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Journal of Dairy Science Vol. 64 No. 1 62-70
© 1981 by American Dairy Science Association ®
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Effects of Age, Temperature-Season, and Breed on Blood Characteristics of Dairy Cattle1

L. Shaffer, J. D. Roussel and K. L. Koonce2

Department of Dairy Science, Louisiana Agricultural Experiment Station, Louisiana State University, Baton Rouge 70803

ABSTRACT

Two hundred twenty four dairy cattle (6 mo to second calving) representing four breeds (169 Holstein, 24 Guernsey, 19 Jersey, 12 Brown Swiss) were used to determine effects of age, temperature-season, and breed on blood characteristics. A total of 1183 blood samples were collected by jugular venipuncture in the middle of each temperature-season.

Covariate age affected blood profile except for hemoglobin, oxyhemoglobin, glutamic-oxaloacetic transaminase, and albumin. Temperature-season increased or decreased all measures except enzyme creatine phosphokinase, total creatine phosphokinase, calcium, and phosphorus. Years differed for all measures except hemoglobin and oxyhemoglobin. Except for enzyme creatine phosphokinase, total creatine phosphokinase, and phosphorus, breeds differed in other measures.

There were interactions between temperature-season and year, temperature-season and breed, and year and breed. Differences among temperature-seasons were not consistent from year to year. Breed differences were not consistent from temperature-season to temperature-season for calcium or protein-bound iodine. Breed differences were not consistent from year to year for glutamic-oxaloacetic transaminase, total protein, albumin, or calcium.

FOOTNOTES

1 Supported in part by Hycel, Inc., Houston, TX.

2 Department of Experimental Statistics.






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Copyright © 1981 by the American Dairy Science Association ®.