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Effect of Milking Time on Solids in Milk from Holsteins¹

Dairy Department, University of Wyoming, Laramie

ABSTRACT

In recent years, the dairy industry has placed increasing emphasis on the nonfat solids portion of milk, and attention has been focused on the scarcity of comprehensive data illustrating the characteristics of solids in milk. This study was conducted for the purpose of determining variations of the solid-milk components, between the morning and evening milk of individual cows.

Whether milk from an individual cow is sampled during the morning or evening milking may have an effect on its solids content. Citations of Peterson (5), Turner (8), and Wing (9), on milk yield and fat test of morning and evening milk, have led to the conclusion that when the interval was even, there was a greater milk yield but a lower fat test in the morning milk. Bailey (1) and Bartlett (2) showed a very slight decline in solids-not-fat of morning herd milk over evening herd milk.

Eckles and Shaw (3), reporting on the average production of five cows for 14 consecutive days, showed that the solids-not-fat content was higher in the evening milk for two Holsteins, but lower in the evening milk for one Ayrshire and two Jersey cows.

¹ Published with approval of the Director, Wyoming Agricultural Experiment Station, as Journal Paper No. 95.