This trial was carried out to determine the composition of n-alkanes (C24 to C36) in hypothetical diets comprising of pure Brachiaria brizantha Stapf. cv. Marandu and Arachis pintoi Koprov & Gregory. cv. Amarillo and mixtures of these two spececies with 15%, 30%, 45%, or 60% of Arachis pintoi); it also intended to identify the combination of alkanes that allows to calculate the botanical composition of diets with the smallest residual value (real less estimated values). The forages were sampled in […]

Data comprising 8,183 test day records of 1,273 first lactations of Gyr cows from herds supervised by ABCZ were used to estimate variance components and genetic parameters for milk yield using repeatability and random regression animal models by REML. Genetic modelling of logarithmic (FAS), exponential (FW) curves was compared to orthogonal Legendre polynomials (LP) of order 3 to 5. Residual variance was assumed to be constant in all (ME=1) or some periods of lactation (ME=4). Lactation milk yield in 305-d […]

The objective of this trial was to evaluate the components of non integrate body components of carcass of two categories, steers (slaughtered at 22.8 months old) and young steers (slaughtered at 15.2 months old), from two genetic groups, 5/8 Charolais (CH) 3/8 Nellore (NE) and 5/8NE 3/8CH, and to evaluate the relationship among the variables studied. The animals were fedlot finished until reaching 430 kg. The diet, roughage:concentrate ratio of 60:40 (dry matter basis), contained 10.25% crude protein and 3.18 […]

Leaf assimilates are exported to plant organs (sinks) in variable pattern according to several factors such as: plant developmental stage, leaf insertion level, intensity of defoliation. The distribution of single leaf assimilates to different fractions of Mombaçagrass plant was assessed as a function of several factors. The factors considered were: 1 Leaf insertion level (top and bottom leaves); 2 Tiller hierarchy (main and primary tillers), and 3 Plant defoliation (control and defoliated plants). Defoliated plants had their blades removed at […]

The objective of this trial was to evaluate the effects of different levels of supplementation on dry matter intake and of ruminal pH and ammonia content of growing steers grazing Brachiaria brizantha, during the dry to rainy transition season, from April to June 2003. Five ruminally fistulated steers averaging 15 months old and initial weight of 271 kg were assigned to a 5×5 Latin square design. The treatments were as follows: control (mineral salt) and supplements fed at different levels […]

The effects of diet adaptation protocol by steers and of feeding four dietary urea levels (0, 0.65, 1.3, and 1.95%, dry matter – DM basis) on intake and total apparent digestibility of DM, organic matter (OM), crude protein (CP), ether extract (EE), total carbohydrates (CHO), neutral detergent fiber (NDF), nonfiber carbohydrates (NFC) and total digestible nutrients intake (TDN) for Holstein, ½ Holstein-Guzera, ½ Holstein-Gir and Zebu steers were evaluated in this trial. The animals were assigned to four 4×4 latin […]

The objective of this trial was to evaluate the carcass quantitative characteristics of two categories: steers and young steers, from two genetic groups, 5/8Charolais (CH) 3/8Nelore (NE) and 5/8NE 3/8CH, and to evaluate the relation among studied variables. The animals were fedlot finished until reaching 430 kg of body weight. Steers were slaughtered averaging 22.8 months old and young steers 15.2 months old. The diet, roughage:concentrate ratio of 60:40 (dry matter basis), contained 10.25% crude protein and 3.18 Mcal of […]

Two trials were conducted to evaluate the effects of increasing dietary digestible lysine levels, maintaining or not the amino acid relation, on performance of broilers from 22 to 42 days old on thermoneutral environment. Two hundred and ten male broilers (averaging initial weight of 662.5 g) and 168 broilers (averaging initial weight of 623.7 g) were assigned to a completely randomized experimental design in trials 1 and 2, respectively. In trial 1, the broilers were allotted to five treatments (digestible […]

The objective of this trial was to evaluate the effects of different levels of supplementation on performance of grazing steers in the growing phase. The experiment was carried from March to November 2003. Fifty-five steers averaging 10 months old and initial body weight of 226 kg were assigned to a completely randomized design. The treatments were as follows: control (mineral salt) and supplements fed at different levels (0.125, 0.25, 0.50, and 1.0% body weight/animal/day) and contained corn and soybean meal […]

This is study aimed to compare growth performance, meat quality, and carcass yield of three broiler chicken strains: Cobb, Paraiso Pedrês and ISA Label. The experiment was analyzed according to a randomized design, with five replicates of 29 birds per treatment. Weight gain, feed intake, and feed conversion were evaluated weekly. Adjustments performed according to Gompertz model to describe the birds growth were based on mean weight gain. The birds growth rate was obtained by the Gompertz derivative model. When […]