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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]
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 ...
Holoblastic cleavage occurs in animals with little yolk in their eggs, [10] such as humans and other mammals who receive nourishment as embryos from the mother, via the placenta or milk, such as might be secreted from a marsupium. Meroblastic cleavage occurs in animals whose eggs have more yolk (i.e. birds and reptiles).
The main difference is that egg freezing involves eggs that are unfertilized, while embryo freezing involves eggs that have been fertilized with sperm, aka embryos. (It’s worth noting that sperm ...
As bird flu continues to spread across the United States, questions have emerged about the risk of contracting the virus from milk and eggs. Additionally, hundreds of dairy cow herds have been ...
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 ...
Within those three months, frozen milk can be safely consumed — but experts say there are a few other steps you need to take first. "While freezing isn't an issue, thawing can be," Siva says.
The default color of vertebrate eggs is the white of the calcium carbonate from which the shells are made, but some birds, mainly passerines, produce colored eggs. The pigments biliverdin and its zinc chelate give a green or blue ground color, and protoporphyrin produces reds and browns as a ground color or as spotting.