title: Effects of light environment on the weight of bursa of Fabricius in White Rock chicks.
abstract: The weight of the bursa of Fabricius of White Rock chicks reared under two photoperiods was studied in relation to body weight, weight of the endocrine organs, and spleen using a multiple correlation method. At the 95% level of confidence the coefficient of determination suggested that the weight of the bursa could be predicted with 77% plus or minus 7.8% accuracy from the organs weighed for a period from 2-24 weeks, the weight of the pituitary being the most stable contributor to this prediction. The weight of the spleen, similarly, could be predicted with a 92% plus or minus 3.8% accuracy. Correlations of testes and thyroid weight with bursa weight suggested possible influence of testosterone and thyroxin on bursa-spleen relationships during the period of bursal growth and involution.
mesh_terms: D000311:Adrenal Glands / Q000033:anatomy & histology; D000375:Aging; D000818:Animals; D001835:Body Weight; D002060:Bursa of Fabricius / Q000033:anatomy & histology*; D002645:Chickens / Q000033:anatomy & histology*; D007031:Hypothalamus / Q000033:anatomy & histology; D008027:Light; D008297:Male; D009929:Organ Size; D010870:Pineal Gland / Q000033:anatomy & histology; D010902:Pituitary Gland / Q000033:anatomy & histology; D013154:Spleen / Q000033:anatomy & histology; D013737:Testis / Q000033:anatomy & histology; D013950:Thymus Gland / Q000033:anatomy & histology; D013961:Thyroid Gland / Q000033:anatomy & histology