A - Human Necessities – 01 – K
Patent
A - Human Necessities
01
K
A01K 41/00 (2006.01) A01K 67/02 (2006.01)
Patent
CA 2151608
A method of hatching eggs of avian species, especially chickens, which comprises carrying out at least one cycle of steps (a) to (c) as follows: (a) incubating the eggs in a first, baseline ambient environment which is normal for hatchery incubation of the eggs of the avian species in the prevailing climatic conditions and then during a sex-sensitive time window of embryonic development, (b) altering the ambient environment to shifted conditions for a period of time effective to bias the normal phenotypic sex ratio of the embryos, without significant adverse effect on the average mortality rate, and (c) thereafter restoring the incubation conditions to or towards normal and allowing the eggs to hatch. Preferably the ambient environment comprises a temperature of 37.5-38 °C and the shifted conditions comprise reduced temperature, especially a temperature maintained at about 22 °C for a period of from 18 to 42 hours. The method may be used to produce birds which are chromosomally male (ZZ) but phenotypically female or chromosomally female (ZW) but phenotypically male.
Fetherstonhaugh & Co.
The Victoria University Of Manchester
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