which could have explained the lower BW of chicks hatched at high altitude. Increased weight loss may also
have reduced YFB of chicks incubated at high EST in the present study because high EST increases the partial
water vapor pressure between egg and air (Meijerhof and
Van Beek, 1993). Weight loss between setting and transfer
at 19 d of eggs that hatched was 11.5% in eggs incubated
at 37.8ฐC EST and 12.4% in eggs incubated at 38.9%. Regression
analysis showed that BW and YFB decreased
with WL at a significant higher rate in chicks that hatched
after exposure to high EST compared with normal EST
(P < 0.05) and that RY was not affected at all by WL or
EST. There were no significant correlations between WL
and HT for BW, YFB, or RY (P > 0.05