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Journal of Dairy Science Vol. 56 No. 2 212-217
© 1973 by American Dairy Science Association ®
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Performance and Milk Zinc from Low-zinc Intake in Holstein Cows1

M. W. Neathery, W. J. Miller, D. M. Blackmon and R. P. Gentry

Departments of Dairy Science and Medicine and Surgery, University of Georgia, Athens 30601

ABSTRACT

Following a 1-week standardization period, a high beet pulp, low-zinc diet (16.6 parts per million) was fed with (39.5 parts per million total zinc) and without supplemental zinc as zinc oxide to 10 first-lactation Holstein cows (linearly declining phase of lactation) for 6 weeks. The low-zinc diet did not adversely affect milk production, fat-corrected milk, solids-corrected milk, milk fat, solids-not-fat, protein, feed intake, or body weight changes, indicating that zinc intake was adequate for these functions. However, with the low-zinc diet zinc content of milk was reduced 23% and percentage of ingested zinc in milk doubled. Thus, major adjustments to the diet were reduction in milk zinc and more efficient translocation of dietary zinc to milk zinc.

Milk zinc content of a cow was highly repeatable (correlation coefficient = .92) from one measurement period to another, indicating that factors affecting milk zinc can be investigated more efficiently if standardization period data are used in covariance analyses. The correlation coefficient between milk zinc content and milk protein content was .65 and between milk zinc and milk production — .33.

FOOTNOTES

1 This study was supported in part by Public Health Service Research Grant AM 07367-NTN from the National Institute of Arthritis and Metabolic Diseases.






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Copyright © 1973 by the American Dairy Science Association ®.