Experiment Station Record, Volume 74, January-June, 1936 Page: 834
xx, 1029 p. ; 24 cm.View a full description of this book.
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834 EXPERIMENT STATION RECORD [Vol. 74
Of eight mares inseminated a few minutes after the semen was collected
five became pregnant, while two of the five mares inseminated some hours after
the collection conceived. The functional integrity of the spermatozoa of the
stallion appeared to suffer under artificial conditions. The stallions used in
this work varied in the fecundating power of their semen.
Adequacy of simplified rations for the complete life cycle of the chick,
A. G. HOGAN, R. V. BouCHER, and H. L. KEMPSTER (Jour. Nutr., 10 (1935), No. 5,
pp. 535-547, fig. 1).-Continuing these studies (E. S. R., 70, p. 77), four successive
generations of chicks were reared on simplified diets. All of the chicks
grew rapidly and the males were normal in appearance while under observation,
but their fertility was low. The females were normal until they attained
maturity, and their egg records compared favorably with those obtained under
normal conditions. However, after periods of intensive production the mortality
of these hens was high. The authors point out that if data published
by other investigators showing that the low fertility and high mortality were
due to the fact that the birds were reared under laboratory conditions were
correct, then the simplified diets were complete in all respects.
The effects of varying amounts of animal protein fed to White Leghorn
pullets.-I, The influence of low-, medium-, and high-protein diets on the
weight and number of eggs, C. C. RHODES, L. H. BARTEL, and P. E. F. JOOSTE
(Empire Jour. Expt. Agr., 3 (1935), No. 11, pp. 215-228, figs. 8).-In this study
at the Stellenbosch-Elsenburg College of Agriculture, Union of South Africa,
three groups of 20 White Leghorn pullets each were fed mash feeds containing
15.6, 20.3, and 29.1 percent of crude protein, respectively. The same kind and
amount of grain, separator milk, and mineral feeds were available to all lots.
The amount of mash consumed by the groups when self-fed depended on
the protein content of the mashes and on the season. Grain consumption was
fairly constant throughout the year. The differences in milk consumption
were not consistent, but the high-protein group consumed much more than
either the low- or medium-protein group. There was a definite difference
in the protein consumption of the groups, and all fluctuated consistently
during the various months of the year. There was also a definite difference
in the ratio of protein to total carbohydrates consumed, but the birds showed
a decided tendency to balance their rations to a common nutritive ratio.
A progressive difference in numerical production of recorded eggs was noted,
but it was significant only between the low- and high-protein groups. There
was no significant difference in egg size or body weight between the groups.
There was a consistent increase in egg size until August, amounting almost
to a straight line when graphically presented. There appeared to be no relationship
between the amount of protein consumed and the number of eggs
produced from month to month and the size of eggs produced during corresponding
months. The gradual consistent increase in egg size was independent
of environment and feeding but was closely related to increase in body weight
during the first laying year.
The feeding value of corn bran in rations for growing chicks, C. S.
TOLENTINO (Philippine Agr., 24 (1935), No. 5, pp. 413-424, fig. 1).-This study
was divided into three trials in which five lots of 67 chicks each were used.
When supplemented with shrimp meal, corn bran was much better than rice
bran but decidedly inferior to corn meal alone for chicks. Chicks fed corn
bran or corn bran and rice bran grew more slowly than those fed corn meal
or corn meal and rice bran. In rapidity of growth the rations ranked as
follows-corn meal and rice bran, corn meal, corn bran, and corn bran and
rice bran. In weight at 12 weeks of age there was no significant difference
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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/m1/854/: accessed July 15, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.