The aim of this work was to determine the centesimal composition and fatty acids profile of freshwater prawn (Macrobrachium amazonicum) for determination of its nutrient potential. Six lots (each one with 100 g) containing whole prawns with individual mass ranging from 0.9 to 1.2 g were triturated and stored for posterior chemical analysis. The average values for moisture, ash, CP and total lipids were as follows: 70.3, 1.5, 24.8, and 1.5%, respectively. It was detected 36 varieties of fatty acids, […]

The apparent digestibility coefficients of DM, protein and energy of five ingredients (soybean meal, corn gluten meal, fish meal, broken rice and ground corn) were determined for jundia juveniles (78.5 ± 9 g). The indirect method was adopted for nutrient digestibility estimate. Chromium oxide (0.5%) was added to the diet as marker, and feces were collected by sedimentation every four hours. Among all tested ingredients, corn gluten meal showed the highest apparent digestibility coefficients (95.0% of protein, 88.0% of energy […]

Four hundred and thirty-two Nile tilapia (Oreochromis niloticus) fingerlings averaging initial weight of 0.60 ± 0.02 g were allotted to thirty-six 150 L-aquaria to determine total phosphorus requirement. The experiment was analyzed as a completely randomized design, with six treatments (0.55, 0.73, 0.94, 1.14, 1.37, and 1.59% of total phosphorus), six replicates and 12 fishes per experimental unit. The fishes were fed diets with 32% of CP and 3,000 kcal of DE/kg, during 40 days. Quadratic effect was observed for […]

This experiment was carried out from March to August 2000, to study the dry matter yield dynamic and performance of steers grazing Tanzania grass (Panicum maximum Jacq. cv. Tanzânia), under continuous stocking with variable stocking rate, and four forage allowances (3, 7, 11, and 15% BW). Crossbred Nelore x Charolais steers, averaging 18 months and 350 kg BW, were used. A randomized block design, with three replicates, was used. When tanzaniagrass was managed in the 7 to 11% interval of […]

This work aimed to evaluate morphological features of the white clover core collection obtained from the United States Department of Agriculture (USDA), represented by 78 accessions, in order to characterize the existent morphological variability and to estimate the genetic divergence, using nine characters (eight morphological and one agronomic). Seventeen plants from each access were evaluated individually at the Experimental Station of the Universidade Federal do Rio Grande do Sul in Eldorado do Sul and characterized in relation to the following […]

The chewing behavior of crossbred beef steers grazing pure swards of marandugrass (Brachiaria brizantha Stapf Hoesch cv. Marandu), tanzaniagrass (Panicum maximum Jacq. cv. Tanzânia), and forage peanut (Arachis pintoi cv. Amarillo) as well as a mixed sward of marandugrass plus forage peanut all managed to yield different heights was evaluated in this trial. Paddocks of grasses were managed through grazing to obtain six different heights while those of forage peanut and mixed pasture were lowered by using the intermittent grazing […]

The objective of this experiment was to evaluate the effect of corn grain maturity and air exposure time prior to ensiling on the carbohydrate concentration of corn silage from corn crop planted late in the season. A complete randomized design was used with a 2 x 4 factorial arrangement, testing two stages of maturity at harvest (MK – milky kernel and MDK – ½ milky and ½ dough kernel) of maize crops and four air exposure time prior to ensiling: […]

This study aimed to evaluate changes in hormone secretion and in seminiferous epithelium of Angus bulls between 10 and 38 weeks of age. Samples of testicular parenchyma and blood were collected from 25 animals castrated in 4 week intervals. Traits associated to testicular development and quantitative aspects of spermatogenesis and hormonal concentrations were transformed by logarithm before analyses of variance. Changes in testis and seminiferous tubule diameter and testis weight were more pronounced after 26 weeks of age. The percentage […]

Data from 326 animals of a F2 swine population were used to select traits related to meat quality by principal components analysis. The following traits were considered: pH at 45 minutes post mortem (pH45), pH at 24 hours post mortem (pHu), drip loss (DL), cooking loss (CL), total loss (TL), intramuscular fat (IMF), objective tenderness (OT), lightness (L), redness (a) and yellowness (b). Variation lower than 0.7 (eigenvalue lower than 0.7) indicated four traits, which were significantly correlated to the […]

Data consisting of 3,531 test day records of 620 first parity Jersey cows were used to estimate genetic parameters for milk yield. Covariance components were estimated by repeatability and random regression animal models. The Wilmink function was used in the random regression model to fit the fixed effect of season of calving and the additive genetic, permanent environment and residual random effects. The repeatability model included the fixed effects of herd-year-month of test, season of calving and age at calving […]