It was studied the better digestible lysine:metabolizable energy (LIS:ME) and the effects of LIS and ME levels on performance and nitrogen retention in nursery piglets. In assay 1, 216 commercial piglets from 6.98 ± 1.16 kg (initial weight) at approximately 12 ± 0.62 kg were used and in the assay 2, 48 similar piglets at 9.31 ± 2.09 kg. The LIS levels were: 1.223, 1.302, 1.390 and 1.497% and ME: 3,510, 3,700 and 3,830 kcal/kg and were assigned in 3 […]

With the objective of evaluating the effects of the number of animals per experimental unit and the type of feeder on the nutritional requirement and carcass characteristics of pigs from 60 to 95 kg, 704 castrated male pigs with initial body weight of 59.84 ± 1.67 kg were used. The animals were distributed in a randomized experimental design subdivided into parcels, with different number of animals per experimental unit (EU) and in the subplots, a 2 × 4 factorial scheme, […]

With the objective to establish the nutritional requirement of lysine for light and semi-heavy laying hens, in the period from 34 to 50 weeks old, 360 laying hens (half Lohmann and half Lohmann Brown) were submitted to a basal ration containing 2.850 kcal ME/kg, 15.0% CP, supplemented with five levels (0.00, 0.05, 0.10, 0.15 and 0.20%) of L-lysine, to provide 0.584, 0.634, 0.684, 0.734, and 0.784% of digestible lysine in the rations. A 5 x 2 (lysine level and laying […]

The experiment was carried out to estimate the level of digestible threonine for laying japanese quail during 63 days. A total of 400 japanese quails, with inicial age of 57 days were allotted to a complete randomized experimental design with five treatments, eight replicates and ten birds per experimental unit. The basal diet, deficient in threonine and with 20% C, 2,910kcal ME/kg, was supplemented with five levels of L-threonine 98% (0.018, 0.074, 0.128, 0.183, and 0.239%), corresponding to digestible threonine: […]

With the objective to establish the nutritional requirement of threonine for light and semi-heavy laying hens in the period from 34 to 50 weeks old, 580 laying hens (half Lohmann and half Lohmann Brown) submitted to a basal ration containing 2.850 kcal ME/kg, 14.0% CP, supplemented of five levels (0.00, 0.035, 0.07, 0.105, and 0.140%) of L-threonine, in order to provide 0.410, 0.445, 0.480, 0.515, and 0.550% of digestible threonine in the rations. A 5 x 2 (threonine level and […]

A trial was conducted with fifty pigs (Landrace x Large White), barrows and gilts, from 15 to 30 kg, in the initial growing phase to determine the digestible sulfur amino acids requirements. The animals were allotted to a completely randomized experimental block design, with five treatments (0.502, 0.530, 0.558, 0.586, and 0.614% of digestible methionine plus cystine), five replicates and two animals (one male and one female) per experimental unit. It was observed quadract effect of treatments on daily weight […]

The true digestibility coefficients of amino acids (TDCaa) were determined and digestible amino acids prediction equations obtained, using the chemical composition of 11 feedstuffs. The feedstuffs evaluated were: brown flour meal, wheat flour, wheat grain, wheat grain residue, wheat germ, cookies residue, macaroni residue and, four wheat brans. The method of “precision feeding” with cecectomized adult rooster was utilized. A randomized complete design was used, with 11 feedstuffs and 1 fast, using six replications with 1 rooster per experimental unit. […]