A Study of the Incubation Periods of Birds; What Determines Their Lengths

A Study of the Incubation Periods of Birds; What Determines Their Lengths

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 edition. Excerpt: ...is given as 102 F. (early) and 103 F. (late) (33); for ducks (sp?) for the first three weeks as 102 F., and the.last week 103 F. (34); for the ostrich 101 F (160), and for the rhea (Rhea Americana) as 103 F. There is a large field for research in this question of temperatures of artificial incubation; there is also an engaging and unexploited field for investigation in the temperature conditions of the nest in natural incubation; special thermometers have been constructed to register this temperature, but the data are too few to require special notice here. This method of study might be undertaken with the aid of the ordinary clinical thermometer, and it remains to, and should, be vigorously prosecuted. While it is known that there is a slight upward swing of the optimum temperature towards the end of artificial incubation, it has not yet been demonstrated in natural conditions.-Still so much points to the high probability of its existence also in natural incubation that one can safely accept it as tentatively demonstrated. If there be an optimum incubation temperature, which varies with the species and, also, according to the degree of embryonic development in the egg, it would seem safe to predict that differing bird species should exhibit, under normal conditions of health, differing body temperatures, and perhaps, in a given individual, this normal temperature should be found to vary according to the stage of incubation, since the parent's body heat is that which develops its embryo in practically all of the myriads hatched each year. It then becomes self-evident that the optimum incubation temperature for any species is the temperature of the incubating parent (true or foster). The physiology of a bird's temperature is...show more

Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236770072
  • 9781236770073