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Yield and Protein Composition in Cows Milked Prepartum

Faculty of Agriculture, Hebrew University, Rehovot, Israel

ABSTRACT

Fifteen cows in various lactations were milked for an average of 14 days prepartum. Most cows were stimulated for increased secretion 2 or 3 days before parturition. Prepartum milking resulted in an earlier peak of milk secretion in all cows so treated as well as a 10% increase in milk yield in the first 100 days of lactation. The protein contained 60% immunoglobulins 14 days before parturition. This percent decreased rapidly from the 4th day before parturition to 25% on the day of parturition and 3.3% of the protein 2 days later. Caseins increased from 28% of the protein on the 4th day prepartum to 64% on the 2nd day postpartum. Edema was only slightly reduced by prepartum milking.