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This Article Full Text (PDF) All Versions of this Article: jas.2007-0837v1 87/2/669    most recent Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Carlson, D. B. Articles by Caton, J. S. Search for Related Content PubMed PubMed Citation Articles by Carlson, D. B. Articles by Caton, J. S.

Effects of dietary selenium supply and timing of nutrient restriction during gestation on maternal growth and body composition of pregnant adolescent ewes

D. B. Carlson^*, J. J. Reed^*, P. P. Borowicz^*, J. B. Taylor, L. P. Reynolds^*, T. L. Neville^*, D. A. Redmer^*, K. A. Vonnahme^* and J. S. Caton^*

^* Center for Nutrition and Pregnancy, Department of Animal and Range Science, North Dakota State University, Fargo, ND 58105 USDA-ARS, U. S. Sheep Experiment Station, Dubois, ID 83423

joel.caton{at}ndsu.edu

Abstract

The objectives were to examine effects of dietary Se supplementation and nutrient restriction during defined periods of gestation on maternal adaptations to pregnancy in primigravid sheep. Sixty-four pregnant, Western Whiteface ewe lambs were assigned to treatments in a 2 x 4 factorial design. Treatments were dietary Se [adequate Se (ASe; 3.05 µg/kg BW) vs. high Se (HSe; 70.4 µg/kg BW)] fed as Se-enriched yeast, and plane of nutrition [control (C; 100% of NRC requirements) vs. restricted (R; 60% of NRC requirements]. Selenium treatments were fed throughout gestation. Plane of nutrition treatments were applied during mid (d 50 to 90) and late gestation (d 90 to 130), which resulted in 4 distinct plane of nutrition treatments (CC, RC, CR, and RR). All of the pregnant ewes were necropsied on d 132 ± 0.9 of gestation (length of gestation 145 d). Nutrient restriction treatments decreased ewe ADG and G:F, as a result, RC and CR ewes had similar BW and maternal BW (MBW) at necropsy, whereas RR ewes were lighter than RC and CR ewes. From d 90 to 130, the HSe-CC ewes had greater ADG (Se x nutrition; P = 0.05) than did ASe-CC ewes, whereas ADG and G:F (Se x nutrition; P = 0.08) were less for HSe-RR ewes compared with ASe-RR ewes. The CR and RR treatments decreased total gravid uterus weight (P = 0.01) as well as fetal weight (P = 0.02) compared with RC and CC. High Se decreased total (g; P = 0.09) and relative heart mass (g/kg MBW; P = 0.10), but increased total and relative mass of liver (P 0.05) and perirenal fat (P 0.06) compared with ASe. Total stomach complex mass was decreased (P < 0.01) by all the nutrient restriction treatments, but was reduced to a greater extent in CR and RR compared with RC. Total small intestine mass was similar between RC and CC ewes, but was markedly reduced (P < 0.01) in CR and RR ewes. The mass of the stomach complex and the small and large intestine relative to MBW was greater (P = 0.01) for RC than for CR ewes. High Se decreased jejunal DNA concentration (P = 0.07), total jejunal cell number (P = 0.03), and total proliferating jejunal cell number (P = 0.05) compared with ASe. These data indicate that high dietary Se affected whole-body and organ growth of pregnant ewes, but the results differed depending on the plane of nutrition. In addition, the timing and duration of nutrient restriction relative to stage of pregnancy affected visceral organ mass in a markedly different fashion.

Key Words: fetal • maternal • nutrient restriction • pregnancy • selenium