Show I Records of Cov- Cov Testing Cow Testing Association Are Exact Yearly milk and butterfat production production tion ns as determined in testing cow-testing associations associations asso asso- by weighing weighing- and testing one onedas days day's production each month Is ls accurate acm acm- rate within n a very small per cent says MyS the United States Department of Ag Ag- To determine the accuracy of the testing cow-testing association method of calculating yearly early production the department made a study of the actual yearly production records of ot 70 cows t of the Minnesota experiment station t These rhese Minnesota records gave the production production pro pro- of milk and butterfat for tor each L It milking throughout the year enrBy I By picking out the tie l wel weights and tests for one day each t month as they would have been obtained ob oh- r I tamed by testing cow-testing association methods and thus calculating the yearly yearly year year- r ly Iy production It was found that th the r association method was accurate within within with with- in 2 per cent on milk production and anti within 3 per cent on production of ot I II I butterfat i I A tabulation was also made of ICO lOO yearly yearl Individual cow records from the department at Md Id These records gave only the milk production pro- pro tl lt night nigh t and morning for each t day In the year A yearly yearl total calculated calculated l kited from one days day's record each t month when compared with the actual milk production showed an accuracy within 1 9 per cent These comparisons comport compari ji I sons indicate that the method used in to testing cow-testing association work gives Ivery Ivery I t very accurate record of production |