This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...evident there. There is one other breed difference yet to be considered, which has led, probably more than anything else, to the belief that Jersey and Guernsey cows can produce yellow butter fat at any time, regardless of feed. This difference has to do primarily with the storage of pigment in the body, and its ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1913 Excerpt: ...evident there. There is one other breed difference yet to be considered, which has led, probably more than anything else, to the belief that Jersey and Guernsey cows can produce yellow butter fat at any time, regardless of feed. This difference has to do primarily with the storage of pigment in the body, and its discussion belongs properly to the two subsequent papers of this series. A brief statement here in regard to it however will prevent a doubt arising in the minds of some readers, whose practical experience is apparently contrary to the experimental evidence here offered. Stating the question in hypothetical form, it may be said that if a Jersey (or Guernsey) and a Holstein cow, both giving well-colored milk fat, the possibility of which cannot be denied in the light of the evidence which has been offered on this point, are put upon dry feed containing little or no carotin and xanthophylls, the color of the milk fat will drop much faster with the Holstein cow than with the Jersey (or Guernsey) cow, unless great care is taken to provide a ration as nourishing and palatable as the previous pigmented one. The result will be that the Jersey (or Guernsey) cow will appear to be producing colored milk fat on a non-pigmented ration. The explanation for this has already been given in connection with feeding Experiments Nos. 1 and 6, and lies in the fact that the body fat of Jersey and Guernsey cows furnishes a supplementary storage of pigments not usually found in other breeds. It will be shown in a subsequent paper that if the body fat which furnishes the supplementary pigments in the case of the Jersey (or Guernsey) cow is laid on with a non-pigmented ration, it will be as colorless as is often seen in the case of the body fat of Holstein cows. If this were...
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