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- W2023113226 abstract "Summary The classification ratings of 3,738 paternal sisters and of 1,601 cows out of classified dams were used to estimate the portion of the differences in official type ratings that is transmitted from parents to offspring. This portion is called heritability and from these data this figure is estimated to be 0.3. Thus offspring inherit about one-third of the observed superiority of the parents’ type, and herd improvement in the type of dairy cattle can be made by the selection of animals that are above the herd average in type for parents of the next generation. The correlation between classification rating and production of butterfat was computed from data on 5,177 cows. Within herds there was an average increase of 13 lb. of butterfat for each increase of one grade of type. The relationships between the classification rating and the first butterfat record of a cow, between the type rating of a cow and her butterfat record begun nearest the date of classification, and between the type rating of a cow and the average of all her butterfat records were statistically highly significant, but they were so low that their practical significance is quite small. The correlation coefficients were 0.16, 0.16, and 0.19, respectively." @default.
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- W2023113226 date "1948-01-01" @default.
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- W2023113226 title "The Heritability of Official Type Ratings and the Correlation between Type Ratings and Butter–Fat Production of Ayrshire Cows" @default.
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- W2023113226 doi "https://doi.org/10.3168/jds.s0022-0302(48)92175-4" @default.
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