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Colostral Constituents including Immunoglobulins in the First Three Milkings Postpartum¹

Department of Animal Science, University of Minnesota, St. Paul 55108

ABSTRACT

Colostral changes in immunoglobulin (IgG), dry matter, ash, total protein, and whey protein were studied over the first three milkings postpartum. Immunoglobulin IgG concentration in colostrum from Holstein cows beginning their first, second, or third lactation was similar. However, older animals had more IgG in colostrum. Its rate of disappearance from colostrum was greater in younger animals. Dry matter, ash, total protein, and whey protein concentrations decreased from the first to the third milking (24 h) postpartum. Protein was the most variable constituent between cows at the same postpartum time.

¹ Paper No. 9785 of the Journal Series of the Minnesota Agricultural Experiment Station.