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Properties of the Colostrum of the Dairy Cow. V. Yield, Specific Gravity and Concentrations of Total Solids and its Various Components of Colostrum and Early Milk¹

Kansas Agricultural Experiment Station, Manhattan

ABSTRACT

A study was made of changes in yields, specific gravity, total solids, fat, solids-not-fat, total proteins, lactose and ash in mammary secretions collected from dairy cows during the transition period from colostrum to normal milk.

Considerable variation was found in values for yield and for the properties of early mammary secretions collected from different individuals at the same postpartal period. Fat was the most variable constituent. Variability in secretions from different individuals decreased as transition to normal milk progressed.

Yields of mammary secretions increased markedly during the first week post-partum.

Specific gravity, total solids, solids-not-fat, total proteins and ash decreased rapidly during the first four to six milkings, but only relatively small decreases were noted throughout the remainder of the 14 days of the study. Lactose changed in approximately an inverse ratio to the aforementioned properties.

Based on equal weights of dry matter, milk had an energy value the same as or higher than that of colostrum. Proteins contributed a greater percentage to the total energy value of colostrum than to that of milk, while lactose and fat contributed a greater percentage of energy to milk than to first colostrum. The ratio of ash to total solids was higher in milk than in colostrum.

¹ Contribution no. 405, Department of Chemistry and no. 192, Department of Dairy Husbandry.

² Present address: Department of Animal Industry, North Carolina State College, Baleigh.

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