The effect of dietary restriction, pregnancy, and fetal type in different ewe types on fetal weight, maternal body weight, and visceral organ mass in ewes

Journal of Animal Science
A N ScheafferL P Reynolds

Abstract

Our objectives were to evaluate maternal body changes in response to dietary restriction or the increased nutrient requirement of fetal growth. In Exp. 1, 28 mature crossbred ewes (61.6 +/- 1.8 kg initial BW) were fed a pelleted forage-based diet to evaluate effects of pregnancy and nutrient restriction on visceral organ mass. Treatments were arranged in 2 x 3 factorially, with dietary restriction (60% restriction vs. 100% maintenance) and reproductive status (nonpregnant [NP], d 90 or d 130 of gestation) as main effects. Dietary treatments were begun at d 50 of gestation, and restricted ewes remained at 60% of maintenance throughout the experiment. Nonpregnant and d-90 ewes were fed dietary treatments for 40 d and slaughtered. The d-130 ewes were fed dietary treatments for 80 d and then slaughtered. In Exp. 2, four Romanov ewes were naturally mated (Romanov fetus and Romanov dam; R/ R), and two Romanov embryos were transferred to each of four Columbia recipients (Romanov embryos and Columbia recipient; R/C). Three Columbia ewes were naturally mated (Columbia fetus and Columbia recipient; C/C). In both experiments, maternal organ weights were reported as fresh weight (grams), scaled to empty body weight (EBW; grams per kilogram...Continue Reading

References

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Citations

Feb 14, 2006·The Journal of Physiology·Lawrence P ReynoldsThomas E Spencer
Apr 25, 2015·Journal of Animal Science and Biotechnology·Kathrin A DunlapM Carey Satterfield
May 1, 2007·Animal : an International Journal of Animal Bioscience·E GootwineF W Bazer
Feb 13, 2009·Reproduction in Domestic Animals = Zuchthygiene·S-Y XuG Zhang
May 19, 2020·Placenta·Ashley K EdwardsM Carey Satterfield

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