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Archivos de Zootecnia

On-line version ISSN 1885-4494Print version ISSN 0004-0592


VELAZQUEZ, A.J. et al. Chemical composition and in vitro gas production of diets with Acacia farnesiana pods. Arch. zootec. [online]. 2011, vol.60, n.231, pp.637-645. ISSN 1885-4494.

The inclusion of Acacia farnesiana pods into lamb diets was evaluated by means of analyzing its chemical composition, tannin content and in vitro gas production, dry matter disappearance and metabolizable energy. The treatments with different inclusion levels of A. farnesiana pods were 0, 100, 200, 300 and 400 g/kg DM, within isoprotein diets for lambs which included ground maize fodder, soybean meal, wheat bran and mineral mix. The A. farnesiana pods contributed with an important amount of protein (115 g/kg), and tannins (7.8 g/kg). in vitro gas production decreased (p<0.05) with the inclusion of 400 g/kg DM (304.45 ml/g DM); nonetheless, its production was similar to 300g/kg (317.88 ml/g DM). in vitro dry matter disappearance (IVDMD) in 0 and 100 g/ kg was similar between them with 70.14 and 68.73 mg/100 mg DM respectively; however, they were different than the rest of the treatments. Relative gas production was similar between 200 to 400 g/ kg, nevertheless it was different to control diets. It is concluded that the inclusion of 300 g/kg DM of A. farnesiana pods has a negative impact over in vitro gas production and metabolizable energy, and over 200 g/kg DM affect the dry matter disappearance and relative in vitro gas production, which limit its use for feeding ruminants.

Keywords : Food scarcity; Leguminous shrub; Production systems; Tannins.

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