Ott, Stephen L. - United States Department of Agriculture, National … - 1996
percentage of cows for low production that was unrelated to disease than did producers of smaller herds, classified as having … fewer than 100 cows: cows having low production consisted of 28.1 percent of cull cows from larger herds versus 19.2 percent … of cull cows from smaller herds. Use of specific milk production levels to determine timing of culling in combination …