The data used to calculate
the variance components of various production traits was obtained from
records of about 4000 hens daughters of about 180 cocks mated to about
1,500 dams and collected over 5 year period. Two strains of Rhode Island
Chickens were involved in this study. Within the red strain population
sire`s contribution to total variation in age at first egg did not exceed
8.6% across the year and 6.9% in the white strain. Except for body weight
at 40 weeks of the red strain where the contribution of the sire exceed
14%, the contribution of the sire to the total variation for all the
economic traits considered in this study were generally low for both
strain of the layer type chickens under consideration. Generally dam
component of variance were higher most of the time and in many traits
within the red strain population.
I.A. Adeyinka , O.O. Oni , B.I. Nwagu and F.D. Adeyinka , 2006. Components of Variance for Some Economic Traits
among Rhode Island Chicken Bred in the Northern Guinea Savanna Zone
of Nigeria. International Journal of Poultry Science, 5: 579-582.