Effects of sodium lasalocid and roughage/concentrate ratio on ruminal fermentation in dry cows
Keywords:Ionophores, Volatile fatty acids, Ammonia, Ruminants
AbstractSodium 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.
Download data is not yet available.
How to Cite
Rodrigues, P. H. M., Lucci, C. de S., & Castro, A. L. de. (2000). Effects of sodium lasalocid and roughage/concentrate ratio on ruminal fermentation in dry cows. Brazilian Journal of Veterinary Research and Animal Science, 37(3), 253-258. https://doi.org/10.1590/S1413-95962000000300014
The journal content is authorized under the Creative Commons BY-NC-SA license (summary of the license: https://