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Acta Scientiarum. Animal Sciences

On-line version ISSN 1807-8672

Acta Sci., Anim. Sci. vol.33 no.4 Maringá Oct./Dec. 2011 

Desempenho e desenvolvimento ruminal em resposta ao fornecimento de substâncias húmicas para bezerros leiteiros em sistema de desaleitamento precoce


Performance and rumen development of dairy calves in early weaning system receiving humic substances in starter concentrate



Jackeline Thaís da Silva; Carla Maris Machado Bittar*; Lucas Silveira Ferreira

Departamento de Zootecnia, Escola Superior de Agricultura "Luiz de Queiroz", Av. Pádua Dias, 11, Cx. Postal 9, 13418-900, Piracicaba, São Paulo, Brasil

Correspondencia para




O objetivo deste estudo foi avaliar a inclusão de substâncias húmicas na dieta sobre o desempenho e o desenvolvimento ruminal de bezerros leiteiros da raça Holandesa. Foram utilizados 20 animais em delineamento experimental em blocos completos aleatorizados, distribuídos nos seguintes tratamentos: 1) controle; 2) substâncias húmicas, via concentrado inicial. Os animais receberam 4 L d-1 da dieta líquida e concentrado inicial ad libitum. Diariamente foram realizadas análise de escore fecal, e semanalmente foram realizadas pesagens, medidas de crescimento corporal e colheita de sangue para a determinação de glicose, N-ureico e β-hidroxibutirato (BHBA). Os animais foram desaleitados na oitava semana de idade e foram abatidos para análise do desenvolvimento do trato digestório superior. Não houve efeito significativo (p > 0,05) entre os tratamentos ou interação tratamento x idade para os parâmetros consumo de concentrado, ganho de peso, medidas de crescimento corporal e parâmetros sanguíneos. Entretanto, foi observado efeito de idade (p < 0,0001) para todos os parâmetros avaliados. O escore fecal e o desenvolvimento ruminal também não foram afetados pelos tratamentos (p > 0,05). Não houve efeito da inclusão de substâncias húmicas na dieta quanto ao desempenho e desenvolvimento ruminal de bezerros leiteiros.

Palavras-chave: ácido fúlvico, ácido húmico, escore fecal, papilas ruminais.


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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*Autor para correspondência

Received on August 16, 2010.
Accepted on March 16, 2011.

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