scholarly journals The Stability of Vitamin A in Mixed Feeds and Premixes

1955 ◽  
Vol 34 (3) ◽  
pp. 603-608 ◽  
Author(s):  
B.L. Reid ◽  
H.K. Daugherty ◽  
J.R. Couch
Keyword(s):  
Vitamin A ◽  
The Stability ◽  
Mixed Feeds

scholarly journals The Stability of Vitamin A from Cod Liver Oil in Mixed Feeds

1939 ◽  
Vol 18 (5) ◽  
pp. 345-349 ◽  
Author(s):  
R.C. Holder ◽  
S.K. Ford
Keyword(s):  
Vitamin A ◽  
Cod Liver Oil ◽  
The Stability ◽  
Mixed Feeds

The Use of Large Samples in the Determination of Vitamin A in Mixed Feeds Fortified with Dry Vitamin A Supplements

1960 ◽  
Vol 43 (1) ◽  
pp. 25-28
Author(s):  
F Howard Tinkler ◽  
Joseph B Hanley ◽  
Robert W Lehman
Keyword(s):  
Vitamin A ◽  
Large Samples ◽  
Mixed Feeds

Vitamin A in Mixed Feeds, Premixes, and Foods: Collaborative Study

1974 ◽  
Vol 57 (4) ◽  
pp. 903-909
Author(s):  
Donald B Parrish
Keyword(s):  
Standard Deviation ◽  
Vitamin A ◽  
Collaborative Study ◽  
Carotenoid Pigments ◽  
Feed Supplement ◽  
Mixed Feed ◽  
Breakfast Cereal ◽  
Liquid Feed ◽  
Transfer Procedures ◽  
Mixed Feeds

Abstract The official final action method for determining vitamin A in mixed feeds, 39.008–39.013, was simplified where possible, principally in extraction and transfer procedures and by omission of chromatography, and was modified to apply to a larger variety of feed and food products. Twenty-two analysts of various degrees of experience participated in the collaborative study of the method, using 6 products. After outliers were eliminated by the Dixon test, data were analyzed and averages were compared with amounts of vitamin A known to be, or estimated, in each sample. The average, per cent deviation from added amount, standard deviation, and coefficient of variation, respectively, on each sample were: breakfast cereal (Sample 1), 23.8 μg/g, 2% less, 3.08, 13% ; mixed feed (or premix), 12.6 μg/g, 5% less, 0.99, 8%; mixed feed containing carotenoid pigments (Sample 3 ), 4.5 μg/g, 3% more, 0.66, 15%; mixed feed without pigments, 4.5 μg/g, 3% more, 0.57, 13% ; liquid feed supplement, 11.4 μg/g, 9% less, 1.44, 12%; powdered breakfast drink, 19.6, 7% less, 1.91, 10%. Some analysts did not correct for pigments in Samples 1 and 3, or for losses on analysis, which could account in part for the degree of variation and for the lower values on some samples. The method has been adopted as official first action to replace 39.008-39.013.

Report on Vitamin A in Mixed Feeds

1957 ◽  
Vol 40 (3) ◽  
pp. 865-876
Author(s):  
D B Parrish
Keyword(s):  
Vitamin A ◽  
Mixed Feeds

Report on Vitamin A in Mixed Feeds

1959 ◽  
Vol 42 (3) ◽  
pp. 520-524
Author(s):  
D B Parrish
Keyword(s):  
Vitamin A ◽  
Mixed Feeds

Chromatographic Estimation of Vitamin A in Mixed Feeds

1945 ◽  
Vol 17 (11) ◽  
pp. 689-692 ◽  
Author(s):  
Maxwell L. Cooley ◽  
James B. Christiansen ◽  
Carl H. Schroeder
Keyword(s):  
Vitamin A ◽  
Mixed Feeds
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