This research had the objective of evaluating the effect of growing levels of dry yeast of alcohol (LSA) to the laying hen diet. One hundred and twenty Isabrown laying hens were used with 33 weeks of age, in a randomized complete block design, with five treatments, four replicates and six birds per pen. The diets (18% CP, 2800 kcal ME/kg, 3,8% Ca and 0,38% AP), were formulated based on corn and soybean meal, with five levels of LSA inclusion: 0; 7; 14; 21 and 28,0%. The levels of LSA did not affect the production of hen per day (PGD=94,71± 0,96%), egg weight (PO=64,35± 0,85g), chicken weight (PMF=1.872,07± 50,36g), weight gain (GP=-52± 25,84g), and moisture of faeces (UE=75,85± 3,81%). Quadratic effect was observed for the variables feed intake (CR=117,03-0,34LSA+0,02LSA²) and feed conversion for dozen of eggs (CADO=1,48-0,0025LSA+0,00023LSA²). Linear effect was observed for the variable feed egg mass ratio (CAMO=1,867+0,0072LSA). The use of up to 14% of LSA provided similar performance as compared to that obtained with the diet based on corn and soybean meal. The economic analysis shows that LSA can be used up to 28%.
dried yeast; egg production; laying hen
