It is always important to monitor the yield of milk and the composition of milk, especially for the individual farmer, because the income of the dairy farm depends on this source of revenue. The yields of protein and fat are the primary determinants of the price received by farmers. The proportions of fat and protein are useful in monitoring cow health and feeding practices within a farm. The income over feed costs (IOFC) and feed costs per hundred of milk are important monitors of costs of milk production.
The average production of milk, fat, and protein by breed for Ohio dairy herds in 2016 using the Dairy Herd Improvement (DHI;http://www.dhiohio.com) program are provided in Table 1. Not all herds on DHI are included in the table below because of the different testing options offered by DHI, some herds opt for no release of records, lack of sufficient number of test dates, and given that some of the herds consist of other breeds than the ones shown. In comparison, the average of milk yield for all cows (266,000) in Ohio for 2015 was 20, 875 lb milk with 3.78% fat.
Table 1.Number of herds, milk yield, milk fat, and milk protein by breed for Ohio herds on DHI during 2016.