The effects of feeding increasing dietary organic acids on performance and diahrrea incidencefor piglets from 21 to 49 days old were evaluated. The treatments were constituted of a basal diet and three groups supplemented with 0.78, 0.84 and 0.90% of organic acids in the 21 to 35 days period and 0.59, 0.63 and 0.66% in the 36 to 49 days period, basedoin lactic acid. Average daily feed intake (ADFI), average daily weight gain (ADWG), feed:gain ratio (F/G) and diarrhea scores […]

The objective of this trial was to evaluate the body weight change as well as the diameters and numbers of muscular fibers of the Semitendinosus muscle of lambs from birth until weaning that were born from Santa Inês ewes supplemented at different stages of gestation. Seventy-three Santa Inês ewes averaging 45.11 kg of body weight (BW) that were bred with three Dorset rams were randomly assigned to the following treatments during pregnancy: 1) control (CO): tanzaniagrass pasture (Panicum maximum Jacq.) […]

Sixty-five crossbred sows (Landrace x Large White) averaging 217.36 ± 21.35 kg were used to evaluate increasing dietary total lysine levels (0.950, 1.025, 1.100, 1.175, and 1.250%) during 21 days of lactation. The experiment was analyzed as a randomized block design, with five treatments, 13 replicates of one sow per experimental unit. The daily total feed intake was fixed for all treatments. The dietary lysine levels did not affect sow weight at weaning, body weight loss, backfat thickness (BT), BT […]

This study was conducted using 103 male and female lambs from the following genetic groups: purebred Santa Inês (SS) and crossbreds of Santa Inês x Texel (TS), Santa Inês x Ile de France (FS), and Santa Inês x Bergamacia (BS). Animals were slaughtered at one of the following body weights: 15, 25, 35 or 45 kg. After slaughter and cooling of the carcasses, the following cuts were made: neck, rib/flank, short ribs, loin, blade, and hindlimb. The alometric growth of […]

The objectives of this trial were to evaluate the effect of dietary oil supplementation on milk yield, milk composition and milk fatty acids profile of lactating Saanen goats. Four ruminally cannulated multiparous goats averaging 54±1.02 kg BW and 80 days in milking were used. Goats were fed a control diet or a diet supplemented with one the following oil sources: canola, rice or soybean. The statistical design was a 4 x 4 Latin square and data were analyzed using the […]

Data consisting of 47.668 records of a Nellore-Angus crossbred population, raised in several regions of Brazil, from 1991 to 2001, were used to estimate heritability for post-weaning daily gain (ADG) and for scrotal circumference at yearling age (SCY) using REML. Genetic and phenotypic trends for ADG were also estimated. The model used to estimate heritability and breeding values (BVs) for ADG included the fixed effects of breed composition (defined by the percentage of contribution of the Nellore breed of the […]

The objective of this study was to evaluate the effects of vitamin and micromineral levels adjustment in the test diet on the total collection method for determination of apparent metabolizable energy (EMA) and apparent metabolizable energy corrected by nitrogen retention (EMAn) of soybean meal. Two treatments were compared: the test diet without or with adjustments in the amounts of choline chloride and vitamin-micromineral premix, when 40% of the reference diet was replaced with soybean meal. The traditional total feces collection […]

The objective of this trial was to evaluate partial and total tract digestibilities of diets containing Brachiaria brizantha hay plus concentrate fed to young bulls. Four Santa Gertrudis young bulls fitted with duodenal and ruminal cannulae were used in a 4 x 4 Latin square. Diets were formulated to yield daily body weight gains (BWG) of 0.5 or 1 kg/animal and potential of microbial fermentation of 9.5 or 11 g of microbial crude protein/MJ fermentable metabolizable energy. Apparent digestibility of […]

A performance assay was conducted to study the effects of dietary electrolyte balance (EB) and crude protein levels on deposition of collagenous protein (CP) and the non collagenous protein (NCP) in the broiler bone matrix femurs. The broilers were fed diets with 20.0 or 23.0% of CP combined with 0, 50, 100, 150, 200, 250, 300, or 350 Meq/kg of EB from 1 to 21 and from 22 to 42 days. The experiment was analysed as a completely randomised design […]

This experiment was conducted to determine the dietary threonine requirements for Nile tilapia. The fishes (37.61 ± 1.16 of initial weight) were allotted to a completely randomized design with four treatments, three replicates and 25 fishes per experimental unit. It was used a reference diet with 27% of CP and 3,000 kcal of DE/kg, supplemented with L-threonine, resulting in diets with 0.92, 1.06, 1.21, and 1.35% of total threonine. Synthetic amino acids were added to mantain their profile according to […]