title: Diet and genotype effects on the quality index of beef produced in the Argentine Pampeana region.
abstract: Steers of varying genotypes (Aberdeen Angus, Charolais x AA and Argentine Holstein) in four feeding systems were evaluated. Feeding systems were: S1=a diet based on pastures only; S2=a similar forage base as S1 plus a daily supplementation with cracked corn, at 0.7% of l.w./head/day; S3=a similar forage base as S1 plus a daily supplementation with cracked corn, at 1.0% of l.w./head/day; and S4=a regular feedlot diet. Tenderness and marbling were not affected by the feeding system. Feedlot meat showed an n-6/n-3 ratio significantly higher than meat produced with the diets based on pastures (S1=2.1; S2=3.1; S3=4.5; S4=14.2) (P<0.05), whereas CLA content had an inverse behavior, showing S1 (0.67%) and S2 (0.64%) higher concentrations than S3 (0.55%) and S4 (0.28%) (P<0.05). Diet based on pastures plus a low level of supplementation produced meat with better nutritional characteristics than other productive alternatives, without significant effects of the biotypes.
authors: Estación Experimental Agropecuaria Marcos Juárez. INTA, CC 21, 2580 Marcos Juárez, Córdoba, Argentina.
authors: N J
authors: NJ
authors: Latimori
authors: A M
authors: AM
authors: Kloster
authors: P T
authors: PT
authors: García
authors: F J
authors: FJ
authors: Carduza
authors: G
authors: G
authors: Grigioni
authors: N A
authors: NA
authors: Pensel