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Effects of light environment on the weight of bursa of Fabricius in White Rock chicks.

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.