Factors affecting calcium phosphorus, and magnesium status of dairy cattle on the Oregon Coast

Blood plasma from 126 milking cows in 21 herds was analyzed for calcium, phosphorus, and magnesium in October, 1974, and in the following April. For all three minerals, time of sampling, herds, and time of sampling by herd differed. Mean values in October and April were calcium, 10.1 and 9.0; phosph...

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Bibliographic Details
Published in:Journal of dairy science 1976-11, Vol.59 (11), p.2005-2007
Main Author: Claypool, D.W
Format: Article
Language:English
Subjects:
Animal Feed
Animals
Calcium - blood
Cattle - blood
Female
Lactation
Magnesium - blood
Medicago sativa
Oregon
Phosphorus - blood
Pregnancy
Seasons
Silage
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Summary:Blood plasma from 126 milking cows in 21 herds was analyzed for calcium, phosphorus, and magnesium in October, 1974, and in the following April. For all three minerals, time of sampling, herds, and time of sampling by herd differed. Mean values in October and April were calcium, 10.1 and 9.0; phosphorus, 5.96 and 4.88; magnesium, 1.98 and 1.85 mg/100 ml. Calcium also differed between stages of lactation. Mean calcium for cows milking less than 100 days, 101 to 200 days, and greater than 200 days and dry was: 9.41, 9.70, and 9.80 mg/100 ml. Differences in winter feeding practices among herds were responsible for time of sampling, herd, and time of sampling-by-herd differences.
ISSN:0022-0302
1525-3198
DOI:10.3168/jds.S0022-0302(76)84475-X