Use it or lose it: enhancing milk production efficiency by frequent milking of dairy cows

¹ Lactation and Mammary Gland Biology Group, University of Vermont, Burlington, VT 05405

^* To whom correspondence should be addressed. E-mail: thomas.mcfadden{at}uvm.edu.

	Abstract

In the past century, great strides have been made toward optimizing milk production efficiency of dairy cows. One of the key findings that have emerged is that the milk yield of dairy cows is responsive to demands of offspring or milk removal; hence milk production can be increased by frequent milking. Early studies illustrated the galactopoietic effect of frequent milking during the entire lactation, with three times daily milking increasing milk yield by up to 20% relative to twice daily milking. Later studies reported that cows produced more milk during the entire lactation if they were allowed to suckle a calf for the first 3 to 4 mo of lactation. The results of these experiments laid the groundwork for current research, which has identified a time during early lactation wherein the mammary gland of dairy cows is especially receptive to the stimulus of frequent milking. This window of time has been slowly whittled down from the first 10 wk of lactation to the first 6 wk, and it was established subsequently that frequent milking for a short duration within the first 3 wk of lactation can increase milk production through the remainder of lactation. In addition, there is strong evidence that this milk yield response is locally regulated. Consequently, the concept of 'use it or lose it' is becoming more clearly established, that is, the stimulus of frequent milking during early lactation permanently increases the milk production capacity of the mammary gland. Exciting research opportunities now present themselves, and ongoing experiments seek to identify the local factor(s) that are involved in the regulation of milk production efficiency of dairy cows.

Key Words: Frequent milking, Mammary gland, Milk production, Suckling

This article has been cited by other articles:

				G. E. Dahl The Eighth International Workshop on the Biology of Lactation in Farm Animals: Introduction J Anim Sci, March 1, 2008; 86(13_suppl): 1 - 2. [Full Text] [PDF]