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Intrauterine crowding impairs formation and growth of secondary myofibers in pigs

Published online by Cambridge University Press:  01 October 2012

C. E. Pardo ,
J. Bérard ,
M. Kreuzer  and
G. Bee
C. E. Pardo
Affiliation:
Agroscope Liebefeld-Posieux, Research Station ALP, 1725 Posieux, Switzerland ETH Zurich, Institute of Agricultural Science, Universitätstrasse 2, 8092 Zurich, Switzerland
J. Bérard
Affiliation:
Agroscope Liebefeld-Posieux, Research Station ALP, 1725 Posieux, Switzerland ETH Zurich, Institute of Agricultural Science, Universitätstrasse 2, 8092 Zurich, Switzerland
M. Kreuzer
Affiliation:
ETH Zurich, Institute of Agricultural Science, Universitätstrasse 2, 8092 Zurich, Switzerland
G. Bee*
Affiliation:
Agroscope Liebefeld-Posieux, Research Station ALP, 1725 Posieux, Switzerland
*
† E-mail: giuseppe.bee@alp.admin.ch
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Abstract

There are indications that intrauterine crowding may cause intrauterine growth retardation with the possibility of an impaired myofiber hyperplasia. The aim of the study was to confirm this by generating large differences in uterine space using sows that were unilaterally hysterectomized-ovariectomized (HO; crowded) or unilaterally oviduct ligated (OL; non-crowded). In the study, seven HO and seven OL Swiss Large White third parity sows were used. At farrowing, litter size and litter birth weight were determined. Subsequently, within each litter two male and two female progenies each with the respectively lowest (L) and highest (H) birth weight were sacrificed. Internal organs and brain were weighed, and longissimus (LM) and semitendinosus muscle (SM) samples were collected. Histological analyses were performed in both muscles using mATPase staining after preincubation at pH 4.3 and 10.2. Myosin heavy chain (MyHC) polymorphism was determined in the LM by means of SDS-PAGE. The number of piglets born alive was similar in both sow groups, but litter size expressed per uterine horn was lower (P < 0.05) in OL than HO sows. Consequently, OL progeny were markedly heavier (P < 0.01). Regardless of gender, the organs, the brain and the SM were heavier (P < 0.001) in OL and H compared with HO and L offspring, respectively. Compared with HO pigs, the SM of OL offspring tended (P < 0.1) to have more myofibers, which were of larger (P < 0.05) size. However, myofiber density appeared to be lower (P < 0.1) in the SM of OL than HO pigs. The impact of birth weight on myofiber characteristics was limited to the lower (P < 0.05) myofiber density in the SM and the larger (P < 0.01) myofiber size in the light portion of the SM of H than L offspring, whereas myofiber hyperplasia did not differ between birth weight categories. The SM, but not the LM, of male offspring had a greater (P < 0.05) myofiber density. This did not affect total SM myofiber number. The relative abundance of fetal and type I MyHC in the LM was lower (P < 0.05) and that of type II MyHC was greater (P < 0.001) in OL than HO pigs. The current data suggest that regardless of birth weight and gender, in the LM and SM of individuals born from a crowded environment, not only hyperplasia but also hypertrophy of myofibers is impaired and their maturity seems delayed.

Keywords

birth weightintrauterine crowdingmyogenesispig
Type
Physiology and functional biology of systems
Information
animal , Volume 7 , Issue 3 , March 2013 , pp. 430 - 438
Copyright
Copyright © The Animal Consortium 2012

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