THE BLOOD CALCIUM RESPONSE OF THE CHICKEN TO PARATHYROID EXTRACTS1

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Abstract
THE (PTH) on blood calcium of birds are inconsistent and inadequate. A few investigators have reported that these extracts increased blood calcium in the pigeon (1), and in the laying hen (2, 3), but an even larger number have reported negative results: i.e.; chickens (4, 5, 6, 7, 8, 9); ducks (10). Yet certain findings suggest that the bird, particularly the chicken, does respond to PTH injections. The case of the laying hen with idiopathic hypoparathyroidism that responded to PTH treatment (11) is not to be overlooked. More important, Polin and Sturkie (13) observed a remission of symptoms in parathyroidectomized chickens injected with PTH, but the effects of the injection persisted for only 8-10 hours. This prompted further investigation into the problem of the PTH effect on blood calcium of the chicken.

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