Twelve 7/8 Holstein-Zebu steers were used in three 4 x 4 latin square design, consisted of three body weight groups (250, 350 e 450 kg), individualy housed in covered pens, during 60 days (four periods of 15 days). Each group of four animals were fed during four periods, with “Napier” grass (Pennisetum purpureum) and supplements constituted of four types of poultry litter (wood shavings, chopped corn cobs, coffee hulls and chopped and dry elephant grass “Cameroon”), urea and concentrate based […]

The objective of this paper was evaluate ammonia concentration, pH of ruminal liquid and microbial synthesis efficiency in diets with different energetic sources: corn (CO), corn/cassava hulls (CC), cassava root (CR) and cassava by-product flour (CB). Four Holstein steers (270 kg) were used, in a 4 X 4 Latin Square design. The marker utilized for determination of duodenal and fecal flow was the acid insoluble ash. There was not effect in the ruminal pH of the experimental diets, however smaller […]

The influence of the level of intake of elephantgrass, under grazing, on the composition of digesta and on concentration of the marker Cr2O3 throughout the gastrintestinal tract (GTI) of bovines was studied. A split-plot completely randomized design with twelve treatments in the main plots (a 2×6 factorial with two levels of forage ingestion: restricted – NA1 and unrestricted – NA2, and six slaughter periods) and the five sections of GTI in the split-plots was used. Thirty six steers were used, […]

The effects of the addition of bakery waste (BW) replacing corn in the diet of Holstein steers was studied on carcass dressing and meat quality. Four treatments were applied, respectively, 0%, 10%, 20% and 30% of bakery waste replacing corn in the concentrated mixture. The animals were fed with complete pelleted mixtures, with 30% of Coast-cross hay (Cynodon dactylon L.) as roughage. A randomized block design with four treatments and five repetitions, total of 20 animals, was used. The experiment […]

Fourty Aberdeen Angus steers were used to evaluate the effects of monensin, soybean oil and nitrogen source (soybean meal or urea) on feedlot performance of steers fed 90% concentrate diets. The monensin decreased dry matter intake of soybean meal supplemented diets and decreased the body weight at 56 and 112 days. The soybean oil decreased the average daily gain from days 57 to 112 and 1 to 112. While, monensin showed a decreased on the average daily gain in these […]

The work was carried out to evaluate the microbial protein production determination by means of the urinary excretion of purine derivatives; to compare the microbial protein production by means of purine base methods and of the urinary excretion of purine derivatives; to determine the microbial protein production on the dry matter intake and percentage of neutral detergent fiber in the diet; and to establish the allantoin: uric acid ratio, in relation to the xanthine and hypoxanthine in the urine. Five […]

The work was carried out to evaluate the plasma N-urea concentration (NUP), the urea fractional excretion (UFE) and the creatinine (CE) and urea (EU) excretions for several experimental conditions; to establish the relation among NUP, the urea fractional excretion and the urea excretion with the dietary crude protein (CP) and NDF percentage; and to evaluate the urinary endogenous losses, by means of the creatinine excretion determination. In the experiments I and II, diets with 25.0, 37.5, 50.0, 62.5, and 75.0% […]

The experiment was conducted to evaluate the ruminal pH and ammonia concentration (N-NH3) in rumen liquor collected at 3, 6 and 12 hours after feeding using four ruminal fistulated European x Zebu steers. The forage leaves: stems ratio and neutral detergent fiber (NDF) and acid detergent fiber in situ ruminal degradability of the leaflets from three tropical legumes (leucaena, Leucaena leucocephala; pigeon pea, Cajanus cajan; and glycine, Neonotonia wightii) and leaves from two others tropical forages (ramie, Boehmeria nivea and […]

Forty-eight crossbreed beef cattle were used to evaluate four commercial mineral supplements: Treatment A- Salt + protein without urea (20% crude protein); B – salt + protein with urea (52,5 % crude protein), C) mineralized salt; D) mineralized salt with urea (91% crude protein). The animals were distributed into 24 plots of Braquiaria decubens grass, with supplementation of (10.5 kg/an/day) of sugar cane, during 112 days, with 28 days of adaptation and 84 days of data collection. The animals were […]