IADIZA   20886
INSTITUTO ARGENTINO DE INVESTIGACIONES DE LAS ZONAS ARIDAS
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Perirenal fatty acid profile of goat grazing on dry areas of Mendoza, Argentina
Autor/es:
PAEZ LAMA, S.; EGEA, V.; FUCILI, M.; GRILLI, D.; GUEVARA J.C.; ALLEGRETTI, L.
Lugar:
Gran Canaria
Reunión:
Conferencia; XI International Conference on Goats; 2012
Institución organizadora:
Gobierno de Canarias-Universidad de las Palmas de Gran Canaria
Resumen:
This study was aimed to determine the fatty acid profiles of goats grazing on desert rangeland of Mendoza, Argentina. Six Criollo male kids were castrated (60 days old) and raised grazing forage species of the natural field until slaughter (12 months). Samples of perirenal fat were taken and sent to the Meat Quality Laboratory, Faculty of Agronomy, UBA, for fatty acid profile determination (by gas chromatography). The goats reached 26.2 kg of live weight at slaughter with a carcass dressing of 49.4 % and a cold carcass weight of 12.9 kg. The saturated (SFA), monounsaturated (MUFA) and polyunsaturated (PUFA) fatty acids percentages were 67.9, 28.8 and 3.2, respectively. These values are very similar to those found in fat depots of other goats and desert sheeps. The main fatty acids were stearic (31.4%), palmitic (27.1%), and oleic (19.0%). The major unsaturated acid (UFA) were oleic constituting 59% of total unsaturated fatty acids. Whereas, the main SFA were stearic and palmitic, comprising 46.2% and 39.8% of total SFA, respectively. An inverse relationship between stearic and oleic acids (r=-0.94, P < 0.001) was found. This, coupled with the high concentration of stearic acid (1.65 times greater than oleic acid) would indicate a relatively high activity of the stearoyl-CoA desaturase enzyme in these grazing goats. The relatively high concentrations of stearic acid could be because forage increases the rumen activity and therefore increases biohydrogenation of dietary UFA. However, this is not a problem for human health since the effect of stearic acid on human cholesterol levels is considered neutral. The percentage of desirable fatty acids (DFA, UFA plus stearic acid) was 63.5, being within the range (64.1% - 67.1%) reported for goats fed with and without concentrate supplementation. The n-6/n-3 ratio (2.55) is within the reported desirable range for human health of less than 5:1. Based on these results, it is possible to conclude that consumers should not consume large amounts of perirenal or internal fat of these goats due to the saturation of their fatty acids. However, based on the lipid profile of perirenal fat, it could be presumed that the meat quality would be good from the viewpoint of human health, despite the tendency of grazing goats to accumulate more saturated fatty acids