J. Anim Sci.
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J. Anim Sci. 1947. 6:50-55.
© 1947 American Society of Animal Science
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Carotene Blood Levels and Reproductive Performance in Range Hereford Cattle1

Merle G. Payne and H. E. Kingman2

Colorado Agricultural Experiment Station

Abstract

In order to support normal gestation the carotene blood-plasma level of first-Calf range Hereford heifers must be considerably higher than that for aged Hereford cows.

The results indicate that the carotene blood-plasma level of first-calf range Hereford heifers must be at least 117.75 ±7.21 micrograms per 100 ml. in order to support normal gestation.

Range Hereford heifers with carotene blood plasma level of 97.18 ± 7.68 micrograms per 100 ml. showed clinical symptoms of a carotene deficiency, so-called nutritional abortions, and cases of retained placentas.

A breeding herd of range Hereford aged cows with an average carotene blood-plasma level as low as 82.88± 4.11 micrograms per 100 ml. showed no clinical symptoms of a carotene deficiency and no so-called nutritional abortions over a two-year period. Therefore, such a carotene blood-plasma level may be considered adequate for health and reproduction for range Hereford aged cows in this area.

Footnotes

1 A cooperative study between the Wyoming Hereford Ranch Trust, Cheyenne, Wyoming, and the Colorado Agricultural Experiment Station, Fort Collins, Colorado. Published with the approval of the Director of the Colorado Agricultural Experiment Station, Fort Collins, Colorado, as Scientific Series Paper No. 208.

2 Associate Chemist, Colorado Agricultural Experiment Station; Veterinarian, Wyoming Hereford Ranch Trust, Cheyenne, Wyoming, respectively.






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Copyright © 1947 by the American Society of Animal Science.