The implications related to weight variation ofthe ovarian
stroma are not well documented. It is known that a
larger weight is suggestive of larger numbers of small yellow
follicles entering follicular hierarchy (Gilbert et al.,
1983) which in turn could positively influence the egg production
rate of the batch. However, in the present study, a
difference in stroma weight was not observed in birds at
12 weeks of age. Pyrzak et al. (1987) observed that hens
kept in blue light have a lower percentage of yolk, suggesting
that this type of light affects the development of the
stroma. This result was also observed in this study, along
with the green LED light, in birds at eight weeks of age