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Journal of Dairy Science Vol. 74 No. 7 2336-2341
© 1991 by American Dairy Science Association ®
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Management and Production Factors Influencing Immunoglobulin G1 Concentration in Colostrum from Holstein Cows

Lori C. Pritchett 1, Clive C. Gay 1, Thomas E. Besser 1, and Dale D. Hancock 1

1 College of Veterinary Medicine, Washington State University, Pullman 99164-6610

Immunoglobulin G1 concentration was measured in 919 first milking colostrums from Holstein cows during a 4-yr period on a commercial dairy farm. Sources of variation analyzed for effect on colostral IgG1 concentration were season of calving, lactation number, dry period length, intercalving interval, complete lactation milk and fat production, weight of fist milking colostrum, and time from calving to first milking.

Weight of first milking colostrum was the variable most highly correlated (negatively) with colostral IgG1 concentration (r = –.29). Weight of first milking colostrum and lactation number of the cow were the most significant discriminators between colostrum of low and high IgG1 concentration.

The implications of these results for colostrum feeding management are discussed.

Key Words: colostrum • immunoglobulin G1 • passive transfer

Submitted on November 5, 1990
Accepted on January 22, 1991




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