The experiment was carried out aiming at evaluate the effect of using ractopamine and phytase in diets for swines at the end of the finishing period on performance, carcass characteristics and mineral composition on the third metacarpus bone. It was used 240 barrows with initial weight 100.7 ± 3.9 kg in a random block design, in a 2 × 3 factorial arrangement, with two levels of ractopamine (5 ppm and 10 ppm) and three levels of phytase (0, 500, and […]

The objective of this work was to compare the levels of fatty acids between conventional commercial eggs and designer omega-3 eggs. It was used 864 Isa Brown line laying hens randomly distributed in two groups, so each cage with four birds was considered a replicate, totalizing 216 repetitions. In the group for production of conventional eggs, birds were fed corn- and soybean-based rations during the entire productive life while in the group for production of designer eggs, they were fed, […]

It was used 17,767 weight records of 4,210 Santa Inês breed lambs aiming to compare random regression models with different structures to model the residual variance in genetic studies of the growth curve. The fixed effects included in the analysis were contemporary group and age of the ewe at lambing. Fixed and random regressions were fitted through Legendry polynomials of orders 4 and 3, respectively. The residual variance was fitted by heterogeneous classes and by functions of variances employing ordinary […]

This work aimed to estimate genetic parameters for age at first calving, scrotal circumference, and seminal traits, and to evaluate genetic trend for age at first calving for dairy Gyr breed animals by analyzing data of 7,055 females and 97 males from several Brazilian herds. Covariance components were estimated by using the restricted maximum likelihood method under animal model in univariate analyses. The model for seminal traits included the company-year-season of semen collection fixed effects, age at the collection as […]

It was evaluated in this work the components of (co)variance and heritability of the parameters of egg production curve in quails in a model of double stages: the first stage is composed of the adjustment of a nonlinear curve, and the second is composed of the assessing of the genetic parameters obtained by the animal model. It was used daily individual records from laying to 90 days, starting with the first egg in the batch, of 308, 374 and 378 […]

This study aimed to verify if the selection is influenced by partial observation of laying instead of observation of total daily posture. On the first state of analyses, through a Bayesian model, it was considered as analyzed characteristics the parameters of laying probability curve in a model of random effects with function of logistic connection. On the second stage of the procedure, it was obtained the estimatives of (co)variance components and genetic parameters. It was observed an overestimation of the […]

It was used 10,238 weekly milk production records on the control day from the first 388 lactations of Saanen goats on the evalution of six lactation persistency measures in order to find out which was the best fitted for using in genetic evaluations on this trait. These six evaluated measures are adaptations from those used on dairy cattle, obtained by replacing, in the formula, bovine reference values by the goat ones. The values used in the calculations were obtained from […]

This study aimed at verifying whether juvenile plants of alfalfa cultivars with different aptitude (grazingtype: Alfagraze and ABT 805; hay-type: Crioula) show morphophysiological differences in order to develop a protocol for early selection for grazing persistence. Two experiments were conducted in a greenhouse, in completely randomized design and three repeplicates. In Experiment 1, plants were evaluated from successive destructive harvests at 60, 90, 120 and 150 days of age. In Experiment 2, plants at 150 days of age were cut […]

This trial aimed at determining the dehydration curve at nine times (0, 3, 6, 9, 24, 27, 30, 33 and 46 hours after cuting of the plants); the leaf/stem ratio and number of leaves per stem in alfalfa submitted to four managements during the drying process. It was also evaluated the bromatologic composition and in vitro digestibility of the dry matter and cell wall of alfalfa hay before storage. The drying methods applied for alfalfa were the following: drying in […]

The objective of this work was to study morphogenic characteristics, and dry matter production of roots and shoots of marandu palisadegrass (Brachiaria brizantha cv. Marandu) submitted to combinations of nitrogen and potassium, in a nutritive solution, employing silica as substrate. The experiment was carried out in a greenhouse during the summer. It was used a 52 fractionated factorial scheme with 13 combinations of nitrogen and potassium, which were distributed in a randomized block design, with four replications. The nitrogen × […]