Brief communication. A genetic marker in the growth hormone receptor gene associated with body weight in chickens

Abstract

cial interactions Some studies have found significant effects of the presence of other males on timing of development In this experiment, temperature, day length, and water quality were controlled. Per aquarium density and the numbers of male siblings in the same aquarium were kept as constant as possible but are two other possible sources of variation in developmental timing. Although we do not have enough observations per population and a wide enough range of values to statistically examine this effect, it does not appear to be significant.