VARIATION IN PLASMA-CHOLESTEROL CONCENTRATION OVER TIME IN THE DOMESTIC-FOWL

1. Variations in the concentration of plasma cholesterol available to the developing oocyte over a three week period in Gallus domesticus ar e described. 2. There are small changes in concentration between weeks for individual birds, but no changes between consecutive days within weeks or times within days. 3. It is recommended that future attempts to assess the relationship between variation in blood and yolk cholest erol concentrations estimate blood cholesterol concentration from two samples taken a week apart.