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Journal of Dairy Science Vol. 66 No. 12 2557-2562
© 1983 by American Dairy Science Association ®
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Relation of Age, Season, Production, and Health Indices to Iodine and Beta-Carotene Concentrations in Cow's Milk1,2,

L. L. Larson3, S. E. Wallen4, F. G. Owen3 and S. R. Lowry5

University of Nebraska, Lincoln 68583

ABSTRACT

Milk samples were collected from 82 Holstein cows during the 1st yr of a 2-yr study and from 44 of these again in the 2nd yr to determine relationships of iodine and beta-carotene concentrations in milk to age, season, placental retention, uterine infections, clinical mastitis, services per conception, and milk yield. Composite milk samples were collected twice weekly at the morning milking. Milk samples from each cow were pooled prior to analyses for the following three times: 1 to 7 wk and 8 to 14 wk postpartum in yr 1 and 1 to 6 wk postpartum in yr 2.

Beta-carotene concentrations of milk were inversely related to milk yield and positively related to milk fat percentage. Concentrations tended to be higher for cows experiencing health problems, probably because of lower milk yields and the concommitent higher milk fat content. The relatively low milk iodine concentrations were not generally related to cow age, season of calving, milk yield, milk fat percentage, or to health and performance measures.

FOOTNOTES

1 Published as Paper Number 7030, Journal Series, Nebraska Agricultural Experiment Station.

2 Supported in part by Animal Health Funds (Section 1433, PL 95-113). A contribution of the regional research project NC-113. Methods for Improvement of Fertility in Cows Postpartum.

3 Department of Animal Science.

4 Department of Food Science and Technology.

5 Biometrics and Information Systems Center.






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Copyright © 1983 by the American Dairy Science Association ®.