Wada et al. (2003) observed ghrelin
mRNA expression only in the proventriculus of newly
hatched Leghorn chicks, whereas in adult chickens,
mRNA expression was also detected in proventriculus
and duodenum. This is similar to the tissue expression
patterns reported previously for 8-week-old White
Leghorn chickens (Tanaka et al., 2003) and 10 day-old
broiler chicks (Geelissen et al., 2003).