a) principal: |
Prado, Tayrone Freitas
 |
| Orientador(a): |
França, Aldi Fernandes de Souza
|
| Banca de defesa: |
França, Aldi Fernandes de Souza,
Orsine, Geisa Fleury,
Cabral FIlho, Sérgio Lúcio Salomon |
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Federal de Goiás
|
| Programa de Pós-Graduação: |
Programa de Pós-graduação em Ciência Animal (EVZ)
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| Departamento: |
Escola de Veterinária e Zootecnia - EVZ (RG)
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| País: |
Brasil
|
| Palavras-chave em Português: |
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| Palavras-chave em Inglês: |
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| Área do conhecimento CNPq: |
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| Link de acesso: |
http://repositorio.bc.ufg.br/tede/handle/tede/5396
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Resumo: |
The sheep production in Brazil was always marginal to production of cattle, being the heritage of our colonization. However in recent years the rearing of sheep have been leveraged by demand for lamb meat. So has fetched the production of quality meat, from young animals. To achieve this quality level the intensification of rearing systems with the feedlot finishing is required. However the feedlot finishing is more costly than conventional finishing systems, being necessary to seek food and food additives that bring greater feed efficiency in the system. The purpose of this study was to evaluate the inclusion of amylolytic enzyme (ENZ), protected lysine (LIS), lysophospholipid (LYP) and protected methionine (MET) in a high concentrate diet control (CON) with ground corn meal and cottonseed meal to lambs. We sought to evaluate the ponderal performance at feedlot, quantitative characteristics of the carcass at slaughter, in vitro degradability of dry matter (DIVMS) of the diets and cumulative gas production in vitro. Were used 80 male lambs, not castrated with 20,57 ± 4,33 kg live weight (PV), crossbred Dorper x Santa Ines, being 60 slaughtered at the end of the experiment to evaluate the quantitative characteristics of the carcass. The animals were confined in 20 pens with four lambs each for a period of 64 days and treated twice daily at 7 a.m. and at 5 p.m. In the DIVMS the samples were incubated for 0, 3, 6, 12, 24 and 48 hours at 39°C under anaerobic conditions. Was calculated the degradability of dry matter (MS), estimating the parameters for the construction of degradability curves. The in vitro gas production was determined in the incubation times of 3, 6, 9, 12, 16, 24, 32, 48 and 72 hours, and compared the use of bovine and ovine ruminal fluid. There was no change in the quantitative characteristics of carcass how weight at slaughter (PA), hot carcass weight (PCQ), cold carcass weight (PCF), hot carcass yield (RCQ), cold carcass yield (RCF) and chilling loss (PPR) as result of the use of additives. There was a high correlation of PA with PCQ and PCF. However negative correlations were observed of the PA with RCQ, RCF and PPR, with lower correlation coefficients. Better performances were achieved with feedlot lambs feeding diets with the addition of ENZ and LYP, in the finishing phase. The inclusion of LYP increased DIVMS of diet, and MET decreases this variable. The gas production was greater in sheep inoculum until 48 hours of fermentation, there was no difference in time of 72 hours. The addition of ENZ increased the gases production only until 24 hours of fermentation, but after this period none of the additives tested increased the gases production. |
