Effects of sodium lasalocid and roughage/concentrate ratio on ruminal fermentation in dry cows

Authors

  • Paulo Henrique Mazza Rodrigues Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Nutrição e Reprodução Animal, São Paulo, SP
  • Carlos de Sousa Lucci Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Nutrição e Reprodução Animal, São Paulo, SP
  • Ari Luiz de Castro Universidade de São Paulo, Faculdade de Medicina Veterinária e Zootecnia, Departamento de Nutrição e Reprodução Animal, São Paulo, SP

DOI:

https://doi.org/10.1590/S1413-95962000000300014

Keywords:

Ionophores, Volatile fatty acids, Ammonia, Ruminants

Abstract

Sodium lasalocid and different roughage:concentrates ratios were studied in a 4 x 4 change over design, with four canulated heifers (500 kg body weight). Treatments were applied in a 2 x 2 factorial arrangement with 40% or 70% of roughage (Coast Cross hay) and zero or 200 mg of lasalocid/animal/day. Ruminal liquid collections were made at the twentieth first day of each experimental subperiod at 0, 1, 2, 3, 4, 6, and 8 hours after first meal. Statistical interaction between lasalocid and roughage:concentrate ratio was detected in molar percentage of propionate (p < 0.05): lower roughage diet increased propionate 19.0% with lasalocid but only 0.6% without. Also, lower roughage diet decreased acetate:propionate ratio 20.6% with and only 4.9% without lasalocid (p < 0.05). Acetate was 4.7% lower and butirate 15.7% greater at the 40% roughage diet, with or without lasalocid (p < 0.05). Lower roughage diets increased DM consumption (p < 0.05), decreased ruminal ammonia concentration since four hours after the first meal (p < 0.05), decreased ruminal pH since two hours after the first meal (p < 0.05) and decreased ruminal liquid turnover by quilogram of DM consummed (p < 0.05), but did not result in differences of liquid ruminal volume or blood urea concentrations.

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Published

2000-01-01

Issue

Section

ZOOTECHNICS

How to Cite

Effects of sodium lasalocid and roughage/concentrate ratio on ruminal fermentation in dry cows. (2000). Brazilian Journal of Veterinary Research and Animal Science, 37(3), 253-258. https://doi.org/10.1590/S1413-95962000000300014