THE RELATION BETWEEN OVULATION FREQUENCY AND THE INCIDENCE OF FOLLICULAR ATRESIA FOLLOWING SURGICAL OPERATIONS IN THE DOMESTIC HEN

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Abstract
The incidence of follicular atresia was studied in 6 groups of domestic hens subjected to one each of the following operations: removal of the most recently ruptured follicle, (111 birds), removal of the next older follicle (51 birds), removal of a follicle older than either of the first two (39 birds), sham ovarian operations (35 birds), operations on the right side of the body cavity (sham) (15 birds), and operations on the breast muscle (37 birds). It was found that in all the groups which were subjected to abdominal operations the incidence of atresia was inversely proportional to the frequency of ovulation preceding operation. The induction of atresia was associated with the effects of abdominal operation per se, rather than with the removal of an ovarian element. Operations performed on the breast muscle, however, resulted in a negligible incidence of atresia. The incidence of atresia was directly related to the loss in body wt. following operation, in birds of the same or similar ovulation frequencies. However, proportionately much greater increases in the incidence of atresia occurred in birds of similar body wt. changes in relation to decreases in ovulation frequency, than they did in birds of similar ovulation frequency in relation to increases in wt. losses. It is assumed that the induction of atresia is mediated through the pituitary gland.
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