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Acta Scientiarum. Animal Sciences

Print version ISSN 1806-2636On-line version ISSN 1807-8672

Abstract

COSTA, Cleber Thiago Ferreira et al. Multiple supplements containing spineless cactus enriched with urea forcattle. Acta Sci., Anim. Sci. [online]. 2017, vol.39, n.4, pp.363-369. ISSN 1806-2636.  http://dx.doi.org/10.4025/actascianimsci.v39i4.34427.

This study was realized to evaluate the effect of the ‘multiple supplements’ containing spineless cactus enriched with urea (0, 1, 2 and 3% on dry matter basis - DM) as a replacement to a traditional supplement (control) on ruminal parameters and microbial protein synthesis in crossbred steers. Five steers(½ Holstein x Zebu) can nulated in the rumen, with an average initial body weight of 240 ± 22.1 kg were used in a 5 × 5 Latin square. A quadratic effect was observed for DM intake and N retention, with maximum values of 6.97 kg d-1 and 50.9 gd-1 with the inclusion of 1.8 and 2.1% urea, respectively. Maximum concentrations of 16.2, 23.2 and 24.3 mg dL-1of N-NH3were recorded in animals fed spineless cactus enriched with 1, 2, and 3% of urea. There was a quadratic effect on ruminal pH, with a value of 6.45 at 4.08 hours after feeding. Microbial synthesis efficiency of 103 g CPkg-1 TDN was obtained with the inclusion of 1.6% urea. Multiple supplements containing spineless cactus enriched with 1.6 up to 1.8% urea in replacement of a traditional supplement is recommended for cattle.

Keywords : intake; rumen pH; supplementation; volatile fatty acids.

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