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The purpose of this study was to investigate the effect of maternal dietary folic acid (FA) supplementation during gestation on small intestinal development of newborn lambs of different litter sizes, focusing on the intestinal morphology and development-, apoptosis- and digestion-related genes expression. One hundred and twenty Hu ewes ( Ovis aries ) were inseminated and randomly allotted to three groups. One group received a control diet [without FA supplementation, control (CON)] and the other two groups received control diets supplemented with different amount of FA [16 or 32 mg FA per kg dry matter (DM), i.e., F16 and F32] during pregnancy. After lambing, according to the dietary FA levels and litter size (twins, TW; triplets, TR), the neonatal lambs were divided into 6 (TW-CON, TW-F16, TW-F32, TR-CON, TR-F16, TR-F32) treatment groups. The results showed that the ratio of small intestinal weight to live body weight and the thickness of the intestinal muscle layer in the offspring was enhanced significantly with increasing maternal FA supplementation ( p &lt; 0.05). Meanwhile, the expression levels of insulin-like growth factor I ( IGF-I ), B-cell lymphoma-2 ( BCL-2) and sodium/glucose co-transporter-1 ( SGLT1 ) in the small intestines of the newborn lambs were increased, while the opposite was true for Bcl2-associated × ( BAX) in response to FA supplementation ( p &lt; 0.05). Moreover, the small intestinal weights of twins were significantly higher than those of triplets ( p &lt; 0.01), and the expression levels of IGF-I ( p &lt; 0.05), sucrase-isomaltase ( SI) ( p &lt; 0.05) and solute carrier family 2 member 5 ( SLC2A5 ) ( p &lt; 0.01) were significantly lower than those in triplets. These findings suggest that maternal FA supplementation could improve the offspring's small intestinal phenotype and the expression of development-, apoptosis- and digestion-related genes, so it could promote the small intestinal development of newborn lambs. Furthermore, the small intestine phenotypic development of twins was generally better than that of triplets, while the expression levels of the above genes of twins were lower than those of triplets.

animals

Maternal Folic Acid Supplementation Differently Affects the Small Intestinal Phenotype and Gene Expression of Newborn Lambs from Differing Litter Sizes