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Digestible lysine and arginine levels of broilers in pre-starte ration.

Abstract:

An experiment was carried out in order to evaluate digestible lysine and arginine levels of broilers in pre-starte ration (1 to 7 days of age). The experiment was carried out in poultry facilities of the University of Goiás, Goiânia, Brazil, allotted in a factorial arrangement 2× 3 (2 digestible lysine levels-1.056 and 1.305%× 3 digestible arginine levels-1.305, 1.459 and 1.613%) with 6 treatments and 5 replicates of 11 birds each. The variables tested included performance from 1 to 7 and 1 to 21 days (mean weight gain, mean body weight, feed intake, feed-to-gain ratio and mortality) and digestibility assay from 4 to 7 days, to calculate digestibility coefficients (DIG) and nitrogen retention (RET). The results were analyzed by Tukey test (5%) and polynomial regression. Arginine affected feed intake from 1 to 7 days and feed-gain ratio from 1 to 7 and 1 to 21 days of age. No differences in digestibility were observed. To lysine, no effect on performance was observed, but digestibility coefficients (DIG) and retention (RET) for dry matter and nitrogen were reduced.