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SummaryA simple autosomal recessive lethal mutation that causes crowding together of the vertebrae with consequent shortening of the neck and body is described. The percentage of ash in the wing and leg bones was approximately the same as in the normal embryos, but the percentage of ash was less in the scapula, ilium, and ischium than in the corresponding bones of the normal embryos.

SummaryNew Hampshire chickens with onset of inherited muscular dystrophy exhibited elevated plasma aldolase and glutamic oxaloacetic-transaminase (GO-T) activities. Age and sex of birds influenced plasma aldolase activity in both normal and dystrophic groups. GO-T activities varied in different tissues and were greater in a majority of tissues examined from dystrophic birds when compared to normal birds.

Precocious development of immature male fowl has been induced by injection of extracts from the anterior lobe of the pituitary1, 2 and by pregnant mare's serum.3 Less marked response of the ovary, oviduct and head furnishings to extracts of the anterior pituitary has been obtained in the immature female fowl1 while oestrin induces precocious development of the oviduct only.4 In the immature pigeon both the testes and ovary responded to injections of pregnant mare's serum, the increase in the weight of the ovary being less than that of the testes.5 The effect of pregnant mare's serum on the immature female fowl has not been reported.For the experiments here reported pregnant mare's serum containing 50 rat units per cc. (obtained from Dr. H. H. Cole) and oestrin containing 1,000 rat units per cc. prepared by the method of Leonard, Hisaw and Fevold6 from pregnant mare's urine, were used. The birds were injected daily for the duration of the experimental periods.In a series of experiments immature white Legho...

SummaryPyridoxine deficiency in turkeys is characterized by loss of appetite, poor growth, apathy, hyperexcitability when disturbed, convulsions, and death. Pyridoxine prevented the deficiency symptoms.

Rhode Island Red embryos, destined to develop into adults of comparatively large size, proliferate cells at a faster rate than White Leghorn embryos, destined to develop into adults of comparatively small size.1 It is known that glutathione (sulphydryl) stimulates cell proliferation, and that rapidly growing rats and rabbits have a greater concentration of glutathione in their body tissues than less rapidly growing controls.2-3 Furthermore, fasted new-born rabbits which are destined to develop into large adults have a greater concentration of glutathione than those destined to develop into small adults.4The following experiment was performed in order to determine the glutathione concentration of White Leghorn and Barred Plymouth Rock embryos, and to ascertain whether or not a difference in concentration exists between the two breeds. Most of the Leghorns, and all of the Barred Plymouth Rocks used in the experiment were descendants of the stocks used by Asmundson and Lerner in studies on the inheritance of...