Official Holstein cow performance data in Brazil, based on monthly milk weights, is calculated using the correction factors proposed by Everett & Carter (1968) to estimate the partial production from calving to the first daily control in a given lactation. The adequacy of these factors was evaluated using 262 lactations from two herds with daily control of milk production per cow. Data were divided into classes based on age at calving (CIP): CIP 1 (up to 3 years), CIP 2 […]

The digestibility coefficients and the true digestible amino acids content of soybean and soybean by-products were determined using cecectomized adult cockerels. Each one of the 8 feedstuffs evaluated was fed to six cockerels, consuming 15 g at 8:00 A.M. and 15 g at 16:00h P.M., after 24 hours fasting. Simultaneously, six cockerels were fasted to determine metabolic and endogenous losses. After determination of the digestibility coefficients and calculation of the digestible amino acids, prediction equations were simulated to predict the […]

Twenty-nine suckling Canchim calves averaged 107 kg of body weight and 55 days of age were fed with supplement during the wet season, in order to evaluate the performance provided by nutritional adjustments recommended by different systems of evaluation of diets. Supplements were composed of grounded corn grain, cottonseed meal and soybean meal, in agreement with the recommendations of the Metabolizable Protein System (MP); Cornell Net Carbohydrate and Protein System (CNCPS); and Intestine Digestible Protein System (PDI), for the highest […]

It was conducted an experiment with pearl millet under grazing with different levels of N (0, 250, 300, 450 and 600 kg/ha). The objective was to study the dry matter (DM) production, the utilization efficiency, the recuperation rate, forage density and quality. The experiment was completely randomized design with two replications. Total density and per layer, the distribution and quality of leaf blade, stem and dead material components in distinct pasture layers (0-10, 10-20, 20-30, 30-40 and >40 cm above […]

The effect of isolated trees of baginha (Stryphnodendron guianense (Aubl.) Benth.) on some aspects of cultivated pasture ecosystems was studied in the Western Amazon of Brazil. Soil fertility, nutrients in the litter, soil water content, light transmission to sward, herbage availability, and chemical and morphological composition of the grasses (mixture of Brachiaria decumbens and B. brizantha cv. Marandu) were assessed under the canopies of baginha trees and in the adjacent open areas. The trees had positive effect on soil fertility, […]

Data related to weights of animals of the Tabapuã breed, born from 1959 to 1996, in several areas of Brazil, were analyzed with the objective of evaluating the direct and maternal genetic trends, for body weights adjusted for 205 (W205), 365 (W365) and 550 (W550) days of age. The (co)variance component estimates used in the calculation of the breeding values were obtained by the restricted maximum likelihood method (REML), with a model containing the random additive direct, maternal and permanent […]

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 […]

The objective of this work was to evaluate the dry matter (DM), neutral detergente fiber (NDF) and starch ruminal degradability besides pH, N-NH3 and valatile fatty acids (VFA) in bovines fed diet with corn (CS), cassava meal (CMS), cassava hull (CHS), and sugar cane (SCS). The CMS, CHS and SCS were ensiled with citrus pulp (CPP). Four crossbred, castrated, rumen and duodenum cannulated steers were used in four experimental periods, with 11 days for diet adaptation and 8 days for […]

Thirty six ¾ European ¼ Zebu bulls were fed diets containing 9, 15 and 21% of the dry matter as sugar cane bagasse in natura (BIN). The animals, with initial body weight of 257 kg, were slaughtered with 435 kg, after 138 days on feed. Measurements in the carcass and the 9-10-11th rib cut physical composition were taken. Samples of Longissimus dorsi and Supraspinatus muscles, aged 0, 7 and 14 days, were analyzed for texture and color. Renal, pelvic and […]

Forty Nellore bulls, with 240 kg initial live weight (LW), were used. Four were reference bulls, four were fed for maintenance, and the remaining were allotted to eight treatments, with four different concentrate levels in the diets (20, 40, 60 and 80%) and two levels of crude protein (CP) (15 and 18%). The growing phase was evaluated up to 360 kg of LW and the fattening phase, up to 450 kg of LW. The roughage used was Tyfton bermudagrass hay […]