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Effect of Lactose Content and Milking Interval on Mammary Blood Flow^1,2,

Animal Science Department, North Carolina State University, Raleigh 27607

ABSTRACT

Eighteen primiparous mice in their 6th to 9th day of lactation were randomly divided into groups of six. Each group was assigned to one of the three milking intervals, .25, 4, and 12 h. Blood flow was measured simultaneously in right and left abdominal mammary glands by Sapirstein's indicator fractionation technique with sodium²⁴ chloride as the indicator. Lactose was extracted from the same tissue and quantified by gas chromatography.

Up to 4 h, mammary blood flow was inversely related to the amount of milk accumulated in mammary gland. Around 4 h blood flow started to level off and somewhere between 4 and 12 h reached a maintenance rate. Rate of lactose synthesis was markedly reduced in this period. The relationship between mammary blood flow (Y) and lactose content (X) in the tissue was curvilinear, Y = 4.43 - .83X + .06X² (correlation - .83).

¹ Paper 3895 of the Journal Series of North Carolina State University Agricultural Experiment Station, Raleigh.

² This study was supported in part by Agricultural Foundation funds.

³ Partial fulfillment of requirements for the Ph.D. degree.