Experiment Station Record, Volume 92, January-June, 1945 Page: 38
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38 EXPERIMENT STATION RECORD [Vol. 92
increase of 56 percent over the percentage previously reported (E. S. R., 71, p.
458) as the proportion exhibiting all five of the desired characters-early maturity,
high winter intensity, nonpause, nonbroodiness, and high persistency. Among the
birds hatched during 1928-32, only 16 percent showed all five of the preferred
characters, but this proportion was increased to 25 percent among those hatched in
1938-42. In this group, 36 percent showed four of the desired characters. The
average egg production with the five desired characters was 251.6, and with four
characters, 223.89. The restricted size of the flock and the complex mode of inheritance
slowed the progress in combining all five characters.
Relation of intensity to egg weight and egg production, F. A. HAYS (Mass.
Sta. Bul. 416 (1944), pp. 12).--A statistical analysis of egg production records of
1,470 pedigreed Rhode Island Red females bred for high fecundity and hatched
from 1937 to 1942 furnished evidence that winter clutch size was one of the more
reliable measures of intensity and that it was one of the most important characters
associated with egg production. This conclusion was derived from the following
findings: "Age at first egg showed very little correlation with egg weight during
March, either in an extremely early maturing group or in a medium early maturing
group. There was a small but significant negative correlation between age at first
egg and mean winter clutch size. Winter clutch size (to March 1) showed a small
but significant negative correlation with egg weight to January 1, and a moderate
negative correlation with March egg weight, but no correlation with annual egg
weight. There was a negative correlation between winter egg production (to
March 1) and winter egg weight (to January 1), and a small negative correlation
between winter egg production and March egg weight; but winter egg production
and annual egg weight were independent of each other. The use of the correlation
ratio showed that annual egg weight was positively correlated with annual egg
production. Winter egg production showed a significant positive correlation with
egg production for the remainder of the year. Winter clutch size was intimately
correlated with annual production. There was some evidence of inheritance of
winter clutch size between mothers and daughters. Winter clutch size was significantly
greater in broody than in nonbroody individuals. Winter clutch size was
significantly correlated with spring, summer, and fall clutch size."
Macro- and microscopic methods of detecting fertility in unincubated hen's
eggs, I. L. KOSIN (Poultry Sci., 23 (1944), No. 4, pp. 266-269, illus. 4).-Tle
separation of fertile and infertile unincubated hen's eggs for experimental purposes
is possible by dissection after the yolk is freed of albumin and hardened 24
hr. in formaldehyde. The yolk is stained with a very little alum cochineal after
removing the vitelline membrane over the germ disk. Lacunae were present in the
blastodisk of infertile eggs which were apparent macroscopically and more clearly
observed in microscopic preparation.
Fertility and hatchability when the environmental temperature of chickens is
high, B. W. HEYWANG. (U. S. D. A.). (Poultry Sci., 23 (1944), No. 4, pp.
334-339).-Analyses and' determinations made by the statistic p according to the
methods of Hendricks (E. S. R., 74, p. 684) for the fertility and hatchability of
the eggs laid by 108 White-Leghorn pullets kept under various environmental temperatures
showed that they were significantly lower for eggs laid at the maximlln
temperatures averaging 1,01.8 to 106.8 F. than those of eggs laid at average maximum
temperatures of 82.8, 86.2, and 93. Thus high environmental temperatures
are inimical to hatchability.
Some aspects of the biological action of X-rays on cock spermatozoa, I. L.
KOSIN (Physiol. Zool., 17 (1944), No. 3, pp. 289-319, illus. 8).-The soft type of
X-ray irradiation adversely affected the fertilizing capacity of cock spermatozoa
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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/m1/51/: accessed April 27, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.