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Titolo:
Effects of litter size on maternal care, body weight and infant development in golden hamsters (Mesocricetus auratus)
Autore:
Guerra, RF; Nunes, CRD;
Indirizzi:
Univ Fed Santa Catarina, Dept Psicol, Lab Psicol Expt, BR-88040900 Florianopolis, SC, Brazil Univ Fed Santa Catarina Florianopolis SC Brazil BR-88040900 BC SC, Brazil
Titolo Testata:
BEHAVIOURAL PROCESSES
fascicolo: 3, volume: 55, anno: 2001,
pagine: 127 - 142
SICI:
0376-6357(20010903)55:3<127:EOLSOM>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOTHER-YOUNG CONTACT; PARENT-OFFSPRING CONFLICT; NORWAY RATS; RATTUS-NORVEGICUS; THERMAL CONTROL; PUP DEVELOPMENT; BEHAVIOR; AGGRESSION; MICE; RODENTS;
Keywords:
maternal behavior; pup development; body weight; bodily interaction; pup retrieval; locomotor activity; litter size; golden hamster;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
55
Recensione:
Indirizzi per estratti:
Indirizzo: Guerra, RF Univ Fed Santa Catarina, Dept Psicol, Lab Psicol Expt, BR-88040900 Florianopolis, SC, Brazil Univ Fed Santa Catarina Florianopolis SC Brazil BR-88040900 BC
Citazione:
R.F. Guerra e C.R.D. Nunes, "Effects of litter size on maternal care, body weight and infant development in golden hamsters (Mesocricetus auratus)", BEHAV PROC, 55(3), 2001, pp. 127-142

Abstract

The effects of litter size on maternal care. body weight and infant development of golden hamsters were investigated from a longitudinal perspective. Litters were culled to 1, 3, 6 and 9 pups, and the behavior and body weight of mothers and pups were recorded from the 5th to the 25th postpartum day. We noted that the time spent by mothers in bodily interactions with pups decreased as a function of litter sized maternal pup retrievals reached their maximum around the 13-15th day. which coincided with the increased locomotor activity of pups at this time; the total number of pup retrievals by the mother increased as a function of the litter size, but mothers of largerlitters were more 'efficient' (i.e. they failed less frequently in exhibiting a full sequence of retrievals) and exhibited a low litter-size proportional mean number of retrievals. All mothers gradually lost body mass throughout lactation, and decrease in body weight was significantly related to litter size. The mean body weight gain (%) by pups decreased as a function oflitter size., but we also noted that single and larger litter pups exhibited a decreased body mass (grams) by the 15th day, suggesting that infant development may be impaired at both extremes of experimental conditions. We concluded that the behavior of mothers and pups was affected by the litter size, and it appeared that the litter had an optimal size-not so large as tooverlap the mother's physical capacity. and not so small as to fail to compensate for the parental investment. (C) 2001 Elsevier Science B.V.. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 09:50:31