The objective of this trial was to evaluate the effects of replacing corn grain with dehydrated citrus pulp pellets on body weight gains, deposition rates of nutrients and body chemical composition of Santa Gertrudis young bulls. Twenty-eight animals averaging nine months of age and initial body weight of 277 kg were kept in individual pens during 92 days after 21 days of adaptation. Animals were fed a diet containing 20% (DM basis) of 40%-grain corn silage. The following dietary levels […]

This trial was conducted to study the use of mannanoligosaccharide (standard and concentrate) on chicks diets. One thousand and eigthy 1-d male chicks (Ross) averaging 42 g of initial BW were assigned to a completely randomized experiment with nine replications of 20 birds per experimental unit. The following treatments were analyzed: control, antibiotic (avilamicine), mannaoligosaccharide high concentration (MOS AT), mannaoligosaccharide standard (MOS ST), MOS AT + antibiotic, and MOS ST + antibiotic. The birds were reared in wood powder, reused […]

Twenty-seven week-old commercial laying hens were allotted to a completely randomized design with a 3×3 factorial arrangement with three replicates of six birds per treatment. The factors consisted of hree methods for estimatingamino acid ingredient composition (Brazilian tables, prediction equations and factor for correcting amino acid in function of ingredient protein level) and three amino acid recommendations, being two for digestible amino acids and one for total amino acid. Methods for estimation amino acid ingredients composition had effect only on […]

Data envelopment analysis (DEA) was used to analyze the efficiency of a beef production system in which technologies were adopted during eight years (1995 to 2002). Ten inputs and one output were used to evaluate the production system efficiency applying principal component analysis. The inputs “mineral salt/vaccine/medication”, “workforce and social security” and “investment” were significantly correlated with the first three components that explained 91.6% of the total variance. The efficiencies calculated by DEA for 1995, 1996, 1997, 1998, 1999, 2000, […]

The aim of this study was to check on the effect of additive addition on the variations in the water soluble carbohydrate contents of the tanzaniagrass silage during the fermentation period, and to know the buffering capacity values and water soluble carbohydrate: buffering capacity ratio of this forage. Tanzaniagrass (Panicum maximum Jacq. cv. Tanzânia I) was established in a Clavey Red Dusk Latosol and harvested at 60-65 day of age. The forage was ensiled in experimental PVC silos, fitted with […]

ABSTRACT This study aimed to evaluate the reproductive performance of Chianina cows born from 1977 to 2002. Data was used to calculate age at first calving (AFC), first calving interval (CI1) and average calving intervals (avgCIs) for the whole lifetime of cows. After editing data, the number of records used for AFC, CI1 and avgCIs analyses were respectively 31,023; 23,998 and 94,497 respectively. Statistical analyses were done using the SAS program (Statistical Analysis System) and variance components were estimated by […]

The objective of this trial was to estimate the efficiency of utilization of metabolizable energy (MEEU) for maintenance (Km) and weight gain (kg) of feedlot purebred and crossbred Nellore. Seventy-two young bulls averaging 10 to 11 months of age from four genetic groups: Nellore, F1 Nellore x Angus, F1 Nellore x Brown Swiss and F1 Nellore x Simental and initial average body weights of 286, 309, 333 and 310 kg, respectively, were used in this study. A completely randomized design […]

A trial was conducted to evaluate the effect of reduced CP, amino acid-supplemented diets on performance of castrated males swines on high environmental temperature (32ºC). A total of sixty crossbred piglets (Landrace x Large White) averaging initial weight of 15.2 kg was allotted to completely randomized experimental design with five treatments (18, 17, 16, 15, and 14% of CP), six replications and two animals per experimental unit. The experimental diets were fed to swine ad libitum until the end of […]

The effects of feeding nine nutrition plans (NP) on the performance of 576 quails, allotted to a completely randomized design with nine treatments of four replicates of 16 birds, were evaluated in this trial. The following NP were analyzed from 1 to 21 days of age: NP1 = 28% of crude protein (CP), 1.5% lysine (L) and 1.1% methionine + cystine (MC) from 1 to 21 days and 24%CP, 1.3%L and 0.9% MC from 22 to 42 days (control); NP2 […]

This trial was carried out to determine the effect of continuous, alternated or rotational grazing systems on the performance of pigs (feed intake, weight gain, feed conversion and backfat thickness), in the growing and finishing phases, as well as the forage availability and chemical composition of a white clover pasture (Trifolium repens L.). Thirty-six castrated pigs were allotted to a randomized complete-block experimental design with three treatments and three replications. Twelve feedlot pigs were kept on a rearing system. No […]