Studies of induced spawning of piabanha, Brycon insignis, were developed from January to February/96 and February/97, with 3 to 5 years old individuals maintained in captivity. The selected females presented swollen abdomen and red genital papilla, 60% of oocytes with eccentric germinal vesicle. Thirty-three females were induced to spawning through a single dose of 5 IU/g of hCG (human Chorionic Gonadotropin); 17 females received two application: 0.5 and 5 mg/kg of crude carp pituitary extract in an interval of 10 […]

Performance, carcass characteristics and coefficients of apparent digestibility of Nile tilapia fingerlings (Oreochromis niloticus) fed diets with increasing levels of poultry by-product meal (PM) were evaluated. Three hundred fingerlings with average initial weight of 0.35±0.01 g were placed in thirty 120 L net ponds in five cement 1000 L tanks. Six levels of PM inclusion (0.00, 4.00, 8.00, 12.00, 16.00 and 20.00%) were used in the diets, in an experimental randomized blocks desing with six treatments and three replicates. An […]

The aim of the work was to determine the digestible protein requirement (PD) for Nile tilapia in the sexual reversion phase, where 1250 larvae were assigned to 25 aquariums (60 L), with five treatments and five replicates in a completly randomized design. The larvae were fed ad libitum, five times a day, with isoenergy, isocalcium, isophophorus rations, with 30, 34, 38, 42 and 46% of PD, and 30 mg/kg of a-metil hormone testosterone. The animals of each experimental unit were […]

The objective of this work was the development of larviculture handling technics to rear trairao in slightly saline freshwater, with Artemia nauplii as live food. At the beginning of exogenous feeding, eight days after hatching, trairao larvae were counted and stocked in twelve 1.5-L vessels, equipped with aeration, at 10 larvae/L density. The vessels were distributed in three 130-L tanks filled with controlled temperature water (29.5ºC). The tanks were covered with black plastic to keep the environment dark, and uncovered […]

Aiming to determinate the dietary crude protein (CP) requirements for Helix aspersa maxima snail, 200 animals, with average initial weight of 2.00 g were used, and assigned to a completely randomized design with four treatments [12.00, 15.00, 18.00, and 21.00% CP] and five replicates of 10 animals per experimental unit, during a period of 90 days. It was observed a quadratic effect of CP levels on final mean weight, feed conversion, protein efficiency rate, shell percentage and carcass yield with […]

This study aimed to evaluate the ammoniation effect on the crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), hemicellulose (HEM), cellulose (CEL) and lignin (LIG) levels and the in vitro organic matter digestibility (IVOMD) coefficient of urea-ammonia treated (4%; dry matter basis) Annonigrass 2 (Eragrostis plana Nees) hay, at five cutting ages (30, 60, 90, 120, 150 days). A randomized complete block design was used, with four replicates in a factorial arrangement (2×5), with two factors: hay […]

Mixed pastures of Brachiaria decumbens with Stylosanthes guianensis cv. Mineirão and B. brizantha cv. Marandu with S. guianensis cv. Mineirão, under three stocking rates (0.8, 1.2 and 1.6 AU/ha) were evaluated in regard to the animal daily gain and liveweight gain per ha, in the Brazilian Savanna, in order to suggest the most adequate management. A randomized block in a split-plot design with two replicates was used. The plots treatments were constituted of a 2×3 factorial, two grasses (Brachiaria decumbens […]

The experiment was carried out at the experimental station of EMBRAPA/National Dairy Research, at Coronel Pacheco, in the Zona da Mata region of Minas Gerais, to evaluate the qualitative aspects of the nutrients recycling through the feces of grazing bovines. A 110 square meter plot was located in a previous established pasture of Brachiaria decumbens. There were significant differences on the nitrogen and magnesium concentrations of forage, for 10 weeks, apparently reflecting amounts in the forage. There were no variation […]

The research was conducted to evaluate two sources of ammonia (anhydrous ammonia-NH3 or urea) to preserve alfalfa (Medicago sativa L.) hay stored with high moisture. The following treatments were studied: A – Control: untreated hay (12 to 15% moisture); B – hay (24 to 27% moisture) treated with NH3 (1.0% of DM); C – hay (24 to 27% moisture) treated with urea (0.9% DM); D – hay (24 to 27% moisture) treated with urea (1.8% DM); E – hay (34 […]

It was conducted an experiment with pearl millet under grazing with different levels of N (0, 250, 300, 450 and 600 kg/ha). The objective was to study the dry matter (DM) production, the utilization efficiency, the recuperation rate, forage density and quality. The experiment was completely randomized design with two replications. Total density and per layer, the distribution and quality of leaf blade, stem and dead material components in distinct pasture layers (0-10, 10-20, 20-30, 30-40 and >40 cm above […]