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Journal of Dairy Science Vol. 27 No. 7 539-543
© 1944 by American Dairy Science Association ®
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Observations on the Effects of an Anterior Pituitary Preparation Administered to Lactating Dairy Cows*

J. F. Sykes, I. A. Gould, C. W. Duncan and C. F. Huffman

Sections of Physiology, Dairy Husbandry and Chemistry, Michigan Agricultural Experiment Station, East Lansing, Michigan

ABSTRACT

Injection of an alkaline extract of the anterior pituitary gland into lactating cows produced an initial increase in the per cent fat of the milk and moderate increases in lactose and solids-not-fat. The chloride content was generally inversely proportional to the lactose level.

Continued injections produced even more marked changes. Generally, the fat, lactose and solids-not-fat declined to very low levels and the chloride increased. Marked irregularities occurred from day to day. These latter effects have not been observed to occur earlier than the fifth day of injection and in one animal injections given for twenty-four days failed to produce them. Swelling of the udder and ropy milk accompanied these changes.

The extract likewise produced cystic ovaries in all the cows to which it was given and mummified fetuses were removed from two of the three pregnant animals used following the injection period.

Preliminary work indicates that the changes in fat percentage of the milk were not due to the ovarian stimulation which was produced by the extract and it would appear that these changes were due to some hormone other than the gonadotropins contained in the extract.

FOOTNOTES

* Published with the approval of the Director of the Agricultural Experiment Station as Journal Article No. 673 (N.S.).






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Copyright © 1944 by the American Dairy Science Association ®.