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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 ...
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]
Broodiness is more common in some chicken breeds than others, indicating that it is a heritable characteristic. Breeds such as Cochin , Cornish and Silkie exhibit a tendency to broodiness, including brooding eggs from other species such as quails , pheasants , turkeys and geese .
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A 23-year-old hiker who survived 13 days lost in the Australian wilderness after stumbling on two granola bars has thanked his rescuers for enduring “tough conditions” to find him.
This is a collection of lists of mammal gestation period estimated by experts in their fields. The mammals included are only viviparous (marsupials and placentals) as some mammals, which are monotremes (including platypuses and echidnas) lay their eggs.