Utilize este identificador para referenciar este registo: http://hdl.handle.net/10348/2326
Título: Comparison of splanchnic tissues mass of two sheep breeds offered two diets differing in roughage level
Autor: Gomes, M.J.
Silva, Severiano
Azevedo, Jorge Manuel Teixeira de
Mena, Elizabete
Lourenço, A.
Silva, Arnaldo Dias da
Data: 2009
Resumo: It is a general believe that the local sheep breed Churra da Terra Quente (CTQ), reared in the Northeast of Portugal is well adapted to the conditions of its production system. However, there are large gaps on our knowledge to allow understanding of such claimed adaptation. Splanchnic tissues (ST) can account for 35-50% of body energy expenditure, this high demand for energy being positively related with the protein and cell turnover, which in turn allows adaptability and flexibility so that animals can respond to multiple physiological and environmental challenges. The objective of the present study was to compare ST weights of lambs from CTQ and from an exotic breed (Ile de France, IF) at the same mature body weight (MBW) and fed two diets differing in roughage level. The study was carried out with 15 female lambs from each of the two breeds. Initial body weight was 20.7±1.3 and 34.0±0.7 kg, for CTQ and IF respectively, corresponding to ca 45% of their MBW. Animals were assigned to be slaughtered as an initial group or when they reached ca 65% of their MBW, after being fed ad libitum a high (HR, 70% of meadow hay) or a low-roughage diet (LR, 25% of meadow hay), according to a 2x2 factorial design. ST were removed and weighed. Per kg empty BW, CTQ had higher weights of small intestine, large intestine, liver and total ST (P<0.05), the weights of rumen-reticulum and omasum being higher only at 65% of MBW (P<0.01). Weights of the rumen-reticulum, omasum, large intestine and total ST were higher (P<0.001) in sheep fed HR diet irrespective of breed, but no differences were observed for the weight of abomasum, small intestine and liver (P<0.05). This study confirms the existence of differences on relative weights of ST between sheep breeds at the same level of maturity and between animals fed diets with different roughage levels. In conclusion, the high ST weights of the local breed may lead to enhanced adaptation ability to its environment.
Revisão por Pares: yes
URI: http://hdl.handle.net/10348/2326
Tipo de Documento: Objecto de Conferência
Aparece nas colecções:OLD - DZOO - Artigo em Conferência Internacional

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