One hundred and twenty-eight pigs, averaging initial weight of 4.32 ± 0.55 kg and weaned with 14 days of age, were allotted to a completely randomized experimental block design, composed by four treatments, eight replicates and four animals in each experimental unit, to evaluate the levels of inclusion of spray dried plasma (SDP) in diets for piglets, in three consecutive periods: from 14 to 28 (period 1); 29 to 35 (period 2) and 36 to 42 (period 3) days of […]

An experiment was carried out to evaluate digestible lysine requirement for male broilers chicks of Ross line from 1 to 11 days old. A total of 1050 one day old male chicks were fed with five isoenergetic (2,950 kcal ME/kg) and isoproteic (23% CP) diets, with digestible lysine levels of 1.12, 1.17, 1.22, 1.27 and 1.35%. A completely randomized bloc design was used with seven replications of 30 birds per experimental unit. A comparative slaughter technique was conducted to determine […]

This study was carried out to evaluate the performance of Nile tilapia, cultured in net pens, and fed diets containing 27.0 (control), 25.2, 24.3, and 22.7% of digestible protein. Crystalline amino acids (L-lysine, DL-methionine and L-threonine) were added to keep amino acid levels according to the ideal protein profile and to simulate amino acid levels of the control diet. Fish (34.63±1.19 g) were hand-fed one of the four isoenergetic (3,075 kcal of digestible energy/kg, as fed basis) experimental diets until […]

This experiment was conducted to determine the dietary threonine requirements for Nile tilapia. The fishes (37.61 ± 1.16 of initial weight) were allotted to a completely randomized design with four treatments, three replicates and 25 fishes per experimental unit. It was used a reference diet with 27% of CP and 3,000 kcal of DE/kg, supplemented with L-threonine, resulting in diets with 0.92, 1.06, 1.21, and 1.35% of total threonine. Synthetic amino acids were added to mantain their profile according to […]

A trial was carried out to determine the nutritional requeriments of methionine + cystine (M+C). A total of 360 laying hens was allotted to a completely randomized design with five treatments and 12 replicates of six birds. The corn-soybean meal based diets were formulated to be isonitrogenous (17.2% CP) and isoenergy (2,800 kcal ME/kg) to meet the bird requeriment in all nutrients, except for M+C, that was supplemented with DL-methionine (99%) in replacement with corn starch. The following total M+C […]

Three experiments were conducted to determine the arginine requirement and the digestible arginine:lysine ratio of broiler males, from 1 to 20, 24 to 38 and 44 to 56 days of age. A completely randomized design with five levels of arginine, six replicates and 20 birds per pens from 1 to 20 and 24 to 38, and 16 birds per pens from 44 to 56 were used in each experiment. The concentrations of digestible arginine were 1.10-1.34 (increase of 0,061), 1.083-1.296 […]

Three assays were carried out to determine the threonine requirement and the digestible threonine:lysine ratio of broiler males, Avian Farm, from 1 to 20, 24 to 38 and 44 to 56 days of age. A completely randomized design with five levels of threonine, six replicates and 20 birds per pen from 1 to 20 and 24 to 38, and 16 birds per pens from 44 to 56 were used in each experiment. The concentrations of digestible threonine were 0.684 to […]

Three hundred 49-days old Japanese female quails, averaging 138.0g, were used to estimate the requirement of digestible lysine level for Japanese quail in completely randomized block design with five replicates of ten females per experimental unit. The treatment consisted six levels of digestible lysine (0.80, 0.90, 1.00, 1.10, 1.20 and 1.30%) and the analyzed traits were rate of egg production (%), egg weight (g), egg mass (g of eggs/quail/day), feed intake (g), feed consumption: weight gain ratio (g of diet/g […]

Seven sheep fed S. guianensis hay were used to evaluate ruminal amino acid degradability, nitrogen balance and rumen volatile fatty acid (VFA) concentrations. Nylon bags technique was used for determination of the in situ degradabilities of amino acids. Bags were collected at 6, 24 and 48 hours after insertion. Duodenum and feces samples were used to determine amoniacal-N and non-amoniacal-N. To determine ruminal VFA concentrations, samples of 80 mL were collected immediately before feeding and 2, 4, 6 and 8 […]

A trial was carried out to determine lysine requirements for castrated males during finishing phase of two genetic swine groups, based on the ideal protein concept. Sixteen animals from genetic common group (GCG) were used and another sixteen, from the genetic improved group (GIG) were allotted to four treatments. The treatment consisted on a basal diets, based on corn and soybean meal containing 0.60% of lysine and other three diet, adding increasing lysine levels to achieve 0.75, 0.90 and 1.05% […]