Fig. 4. Very-low density lipoprotein (VLDL) particle diameter distributions of laying and non-laying female (A) zebra finches and (B) chickens. Grey shading indicate estimates of yolk-targeted VLDL (VLDLy) particle diameter range based on (in A) the proposed sieving properties of the ovary limiting access of VLDL particles to the developing ovarian follicles (sVLDLy range: 25–44 nm) or (in B) the idea that there is a positive relationship between VLDL particle diameter classes and laying rate in chickens that are better able to support continuous egg production (cVLDLy range: 21.5–51.1).