Body weight at hatch was 3.4 g less and YFBM was 3.0 g less in the high EST treatment when compared with the normal
EST treatment (P < 0.001). Chick length did not differ between EST treatments (P = 0.14) and was on average 19.6 cm. Residual yolk weight was 0.5 g lower in the high than in the normal EST treatment (P = 0.05).