Two experiments were accomplished with the objective to evaluate the in vitro efficiency of the propolis extract to inhibit the gas production from ruminal fermentation of different feeds. In the first experiment, 100 mg of ground brachiaria dry matter hay was incubated, in absence (0.2 mL of alcoholic solution at 70.0% in water) or presence of 0.2 mL of propolis extract (extraction of 3 g of propolis in triturated stone for each 10 mL of alcohol at 70%, for ten […]

The objective of this study was the evaluation of the effects of grain processing (steam-rolled vs. steam-flaked) and monensin on ruminal parameters. Sixteen Holstein calves were ruminally canulated with 3 to 5 days of life, and utilized on a completely randomized design block with a 2 x 2 factorial arrangement. The animals received concentrate ad libitum up to 2 kg/d, plus 4 L/d of milk. Calves had free access to water. After weaning at the eight weeks of life, calves […]

The supplementation of more digestible starch sources and feed additives with coccidiostatic and growth promoting activities may improve pre and post weaning calves performance. The objective of this trial was to evaluate the effects of concentrates containing processed grains (steam-flaked vs. steam-rolled), with or without monensin, on intake, weight gain and blood parameters of baby calves, before and after weaning at six weeks of life. Thirty-two female calves were utilized on a completely randomized block, with a 2 x 2 […]

The objective of this experiment was to study the in vitro effects of the ionophores on ruminal fermentation of amino acids. Rumen fluid of a steer fed an elephant-grass based diet was used in the incubations, with addition of casein hydrolysate, in three treatments (control-C; monensin-M; and lasalocid-L). Inocula were transferred into new tubes, daily and on the 11th day of incubation, tubes from each of the treatments were used to inoculate three new tubes (C, M, L), totalizing nine […]

Feedlot parameters of two categories of cull females, cows and heifers, fed two diets, with and without monensin, were studied. The daily amount of monensin supplied was 150 mg/animal. The roughage:concentrate ratio was 65:35. The roughage used was sorghum silage. The inclusion of monensin to the diet caused a significant reduction of the daily voluntary dry matter intake (DDMI), which was more pronounced for the cows (9.1%) than for the heifers (1.7%). The animal category x diet interaction affected significantly […]

The objective of this research was to evaluate the effects of soybean oil (500 mL/animal/day), Rumensin® (3g/animal/day) and levels of concentrate (0, 25, 50 and 75%) in the diet of bovines, and sugarcane as a forage source, in some ruminal parameters and dry matter intake. There were used four rumen fistulated 7/8 holstein-zebu steers, at 400 kg of live weight. The experiment consisted of four periods of 15 days, in which 12 were for adaptation to the diets and three […]

The experiment was conducted to evaluate the performance of beef heifers with average age of ten months and average initial weight of 200 kg, grazing cultivated annual temperate grasses mixtures supplemented with salt plus lasalocid or salt. Spread sowing ocurred on 04/21/95, being the area fertilized with 200 kg/ha of 05-30-15. Nitrogen fertilization in the form of urea (175 kg/ha of N) was subdivided in four applications. The establishment of the pasture occured from 04/21 to 06/08 and the experimental […]