Thirty-three 39 crossbreed Holstein-Gyr steers were used in a research aiming to evaluate the effects of feed restriction prior to the confinement on the changes in body composition and in the net requirements of energy for maintenance and weight gain, and protein for weight gain. Thirty animals were submitted to a high grazing pressure, while the remaining nine steers had unrestricted access to forage (continuous gain group), after what, six animals from the first group and three from the second […]

ABSTRACT – The research was carried out to determine body composition and calcium and phosphorus requirements of Santa Ines lambs. Eighteen entire male lambs with average initial live weight of 15 kg were used. The animals were allotted to three groups: six animals were slaughtered at the beginning of the experiment, to access the amount of calcium and phosphorus present in the body, as reference animals for the comparative slaughter technique. Six animals were ad libitum fed and six were […]

This work was carried out to estimate the retention and the net requirements of Ca and P, in 120 goats averaging 42 kg LW. The estimate retention based in the difference between the total of each mineral stored in the fetus, the uterus, the membranes, the fetal fluids and the mammary gland of animals in the different phases of pregnancy and the total of each mineral stored in the empty goats. The model of prediction used was lnY = A […]

This work was conducted to evaluate the chemical body composition of sixty three young bulls, from the Gyr, Guzera, Mocho Tabapuã, Nellore breeds, in feedlot, averaging, respectively, 376.4, 357.6, 362.0, and 368.6 kg of initial live weight. The animals from each breed were divided into five categories: initial slaughter, full fed diet containing 50% concentrate until the individual slaughter weights of 405, 450 and 500 kg, respectively, and finally the category restricted feeding fed the same diet supplying levels of […]

The effects of five dietary concentrate levels on the body composition and on the net requirements of protein and energy for weight gain were evaluated. Twenty nine F1 Simental Nellore bulls, averaging 17 months of age and initial 354 kg LW, were used. Five animals were slaughtered at the beginning of the experiment, as a reference, to estimate the initial empty body weight (EBW) and the initial concentrations of fat, protein and energy. The remaining animals were allotted to a […]

The objective of this work was to evaluate the effects of different forage levels in the diet on the body composition, net energy for maintenance and weight gain and net protein requirements for weight gain. Fifty-two pure Holstein bulls calves; 60 days old with initial average live weight (LW) of 78 kg were used. Eight reference animals were slaughtered at the beginning of the feeding trial. Another group of eight animals were fed diet with 90% of forage and 10% […]