Heritability and Repeatability of First, Second, Third and Fourth Records of Varying Duration in Brown Swiss Cattle |
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305-day record ANALYSIS OF VARIANCE Arnold Johnson average of four average of three average production Average Std averages of records Ayrshire Big Rapids breeders Brown Swiss cattle butterfat and percentage butterfat production cent cow's dairy cattle daugh daughters on dams days in length DHIA records differences duction estimate heritability four records fourth lactation genetic Gowen heritability and repeatability heritability estimates heritability value 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 records of daughters regression of daughter reliability second lactation second records shown in Table sires within herds terfat third lactation third record three records tion yield