Experiment Station Record, Volume 92, January-June, 1945 Page: 35
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19451 GENETICS 35
the breed average. For unproved bulls, 1 ct. is added for each percentage point
above the breed average production of the daughters and I ct., per point for each
percentage that the progeny of the grandparents exceed the breed average for age
Effects of an unfractionated pituitary extract upon cystic ovaries and nymphomania
in cows, L. E. CASIDA, W. H, MCSHAN, and R. K. MEYER. (Wis. Expt.
Sta.). (Jour. Anitm. Sci.; 3 (1944), No. 3, pp. 273-282).-Intravenous injections
of unfractionated sheep pituitary were administered to 96 cows with cystic ovaries,
some of which showed nymphomania. The symptoms of nymphomania disappeared
after one injection in 72 of 81 cows, but the symptoms recurred in 14, of which 6
showed uterine or tubal pathology. Manual palpation indicated that corpora lutea
were formed in 74 of the 96 cows within 31 days after treatment. The single
injection caused normal estrus in 69 of the cows. Pregnancies were found in.36
of the 53 normal animals bred, but no pregnancies occurred among 6 of the 12
animals bred showing abnormalities of the genital tract. Retreatment of 16 of the
cows in which the cysts persisted after the first injection or recurred resulted in 6
pregnancies in animals with normal genital tracts. No pregnancies resulted from
third injections to 3 animals.
A controlled experiment in feeding wheat germ oil as a supplement to the
normal ration of bulls used for artificial insemination, G. W. SALISBURY.
(Cornell Univ.). (Jour. Dairy Sci., 27 (1944), No. 7, pp. 551-562).-In a group
of 20 bulls fed a regular ration over nearly a year, supplementing the ration of
one-half of the bulls with.1 oz. of wheat-germ oil daily did not increase the fertility
or sperm viability as contrasted with the other half, which received no wheat-germ
oil. Data were recorded on the semen characteristics of thebulls and their breeding
behavior during the 3-mo. period before wheat-germ oil feeding and also while
being fed the wheat-germ oil. The time that the bulls required for mating, from
their approach to the "teaser" cow until the ejaculation, volume of ejaculate, number
and motility of sperm, concentration of semen, and conceptions among the 3,681
artificial services of the wheat-germ-oil-fed bulls and the 4,565 services of the
control bulls were recorded. The wheat-germ oil feeding did not prevent 2 bulls
from decreasing in fertility to such low. levels that they were withdrawn from use
in artificial insemination. There was a highly significant decrease in the percentage
of motile sperm during the early spring months and highly significant monthly differences
in sperm counts, but no significant monthly differences in fertility were
noted. Semen was collected from each bull approximately once each week.
The uterine wall of the cow, H. E. KINGMAN (Amer. Jour. Vet. Res., 5 (1944),
No. 16, pp. 223-227, illus. 2).-The uterine wall of the cow is described, and the
changes which occur in the ovary and uterus at different stages of the reproductive
cycle as a result of the action,of different hormones are diagramed.
A staining method for the differentiation of live and dead spermatozoa.-I,
Applicability to the staining of ram spermatozoa, J. F. LASLEY, G. T. EASLEY,
and F. F. MCKENZIE. (Coop. U. S. D. A.). (Missouri Sta. Cir. 292 (1944),
pp. 8, illus. 1).-A reprint of the article previously noted (E. S. R., 87, p. 500).
Hereditary and environmental factors affecting growth rate in swine, A. W.
NORDSKOG, R. E. COMSTOCK, and L. M. WINTERS. (Minn. Expt. Sta. and
U. S. D. A.). (Jour. Anim. Sci., 3 (1944), No. 3, pp. 257-272, illus. 2).--The
factors of heredity atid environment affecting the growth curve of swine were
analyzed by variance and offspring dam regression technics. The data involved
weights at specific ages from birth to 168 days and gains at intervals between these
ages, as well as the average gains per day calculated both from birth and weaning
to 200 lb. live weight. The average rate of gain per day totaled 1.53 lb. for the
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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.. (digital.library.unt.edu/ark:/67531/metadc5064/m1/48/?rotate=90: accessed August 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.