<b>Replacement of soybean meal by conventional and coated urea in dairy cows: intake, digestibility, production and composition of milk</b>

  • Geógenes da Silva Gonçalves Universidade Estadual do Sudoeste da Bahia
  • Marcio dos Santos Pedreira Universidade Estadual do Sudoeste da Bahia
  • José Augusto Gomes Azevedo Universidade Estadual de Santa Cruz
  • Antonio Jorge Del Rei Universidade Estadual do Sudoeste da Bahia
  • Herymá Giovane Oliveira Silva Universidade Estadual do Sudoeste da Bahia
  • Fabiano Ferreira Silva Universidade Estadual do Sudoeste da Bahia
Palavras-chave: conventional urea, dry matter intake, slow-release urea

Resumo

This study evaluated the effect of dairy cows’ diets containing two different sources of urea on dry matter intake, nutrient apparent digestibility, and milk production and composition. Eight crossbred cows (Holandês x Zebu) were confined and randomly assigned to four sequential diets distributed in two 4 x 4 Latin: SM = soybean meal; SRU 0 = conventional urea (CU) 100%/slow release urea (SRU) 0%; SRU 44 = CU 56%/SRU 44%; SRU 88 = CU 12%/SRU 88%. Experimental periods consisted of 21 days, with total duration of 84 days. Dry matter intake, neutral detergent fiber, organic matter, crude protein, and total digestible nutrients were not affected by experimental diets. Dry matter and neutral detergent fiber digestibility coefficient presented average values of 69.43 and 51.07%, respectively. Average digestibility of crude protein was 65.43%. Average milk production was 9.609 kg. The partial replacement of soybean meal by conventional urea and slow release urea, at 2.1% of the diet dry matter, showed that these sources of urea can be offered without production impairment for dairy cows.

 

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Biografia do Autor

Geógenes da Silva Gonçalves, Universidade Estadual do Sudoeste da Bahia
Geógenes da SilvaGonçalves  curso de Pós-Graduação em Zootecnia – Doutorado em Zootecnia na Universidade Estadual do Sudoeste da Bahia – UESB, Concentração em Produção de Ruminante.
Publicado
2014-03-18
Como Citar
Gonçalves, G. da S., Pedreira, M. dos S., Azevedo, J. A. G., Del Rei, A. J., Silva, H. G. O., & Silva, F. F. (2014). <b>Replacement of soybean meal by conventional and coated urea in dairy cows: intake, digestibility, production and composition of milk</b&gt;. Acta Scientiarum. Animal Sciences, 36(1), 71-78. https://doi.org/10.4025/actascianimsci.v36i1.21314
Seção
Nutrição de Ruminantes

0.9
2019CiteScore
 
 
29th percentile
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