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305-day record ANALYSIS OF VARIANCE average of four average of three average production averages of records Ayrshire breeders Brown Swiss cattle butterfat and percentage butterfat production cent correlation cow's dairy cattle daugh daughters on dams days in length differences duction four records fourth lactation genetic Gowen heritability and repeatability heritability estimates heritability value Heritabillty high group high producing herds highly significant Holstein Canada Holstein-Friesian intrasire regression Iowa DHIA Johansson 1955 Lactation Comparisons lactation daughter-dam pairs lactation group lactation records low group Lush and Straus mature equivalent Michigan State University milk and butterfat Milk Butterfat Test non-significant number of records obtained percentage of butterfat pounds of butterfat pounds of milk producing ability progeny test record group record of dam records of daughters regression of daughter reliability second lactation second records shown in Table sires within herds standard errors Swedish Breeds terfat third lactation third record three records tion Wisconsin yield