This work aimed to study the effects of L-glutamic acid (L-Glu) and K vitamin on the biochemical composition (collagenous proteins, CP; non collagenous proteins, NCP; and total proteins, TP) in femurs of broilers. The experiment which lasted for 14 days, was carried out in a completely randomized design in a 2 × 4 factorial with two levels of L-glutamic acid (6.25% and 12.5%) combined with four levels of K vitamin (0.02; 0.2; 2.0 and 20.0 mg of feed) each combination […]

The objective of the experiment was to determine the biochemical, morphometrics and biomechanical aspects of femur bones of broilers. It was used six hundred male and female broilers at one day of age from three different lines (Hb1 and Hb2 – UFV and Hb3 – commercial). They were fed ad libitum on starter (1 to 21 days), grower (22 to 35 days) and finisher (36 to 42 days) rations. The experimental design was completely randomized, in a factorial arrangement 3 […]

The objective of this study was to develop and to evaluate a dynamic simulation model, with stochastic components in order to assess milk production systems. The simulation model was developed by using STELLA 9.0, ZooCalc 1.0 and electronic data sheets. The physical structure of the herd was divided into 15 interlinked modules that represented categories or subdivisions of categories. Mathematical models obtained from the literature were used to simulate the body weight of growing and lactating animals and milk production […]

It was evaluated in this work the sensorial characteristics of the meat of non-castrate or castrated males feedlot finished and slaughtered at 16 (young steers) or 26 (steers) months old. The diet with 50 roughage: 50concentrate contained 11.8% of crude protein and 2.83 Mcal of digestible energy/kg of dry matter. The highest amplitude of the final pH of the meat was noted on the steers, and the lowest on the young steers. The meat of the non-castrate males, regardless to […]

The objective of this study was to evaluate the use of fat sources in rations for lactating cows on the productive performance and composition of milk protein fraction. Twelve Holstein cows were used, grouped in three balanced 4 × 4 Latin squares, fed with the following rations: control; refined soybean oil; whole raw soybean; and calcium salts of unsaturated fatty acid (Megalac-E). Dry matter and nutrient intake, and daily milk production were evaluated. The samples used to analyze milk composition […]

Two experiments were carried out with the objective of evaluating the effects of the frequency of supplementation with two proteins sources on productive and economical performance (experiment 1) and the nutrients digestibility of steers in supplemented pasture during the dry season over a year. It was used twenty weaned zebu calves at the age of 10 months and initial live weight (LW) of 208.43 kg, distributed in four paddocks of Brachiaria brizantha cv. Marandu, each one with 1.6 ha. Both […]

It was evaluated the performance of female lambs on cultivated pastures of Italian ryegrass (Lolium multiflorum Lam.) and pearl millet (Pennisetum americanum (L.) Leeke) as exclusive food or as daily supplementation with commercial feed at the ratio of 0.5, 1.0 and 1.5% of the body weight. The used grazing method was continuous with variable stocking. Female lambs on Italian ryegrass pasture supplemented with 0.5 and 1.5% of body weight presented greater average daily gain. Regardless to the level, supplementation on […]

The objective of this study was to develop an economically optimal plan for pasture production and supplementary feeding of horses. The plan was based on the optimization of a multiperiodic linear programming model with the objective of minimizing overall feeding costs, subject to the nutritional constraints of each horse category. The model encompasses a period of one year, from January to December, divided in bimonthly periods. Technical coefficients varied among periods based on local information regarding productivity of the forage […]

An experiment under greenhouse conditions was carried out with Tanzania guineagrass supplied with combined rates of nitrogen and calcium in nutrient solutions during the spring season. A randomized block design was used, with four replicates, in an incomplete 52 factorial scheme with five nitrogen rates (2; 9; 16; 23 e 30 mmol L-1) and five calcium rates (0.50; 1.75; 3.00; 4.25 e 5.50 mmol L-1) resulting in 13 nitrogen:calcium combinations (mmol L-1): 2:0.50; 2:3.00; 2:5.50; 9:1.75; 9:4.25; 16:0.50; 16:3.00; 16:5.50; […]

It was evaluated spatial and temporal variability of status descriptive characters of Brachiaria decumbens (signalgrass) cv. Basilisk deferred pastures. Treatments consisted of combinations of pasture deferring periods (73, 103, 131 and 163 days) with grazing periods (29, 57 and 85 days). Randomized block design with two repetitions and subdivided plots was used. It was determined the dispersion of pasture height (PH), stretched plant height (SPH) and falling index (FI) values. Pasture height spatial variability increased linearly with the deferring period, […]