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