Some factors affecting the progency testing of rams
By: by Ralph W. Phillips ... [et al.].
Series: Circular / United States Department of Agriculture -- no. 580; Circular (United States. Dept. of Agriculture) -- no. 580.
Publisher: U.S. Dept. of Agriculture
Published: 1940
Place of publication: Washington, D.C
Language: eng
Number of pages: 18
Subjects: Breeding; Rams
Notes: Caption title.

"Contribution from Bureau of Animal Industry."

Bibliography: p. 17.