A comparative study of diagnostic tests for the assessment of herd magnesium status in cattle
作者:
R.J. Sutherland,
K.C. Bell,
K.D. McSporran,
G.W. Carthew,
期刊:
New Zealand Veterinary Journal
(Taylor Available online 1986)
卷期:
Volume 34,
issue 8
页码: 133-135
ISSN:0048-0169
年代: 1986
DOI:10.1080/00480169.1986.35323
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
In nine of ten pre-calving dairy herds we found that herd magnesium (Mg) status could be determined with 95% confidence by measurements of serum Mg (S-Mg), urinary Mg fractional clearance ratio (FCR) or creatinine corrected urinary Mg concentration (CUM) from 10 representative cows. Our findings support clinical impressions that FCR and CUM are more sensitive than S-Mg as predictors of a positive production response to Mg supplementation of dairy cows. The available clinical data is not adequately controlled and there is a need for controlled production-response trials to refine interpretation and to confirm the predictive value of these tests. Pending such trials we suggest that mean FCR <10% or CUM <1.0 mmol/ℓ indicate that a positive response is likely.
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