Ueber Sauerstoffproduction im Hühnerei¹

Abstract

__In einer fruheren Abhandlung wurden zwei Respirationwersuche mit Hiihnereiern wiihrend der ersten 5 bis 6 Brutnngsstunden mitgetheilt, die eine Sauerstoffahgabe yon etwa 0.5ccm und eine Stickstoffahgabe von etwa 2 ccm aufweisen.Nach dem, was man bisher von der gemeinschaftlichen Grundlage der Pflanzen-und der Thierphysiologie kennt, sind die

Foetal heat production in the fowl

“…It will be a subject for further investigation to estimate the gas exchange of a freshly laid egg with outdoor air and the gas exchange of the same egg after warming up to incubating temperature. It seems to us that the results mentioned in the literature (Hasselbalch, 1902), in which a possible 02 production during the first days of incubation is claimed, can be explained by the purelyphysicalexchange of gases between egg content and environment. 16-2 243 244 C. ROMIJN AND W. LOKHORST A second point of interest is the fact that the evaporative heat loss of the egg is much greater than the heat production of the embryo during the first week of incubation, with the result of an egg temperature somewhat lower than the incubating temperature.…”

“…Calorific quotient of the chicken embryo, calculated from results published by different authors. El, Bohr & Hasselbalch (1903); 0, Hasselbalch (1902); 0, Barott (1937); A, this paper. and after that time there is again an increase up to 3*5.…”