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Protection against damage caused by lipids in birds is enhanced by vitamin E and other antioxidants that are infused with the carotenoids and yolk. These same antioxidants also prevent the destruction of maternal antibodies (IgY) which are extremely important to survival rate and can be seen as a form of pre-birth parental care. (Grindstaff) [26]
Types of parental care include maternal or paternal care, biparental care and alloparental care. [1] Sexual conflict is known to occur over mating, and further familial conflicts may continue after mating when there is parental care of the eggs or young. For example, conflict may arise between male and female parents over how much care each ...
In this view, paternal care is an evolutionary achievement that compensates for the higher energy demands that reproduction typically involves for mothers. [60] [61] Other models suggest that basic life-history differences between males and females are adequate to explain the evolutionary origins of maternal, paternal, and bi-parental care.
Sexual selection is an evolutionary concept that has been used to explain why, in some species, male and female individuals behave differently in selecting mates. In 1930, Ronald Fisher wrote The Genetical Theory of Natural Selection, [3] in which he introduced the modern concept of parental investment, introduced the sexy son hypothesis, and introduced Fisher's principle.
That imprinting might be a feature of mammalian development was suggested in breeding experiments in mice carrying reciprocal chromosomal translocations. [19] Nucleus transplantation experiments in mouse zygotes in the early 1980s confirmed that normal development requires the contribution of both the maternal and paternal genomes.
WASHINGTON (Reuters) -U.S. government workers who have been buffeted by President Donald Trump's chaotic return to power face more uncertainty on Monday, when many of them will be required to ...
In these cases, the male and female will be continuously assessing each other based on sexual characteristics. In the blue-footed booby, the females tend to choose males with brighter blue feet, because birds with brighter feet are younger, and thus have greater fertility and ability to provide paternal care. [3]
The U.S. Department of Agriculture said Tuesday that, over the weekend, it accidentally fired "several" agency employees who are working on the federal government's response to the H5N1 avian flu ...