The decomposition dynamics and mineralization of nitrogen of fourteen residues of grasses and legumes forages varying in origin and collecting places were evaluated. Seven species were selected (B. humidicola, B. brizantha, A.pintoi, D.ovalifolium, L.leucocephala, S. guianensis and C. pubescens), based on qualitative characteristics and using the distance medium Euclidian as dissimilarities measure and then placed in erlenmeyers vases in the laboratory in an entirely randomized fashion. Decomposition data were analyzed using a split-splot design with residues in the main plot […]

This study analyzed the influence of the fish farming system (intensive, in igarapé channel, or semi-intensive, in ponds) on the body composition of tambaqui, Colossoma macropomum, and matrinxã, Brycon cephalus, juveniles. Tambaqui (15.4 cm and 88.3 g average length and weight, respectively) and matrinxã (23.4 cm and 219.4 g average length and weight, respectively) were stocked at a density of 10 and 1 fish/m2 in the intensive and semi-intensive culture system, respectively. Fish were fed to satiation, twice a day, […]

The objective of this experiment was to evaluate the effects of different dietetic physical profile on the performance of lactating dairy cows. Ten Holstein dairy cows (avg. 550 kg) were allotted to a switch back experimental design in three successive periods. The animals were individually housed in a tie stall and fed with total mixed rations constituted by Tifton hay (50,4%) and concentrated (49,6%). The Tifton hay was ground in commercial miller and sieved at 3,2; 4,8; 7,9; 15,9 and […]

A serie of experiments was carried out with the objective to determine the nutritive value of nine poultry by-product meal and six feather meal for chickens. Four different methodologies were used to determine the values of N corrected apparent (AMEn) and true corrected (TMEn) metabolizable energy, where the traditional method was used with chicks and cocks and the Sibbald method was used with roosters and cecectomized cocks. The estimated AMEn and TMEn values of viscera meal ranged from 3,051 to […]

Two experiments (E) were conducted, using 204 Large White piglets (E1: from 7.23 to 12.32 kg; and E2: from 12.64 to 23.81 kg). A randomized block design was used, with four levels of threonine in the ration (E1: 0.80; 087; 0.93 e 0.99%; e E2: 0.69; 0.74; 0.80 e 0.85 %); eight (E1) and nine (E2) replicates for daily intake (DI), daily weight gain (DWG), adjusted daily weight gain (ADWG) and feed conversion (FC) and five replicates for plasma urea […]

The objective was to evaluate the effects of vitrification of immature bovine oocytes after in vitro culture, by the use of cryoprotectors ethylene glycol. Oocytes from cows ovaries from slaughters houses were randomly alocated into three treatments. Treatment 0 (control): frozen-thawed undesnude oocytes; treatment 1, immature vitrificated undesnude oocytes dehydrated for 5 minutes in each of the following solutions of 20, 20 and 40% of ethylene glycol, respectively, associated to 0.3 Mol l-1 of trehalose and 20% of PVP, in […]

It was aimed to study the efficiency of microbial synthesis and ruminal parameters in bovine. It were used five 165 kg growing no-castrated Nellore bulls, rumen, abomasum and ileum fistulated.A randomized blocks design with four treatments and five collection periods was used. The treatments consisted of four concentrate levels (20, 40, 60 and 80%). The roughage used was Tifton 85′ (Cynodon dactylon (L.) Pers.) Bermudagrass hay. The diets were isonitrogen with 15% of crude protein. The microbial marker used was […]

One experiment was carried out using 120 laying Isa Brown chickens fed diets containing sugar-cane yeast, to determinate the methionine+cystine (met+cys) requirements. The birds were 51 weeks old at the beginning of the experiment, with the duration of 84 days, with three periods of 28 days each. A completely randomized block design with five treatments and four replications was used. The treatments consisted of a basal diet supplemented with five levels of DL-methionine in order to obtain diets with 0.45, […]

The objective of the present study was to evaluate the nutrients apparent digestibilities in growing rabbits fed diets with different starch levels (22 or 32% on average) by high or low inclusion of corn grain and different fiber sources (alfalfa hay or soybean hulls), in 2×2 factorial outline. The diets were pelleted and supplied to 64 New Zealand White rabbits (16 replicates per treatment), weaned at 34 days, housed individually in metabolism cages and allotted to a complete randomized design. […]

Two experiments were conducted with the objective of evaluating the use of high- moisture corn silage for growing horses. In the first experiment 12 male foals, 11 months old, with live weigth of 232.17±10.22 kg, were used in a digestibility trial to determine nutritional feeding value of high moisture corn silage. Two diets were used, a reference diet and one test diet, in which high- moisture corn silage replaced 25% of reference diet on dry matter basis. Total feces collection […]