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Maternal influence on feeding site selection of male and female lambs

Published online by Cambridge University Press:  27 March 2014

R. L. Wesley ,
A. F. Cibils ,
C. M. Black-Rubio ,
E. R. Pollak  and
S. A. Utsumi
R. L. Wesley
Affiliation:
SRP-McGinley Ranch, Gordon, NE 69343, USA
A. F. Cibils*
Affiliation:
Department of Animal and Range Science, MSC 3-I, New Mexico State University, Box 30001, Las Cruces, NM 88003, USA
C. M. Black-Rubio
Affiliation:
Hidalgo Soil and Water Conservation District, Lordsburg, NM 88045, USA
E. R. Pollak
Affiliation:
SRP-McGinley Ranch, Gordon, NE 69343, USA
S. A. Utsumi
Affiliation:
Department of Animal Science and W.K. Kellogg Biological Station, Michigan State University, Hickory Corners, MI 49060, USA
*
†E-mail: [email protected]
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Abstract

We conducted an experiment to determine whether early-life social learning of feeding site selection in lambs was sex-specific. Sixteen ewes and their new born lambs were used in a controlled experiment. Eight ewe–lamb pairs included a male lamb and the remaining eight a female lamb. All pairs were individually exposed to an experimental arena containing a safe and unsafe artificial feeding site (SFS, UFS) each consisting of nine bowls which contained either ground Bermuda grass hay (SFS) or ground alfalfa hay (UFS). The bowls in UFS were surrounded by bright orange traffic cones (visual cues). Half the ewes were trained with controlled electric shock to avoid UFS. Thus, pairs were randomly assigned to: (1) shock aversion training (SAT) to mothers of male lambs (MS); (2) SAT to mothers of female lambs (FS); (3) no aversion training (NAT, control) to mothers of male lambs (MC); and (4) NAT (control) to mothers of female lambs (FC). None of the lambs were subjected to SAT. During training, testing, extinction, and retraining ewe–lamb pairs were exposed to the arena together. Ewes were then removed from the experiment and two additional extinction phases were conducted with weaned lambs alone. Fear conditioning elicited UFS avoidance of both the trained ewes (means±s.e.m. % times observed in UFS during testing phase: FC=95.3±1.70; MC=94.4±4.87; FS=1.6±1.63; MS=0 ±0; P<0.01) and their naïve lambs (FC=83.8±6.07%; MC=76.6±6.56%; FS=30.4±7.90%; MS=33.9±9.23%; P<0.01). UFS avoidance in lambs occurred regardless of sex and tended to persist after weaning (% times observed in UFS during 1st post-weaning extinction phase: FC=92.6±4.50%; MC=89.8±6.09%; FS=45.1±10.57%; MS=43.5±10.42%; P=0.06). Fear conditioning in mothers appeared to alter sex-related differences in mother–infant behavioral synchrony by increasing and decreasing feeding synchrony of male and female lambs, respectively (FC: r=0.52, P<0.01; MC: r=−0.02, P=0.86; FS: r=0.14, P=0.26; MS: r=0.46, P<0.01). During the extinction phase mothers of ram lambs were observed feeding more often (FC=85.0±2.33%; MC=92.7±1.45%; FS=47.3±8.81%; MS=72±5.68%; P=0.02) and standing less often than ewes with daughters (FC=7.3±2.40%; MC=2.7±0.83%; FS=39.3±9.04%; MS=18.0±5.29%; P=0.06). This study suggests that social conditioning at an early age could be a viable tool to induce learning of feeding site avoidance in female and male lambs alike.

Keywords

feeding site selectionsocial learningsex-biased learningdiet selectionsheep
Type
Full Paper
Information
animal , Volume 8 , Issue 6 , June 2014 , pp. 991 - 999
Copyright
© The Animal Consortium 2014 

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