This study was aimed to evaluate the effects of the dietary digestible lysine levels and environmental temperature on performance and carcass characteristics of broiler chickens from 22 to 42 days-old. Six hundred seventy two males Ross® broiler chickens with an average weight of 726 g were allotted to a completely randomized design, in a 4 × 4 factorial arrangement with six replicates and seven birds per experimental unit. The chickens were fed with different digestible lysine levels in the diet […]

This experiment was carried out to evaluate the tryptophan (Trp) requirements and the recovery performance pattern of laying hens fed Trp-deficient diets. One hundred sixty Hisex White commercial laying hens were randomly distributed in five Trp levels in the diets (0.13, 0.15, 0.17, 0.19 and 0.21% ) with eight replicates of four birds. The laying hens remained for two weeks in adaptation (51 to 52 weeks), for six weeks for evaluation of Trp requirements (53 to 58 weeks) and for […]

An experiment was conduced with the objective of evaluating the effects of diet formulation methods and supplementation of ractopamine (RAC) on the performance and carcass characteristics of finishing barrows. Sixty commercial hybrid swines were used, distributed in a randomized experimental block design, in a 2 x 3 factorial arrangment, with two levels of RAC and three methods of diet formulation. Supplementation with RAC improved the final weight, daily weight gain (DWG) and feed conversion (FC) of the finishing barrows. Addition […]

The aim of this experiment was to evaluate dietary protein requirements of freshwater angelfish fry. A complete randomized design with four dietary crude protein levels (34, 38, 42, and 46% of CP) and four replicates was used. Fish averaging 0.44±0.05 g were reared in sixteen 25L-aquarium with aeration, biological filter and controlled temperature (26 ± 0.5°C), in a stocking density of six fish/aquarium. Fish were fed ad libitum at 8:00 a.m., 11:00 a.m., 2:00 p.m, and 5:00 p.m, during 60 […]

This experiment was conducted to evaluate different levels of digestible energy on the performance of Nile tilapia larvae (Oreochromis niloticus) during the sexual reversion phase. Three hundred and seventy-five larvae with initial average length and weight of 21.0±4.0 mg and 1.19±0.72 cm, respectively, were allotted to 25 30L-aquarium. A completely randomized design with five treatments and five replicates was used. The aquarium with 15 larvae was the experimental unit. The diets were formulated to contain levels of 3,300, 3,525, 3,750, […]

Two experiments were conducted with the objective of evaluating the methionine + cystine (Met + Cis) requirements, for Ross broilers, males, from 22 to 42 and 43 to 49 days old. Nine hundred broilers averaging initial body weight of 0.800 kg at 22 days old and 2.540 kg at 43 days old were used in each experiment and allotted to a completely randomized experimental design, with six treatments, six replicates and 25 birds for experimental unit. The treatments consisted of […]

Two experiments were conducted with the objective of evaluating the lysine requirements for Ross broilers, males, from 22 to 42 and 43 to 49 days old, maintaining 71% met + cys:lys ratio. Nine hundred broilers averaging initial body weight of 780 g at 22 days old and 2.556 g at 43 days old were used in each experiment and allotted to a completely randomized experimental design, with six treatments, six replicates and 25 birds by experimental unit. The treatments consisted […]

This work aims to evaluate yield production and composition of milk of Mangalarga Marchador mares and average weight gain of suckling foals. Milk yield was evaluated in eight mares by the weigh-suck-weigh method, at intervals of two hour, twelve times a day. Daily milk produced was estimated by summing of the twelve observations. Milk yield was performed at 20, 40, 60, 80, 100, 120, 140 and 160 days of lactation. The milk was analyzed for lactose, protein, fat and energy […]

Seven hundred and twenty and six hundred chicks, males and females, from 22 to 42 and from 43 to 53 days old, respectively, fed a basal diet (3100 and 3210 kcal ME/kg and 19.6 and 18.6% CP) deficient in sodium (0.017%), supplemented with NaCl, corresponding to the levels of .077, .137, .197, .257 and .317% of total sodium were used to determine the sodium requirements for broilers during the growing and final phases. A completely randomized design, in a 5×2 […]

Four experiments were accomplished, where two for determine requirements calcium (whit- egg pullets and brown- egg pullets) and two for determine available phosphorus (white-egg pullets and brown-egg pullets). Two different phases (growing and production) were used for each experiment, where the chickens were allotted to a completely randomized design with five calcium levels (.55, .65, .75, .85, and .95%) or five available phosphorus levels (.20, .25, .30, .35, and .40%), four replicates and 12 pullets/EU for the growth phase (13 […]