J. Anim Sci.
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J. Anim Sci. 1972. 34:630-635.
© 1972 American Society of Animal Science
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Adrenal Function in the Cow. Diurnal Changes and the Effects of Lactation and Neurohypophyseal Hormones1

W. C. Wagner and S. L. Oxenreider2, 3,

Iowa State Universty, Ames, Iowa 50010

Abstract

Using indwelling jugular vein cannulas, blood samples were collected at 30-min. intervals during a 24-hr, period to determine the effect of differing lactation regimens and diurnal variation on plasma corticoids in nine cows (three non-lactating, three milked and three suckled). Plasma corticoids were measured by the protein-binding method. Corticoid levels (mean±S.E.) were 4.5±0.04, 6.8±0.05 and 9.4±0.09 ng/ml for non-lactating, milked and suckled groups, respectively. Levels for non-lactating and suckled groups were significantly different (P<.05). Data from all nine animals were pooled for consideration of diurnal effects. Values (mean±S.E.) were 7.34±0.53, 7.51±0.68 and 5.31±0.40 ng corticoid/ml for 0200–1000, 1000–1800 and 1800–0200 hr., respectively. The 5.31 value for 1800–0200 hr. was significantly lower than the other two time periods (P<.05). A significant (P<.01) rise in plasma corticoids occurred during and for 15 min. after milk removal (suckling or milking). The blood level was 8.3 ng/ml during this stimulatory period and 5.4 ng/ml before and after this period. Intravenous administration of two synthetic oxytocin preparations and vasopressin at dose levels of 2, 5 and 10U did not cause a significant rise in plasma corticoids except with the 10U dose of vasopressin. The 10U dose of vasopressin caused a three-fold rise in plasma corticoids that lasted for 20 to 25 minutes.

Footnotes

1 This research was performed under contract No. NIH 69-2213, from the Center for Population Research, NICHD.

2 Veterinary Medical Research Institute.

3 The authors gratefully acknowledge the technical support of P. Harris and R. Strohbehn.






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Copyright © 1972 by the American Society of Animal Science.