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In 2018, Seleggt was the first company to succeed in commercial in-ovo sexing. Seleggt managed to sex the hatching eggs on day 9 of the incubation process with a hormone test. [24] The method is based on the fundamental research of Prof. Dr. Einspanier at Leipzig University. [25]
However, the rate of development can be affected by a range of factors; including the specific breed, the temperature of incubation, the delay between laying and incubation, and the time of year, raising the need to create a standardised system based on morphology rather than chronological age.
Even in other birds, ambient temperatures can lead to variation in incubation period. [7] Normally the egg is incubated outside the body. However, in one recorded case, the egg incubation occurred entirely within a chicken. The chick hatched inside and emerged from its mother without the shell, leading to internal wounds that killed the mother ...
A black sex-link hen. Sex-links [1] are crossbred chickens whose color at hatching is differentiated by sex, thus making chick sexing an easier process. Sex-links come in several varieties.
There is a positive relationship between mass at birth and length of gestation in eutherian mammals. [17] Larger mammals are more likely to produce a well-developed neonate than small mammals.
During the last few days of incubation, the residual yolk is retracted into the body cavity as an extension of the intestine. Post hatch, the residual yolk is the only nutrient source of the chicken until exogenous feed is available. Chickens can use the residual yolk for maintenance during the first few days post hatch. [1]
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Pattern II has been found in American alligators (Alligator mississippiensis and Leopard geckos (Eublepharis macularius). [13] Some reptiles use incubation temperatures to determine sex. In some species, this follows the pattern that eggs in extremely high or low temperatures become female and eggs in medium temperatures become male. [14]