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Crop milk is a secretion from the lining of the crop of parent birds in some species that is regurgitated to young birds. It is found among all pigeons and doves where it is also referred to as pigeon milk. Crop milk is also secreted from the crop of flamingos and the male emperor penguin, [1] [2] [3] suggesting independent evolution of this ...
The amnion is a membrane that initially covers the embryo and eventually fills with amniotic fluid, provides the embryo with protection against shock from movement; The allantois helps the embryo obtain oxygen and handles metabolic waste; The chorion, together with the amnion, forms the amniotic sac and encloses the amnion, vitellus, and the embryo
Female birds are able to produce more of a certain gender of birds that are more likely to survive under extreme conditions. In birds, the females' egg determines the gender of the offspring, not the male's sperm. In zebra finches, a study showed the effect of food on gender ratio production. For females, egg production is a metabolically ...
For early cleavage embryos, frozen ones appear to have at least as good obstetric outcome, measured as preterm birth and low birthweight for children born after cryopreservation as compared with children born after fresh cycles. [9] Oocyte age, survival proportion, and number of transferred embryos are predictors of pregnancy outcome. [12]
Frozen embryos can be stored in liquid nitrogen tanks within the facility they were produced in or at outside facilities that specialize in cryopreservation, says Stein — and they have a long ...
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 ...
Alabama's largest hospital paused in vitro fertilization treatments Wednesday as providers and patients across the state scrambled to assess the impact of a state court ruling that frozen embryos ...
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