Reproductive and regulatory behaviours in the female hamster following transections of the lateral connections of the medial preoptic area-medial anterior hypothalamic continuum
Thesis (M.Sc.)--Memorial University of Newfoundland, 1981. Psychology Bibliography: leaves 61-71. Parasagittal knife cuts with a varied mediolateral position were placed along the medial preoptic area-medial anterior hypothalamic continuum (MPOA-MAH) in female hamsters. Near lateral (NL) knife cuts...
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ftmemorialunivdc:oai:collections.mun.ca:theses2/55738 2023-05-15T17:23:34+02:00 Reproductive and regulatory behaviours in the female hamster following transections of the lateral connections of the medial preoptic area-medial anterior hypothalamic continuum Miceli, Mario, 1956- Memorial University of Newfoundland. Dept. of Psychology 1981 vi, 71 leaves : ill. Image/jpeg; Application/pdf http://collections.mun.ca/cdm/ref/collection/theses2/id/55738 Eng eng Electronic Theses and Dissertations (24.16 MB) -- http://collections.mun.ca/PDFs/theses/Miceli_Mario2.pdf 75162633 http://collections.mun.ca/cdm/ref/collection/theses2/id/55738 The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries Parental behavior in animals Text Electronic thesis or dissertation 1981 ftmemorialunivdc 2015-08-06T19:16:35Z Thesis (M.Sc.)--Memorial University of Newfoundland, 1981. Psychology Bibliography: leaves 61-71. Parasagittal knife cuts with a varied mediolateral position were placed along the medial preoptic area-medial anterior hypothalamic continuum (MPOA-MAH) in female hamsters. Near lateral (NL) knife cuts severed mediolateral connections between the MPOA-MAH and the medial forebrain bundle (MFB) while far lateral cuts (FL) were placed more laterally, sparing MPOA-MAH. - MFB connections. Across the knife cut condition, hamsters were either allowed to construct and maintain a food hoard or given 'daily food rations. Prior to, and after surgery, animals were tested for male-soliciting ultrasonic vocalizations and maternal behaviours. Both NL and FL cuts reduced rates of ultrasonic calling. These cuts also converted into cannibals those animals which previously behaved maternally towards foster pups in preoperative virgin maternal tests. These cuts were less effective in this respect if the hamsters were allowed to hoard. These same animals were then mated and later tested for maternal behaviour with their own young. The results of the behavioural testing early in the postpartum period revealed no differences among the experimental groups in various maternal behaviours. Throughout lactation, however, the majority of NL and FL hamsters given daily food rations progressively cannibalized their entire litters. NL and FL counterparts with the harding opportunity, on the other hand, cannibalized fewer pups and reared healthy, moderate-sized litters that were smaller than those of appropriate surgical controls. This is the first study to demonstrate that rodents with (NL) hypothalamic cuts which ordinarily disrupt maternal behaviours, will, under appropriate testing conditions, rear litters. In view of this finding, the nature of the maternal deficit following hypothalamic cuts is discussed. That FL cuts were just as effective as NL cuts in reducing ultrasonic calling and disrupting maternal processes suggests that mediolateral connections of the MPOA-MAH, other than with the MFB, are important for these behaviours. Possible amygdalar-hypothalamic pathways mediating these behaviours are discussed. The effects of the knife cuts and hoarding condition on body weight and other regulatory behaviours are also evaluated. Thesis Newfoundland studies University of Newfoundland Memorial University of Newfoundland: Digital Archives Initiative (DAI) Harding ENVELOPE(75.033,75.033,-72.900,-72.900) |
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Memorial University of Newfoundland: Digital Archives Initiative (DAI) |
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language |
English |
topic |
Parental behavior in animals |
spellingShingle |
Parental behavior in animals Miceli, Mario, 1956- Reproductive and regulatory behaviours in the female hamster following transections of the lateral connections of the medial preoptic area-medial anterior hypothalamic continuum |
topic_facet |
Parental behavior in animals |
description |
Thesis (M.Sc.)--Memorial University of Newfoundland, 1981. Psychology Bibliography: leaves 61-71. Parasagittal knife cuts with a varied mediolateral position were placed along the medial preoptic area-medial anterior hypothalamic continuum (MPOA-MAH) in female hamsters. Near lateral (NL) knife cuts severed mediolateral connections between the MPOA-MAH and the medial forebrain bundle (MFB) while far lateral cuts (FL) were placed more laterally, sparing MPOA-MAH. - MFB connections. Across the knife cut condition, hamsters were either allowed to construct and maintain a food hoard or given 'daily food rations. Prior to, and after surgery, animals were tested for male-soliciting ultrasonic vocalizations and maternal behaviours. Both NL and FL cuts reduced rates of ultrasonic calling. These cuts also converted into cannibals those animals which previously behaved maternally towards foster pups in preoperative virgin maternal tests. These cuts were less effective in this respect if the hamsters were allowed to hoard. These same animals were then mated and later tested for maternal behaviour with their own young. The results of the behavioural testing early in the postpartum period revealed no differences among the experimental groups in various maternal behaviours. Throughout lactation, however, the majority of NL and FL hamsters given daily food rations progressively cannibalized their entire litters. NL and FL counterparts with the harding opportunity, on the other hand, cannibalized fewer pups and reared healthy, moderate-sized litters that were smaller than those of appropriate surgical controls. This is the first study to demonstrate that rodents with (NL) hypothalamic cuts which ordinarily disrupt maternal behaviours, will, under appropriate testing conditions, rear litters. In view of this finding, the nature of the maternal deficit following hypothalamic cuts is discussed. That FL cuts were just as effective as NL cuts in reducing ultrasonic calling and disrupting maternal processes suggests that mediolateral connections of the MPOA-MAH, other than with the MFB, are important for these behaviours. Possible amygdalar-hypothalamic pathways mediating these behaviours are discussed. The effects of the knife cuts and hoarding condition on body weight and other regulatory behaviours are also evaluated. |
author2 |
Memorial University of Newfoundland. Dept. of Psychology |
format |
Thesis |
author |
Miceli, Mario, 1956- |
author_facet |
Miceli, Mario, 1956- |
author_sort |
Miceli, Mario, 1956- |
title |
Reproductive and regulatory behaviours in the female hamster following transections of the lateral connections of the medial preoptic area-medial anterior hypothalamic continuum |
title_short |
Reproductive and regulatory behaviours in the female hamster following transections of the lateral connections of the medial preoptic area-medial anterior hypothalamic continuum |
title_full |
Reproductive and regulatory behaviours in the female hamster following transections of the lateral connections of the medial preoptic area-medial anterior hypothalamic continuum |
title_fullStr |
Reproductive and regulatory behaviours in the female hamster following transections of the lateral connections of the medial preoptic area-medial anterior hypothalamic continuum |
title_full_unstemmed |
Reproductive and regulatory behaviours in the female hamster following transections of the lateral connections of the medial preoptic area-medial anterior hypothalamic continuum |
title_sort |
reproductive and regulatory behaviours in the female hamster following transections of the lateral connections of the medial preoptic area-medial anterior hypothalamic continuum |
publishDate |
1981 |
url |
http://collections.mun.ca/cdm/ref/collection/theses2/id/55738 |
long_lat |
ENVELOPE(75.033,75.033,-72.900,-72.900) |
geographic |
Harding |
geographic_facet |
Harding |
genre |
Newfoundland studies University of Newfoundland |
genre_facet |
Newfoundland studies University of Newfoundland |
op_source |
Paper copy kept in the Centre for Newfoundland Studies, Memorial University Libraries |
op_relation |
Electronic Theses and Dissertations (24.16 MB) -- http://collections.mun.ca/PDFs/theses/Miceli_Mario2.pdf 75162633 http://collections.mun.ca/cdm/ref/collection/theses2/id/55738 |
op_rights |
The author retains copyright ownership and moral rights in this thesis. Neither the thesis nor substantial extracts from it may be printed or otherwise reproduced without the author's permission. |
_version_ |
1766113397821145088 |