Experiment Station Record, Volume 74, January-June, 1936 Page: 839
xx, 1029 p. ; 24 cm.View a full description of this book.
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1936] DAIRY FARMING-DAIRYING 839
percent, respectively, of the mixture. Both groups received corn silage and
alfalfa hay and were on pasture during the grazing season. The rations
were fed continuously for approximately 3 yr. and at the end of this period
the groups were changed to the opposite rations at their next freshening.
There was no significant difference in the production on the two rations.
The total feed consumption, the feed requirements per 100 lb. of 4 percent milk,
and the butterfat test were practically equal on both rations. In general, the
health history of the cows on the check ration was satisfactory but not perfect.
Since the difficulties on the check group were duplicated on the fish meal and
kelp ration, it is concluded that the combination was not an absolute preventive
of abortions, retained placenta, milk fever, and garget, and that it did not
increase breeding efficiency.
Methods of inspecting milk at the receiving platform, J. L. HILEMAN
(Milk Dealer, 25 (1935), No. 2, pp. 30, 31, 64, 66, figs. 2).-In this article the
author discusses the system of receiving-platform inspection of milk developed
by the Dairymen's League Cooperative Association.
Investigation of resazurin as an indicator of the sanitary condition of
milk, G. A. RAMSDELL, W. T. JOHNSON, JR., and F. R. EvANS (Jour. Dairy Sci.,
18 (1935), No. 11, pp. 705-717, figs. 2).-The U. S. D. A. Bureau of Dairy Industry
reports the results of 2 years' study on the use of resazurin, a chemical
indicator for determining the sanitary condition of milk.
It was found that only 1 hr. was required to complete the resazurin test
as described, while the methylene blue test required over 5 hr. On the basis
of this test milk can be classified into four groups as regards sanitary condition.
Milks from diseased udders and from physiologically abnormal cows
have significant effects on the reduction of this indicator, and hence the test
aids in their detection. By -observing the rate of color change in resazurinmilk
mixtures over a period of hours of incubation, much information as to
the kind and character of the flora may be obtained.
Nutritional factors of S[treptococcus] lactis, C. S. MUvDGE and F. R. SMITH
(Soc. Expt. Biol. and Med. Proc., 32 (1935), No. 5, pp. 672-674, fig. 1).-Using
a trilinear chart, the California Experiment Station made a study of the effect
of variations in nutrient solutions on the growth of S. lactis. The variables
tested were peptone, yeast extract, and water. A total of 21 solutions was
prepared and adjusted electrometrically to pH 6.5. The media were inoculated
with a 0.1 cc of an 18-hour-old milk culture of S. lactis, and after 24 hours'
incubation at 30 C. the growth was recorded.
From the growth of the organism it was evident that peptone supplied
something which was not supplied by water. When a Sorensen citrate buffer
of pH 6.5 diluted 1 to 10 was substituted for the peptone, similar growth was
obtained. To eliminate the possibilities of the citrate as a source of carbon
a N/I00 NaH Co, solution was used in its place, and again similar growth
was obtained. On this basis it is concluded that for S. lactis, at least, the
peptone in a media serves largely, if not entirely, as a buffer.
The relation of mastitis to rennet coagulability and curd strength of
milk, H. H. SOMMER and H. MATSEN (Jour. Dairy Sci., 18 (1935), No. 11, pp.
741-749, figs. 2).-This study at the Wisconsin Experiment Station was undertaken
to determine the relation of mastitis to the rennet coagulability and curd
strength of milk.
Subclinical mastitis caused the milk to have a lower curd strength and to
coagulate more slowly than rennet. This result was obtained when entire
milkings from normal and infected udders were compared and when samples
from infected quarters were compared with milk from uninfected quarters
of the same udder. Corroboration of this finding was also furnished by the
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General Index to Experiment Station Record, Volumes 71 to 80, 1934-1939 (Book)
A topical, alphabetically arranged index to volumes 71-80 including experiment station records, publications reviewed, and foreign publications. In has a list of all editorial notes from the referenced volumes.
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United States. Office of Experiment Stations. Experiment Station Record, Volume 74, January-June, 1936, book, 1937; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc5082/m1/859/: accessed July 15, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.