Conclusion
As a result of the investigations I state as conclusion that all data seem to indicate thatone genetic factor exists which causes the difference in content of butter-fat in the milk of the Jersey and Red Danish breeds. This genetic factor varies in its effect, but the effect is equally great whether it meets a gene for high or low percentage butter-fat. Besides this, it is possible that some of the Jersey bulls used in the experiment had a modifying factor which caused an increase in butter-fat percentage, but the existence of this factor has not yet been definitely proved.
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Wriedt, C. The inheritance of butter-fat percentage in crosses of Jersey with red Danes. Journ. of Gen. 22, 45–63 (1930). https://doi.org/10.1007/BF02983367
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DOI: https://doi.org/10.1007/BF02983367