Sugarcane bagasse with 55% of dry matter (DM) was treated with five levels of urea (0, 2.5, 5, 7.5, and 10%) and 5% ground whole soybean as a source of urease both, on a DM basis. The material was stored in plastic bags for 97 days (8 kg/ 50 L plastic bag), and after plastic bag opening, samples were collected at three aeration period (2, 9, and 16 days). A completely randomized design with three replicates was used. There was […]

This trial was carried out, from October 1993 until June 1995, to evaluate the chemical composition and dry matter digestibility of dwarf elephantgrass at plant heights of 80 and 120 cm under five nitrogen rates. The experimental design was completely randomized with a split split plot arrangement, with four replicates, where the clipping factors, and nitrogen doses (0, 25, 50, 100kg/ha•clipping, in the first year, and 0, 75 and 100 kg ha•clipping, in the second year, and plant heights (80 and […]

The objective of this work was to verify the effect of ammoniation on the contents of crude protein (CP), nitrogen retention (NR), dry matter (DM) content, preservation, cell wall constituents and in vitro dry matter disappearance (IVDMD) of cracked corn with high moisture (25%). Four levels of anhydrous ammonia (0, 1, 2 and 3%) and five aeration periods (0, 7, 14 21, and 28 days) were studied using a completely randomized design, in a split plot design. The contents of […]

The objectives of this work were to estimate the dry matter intake by animals grazing three cultivars of Panicum maximum, and to relate it to live weight gain, grazing time (GT) and some structural and chemical characteristics of the pastures. The experimental design was the randomized block with three treatments and three replicates. The dry matter voluntary intake (DMVI) was estimated in four periods (May, September, November and February). Fecal output was measured using chromic oxide as an external marker. […]

This experiment was conducted to evaluate the effect of cottonseed meal and cotton seed flour on the reproductive behavior and on the testis activity of Nile tilapia broodstock. Twenty-five fishes were fed diets containing 0, 2, 4 and 6% ground cottonseed flour and 24% cottonseed meal (CSM). The reproductive behavior of the fishes was daily observed and the nest construction, courtship and spawning were evaluated. At 90 days, the males gonads were microscopically evaluated. The control group (soybean meal) showed […]

The objective of this work was to compare the alternative methods to estimate the milk yield of cows from Gyr breed. A total of 3,632 lactations from of Gyr breed cows, from 1986 to 1996, were analyzed. The methods were: A – the morning milking control was performed in the odd months and the afternoon milking control in the even months – the yield of the morning milking control was multiplied by the multiplicative factor of the morning (MF) and […]

The present study was carried out to estimate the average lactation curve of 7239 lactations of Caracu cows based on 299,949 weekly records. The functions fitted to the mean data of the lactation curve were: Linear Hyperbolic and Logarithmic Quadratic as linear and Incomplete Gamma and Inverse Polynomial function as non-linear. The parameters were estimated by iterative methods, Gauss-Newton method. The adjusted Coefficient of Determination (R²A), the Durbin-Watson test (DW) and the deviations (%) from actual and predicted total milk […]

To estimate the magnitude of sire of fetus (SOF) effects on productive and reproductive traits in females of Pitangueiras breed, 2287 lactations of 618 cows, daughters of 82 bulls, mated with 68 sires were analyzed. The statistical analyses were made using LSMLMW program (Mixed Model Least Squares and Maximum Likelihood Computer Program). Sire of fetus (SOF) did not affect the milk production in the subsequent lactation, however its effect was significant for the percent fat and production, days open, gestation […]

The objective of this work was to evaluate the effects of year of calving (YC), season of calving (SC), genetic group (GG), calf sex (SEX), reason for drying-off (RD), cow age at calving (AGE, in months), lactation length (LL, in days) and sire (SIRE) on milk yield (MY) in a Holstein breed herd. A total of 684 observations, from 267 cows raised in a physical models of dairy cattle production system maintained at Embrapa – Centro de Pesquisa de Pecuária […]

The objective of this work was to study birth (BW) and weaning (WW) weights, and birth weight/cow weight at calving (BWR) and weaning weight/cow weight at calving (WWR) ratios of 1/2 Canchim + 1/2 Nellore and 1/2 Charolais + 1/4 Canchim + 1/4 Nellore calves out of straightbred Nellore and crossbred 1/2 Canchim + 1/2 Nellore cows, and sired by Canchim (5/8 Charolais + 3/8 Zebu) and Charolais bulls, respectively. Analyses of variance were carried out separately for each genetic […]