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Comparative Immunology Microbiology and Infectious Diseases | 1995

Prevalence of group A and group B rotaviruses in the feces of neonatal dairy calves from California

Jarasvech Chinsangaram; Caroline E. Schore; W.M. Guterbock; L.D. Weaver; Bennie I. Osburn

Abstract 136 fecal samples, collected from 47 dairy calves on a calf ranch and in a dairy herd in California, were tested for the presence of group A and group B rotaviruses by reverse transcription-polymerase chain reaction (RT-PCR). Samples were collected from each calf at days 1, 7 and 14. Within the 14 day period, 44 calves (94%) were positive for group A rotavirus and an unexpectedly high number of calves (38 calves, 81%) were positive for group B rotavirus. When these samples were examined by polyacrylamide gel electrophoresis (PAGE), rotavirus was found in 21 calves and all of them had group A electropherotype. Among 25 PAGE positive samples from 21 calves, 17 (68%) were of short electropherotype, 4 (28%) were of long electropherotype and 4 (28%) contained both short and long electropherotype rotaviruses. Group B and short and long electropherotype group A rotaviruses were found in both normal and diarrheic calves.


Journal of Dairy Science | 1989

A Body Condition Scoring Chart for Holstein Dairy Cows

A.J. Edmonson; I.J. Lean; L.D. Weaver; Thomas B. Farver; G. Webster


Journal of Dairy Science | 1991

Change of Milk Yield with Clinical Diseases for a High Producing Dairy Herd

H.A. Deluyker; L.D. Weaver; A.S. Azari


Journal of Dairy Science | 1990

Calculating Selected Reproductive Indices: Recommendations of the American Association of Bovine Practitioners

John Fetrow; David McClary; Robert Harman; Ken Butcher; L.D. Weaver; Erich Studer; James Ehrlich; Wayne Etherington; Walt Guterbock; Donald Klingborg; Jeffrey K. Reneau; N.B. Williamson


Journal of Dairy Science | 1993

Interrelationships of Somatic Cell Count, Mastitis, and Milk Yield in a Low Somatic Cell Count Herd

H.A. Deluyker; L.D. Weaver


Journal of Dairy Science | 1992

Time series cross-correlation analysis of postparturient relationships among serum metabolites and yield variables in Holstein cows.

I.J. Lean; Thomas B. Farver; H.F. Troutt; M.L. Bruss; John C. Galland; R. L. Baldwin; Charles A. Holmberg; L.D. Weaver


Journal of Dairy Science | 1990

Modeling Daily Milk Yield in Holstein Cows Using Time Series Analysis

H.A. Deluyker; Robert H. Shumway; W.E. Wecker; A.S. Azari; L.D. Weaver


Journal of Dairy Science | 1991

Postparturient metabolic and production responses in cows previously exposed to long-term treatment with somatotropin.

I.J. Lean; H.F. Troutt; M.L. Bruss; Thomas B. Farver; R.L. Baldwin; John C. Galland; D. Kratzer; Charles A. Holmberg; L.D. Weaver


Journal of Dairy Science | 1994

Pregnancy Incidence in High Producing Dairy Cows Treated with Recombinant Bovine Somatotropin

Emilio Esteban; Philip H. Kass; L.D. Weaver; Joan D. Rowe; Charles A. Holmberg; Charles E. Franti; H. Fred Troutt


Journal of Dairy Science | 1994

Interval from Calving to Conception In High Producing Dairy Cows Treated with Recombinant Bovine Somatotropin

Emilio Esteban; Philip H. Kass; L.D. Weaver; Joan D. Rowe; Charles A. Holmberg; Charles E. Franti; H. Fred Troutt

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H.A. Deluyker

University of California

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I.J. Lean

University of California

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A.S. Azari

University of California

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Emilio Esteban

University of California

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H. Fred Troutt

University of California

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H.F. Troutt

University of California

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Joan D. Rowe

University of California

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