It was evaluated the effect of diets supplemented or not supplemented with ractopamine and digestible lysine on the performance and carcass characteristics of finishing pigs. A total of 50 barrows and 50 gilts (90.2 kg ± 3.5 kg) were used. In the growth performance trial, a randomized block design was utilized in a 5 x 2 factorial arrangement, consisting of five levels of digestible lysine (0.68; 0.78; 0.88; 0.98 and 1.08%) and two levels of ractopamine (0 and 5 ppm), […]

This work was carried out to evaluate levels of L-glutamine and L-glutamate in diets for Nile tilapia juveniles (0.60 ± 0.1 g). A complete randomized experimental design with four diets and three replicates and 90 fish per experimental unit was used. It was used a control diet with 29% of digestible protein and 2,940 kcal/kg of digestible energy supplemented with L-glutamine and L-glutamate at the proportion of 0, 1, 2 and 3% of diet, during 85 days. It was not […]

In this experiment it was aimed to determine the best levels of digestible lysine for laying hens in production period. Performance, nutrients intake, metabolism, egg quality, blood parameters and development of reproductive tract for 160 Hy-Line W-36 hens at 25 weeks of age. Hens were distributed in a completely randomized design with four levels of digestible lysine (600, 700, 800 or 900 mg of Lys/kg) and four replicates by using a split spot scheme was used at evaluation of nitrogen […]

The objective of this study was to analyze the effect of the addition of alanine, glycine and glutamine on frozen seminal extender of Mangalarga marchador breed stallions. Five stallions were used from the Lugavi stables. Three ejaculates from each stallion were divided into six treatments: without the addition of amino acids, addition of 40 mM alanine, addition of 40 mM glycine, addition of 60 mM glutamine, addition of 7 mM glycine, alanine 7 mM + 20 mM glutamine and addition […]

The objective of this study was to reevaluate the requirements of Methionine+cystine (met+cis total) of light (L) and semi-heavy (SH) pullets at 5 to 11 weeks of age considering the physical shape of the feeds and the performance in the 22 to 40 week period, the laying phase. A total of 1,120 laying pullets (560 lightweight and 560 semiheavy) in a randomized completedesign in a 5 ×2 ×2 factorial scheme with 20 combinations consisting of five total Met+Cys levels (0.56; […]

This research was carried out using 360 laying hens (180 Lohmann LSL and 180 Lohmann Brown), to establish the nutritional requirement of digestible methionine+cystine in the period from 54 to 70 weeks of age. A completely randomized experimental design, in a 5 × 2 factorial arrangement (5 levels of digestible methionine+cystine and 2 laying hen strain), with 6 replications and 6 hens per experimental unit, was used. The treatments consisted of diets supplemented with 5 levels of DL-methionine (98%), resulting […]

The objective of this work was to determine the physicochemical composition and metabolizable energy values of guava and tomato meal for free range broilers. The physicochemical composition was analyzed and later the metabolism assay was performed with sixty Caipirão lineage 65-day-old free range broilers distributed in a completely randomized design with three treatments and five replicates of four birds each. The treatments were: reference diet and two test diets, one with 70% of reference diet and 30% of guava residue […]

The objective was to estimate the nutritional requirements of digestible lysine for Japanese laying quails. Two hundred and forty Japanese quails were allotted to a completely randomized block designs, with five diets, with six replications of eight birds each. Diets consisted of a basal ration deficient in lysine and supplemented with five levels 0.88, 0.96, 1.04, 1.12 or 1.20%) of digestible lysine. Feed consumption, egg production, egg weight and egg mass, feed conversion by egg mass (FCEM) and by dozen […]

The effects of dietary energy, lysine and methionine + cystine levels on performance, carcass and cuts yields of male and female broiler chickens were evaluated. The experiment was analyzed as a completely randomized experimental design in a 3 × 2 factorial arrangement composed by six diets and eight replications (four males and four females). The diets consisted of energy (low, middle and high) and lysine and methionine + cystine (standard and + 10%) levels and of raising period (1 to […]

This study was carried out with the objective of estimating the nutritional requirements of digestible lysine for broiler from 1 to 42 days old. A total of 1,950 male Cobb chicks were used (750, 600 and 600 in pre-initial, initial and growing phase, respectively) with initial weight of 45.1 ± 0.6, 160.5 ± 2.4 g and 746.3 ± 10.7 g, respectively. The birds were distributed in a completely randomized design, using six treatments and five repetitions, with 25, 20, and […]