By Peter H. Klopfer (auth.), David J. Gubernick, Peter H. Klopfer (eds.)
The editors of this quantity have commemorated me by way of their invitation to put in writing its Fore note, a call for participation prolonged due to my modifying a e-book at the maternal behav ior of mammals in 1963. a lot as i need to imagine that I had opened a brand new sector of study-and so performed a few half within the visual appeal of this high quality new collec tion of chapters-the evidence are relatively in a different way. that during 1963 i'll gather the efforts of many exotic investigators exhibits that the subject had already engaged their cognizance, and had for a few years previous. yet even then, the subject had origins extending a lot farther into the prior, to say merely Wiesner and Sheard's e-book Maternal habit within the Rat of 1933. however, in 1963 it looked as if it would me that the research of maternal care in mammals had lagged at the back of the examine of alternative forms of social habit. the current quantity does a lot to set up parental care of the younger as a subject imperative to an knowing of the relation among ontogeny and phylogeny, to the improvement of the younger, to the social association of the species, and to its maintenance. it might now be noticeable not just as attention-grabbing yet as a so much signifi cant trend of habit between mammals.
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Extra info for Parental Care in Mammals
Newborn lambs were used for testing. Ewes responded maternally during estrus (25% of the ewes) and again at 135 days' 36 JAY S. ROSENBLATT AND HAROLD I. SIEGEL gestation (35'70 of the ewes). High estrogen levels and low progesterone levels at parturition resulted in maternal behavior in all of the ewes. On the other hand, when the reverse hormonal condition existed, on the 45th, 75th, and 105th days of pregnancy, none of the females responded maternally to the lambs. The specific roles of estrogen and progesterone in the onset of maternal behavior were investigated by administering these hormones separately to multiparous, intact, and ovariectomized ewes (Poindron and Le N eindre, 1979, 1980).
During the course of this treatment they were tested either with newborn kids or kids less than 2 days of age, after 3 or 6 days of estrogen/ progesterone treatment, and again on the 21st or 22nd day during the administration of hydrocortisone. Although lactation was successfully induced by this regime, due largely to the endogenous release of prolactin between days 7 and 18 of treatment, none of the 9 does tested at 3 or 6 days exhibited maternal behavior and only 2 of 11 of the females accepted kids at 21-22 days.
ROSENBLATT AND HAROLD I. , 1963) initiated hormone treatments using, at various times, different combinations of estrogen and progesterone, and occasionally prolactin. , 1962a,b). Maternal nest building was stimulated in more than 80% of intact and ovariectomized females using this treatment schedule. , 1971). Moreover, rabbits that were hypophysectomized during the last third of pregnancy also failed to build nests following the induced abortions. These results implied that the pituitary hormone prolactin might be involved in the hormonal stimulation of maternal nest building.
Parental Care in Mammals by Peter H. Klopfer (auth.), David J. Gubernick, Peter H. Klopfer (eds.)