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The Progeny Test as a Method of Evaluating the Dairy Sire.

  • Joseph Edwards (a1)
Abstract

A survey of some environmental and physiological factors influencing milk yield and an analysis of theories of and experiments on milk and butterfat inheritance have been made.

Further evidence is given of the fact that the proved dairy sire is the outstanding medium through which improvement in dairy cattle breeding may be effected. The need of (1) prolonging the breeding life of such an animal and (2) evolving a scheme for the regular progeny-recording of all dairy sires is emphasised.

The minimum number of unselected daughters necessary to give a reasonably accurate indication of their sire's transmitting ability is six.

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(4) W. E. Castle Inheritance of quantity and quality of milk production in dairy cattle. Proc. Nat. Acad. Sci. (1919), 5, 428.

(13) W. Gifford and E. C. Elting The effect of the ages of sire and dam on the average butterfat production of the offspring in dairy cattle. Dairy Sci. (1928), 11.

(14) H. D. Goodale A sire's breeding index with special reference to milk production. Amer. Nat. (1927), No. 671, p. 539.

(34) H. G. Sanders The variation in milk yield caused by the season of the year, service, age and dry period, and their elimination. J. Agric. Sci. (1927), 17, 339, 502; 18, 46, 209.

(42) Chr Wriedt . The inheritance of butterfat percentage in crosses of Jerseys with Red Danes. J. Genetics (1930), 22, 45.

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The Journal of Agricultural Science
  • ISSN: 0021-8596
  • EISSN: 1469-5146
  • URL: /core/journals/journal-of-agricultural-science
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