TY - JOUR
T1 - Maternal selenium supplementation and timing of nutrient restriction in pregnant sheep
T2 - Effects on maternal endocrine status and placental characteristics
AU - Lekatz, L. A.
AU - Caton, J. S.
AU - Taylor, J. B.
AU - Reynolds, L. P.
AU - Redmer, D. A.
AU - Vonnahme, K. A.
PY - 2010/3/1
Y1 - 2010/3/1
N2 - To determine the effects of maternal Se intake and plane of nutrition during midgestation, late gestation, or both on hormone and metabolite concentrations in the dam and on placental characteristics, pregnant ewe lambs (n = 64) were assigned to 1 of 8 treatments arranged in a 2 × 2 × 2 factorial array: Se level [initiated at breeding; adequate (3.05 μg/kg of BW) or high (70.4 μg/kg of BW)] and nutritional level [100% (control) or 60% (restricted) of NRC recommendations] fed at different times of gestation [d 50 to 90 (midgestation) or d 91 to 130 (late gestation)]. The control ewes had a greater (P = 0.01) percentage change in BW from d 50 than restricted ewes during both mid-and late gestation. Although blood urea N was not affected by either Se or nutritional level, restricted ewes had greater (P = 0.01) concentrations of circulating Se on d 66, 78, 106, 120, and 130 of gestation compared with control ewes. Both Se and timing of the nutritional level affected circulating progesterone; however, only nutritional level affected thyroxine and triiodothyronine concentrations in the dam. Nutrient restriction during late gestation decreased (P ≤ 0.01) fetal BW and fetal fluid weight compared with the control ewes (3.75 vs. 4.13 ± 0.10 kg and 1.61 vs. 2.11 ± 0.11 kg). Although neither Se nor nutritional level affected (P ≥ 0.1) placental, caruncular, or cotyledonary weights, cotyledonary cellular proliferation was decreased (P < 0.05) in ewes receiving a high concentration of Se compared with those receiving adequate Se. In addition, either Se or nutritional level affected vascular endothelial growth factor (VEGFA), VEGFA-receptor 1, VEGFA-receptor 2, and NO synthase mRNA abundance in the cotyledonary tissue. In the caruncular tissue, either Se or nutritional level affected VEGFA-receptor 1, placental growth factor, and NO synthase mRNA abundance. Selenium supplementation and the duration or timing of nutrient restriction appear to influence the endocrine and metabolic status of the ewe, which may influence nutrient transport and placental function.
AB - To determine the effects of maternal Se intake and plane of nutrition during midgestation, late gestation, or both on hormone and metabolite concentrations in the dam and on placental characteristics, pregnant ewe lambs (n = 64) were assigned to 1 of 8 treatments arranged in a 2 × 2 × 2 factorial array: Se level [initiated at breeding; adequate (3.05 μg/kg of BW) or high (70.4 μg/kg of BW)] and nutritional level [100% (control) or 60% (restricted) of NRC recommendations] fed at different times of gestation [d 50 to 90 (midgestation) or d 91 to 130 (late gestation)]. The control ewes had a greater (P = 0.01) percentage change in BW from d 50 than restricted ewes during both mid-and late gestation. Although blood urea N was not affected by either Se or nutritional level, restricted ewes had greater (P = 0.01) concentrations of circulating Se on d 66, 78, 106, 120, and 130 of gestation compared with control ewes. Both Se and timing of the nutritional level affected circulating progesterone; however, only nutritional level affected thyroxine and triiodothyronine concentrations in the dam. Nutrient restriction during late gestation decreased (P ≤ 0.01) fetal BW and fetal fluid weight compared with the control ewes (3.75 vs. 4.13 ± 0.10 kg and 1.61 vs. 2.11 ± 0.11 kg). Although neither Se nor nutritional level affected (P ≥ 0.1) placental, caruncular, or cotyledonary weights, cotyledonary cellular proliferation was decreased (P < 0.05) in ewes receiving a high concentration of Se compared with those receiving adequate Se. In addition, either Se or nutritional level affected vascular endothelial growth factor (VEGFA), VEGFA-receptor 1, VEGFA-receptor 2, and NO synthase mRNA abundance in the cotyledonary tissue. In the caruncular tissue, either Se or nutritional level affected VEGFA-receptor 1, placental growth factor, and NO synthase mRNA abundance. Selenium supplementation and the duration or timing of nutrient restriction appear to influence the endocrine and metabolic status of the ewe, which may influence nutrient transport and placental function.
KW - Angiogenic factor
KW - Maternal nutrition
KW - Placenta
KW - Selenium
KW - Sheep
UR - http://www.scopus.com/inward/record.url?scp=77649112232&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77649112232&partnerID=8YFLogxK
U2 - 10.2527/jas.2009-2152
DO - 10.2527/jas.2009-2152
M3 - Article
C2 - 19933425
AN - SCOPUS:77649112232
SN - 0021-8812
VL - 88
SP - 955
EP - 971
JO - Journal of animal science
JF - Journal of animal science
IS - 3
ER -