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But that's where German innovator Dr. Heinsohn et al. Parental care and adaptive brood sex ratio manipulation in birds. Log in.
Subject poultry breeding. Potential mechanisms for sex ratio adjustment in mammals and birds. Chicken Behaviors and Egglaying. Full text. However, in the lowlands, temperatures are more constant and a longer activity season allows for favorable conditions does temperature determine sex of chickens in Charleston TSD.
Megapodes eggs have large yolks, and embryos incubated at lower temperatures take longer to hatch Booth and thus may use more yolk during incubation and hatch with a smaller residual yolk sac. And while researchers from the University of Leipzig in Germany are working on a spectroscope that will supposedly be able to do in-ovo testing three days into the incubation period to determine the sex of an egg before it hatches, the technology isn't on the market yet - and I assume will be pretty pricey once it is.
While TSD has been observed in many reptile and fish species, the genetic differences between sexes and molecular mechanisms of TSD have not been determined. The cooling has to be done very precisely. If the eggs are kept at 30C the hatchlings are all female and at 33C they are all male.
Open in a separate window. However, it's not a reputable method either. J, Paukstis G.