Parental behavior (Maternal Brain
--> mPOA = maternal care
Maternal behaviors in rodents
- --> licking, grooming
- --> arched back nursing (epigenetic effect, less hpa respnse in grown baby rats)
- --> Pup retrival
- eat / drink more
- maternal aggression
- less fearful, more xploratory (evolutionarry to forrage for food farther than usual if it was scarce :3 !!
--> female rats with babies that are lactating = instant retrival
--> virgin female rats (so no babies or intercourse ever)
-----> without observation of mothers = ignore pups
-----> with observation of mothers = slowly learn to do the same (even not their kids :3 !!) helpfulll ahww <3<3<3<3
--> infantcide if not own pups (evolutionairy advantage)
--> after mating infantcide tendencies increase to 4 days after then drop
--> day 12 to 50 increase paternal care (so doesnt hurt own offspring
--> then attack again
--> mediated by VNO organ (pherhormones)
------> removing it = almost no infantcide and super high paternal care :) !!
California mice (biparental)
--> same prolactine levels as mothers #
--> testosterone needed for parental care (unlike other rodents where its reduced!)
mPOA galanin neurons = important
--> galanin production neccessary
--> no pup retrival if removed
--> optogenetic stimulation = stopped pup attacking behavior (infantcide!!) # #
--> marmot father cary child
--> more PFC activity
--> dendric spines of pyramidal neurons = higher
-----> more vasopressine receptors !
Maternal and hormones
--> progesteron = high + rapid decrease after birth !!
--> estrogen = low and slowly increasing + SHARP increase before giving birth
--> prolactin = low + SHARP increase before birth
--> oxytocin = low + SHARP increase before birth----> hormones prime females for maternal care :3 !! --------> parabiosis, blood of maternal mother to virgin rat = maternal behavior within 24 hours!! #
End of pregnancy
--> less nursing
--> higher body temp via --> prolactin
--> less care for pups to avoid overheating ? as pups grow older they produce more heat .. stupid fuckign theory lol !!