Selection for body weight at eight weeks of age. 20. Production traits and the B and C alloantigen systems.
The current study evaluated influence of genotypes of the B and C alloantigen systems on production traits in lines of White Plymouth Rock chickens. Lines had been selected previously for high (HWS) or low (LWS) 8-wk BW and after 27 generations of selection, a random sample of each selected line was used to initiate subpopulations in which selection was relaxed. For the present study, blood typing was used to identify allelic frequencies for the B and C systems for five consecutive generations of selection (Generations 30 through 34) and three consecutive generations of relaxation (Generations 5 through 7). Haplotypes for the B complex were assigned designations B32, B33, B34, and B35 and alleles of the C system were assigned C8, C9, C10, and C11. Production traits for males were BW at 4 and 8 wk of age, and for females were BW at 4, 8, and 38 wk of age, age and BW at production of first egg, percentage of normal eggs, and percentage of normal hen-day egg production. There were no differences in production traits among B genotypes or among C genotypes, although some time trends in gene frequencies suggested that more subtle effects may be present.
Boa-Amponsem
K
K
Poultry Science Department, Virginia Polytechnic Institute, Blacksburg, Virginia 24061.
Briles
W E
WE
Briles
R W
RW
Dunnington
E A
EA
Siegel
P B
PB
D000818:Animals; D001835:Body Weight; D002645:Chickens / Q000033:anatomy & histology / Q000235:genetics; D005260:Female; D005838:Genotype; D007519:Isoantigens / Q000235:genetics*; D008285:Major Histocompatibility Complex; D008297:Male; D010058:Oviposition
D007519:Isoantigens