Resumo

FERNANDEZ, A. E; STUART, R. J; CHONGO, Bertha  e  MARTIN, P. C. Finishing of British steers under grazing conditions, supplemented with high-tannin sorghum grain. Pastos y Forrajes [online]. 2013, vol.36, n.2, pp. 238-245. ISSN 0864-0394.

The objective of this experiment was to finish British steers with 18 years of age and 380 kg of LW, with the lowest possible production cost. The impact of high-tannin sorghum grain on meat production was also evaluated. The research was conducted at the experimental field Cesáreo Naredo of the INTA Bordenave, in Buenos Aires, Argentina, during two stages; in the first one (254 days) the treatments were: T1) 20 pure red Aberdeen Angus (AAr) calves, of 183,4 kg LW and T2) 18 bull calves AAr x Shorthorn (AAr x Sh) of 183,6 kg LW; and in the second one (247 days), 45 calves AAr x Sh of 218,4 kg LW, in just one treatment. A mixed pasture based on alfalfa and supplements of dried and ground sorghum grain at a rate of 1 % of the LW were used. The grain intake was 2,97 and 3,38 kg grain head^-1 day^-1, while the daily weight gain was 0,891 and 0,969 kg^-1 head^-1 day^-1 for the first and the second stage, respectively. Meat production was 452,12 and 567,24 kg ha^-1, and the production cost was 0,57 and 0,54 USD per produced kilogram, respectively. In the first stage the quadratic model showed a better adjustment with high R² (0,99) and lower mean squared error (MSE 33,26). In the second stage the linear model showed the best adjustment with high R² (0,99) and lower MSE (44,78). The productive and economic values were very adequate. No negative effect of tannins was observed in the evaluated indicators.

Palavras-chave : steer; meat production; Sorghum bicolor.

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