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EFFECTS OF AVIAN AND MAMMALIAN PITUITARY PREPARATIONS ON FOLLICULAR GROWTH IN HENS TREATED WITH METHALLIBURE OR FASTING

Summary.: Hens with regressed ovaries produced by treatment with Methallibure (0·02% concentration in the ration) or by fasting received injections of avian or mammalian pituitary preparations to induce follicular growth in their ovaries. The preparations used were homogenates or acetone-dried powder of fowl, Gallus domesticus, anterior pituitary (CAP), glycoprotein-extract obtained from CAP, the unadsorbed fraction of glycoprotein-extract on CM-cellulose, the unadsorbed fraction of glycoprotein-extract on DEAE-cellulose, acetone-dried bovine anterior pituitary, NIH-FSH of ovine origin, ovine NIH-LH, and a mixture of FSH and LH.

The administration of preparations originating from CAP resulted in an increase of the serum vitellin titre and the formation of large yellow follicles. By contrast, the serum vitellin titres in almost all the hens injected with mammalian preparations did not show the same increase. Ovarian stimulation, shown by increase in the size of white follicles or the existence of recently formed atretic follicles, was found in 42% of hens treated with mammalian preparations. Yellow follicles were observed in only a few of these treated hens, and there were not as many follicles of graded size as in hens treated with preparations of CAP origin.

It was suggested from these results that fowl pituitary constituent(s) were necessary to cause a substantial follicular growth in the regressed ovary of the hen.