Effects of sodium lasalocid and roughage/concentrate ratio on in situ degradability of soybean meal and Coast Cross hay [Cynodon dactylon (L.) Pers.] in dry cows
AbstractSodium lasalocid and different roughage:concentrates ratios were studied in a 4 x 4 change over design, with four canulated heifers, weighing 500 kg of average body weight. Treatments were applied in a 2 x 2 factorial arrangement with 40% or 70% of roughage (39% or 59% NDF in the diet) and zero or 200 mg of lasalocid/animal/day. Twenty-one days subperiods were used, the first sixteen for diets adaptation, constituted by Coast Cross hay and concentrate mixture. In situ degradability assay was runned from day seventeen to twenty-one. Statistical interaction between roughage:concentrate ratio and lasalocid was detected over hay NDF and ADF contents (p < 0.05): without lasalocid, less roughage in the diet decreased NDF and ADF degradabilities 12.0% and 12.7% respectively, but with lasalocid the decreasing rates were 7.0% and 4.9%. There were no differences among treatments for protein degradability of soybean meal.
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