| Autor: |
L.A. Moore, K.L. Dolge, Cecilia M. Dembiczak, J.E. Rousseau, Geoffrey Beall, H.D. Eaton |
| Rok vydání: |
1954 |
| Předmět: |
|
| Zdroj: |
Journal of Dairy Science. 37:1376-1382 |
| ISSN: |
0022-0302 |
| DOI: |
10.3168/jds.s0022-0302(54)91416-2 |
| Popis: |
Summary Data on blood plasma vitamin A and liver vitamin A concentrations from 58 Guernsey and Holstein calves fed a vitamin A depletion ration and whose average age and body weight was 128±19 days and 263±72lb., respectively, and from 39 Holstein calves fed minimum levels of vitamin A or carotene and whose average age and body weight were, respectively, 200±9 days and 436±48lb. were explored as to possible relationship. When plasma vitamin A and liver vitamin A were expressed as logarithms, a positive linear relationship was found between these two variables. In calves fed the vitamin A depletion ration, the blood plasma vitamin A level was found to be less at a given concentration of vitamin A in the liver than in the calves fed minimum levels of vitamin A or carotene. Positive linear relationships of log liver vitamin A concentration on log plasma vitamin A concentration were derived for purposes of estimating liver stores of vitamin A in calves fed the vitamin A depletion ration and in calves fed minimum levels of vitamin A or carotene. These had applicable limits for prediction of approximately 3.6 and 25.8γ of vitamin A per 100ml. of blood plasma. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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