Experiment Station Record, Volume 74, January-June, 1936 Page: 838
xx, 1029 p. ; 24 cm.View a full description of this book.
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838 EXPERIMENT STATION RECORD [Vol. 74
calcium and of removing vitamin supplements, L. S. PALMER, C. P. FITCH,
T. W. GULLICKSON, and W. L. BOYD (Cornell Vet., 25 (1935), No. 3, pp. 229-246,
fig. 1).-Continuing this study (E. S. R., 69, p. 258) at the Minnesota Experiment
Station, certain of the low calcium cows were continued through one or
two further gestations on essentially the same type of ration but reproportioned
so that the calcium plane was only about 0.12 percent of the dry
matter instead of 0.18 percent. In addition representative animals from each
of the groups in the previous study were continued through one or two gestations
with the cod-liver oil and tomatoes omitted from their ration.
Three cows that had reproduced normally during 3 yr. on a ration containing
an average of 0.18 percent calcium exhibited no abortions attributable
to the ration when the calcium content was reduced to 0.12 percent during
one or two succeeding gestations. The ration appeared to have no effect on
milk and butterfat production or on the chemical composition and clotting
properties of the milk, but did result in a slight but definite decline in total
and ultrafiltrable calcium in the blood plasma. The mineral content of the
muscles of these animals was normal, but the bones had a lower calcium
phosphate and calcium carbonate content.
The removal of the cod-liver oil and tomatoes had no effect on breeding
efficiency during this trial. The cows seemed to become slightly more susceptible
to infections affecting reproduction, but this fact was not conclusively
demonstrated. The milk and butterfat production and the chemical composition
and clotting properties of the milk was unaffected by the change in ration.
A slight but definite decline in the total calcium of the blood plasma occurred,
and all groups showed a large decline in ultrafiltrable calcium. The muscle
tissues of these cattle showed a normal mineral content, and with the exception
of a slightly lower ash and calcium carbonate content, the bones of
the cattle showed no effects resulting from the withdrawal of the vitamin
supplements.
Feeding the dairy herd, W. B. NEVENS (Illinois Sta. Circ. 440 (19'35), pp. 52,
figs. 15).-This is a revised and enlarged edition of Circular 372, previously
noted (E. S. R., 65, p. 561).
A comparison of the feeding-values of grass ensiled by the A. I. V.process
and a ration containing mangolds and hay, J. B. E. PATTERSON
(Empire Jour. Expt. Agr., 3 (1935), No. 10, pp. 144-152, fig. 1).-This study was
undertaken to determine the effect of replacing mangolds and part of the hay
in a ration with A. I. V. fodder on the quantity and quality of the milk produced
and on the animals themselves. Mature aftermath grass was ensiled by
the A. I. V. process.
Chemical analyses of the fresh grass and A. I. V. fodder showed that little
change occurred in the protein content, but that the phosphoric acid and calcium
content of the silage was lower. When 40 lb. of A. I. V. fodder replaced
40 lb. of mangolds and 5 lb. of hay, the milk production decreased 1.2 lb. per
cow per week. The average percentage of butterfat was slightly but not
significantly higher, and the color of the butterfat was more than doubled by
feeding the A. I. V. fodder. The live weights of the cows fell during the control
periods and rose to slightly above the initial weights during A. I. V. feeding.
A combination of fish and kelp meals for the dairy ration, C. F. MONROE,
M. A. BACHTELL, and C. C. HAYDEN (Ohio Sta. Bimo. Bul. 178 (1936), pp.
18-20).-In order to obtain a further check on the value of Manamar (E. S. R.,
73, p. 672), the dairy herd at the Trumbull County Experiment Farm was
divided into two groups. One group received the regular grain ration, while
the other group was fed the same mixture with part of the cottonseed meal
replaced by whitefish meal and kelp. The latter feeds made up 5 and 3
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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/m1/858/: accessed July 15, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.