4Th Annual Convention December 13 to 15, 1971

o v t t t c

OFFICIAL JOURNAL OF THE AMERICAN ASSOCIATION OF BOVINE PRACTITIONERS

November, 1971

4th.. Annual Convention AMERICAN ASSOCIATION OF BOVINE PRACTITIONERS DENVER HILTON HOTEL • DENVER, COLORADOgg December 13 to 15, 1971 PRACTITIONER

IIM THIS ISSUE

A Rational Basis for The Prevention of Parturient Paresis...... 2 Evaluation of Frozen Bovine Semen ...... 12 Reproductive Soundness in Beef Bulls ...... 20 No Efficiency of Currently Used Anthelmintics in Bovine P ra c tic e ...... 26 Transport of Passive Immunity to the C a lf ...... 34 A Review of the Comparative Efficacy of Sulfonamides in Cattle and Economics of Their Use ...... 40 Some Current Research on the Emphysema-Adenomatosis Complex of C a ttle ...... 48 Serologic Testing in the Diagnosis of Virus Diseases of C a ttle ...... 50 The Role of the Feedlot Veterinarian...... 53 Practice T ip s ...... 55 4th Annual Convention: American Association of Bovine Practitioners...... 56 AABP O ffic e rs ...... 66 A VM A Delegate's Report ...... 68 V II International Congress on CattleDiseases...... 75

FORTHCOMING A.A.B.P. MEETINGS

1972 Chicago Area, December 10-12. 1973 Fort Worth, Texas, December 9-11.

The Bovine Practitioner is published by the American Association of Bovine Practitioners, Inc., at Heritage Press, Stillwater, Oklahoma 74074 (Phone 405-377-3393). Over 7000 copies are mailed to veterinarians engaged in cattle practice and allied institutions. Send new address (please include old address) to: Dr. Harold Amstutz Sec.-Treas., AABP Box 2319 W. Lafayette, Indiana 47906 The Post Office will not forward the journal. Controlled Circulation paid at Stillwater, Oklahoma.

The Cover Photo is the Denver Civic Center at night. The classically-styled City and County Building is the scene each holiday season of one o f the nation's outstanding Christmas lighting displays. V ovute

EDITOR: Eric I. Williams, F.R.C.V.S., M S. Department of Medicine and Surgery College of Veterinary Medicine Oklahoma State University Stillwater, Oklahoma

ADVERTISING MANAGER: Irwin J. Collinge, D.V.f Ernporia, Kansas 71

OFFICERS: P resident...... Irwin J. Collinge, D.V.M., Emporia, Kansas President-Elect . . .Francis H. Fox, D.V.M., Ithaca, New York Vice-President . . . Ben D. Harrington, D.V.M., Raleigh, N.C. Past-President . Herbert L. Marsh, D.V.M., Princeton, Illinois Sec.-Treas. . . Harold E. Amstutz, D.V.M.; Lafayette, Indiana

AMERICAN ASSOCIATION OF BOVINE PRACTITIONERS

BOARD OF DIRECTORS: SAMUEL HUTCHINS, III, D.V.M ...... South Barre, Vermont 1st D istrict, 1972 ARTHUR V. BARTENSLAGER, D.V.M. .. Churchville, Virginia 2nd District, 1973 JAMES A. JARRETT, D .V.M ...... Rome, Georgia 3rd District, 1971 VERNON L. THARP, D.V.M ...... Columbus, Ohio 4th District, 1972 LELAND C. ALLENSTEIN, D.V.M ...... Whitewater, Wisconsin 5th District, 1973 ALPHONSE J. KUNKEL, D.V.M ...... St. Michael, Minnesota 6th District, 1971 ROBERT B. M ILLER, D .V.M ...... Warrensburg, Missouri 7th District, 1972 HORACE T. BARRON, D.V.M ...... College Station, Texas 8th District, 1973 LEO M. CROPSEY, D .V.M ...... Denver, Colorado 9th D istrict, 1971 ROBERT J. HARRIS, D.V.M ...... Turlock, California 10th District, 1972 FRANK K. BRACKEN, D.V.M ...... Pullman, Washington 11th District, 1973 REPRESENTATIVES TO AVMA HOUSE OF DELEGATES Maurice L. Weldy, D.V.M.; Wakarusa, Indiana Harold E. Amstutz, D.V.M.; (Alternate)