OCR Text |
Show Records of Cow-Testing Association Are Exact Yearly milk and butterfat production produc-tion as determined in cow-testing associations asso-ciations by weighing and testing one day's production each month is accurate accu-rate within a very small per cent, says the United States Department of Agriculture. Ag-riculture. To determine the accuracy of the cow-testing association method of calculating yearly production, the department made a study of the actual yearly production records of 70 cows of the Minnesota experiment station. These Minnesota records gave the production pro-duction of milk and butterfat for each milking throughout the year. By systematically picking out the weights and tests for one day each month as they would have been obtained ob-tained by cow-testing association methods and thus calculating the yearly year-ly production it was found that the association method was accurate within with-in 2 per cent on milk production and within 3 per cent on production of butterfat. A tabulation was also made of 100 yearly Individual cow records from the department farm at Beltsvllle, Md. These records gave only the milk production pro-duction night and morning for each day In the year. A yearly total, calculated calcu-lated from one day's record each month, when compared with the actual milk production showed an accuracy -within 1.99 per cent. These comparisons compari-sons indicate that the method used in cow-testing association work gives at very accurate record of production. |