Resumen

CAPELLARI, A et al. Caracteres pre-faena de novillos tipos Braford y Brangus del nordeste argentino. Rev. vet. [online]. 2013, vol.24, n.1, pp.39-43. ISSN 1669-6840.

The objectives of the assay were to evaluate the influence of the feeding system (natural grassland vs cultivated pasture) and the approximate age (estimated by number of permanent teeths) on the production of two types of steers (Braford and Brangus), through variables evaluated in vivo previous to the slaughter of animals in four areas of northeastern Argentina. Considering the characteristics of soil, climate, vegetation and productive activity, the farms selected for this trial corresponded to several "homogeneous agroeconomical areas" (HAA). Farms from the Province of Corrientes (General Paz in the HAA I and Santo Tome in the HAA III departments, respectively), Formosa (Patiño in the HAA 8 department) and Chaco (Independencia in the HAA 2 department), were included in this trial. After the fattening period, results obtained on 176 long cycle steers through parameters like individual final weight measured by scale, body condition (BC: scale 1-9), rib eye area (REA) and dorsal fat thickness (DFT) determined by ultrasound technique, were evaluated. The analysis of the variance included the effects type, feeding and "mouthing" (2, 4, 6 and 8 permanent teeths), with an alpha risk of 5%. Differences on steers slaughter weight were not significant between types and feeding systems. Brangus type steers finished the fattening period with a higher BC and Braford type steers with a superior REA and DFT, being in both cases statistically significant in 2-4 years old steers fed on cultivated pasture.

Palabras clave : Steer; Age; Food; Slaughter weight; Ribeye area; Dorsal fat thickness.

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