SUMMARY
Moisture, total lipids and fatty acids in raw longissimus muscle from Venezuelan cattle
Randomly selected groups of slaughter cattle, crossbreds of dairy (n=14) and zebu (n=131) types were classified by age (2.5, 3.0, 3.5 and 4.0 yr., estimated by dentition), and carcass fatness (as described by different criterion, including marbling levels) to study variation in moisture (M), lipid (L), and fatty acid (FA) contents (g/l00g of fresh tissue) of longissimus muscle trimmed to zero fat cover. Overall means ± standard deviations per 100 g of raw product for M and L were 73.9±l.36 and 2.9±1.04, respectively. Analyses of variance by the east squares (LS) method showed age, breed type, marbling, backfat thickness and carcass finish affected (p<0.05) fatty acid (FA) profiles. The oldest cattle group (4 yr. or older) trended to present a lower intramuscular lipid content (2.72 g/100g) and showed the highest (2.04) unsaturation (unsaturated/saturated FA) index (p<0.05). Breed type had little effect on the FA profile. Comparison of LS means showed intramuscular concentrations of myristic and linolenic acids were slightly higher in samples from dairy types (p<0.05). Carcasses with poor, "patch-like" fat distribution, showed muscles with the highest (0.16) polyunsaturated/saturated FA index (p<0.05). Unsaturation indexes for trimmed beef samples with the prevailing marbling levels (1.76 for "Traces" to 1.92 for"Devoid") show a clear predominance of unsaturates, relatively larger than that estimated from compositional FA data reported for the same cut in the United states.

Key words: Fatty acid, meat, beef, breed types, longissimus.



Recibido: 20/04/1998
Aceptado: 04/03/1999

HOME > EDICIONES > Año 1999, Volumen 49 - Número 2 Ir al principio

PRIVACIDAD | ACCESIBILIDAD ALAN-VE ISSN 0004-0622 - Depósito Legal: pp 199602DF83 Sociedad Latinoamericana de Nutrición Producción editorial en Venezuela: Capítulo Venezolano - RIF: J-30843129-0 Urbanización Santa María, primera transversal, No. 417-214, Planta Alta Tele-Fax: (+58-212) 283.8618 E-mail info@alanrevista.org Código Postal: 1070 Caracas - Venezuela