1. Dr. George R. Wiggans, Ph.D. Animal Improvement Programs Laboratory Agricultural Research Service, USDA Beltsville, MD, USA george.wiggans@ars.usda.gov U.S. Genetics Conf., Beijing, China (1)Wiggans The U.S. genetic evaluation system

2. U.S. Genetics Conf., Beijing, China (2)Wiggans U.S. dairy population and milk yield Data sources:http://www.nass.usda.gov/Quick_Stats/index.php http://www.census.gov/prod/www/abs/decennial/http://www.nass.usda.gov/Quick_Stats/index.php http://www.census.gov/prod/www/abs/decennial/

3. U.S. Genetics Conf., Beijing, China (3)Wiggans U.S. DHI dairy statistics (2011) l 9.1 million U.S. cows l ~75% bred AI l 47% milk recorded through Dairy Herd Information (DHI) w 4.4 million cows − 86% Holstein − 8% crossbred − 5% Jersey − <1% Ayrshire, Brown Swiss, Guernsey, Milking Shorthorn, Red & White w 20,000 herds w 220 cows/herd w 10,300 kg/cow Data sources:http://www.nass.usda.gov/Quick_Stats/index.phphttp://www.nass.usda.gov/Quick_Stats/index.php National Association of Animal Breeders, 573-445-4406 http://aipl.arsusda.gov/publish/dhi/part.html http://aipl.arsusda.gov/publish/dhi/herd.html