Show IMPROVE BUTTERFAT YIELDS in 10 years members of dairy herd improvement associations throughout the country have so unproved improved their herds that the average yearly butterfat production of association cows has increased about 30 pounds reports dr J F kendrick of the federal bureau of dairy industry this increase in production brought about by culling out poor producers by feeding the remaining cows according to production and by better selection of dairy sires has increased returns to association members by about a year |