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Selection for placental efficiency in swine: Conceptus development.
MedLine Citation:
PMID:  22859770     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The objective of this study was to evaluate correlated responses in conceptus development and traits physiologically relevant for placental function in swine from a selection experiment that resulted in differences in placental weight (PW) and efficiency (PE = birthweight/placental weight). Generation 3, second parity females from two lines with a history of selection on an index predicting either high PE (H) or low PE (L) were mated within line to produce generation 4 litters for evaluation at d 30, 50, 70, 90, and 110 of gestation (n = 5 per line x day combination). Maternal and fetal traits were analyzed by using a model including the fixed effects of line and gestational age, and the random effect of sire within line. Uterine length was not different between lines at any gestational age, but increased (P = 0.06) from 275.0 ± 23.1 cm at d 30 to 338.3 ± 23.3 cm at d 50, and remained relatively unchanged to d 110. Fetal weight was not different between lines from d 30 to d 90, but was lower (P = 0.02) in H than L at d 110 (1280.6 ± 77.0 vs. 1551.1 ± 75.3 g, respectively). Crown-rump length was not different between lines from d 30 to 70, but tended (P = 0.09) to be longer in H than L at d 90 (265.8 ± 8.8 vs. 241.2 ± 10.6 mm, respectively) and was shorter (P = 0.04) in H than L at d 110 (290.6 ± 5.0 vs. 304.9 ± 4.5 mm, respectively). Placental weight increased in both lines from d 30 to 50, at which point it remained relatively unchanged through the rest of pregnancy, except in L that showed a second increase from d 90 to 110. As a result, placental weight was not different between lines from d 30 to 90, but was lower (P < 0.01) in H than L at d 110 (244.6 ± 32.3 vs. 379.2 ± 24.5 g, respectively). Line differences in placental efficiency were not significant at any gestational age. Implantation site length increased slowly for both lines from d 30 to 90, where it remained unchanged to d 110. Implantation site area was higher (P < 0.05) in H than L at d 30 and 50, but was not different between lines for the remainder of pregnancy. These results suggest that in Western breeds, a reduction in placental weight through selection is not accompanied by compensation in placental nutrient transfer and may result in decreased prenatal survival.
Authors:
H Mesa; K M Cammack; T J Safranski; J A Green; W R Lamberson
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-2
Journal Detail:
Title:  Journal of animal science     Volume:  -     ISSN:  1525-3163     ISO Abbreviation:  J. Anim. Sci.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8003002     Medline TA:  J Anim Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Division of Animal Sciences, University of Missouri, Columbia 65211.
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