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; […]

The objective of this study was to evaluate the total methionine+cystine requirements in function of crushed and ground diets and pullet strain (light and semi-heavy) from 1 to 4 weeks of age. One thousand and sixty 1-day-old pullets were used as follows: 800 Dekalb White pullets and 800 Bovans Goldline pullets, weighting 34.52 ± 0.26 g and 36.41 ± 0.22 g, respectively. The experimental design was completely randomized in a 5 × 2 × 2 factorial scheme (0.65; 0.70; 0.75; […]

With the objective of determine the nutritional requirement of lysine for growing white-egg and brown-egg laying hens in the period from 1 to 3 and 4 to 6 weeks of age, 480 birds were used in the period from 1 to 3 weeks of age and 432 birds in the period from 4 to 6 weeks of age. In both periods, Hy-line birds were used; 50% Hy-line W 36 (White) and 50% Hy-line Brown in completely randomized design in a […]