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pubmed-article:11219451pubmed:abstractTextAn experiment was conducted to study the effects of major dietary energy source fed from weaning to ovulation or from ovulation to d 35 of pregnancy on reproductive traits in primiparous sows. Dietary energy sources were used to manipulate the plasma insulin concentration. One hundred thirteen sows were used in a split-plot design. From weaning to ovulation sows were fed at two times maintenance either a diet with tallow (Fat) or maize starch plus dextrose (Starch) as the major energy source. From ovulation onward, sows within each dietary group were alternately reassigned to either the Fat or the Starch diet and were fed at 1.25 times maintenance. Estrus detection was performed three times a day from d 3 to 9 after weaning and sows were inseminated each day of standing estrus. On d 35 of pregnancy, the sows were slaughtered and their reproductive tracts were removed. Plasma insulin concentration was higher in sows fed the Starch-rich diet than in sows fed the Fat-rich diet on d 4 after weaning (1.30 vs 0.97 ng/mL, P = 0.08) and on d 32 of pregnancy (1.20 vs 0.51 ng/mL, P < 0.001). Plasma glucose and IGF-I concentration on d 4 after weaning and d 32 of pregnancy did not differ between sows on the two dietary energy sources. The percentage of sows exhibiting estrus within 9 d after weaning was 52 and 67% for the Fat and Starch diet before ovulation, respectively (P = 0.11), whereas the weaning-to-estrus interval was 134 vs 123 h, respectively (P = 0.12). Survival analysis showed that sows fed the Fat-rich diet had a 1.6 times higher risk to remain anestrous until d 9 after weaning than sows fed the Starch-rich diet (P = 0.04). No effect of dietary energy source, either before or after ovulation, on uterine, placental, or embryonal development on d 35 of pregnancy was found. It can be concluded that the dietary energy source provided after weaning can affect the risk of sows to remain anestrous but does not affect uterine, placental, or embryonic traits.lld:pubmed
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pubmed-article:11219451pubmed:pagination420-6lld:pubmed
pubmed-article:11219451pubmed:dateRevised2011-11-17lld:pubmed
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pubmed-article:11219451pubmed:articleTitleEffects of postweaning dietary energy source on reproductive traits in primiparous sows.lld:pubmed
pubmed-article:11219451pubmed:affiliationAdaptation Physiology Group, Wageningen Institute of Animal Sciences, Wageningen University and Research Center, The Netherlands. hvdbrand@schothorst.nllld:pubmed
pubmed-article:11219451pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:11219451pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed