Document Detail

Lambs prevented from suckling their mothers display behavioral, immune and endocrine disturbances.
MedLine Citation:
PMID:  12536014     Owner:  NLM     Status:  MEDLINE    
The aim of the experiment was to assess the effects of either maternal deprivation or prevented suckling on lambs. Thirty Comisana lambs were assigned to a control dam-suckled group (DS) and two test groups of 10 each. Test lambs were maintained with their mothers 24 to 30 h after parturition and subsequently offered ewe milk from buckets: EM lambs were separated from their mothers, while EM+D animals were reared with their dams but suckling was denied by covering ewe udders with juta bags. Behavioral, immune and cortisol responses of lambs were assessed throughout the experiment. EM+D lambs spent less time (P<.001) on investigative behavior compared to the two other groups. When isolated in a novel environment, EM+D lambs exhibited a shorter duration of movement (P<.01) and a longer latency time compared to DS and EM lambs (P<.001 and P<.05, respectively) as well as a higher number of bleats (P<.01) than EM lambs. EM+D lambs also displayed higher (P<.001) plasma cortisol levels than the other two groups when isolated at 4 days of age. When subjected to discrimination tests, EM+D lambs spent less time near their companions (P<.01) than EM lambs and took a longer time to reach their pen mates (P<.01) than DS and EM lambs. EM+D lambs displayed reduced growth (P<.001) compared to DS animals during the 0-7 and 8-14-day periods. We conclude that frustration arising from maternal feeding deprivation results in altered endocrine and behavioral responses and reduced growth suggesting emotional disturbances of lambs.
Fabio Napolitano; Giovanni Annicchiarico; Mariangela Caroprese; Giuseppe De Rosa; Luigi Taibi; Agostino Sevi
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Physiology & behavior     Volume:  78     ISSN:  0031-9384     ISO Abbreviation:  Physiol. Behav.     Publication Date:  2003 Jan 
Date Detail:
Created Date:  2003-01-21     Completed Date:  2003-05-19     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0151504     Medline TA:  Physiol Behav     Country:  United States    
Other Details:
Languages:  eng     Pagination:  81-9     Citation Subset:  IM    
Dipartimento di Scienze delle Produzioni Animali, via Nazario Sauro, 85100 Potenza, Italy.
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MeSH Terms
Animals, Suckling / immunology,  psychology*
Behavior, Animal / physiology*
Discrimination (Psychology) / physiology
Endocrine System / physiology*
Hydrocortisone / blood
Immunity / physiology*
Leukocyte Count
Maternal Deprivation*
Milk / chemistry
Ovalbumin / immunology
Phytohemagglutinins / immunology
Social Behavior
Social Isolation / psychology
Weight Gain / physiology
Reg. No./Substance:
0/Phytohemagglutinins; 50-23-7/Hydrocortisone; 9006-59-1/Ovalbumin

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