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Crown-Rump Length of Fetuses in Purebred Holstein-Friesian Cows^1,2,

Departments of Dairy Science, Genetics, and Meat and Animal Science, University of Wisconsin, Madison 53706

ABSTRACT

Regressions of crown-rump length in millimeters on day of gestation and of day of gestation on crown-rump length were computed for 229 outbred Hol-stein-Friesian fetuses of known gestation ages. The regressions were DAY = 8.4 + .087 CROWN-RUMP + 5.46 CROWN-RUMP, and CROWN-RUMP = –87.8 + 2.74 DAY for gestationsof 34 to 92 days and CROWN-RUMP = –297.1 + 4.70 DAY for gestations of 98 to 270 days duration.

¹ Research was supported in part by the College of Agricultural and Life Sciences, University of Wisconsin, Madison, as a collaborator under the North Central Region Cooperative Research Project entitled Improvement of Dairy Cattle Through Breeding—NC-2, conducted in cooperation with the Animal Physiology and Genetics Institute, Agricultural Research Center, ARS, USDA, and by Public Health Service Training Grant No. 2-T01-HD-00104-09 from the National Institute of Child Health and Human Development.

² From the Department of Meat and Animal Science (Paper No. 629) and Department of Dairy Science and the Laboratory of Genetics (Paper No. 1643).

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