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Journal of Dairy Science Vol. 68 No. 1 163-183
© 1985 by American Dairy Science Association ®
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Assessing Efficiency of Passive Immune Transfer in Dairy Herds1

Dale D. Hancock2

Food Animal Health Research Program, Ohio Agricultural Research and Development Center, Wooster 44691

ABSTRACT

Blood serum immunoglobulin concentrations of calves during their 2nd wk of life had a .97 correlation with 1st wk concentrations. Correlations between 1st wk concentrations and those in the 3rd, 4th, 5th, and 6th wk of life were .91, .90, .81, and .69. Ten herds were divided into those with mortality rates above and below the median. The major difference in distributions of immunoglobulin concentration between the two groups was percent of calves with concentrations less than 2.5 mg/ml during the 1st wk of life, Calves were sampled monthly for a full year in 19 herds, and all but one herd had one or more calves with immunoglobulin concentrations under 5.0 mg/ml. Overall, calves having immunoglobulin concentrations under 5.0 mg/ml were exposed to excess mortality risk; however, most of the excess risk was concentrated in three herds with high mortality rates (16 to 20%). Evaluating the efficiency of passive immune transfer through the use of management data was unreliable in comparison with assaying serum samples for immunoglobulin concentration.

FOOTNOTES

1 Salaries and research support provided by State and Federal funds appropriated to the Ohio Agricultural Research and Development Center, The Ohio State University. Journal Article No. 121-83. This work was in partial fulfillment of the Ph.D. degree at The Ohio State University.

2 Field Disease Investigative Unit, Department of Veterinary Clinical Medicine and Surgery, Washington State University, Pullman 99164-6610.






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Copyright © 1985 by the American Dairy Science Association ®.