<b>Performance and rumen development of dairy calves in early weaning system receiving humic substances in starter concentrate</b> - doi: 10.4025/actascianimsci.v33i4.10907

  • Jackeline Thais da Silva ESALQ/USP
  • Carla Maris Machado Bittar ESALQ - USP
  • Lucas Silveira Ferreira ESALQ/USP
DOI: https://doi.org/10.4025/actascianimsci.v33i4.10907
Keywords: fulvic acid, humic acid, fecal score, ruminal papillae

Abstract

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

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Author Biographies

Jackeline Thais da Silva, ESALQ/USP
Mestre e Ciência Animal e Pastagens - Depto. de Zootecnia - ESALQ/USP
Carla Maris Machado Bittar, ESALQ - USP
Dtualmente trabalha junto ao Depto. de Zootecnia da ESALQ/USP, sendo responsável pelo Laboratório de Bromatologia, adequando e aprimorando métodos de análise, incluindo a utilização de NIRS, e orientando alunos de graduação e pós-graduação. Além disso, conduz pesquisas com bovinos leiteiros em crescimento, principalmente na área de desaleitamento precoce. Currículo Lattes
Published
2011-04-28
How to Cite
Silva, J. T. da, Bittar, C. M. M., & Ferreira, L. S. (2011). <b>Performance and rumen development of dairy calves in early weaning system receiving humic substances in starter concentrate</b&gt; - doi: 10.4025/actascianimsci.v33i4.10907. Acta Scientiarum. Animal Sciences, 33(4), 395-401. https://doi.org/10.4025/actascianimsci.v33i4.10907
Issue
Vol 33 No 4 (2011)
Section
Animal Production

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