Abstract
Summary and Conclusions
Quantitative avidin assays of the various portions of the oviducts of 21 actively laying and of 10 non-laying hens indicate (1) that avidin is found at all levels of the magnum, or albumen-secreting portion of the oviduct of the laying hen, (2) that avidin does not occur in either the isthmus or uterus of the laying hen, (3) that avidin is not found in the atrophic magna of non-laying hens, and (4) that the avidin content of regions of the magna below the level of an oviducal egg is higher than in regions above the egg. Avidin production appears to be associated, either directly or indirectly, with complete reproductive function of the ovary.
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