The effect of decreasing dietary crude protein (CP) with supplementation of amino acids, based on the ideal protein concept on Nile tilapia (Oreochromis niloticus) fingerlings performance was evaluated. A total of 396 fingerlings from Thai strain, with 0.80 ± 0.17 g of BW, was allotted to a randomized block design, with six levels of CP (32, 31, 30, 29, 28 and 27% of CP) in the diets, six replications with 11 fish each. The diets were formulated to be isocaloric […]

It was evaluated the shading effect induced by two tree densities of a ten-year-old slash pine (Pinus elliottii Engelm.) forest, and at full sun, on forage dry matter yield and nutritive value of three cool-season annual grasses. Treatments were a combination of two main factors: a) three light conditions induced by two tree densities (333 e 555 stems/ha) and at full sun; b) three cool-season annual forage grasses: Italian ryegrass (Lolium multiflorum Lam.), common oat (Avena sativa L.) cv. Fapa-2, […]

Two trials were conducted to evaluate losses of Marandu grass silages using different additives. The fermentation profile and aerobic stability of the silages were evaluated on the first trial. The followings silages were evaluated: 1 – Marandu grass (Control), 2 – Marandu grass plus L. plantarum and Propionibacterium, 3 – Marandu grass plus L. buchneri, 4 – Marandu grass plus 0.1% of sodium benzoate. On the second experiment, it was utilized nine castrated Nellore steers (Body weight 350 ± 38.9 […]

This study tested the influence of different forage allowances during the growing season on vegetation dynamics and animal performance. Treatments consisted of different herbage allowances (kg DM/100 kg liveweight/day, expressed in %) and different combinations of herbage allowances in sequence: 4.0%, 8.0%, 12.0%, and 16.0% herbage DM allowance during the entire year; 8.0% herbage allowance in Spring and 12.0% in Summer/Autumn; 12.0% herbage allowance in Spring and 8.0% in Summer/Autumn; 16.0% herbage allowance in Spring and 12.0% in Summer/Autumn. The […]

Two experiments were carried out to evaluate structural characteristics and crude protein concentration of Pennisetum purpureum cv. Cameroon and Brachiaria brizantha cv. Marandu under four rotational stocking rates. During the rainfall period, the studied stocking rates for both pastures were 3, 4, 5, and 6 steers/ha and in the dry period the stocking rates were 2, 3, 4, and 5 steers/ha. In both experiments, elephantgrass cv. Cameroon produced greater total herbage mass and green herbage mass, which decreased with the […]

The population dynamics of tillers and tissue turnover were investigated in pastures of Pennisetum purpureum Schum. cv. Cameroon submitted to different stocking rates under rotational stocking. Two experiments were carried out and the experimental area was characterized by a mean annual rainfall of 1,311 mm and average temperature of 25ºC. In the rainfall period the stocking rates were 3, 4, 5, and 6 steers/ha; in the dry period the stocking rates were 2, 3, 4, and 5 steers/ha. The most […]

This work aimed to evaluate the forage value of a brown-seed grass (Paspalum plicatulum) population, considering bromatological aspects and dry matter accumulation. Plants were obtained from tussocks and they were established in a weed-free area 80 cm apart from each other. The experimental design was completely randomized and treatments consisted of plant age after establishment characterized by days (D) and degree-days (DD) accumulated above 0ºC. Harvests were performed at ground level in late-spring (27 D, 587 DD), mid-summer (68 D, […]

The additive and non-additive effects on pre-weaning and post-weaning traits in Hereford x Nelore animals were estimated by multivariate linear regression analyses, including or not the ridge regression procedure. Variance inflation factors (VIF) estimates for all covariates were larger in the analysis without ridge regression. The estimates obtained in this study were used to predict the performances of successive generations of a ½ crossbred Braford population resulting from mating Hereford bulls to Nelore cows. High performance was observed in the […]

Records from 2.440 first lactations of Gir cows, calving between 1990 and 2005, were used for estimating genetic parameters of test-day milk yield (TDMY) and accumulated 305 day milk yield (M305) in univariate and bivariate animal models analyses. The model for TDMY included the contemporary group (CG) defined by the combination of herd, year and season of test day, the class of age of cow at calving and the linear covariate of days in milk (linear regression) as fixed effects […]

The objectives of this study were to map Quantitative Trait Loci (QTL) in chromosomes 16, 17 and 18 and to associate their effects with performance traits in a F2 pig population developed by mating two Brazilian Piau sires with 18 crossbred dams (Landrace x Large White x Pietrain). The linkage map for this population was constructed after genotyping the animals for 11 microsatellite markers and scoring the genotype. Estimates of polymorphic information content (PIC) indicated that the microsatellite markers were […]