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Acta Scientiarum. Animal Sciences

On-line version ISSN 1807-8672

Abstract

SILVA, Jackeline Thaís da; BITTAR, Carla Maris Machado  and  FERREIRA, Lucas Silveira. Performance and rumen development of dairy calves in early weaning system receiving humic substances in starter concentrate. Acta Sci., Anim. Sci. [online]. 2011, vol.33, n.4, pp.395-401. ISSN 1807-8672.  http://dx.doi.org/10.4025/actascianimsci.v33i4.10907.

The objective of this work was to evaluate the inclusion of humic substances in starter concentrate on the performance of dairy calves and rumen development. Twenty Holstein calves were used in a completely randomized block design and distributed in two treatments according to inclusion of humic substances in concentrate: 1) Control; 2) Humic substances. Animals received 4 L d-1 liquid diet and starter concentrate ad libitum. Fecal score analyses were carried out daily, and calves were weighed weekly and growth measurements and blood samples for glucose, urea-N and β-hidroxibutyrate (BHBA) were taken. The calves were weaned at eight weeks of age and slaughtered for evaluation of forestomach development. There were no effects (p > 0.05) between treatments or treatment x age interaction for concentrate intake, weight gain, growth measurements or blood parameters. Fecal scores and rumen development were not affected (p > 0.05) by the inclusion of humic substances. There were no benefits from the inclusion of humic substances in starter concentrate on performance or rumen development of dairy calves.

Keywords : fulvic acid; humic acid; fecal score; ruminal papillae.

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