Studies at the Iowa Experiment Station during 1927 and 1928 indicate very clearly that selection is effective in increasing resistance to this disease

Knox, C. W.

Lambert, W. V.

English

Name not available

On the Inheritance of Resistance to Fowl Typhoid in Chickens

University of Northern Iowa

Proceedings of the Iowa Academy of Science Volume 36 Annual Issue Article 120 1929 On the Inheritance of Resistance to Fowl Typhoid in Chickens W. V. Lambert Iowa State College C. W. Knox Iowa State College Copyright ©1929 Iowa Academy of Science, Inc. Follow this and additional works at: https://scholarworks.uni.edu/pias Recommended Citation Lambert, W. V. and Knox, C. W. (1929) "On the Inheritance of Resistance to Fowl Typhoid in Chickens," Proceedings of the Iowa Academy of Science, 36(1), 382-383. Available at: https://scholarworks.uni.edu/pias/vol36/iss1/120 This Research is brought to you for free and open access by the Iowa Academy of Science at UNI ScholarWorks. It has been accepted for inclusion in Proceedings of the Iowa Academy of Science by an authorized editor of UNI ScholarWorks. For more information, please contact scholarworks@uni.edu. 382 row A ACADEMY OF SCIENCE until 1890 when Eugene Scheiffiin is credited with having released eighty of the birds in Central park, N. Y. City, that a successful introduction was made. l;nlike the attempts that failed, the lot thrived in the new land, and in 1891 forty more were imported. By 1902 it seemed that the Starling had gained a foothold in the United States and had extended its range outside of greater New York; and by 1916 was found in many of the neighboring states. The increase in number and spread of the species has been rapid since 1920. A flock of these bi,rds was seen as far west as Urbana, Ill., in 1922, and two specimens were collected near JVIilwaukee, vVis., in 1923. The first published record of the Starling in Iowa came when W. S. Long reported (Auk, vol. XLV, 101) seeing a Starling at Lamoni, Decatur Co., Iowa in Dec. 1922. On Mar. 23, 1929 three specimens were collected by the writer near Oxford, Johnson Co., Iowa, a flock of about a do.zen having spent several weeks in a grassy gully at this place. These specimens, the first of the' species to have been collected in Iowa, are now in the Bert Heald Bailey Museum of Coe· College. The New Hampton Tribune of Apr. 10, 1929 prints the report of one of the birds being taken in a sparrow trap during the first week in April. If the experience of other states holds true here, the Starling may be expected to become a pest within a £ew years. CoE COLLEGE, CEDAR RAPIDS, low A. ON THE INHERITANCE OF RESISTANCE TO FOWL TYPHOID IX CHIC:f(ENS W. v. LAMBERT AND C. \V. KNOX Studies at the Iowa Experiment Station during 1927 and 1928 indicate very clearly that selection is effective in increasing re-sistance to this disease. Following intraperitoneal inoculation with a standard dose of virulent fowl typhoid bacteria, a total of 1,051 chicks ( 7 days old), from parents that had both survived an acute infection of fowl typhoid, gave a mortality of 39.5 per cent. The mortality in a group of 1,084 chicks from parents that had never been subjected to an infection with this disease was 89.2 per cent. The percentage mortality in a group of 537 chicks, where the male alone was the surviving parent, was 67.2. In a lot of 57 chicks the 1Lambert and Knox: On the Inheritance of Resistance to Fowl Typhoid in ChickensPublished by UNI ScholarWorks, 1929ZOOLOGY ABSTRACTS 383 dams of which alone were the survivors the mortality was 61.4 per cent. The last two groups indicate that the male is as effective as the female in transmitting resistance to the progeny, as well as to show that a transfer of passive immunity is not responsible for the greater resistance of the chicks from the surviving parents. The speed of mortality in the different lots corresponded in gen-eral with total mortality, indicating that the chicks from parents that have survived an infection of fowl typhoid possess in general a higher potential of resistance than do chicks from parents that have not survived an epidemic of this disease. IowA STATE COLLEGE, AMES, IowA. THE SEX RATIO IN GUINEA PIGS R. G. SCHOTT The relative proportions of the sexes appearing in a total of 2,014 guinea pigs in the colony of the Department of Genetics, Iowa State College, over a six-year period have been studied. The ratio of males for the 2,014 animals was 49.4%. This is a close approach to the expected 50 :50 relationship of the sexes as postu-lated by the sex-chromosome mechanism. Considerable seasonal fluctuation in the ratios were observed, but these are not consistent throughout the period. Age of parents, litter size, and litter se-. quence have no marked effect on the sex ratio. The number of males dead at birth is greater than the number of females. A•hough this finding is consistent with previous ob-servations among mammals, the difference here is not large enough to be considered significant. The death rate from birth to thirty days changes in favor of male viability, but the differences are not sufficiently great to be significant. IowA STATE COLLEGE, AMES, IowA. THE INHERITANCE OF LEG-FEATHERING IN THE CHICKEN w. v. LAMBERT AND C. W. KNOX The inheritance of leg-feathering in crosses of the Black Lang-shan (feathered) with the White Plymouth Rock and Buff Or-2Proceedings of the Iowa Academy of Science, Vol. 36 [1929], No. 1, Art. 120https://scholarworks.uni.edu/pias/vol36/iss1/120

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On the Inheritance of Resistance to Fowl Typhoid in Chickens

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