5Heinrichs A J. Hargrove G L. Standards of Weight and Height for Ayrshire, Brown Swiss, and Milking Shorthorn Heifers[J]. Department of Dairy and Animal Science,2002(2) : 16. 被引量:1
6Sieber M ,Freeman A E ,Kelley D H. Effects of Body Meas- urements and Weight on Calf Size and Calving Difficulty of Holsteins[J]. J Dairy Sci, 1989,72 : 2402-2410. 被引量:1