Experiment Station Record, Volume 92, January-June, 1945 Page: 143
xiii, 1010 p. ; 24 cm.View a full description of this book.
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19451 FOODS-HUMAN NUTRITION 143
milk produced under controlled conditions by the college herd of Ayrshire, Guernsey,
Holstein, Jersey, and Shorthorn cows. The vitamin contents of the milk were
determined for samples taken just previous to and immediately following pasteurization
by the holding process for 30 min. at 143-145 F.
"The ascorbic acid content of the raw milk ranged from 14.0 mg. to 22.5 mg.
and averaged 19.7 - 0.18 mg. per liter; after pasteurization in stainless steel equipment,
the extreme values were 7.0 mg. and 19.1 mg., with an average value of
15.9 2.7 mg. per liter.
"The riboflavin content of the raw milk varied from 1.35 mg. to 1.75 mg. and
averaged 1.51 0.09 mg. per liter. 'The corresponding riboflavin values for the
pasteurized milk were 1.19, 2.06, and 1.48 0.01 mg. per liter, respectively.
"The thiamine content of the raw milk varied from 0.29 to 0.35 mg. and averaged
0.33 0.02 mg. per liter. Corresponding thiamine values for the pasteurized milk
were 0.21, 0.34, and 0.30 0.03 mg., respectively.
"The raw milk contained 4.6 0.3 times as much riboflavin as thiamine, 13.1
1.43 times as much ascorbic acid as riboflavin, and 59.8 6.40 times as much
ascorbic acid as thiamine. On the average, the pasteurized milk contained 4.9
0.81 times as much riboflavin as thiamine, 11.0' - 1.93 times as much ascorbic acid
as riboflavin, and 53.8 9.63 times as much ascorbic acid as thiamine."
Uniformity of riboflavin content of milk produced under standardized conditions,
A. D. and J. O. HOLMES. (Mass. Expt. Sta.). (Amer. four. Diseases
Children, 66 (1943), No. 6, pp. 607-610).--The results of the riboflavin assays of
80 lots of 800 qt. of milk are reported. The milk was produced by a normal
healthy mixed herd (Ayrshire, Guernsey, Holstein, Jersey, Shorthorn) maintained
under modern dairy conditions on a winter ration composed of hay, corn silage,
grass silage, beet pulp, mangels (December only), and grain. The samples of
milk, collected for analysis after 1 mo. on the winter ration, were obtained during
December, January, February, and March 'and represented mixed morning and
afternoon milks, handled from milking through analysis in a manner to exclude
light. The riboflavin content, determined fluorometrically, averaged in milligrams
per liter 1.45, 1.50, 1.49, and 1.46 in each of the 4 mo., respectively, and 73, 86, 88,
and 94 percent of the samples came within 10 percent of the respective monthly
average. The range of values for the 800 samples was from 1.13 to 1.75. "These
results seem to justify the conclusion that it is possible to standardize the feeding
and management conditions for a dairy herd sufficiently so that milk of relatively
uniform riboflavin content may-be produced for considerable periods of time."
Ascorbic acid, riboflavin, and thiamine content of cow's milk: Influence of
the ration, A. D. HOLMES, C. P. JONES, and A. W. WERTZ. (Mass. Expt. Sta.).
(Amer. Jour. Diseases Children, 67 (1944), No. 5, pp. 376-381).-A review of some
40 references to the literature indicated that investigators were not in agreement
concerning the influence of a'cow's ration on the amount of ascorbic acid, riboflavin,
and thiamine in the milk. A study was made, therefore, of these vitamins in the
milk from a mixed herd of 69 cows (referred to in the above study) maintained
under controlled, standard feeding and management practices. The study was
made as the cows were being transferred from the winter ration of hay, silage,
and ground grain (period 1) to green grass pasture ration (period 2, April 26 to
May 10; period 3, May 11 to June 17). The results of the assays, reported in
detail, showed that the vitamin-values, in milligrams per liter, averaged 20.3, 1.43,
and 0.32 for 'ascorbic acid, riboflavin, and thiamine, respectively, in period 1; with
corresponding values of 19.1, 1.26, and 0.32 in period 2; and 19.5, 1.46, and 0.34
in period 3. The decreased levels of ascorbic acid and riboflavin associated with
the change to green pasture were accompanied by increased milk production, which
decreased again slightly in period 3; the average amount of milk produced daily
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U.S. Department of Agriculture. Agricultural Research Administration. Office of Experiment Stations. Experiment Station Record, Volume 92, January-June, 1945, book, 1947; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc5064/m1/156/: accessed May 7, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.