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. 1920 Excerpt: ...or similar causes, and a genuinely tuberculous condition may pass unnoticed owing to there being little appreciable rise of temperature following upon the injection. It is well known that moisture present in cold air assists in heat conduction but that moisture in warm air hinders evaporation. This is why a hot dry ...
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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. 1920 Excerpt: ...or similar causes, and a genuinely tuberculous condition may pass unnoticed owing to there being little appreciable rise of temperature following upon the injection. It is well known that moisture present in cold air assists in heat conduction but that moisture in warm air hinders evaporation. This is why a hot dry climate is so much less trying than a hot moist one. In warm, moist, tropical climates it is difficult for the heat-regulating mechanisms to cope with the extreme conditions. Clipping or shearing is liable to throw a severe strain on the heat-regulating apparatus, especially in cold moist weather. For this reason a shepherd cannot be too careful not to shear his sheep when the weather is unfavourable. On the other hand, in very woolly or fat animals the accumulation of heat may be such as to constitute a source of danger. It is interesting to note that in the pig the fat in the dermis is normally well developed, for the pig has few hairs to withstand the conduction of heat. In addition to the heat regulating mechanisms described above there is some evidence that heat production within the body is regulated by the outside temperature. Thus animals which are exposed to cold tend to eat more, and so a greater quantity of food is available for heat production. Starvation produces a lowering of the temperature of the body, and the absorption of food raises it. Cold is least well stood by small lean animals, since in them the surface of the body is greater relative to their weight than in larger animals. The rise of temperature which occurs during fevers is due partly to a defective dissipation of heat, the regulating mechanisms of the skin being deranged. Thus the skin surface is unusually dry and hot. Nevertheless, there is frequently also a great in...
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Add this copy of Physiology of Farm Animals, Volume 1 to cart. $48.02, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2011 by Nabu Press.
