With the objective to estimate genetic and phenotypic parameters of swine reproductive traits, litter weight at birth (PLN), litter weight at 21 days (PL21), litter size at birth (TLN), litter size at weaning (TLD) and mortality rate (TM) data of three swine breeds, Duroc, Landrace and Large White were used. The genetic and phenotypic (co)variances were estimated by Restricted Maximum Likelihood (REML) method. These components were used to estimate the direct (), maternal () and total () heritabilities, the common […]

The effects of nitrogen and potassium fertilization on elephantgrass – Napier cv. were evaluated. An incomplete N x K factorial arrangement was studied in randomized block design with three replications with seven N levels (20, 50, 100, 200, 300, 350 and 380 kg/ha) and seven K levels (16, 40, 80, 160, 240, 280 and 304 kg/ha). The fourteen N and K combinations were obtained according to the Box Berard Matrix, increased 3, with an extra point. The elephantgrass – Napier […]

A trial was conducted to evaluate the influence of antinutritional factors in some feedstuffs on broiler chick’s performance and intestinal epithelium. A total of 480 one-day old broiler chicks were allotted to a completely randomized experimental design with four treatments (A= corn and soybean meal based control diet; B = diet containing Leucaena leucocephala – 6% [LL]; C = diet containing Leucaena cunningan – 6% [LC] and D = diet containing Pigeous bean – Cajanus cajan – 20% [CC]), four […]

The effect of slaughter age on non-carcass components and carcass characteristics was evaluated in 35 Suffolk lambs slaughtered at average age of 90, 130 or 170 days, fed corn silage and concentrate (19.6% CP). As the slaughter age increased, animal live weight and carcass weight linearly increased, and some non-carcass components as blood, head, legs and full viscera percentage linearly decreased, leading to a linear increase in carcass yield. As the slaughter age increase, it was observed change in the […]

The objective of the present study was the fractionation and the degradation kinetics of the nitrogenous compounds and of the carbohydrates of the sugar cane, poultry litter and cottonseed meal. The non-protein nitrogenous compounds, soluble and insoluble nitrogen in borate-phosphate buffer, neutral detergent and in acid detergent insoluble protein nitrogen were analyzed for the determination of the nitrogen fractions. The degradation rates of the protein fractions were obtained by the In vitro incubation of the feeds with proteases isolated from […]

Six Alpine goats with an average milk yield of 2.5 kg/day were randomly assigned to two groups of three and allotted to thermoneutral or heat stress conditions, for 56 days in climate chamber room. A crossover experimental design was used. The goats under heat stress were exposed to a diurnal average air temperature plus simulated solar radiation of 33. 84oC. The heat-stressed goats showed elevated respiratory frequency, respiratory minute volume, respiratory evaporation, rectal temperature and sweating rate, while the tidal […]

This research had as objective the evaluation of the acidity effect (pH) by adding increasing levels of corn starch on the degradation of hydrolyzed casein (Tripticase). The rumen fluid was taken from a fistulated steer in a 40% concentrate diet, and centrifuged at 500xg in 15 minutes to remove feed particles and protozoa. The incubations were done in an anaerobic environment at 39ºC in Vacuntainer® tubes. It was used 150 mg of tripticase and 0, 25, 50, 75, 100, 200 […]

Data of scrotal circumference and female reproductive traits were analyzed to estimate heritabilities and genetic correlations. Data were obtained from 11 farms by the same company, located in the States of São Paulo, Mato Grosso do Sul and Goiás. Variance components were estimated by restricted maximum likelihood using two-trait animal models. For traits with repeated measures, two mathematical models were used: including or not the permanent environment of the cow. Analyses that not included the permanent environment of the cow […]

With the objective to evaluate the performance of broiler chickens subjected to feed restriction (fr), an experiment was conducted in a completely randomized design with factorial arrangement (6 x 2), with six feeding programs, two sexes, four replicates and 15 birds per experimental unit. The used feeding programs were: Res-0 (ad libitum), Res-1 (day 7), Res-2 (days 7 and 14), Res-3 (days 7, 14 and 21), Res-4 (days 7, 14, 21 and 28) and Res-5 (days 7, 14, 21, 28 […]

Thirty rabbits from New Zealand White breed , 15 males and 15 females, with 50 days of age, were used on assay of digestibility, with the aim to determine the nutritional value of recovery yeast (Saccharomyces sp), dried in a rotational cylinder (RYRC) and by spray-dry (RYSD). The rabbits were assigned to a completely randomized experimental design with three treatments and ten replicates, with one as a reference diet and two test diets. In the elaboration of test diets, the […]