Abstract #T157

# T157
Perinatal effects of feeding rumen-protected methyl donors to dams on hepatic gene expression in Holstein calves.
C. Bespalhok Jacometo*1, P. Montagner2, Z. Zhou3, F. Lopes4, D. Luchini5, M. Nunes Corrêa2, J. Loor3, 1Universidad de La Salle, Bogotá, DC, Colombia, 2Universidade Federal de Pelotas, Pelotas, RS, Brzsil, 3University of Illinois, Urbana, IL, 4Adisseo SA, São Paulo, SP, Brazil, 5Adisseo NA, Alpharetta, GA.

The aim of this study was to assess the effect of feeding a methionine (MET) or choline (CHO) source to dams on neonatal calf liver expression of genes related to methyl-donor pathways and energy metabolism. The experiment was conducted as a randomized complete block design with 2 × 2 factorial arrangement of MET (Smartamine M, Adisseo NA) and CHO (ReaShure, Balchem Inc.) level (with or without). Eighty Holstein calves born to cows receiving during the last ~4 wk of pregnancy MET (0.08% DMI; n = 20), CHO (60 g/d; n = 20), MIX (MET+CHO; n = 20) or control (CON; n = 20) were evaluated. Immediately after birth calves were separated from the dam, fed first colostrum, housed individually and fed a common milk replacer twice daily. Liver biopsies were harvested (n = 8/group) at 4 d of age for qPCR analysis. Data were analyzed using the MIXED procedure of SAS, with MET and CHO as a fixed effect, and also a methyl donor contrast effect was tested. Both methyl donors upregulated (P < 0.05) the expression of CBS, BHMT and MTR, while they downregulated (P < 0.001) SAHH expression, all of which are related to the one-carbon and methionine pathways and the transsulfuration pathway. MAT2A expression was downregulated (P = 0.05) in liver of MET calves and upregulated (P = 0.02) in CHO calves. Expression of PEMT, MAT1A and CHDH was not affected (P > 0.05) by maternal treatment. Glutathione metabolism enzyme (GCLC and GSR) expression also was not affected by maternal treatment (P > 0.05). Regarding taurine metabolism, maternal supplementation with CHO upregulated (P = 0.05) CSAD hepatic expression, but CDO expression was not affected (P > 0.05). Expression of genes related to carbohydrate metabolism and hepatokines (PC, PCK1, SLC2A2 and FGF21) was not affected by maternal diet (P > 0.05). However, the glucocorticoid receptor was upregulated (P = 0.06) by maternal MET (P = 0.08) or CHO (P = 0.09) but not by their combination (MIX, P = 0.25). Overall, the data suggest that maternal feeding with methyl donors during the last ~4 wk of gestation elicited changes in neonatal calf hepatic gene expression and the response is different according to the methyl donor source.

Key Words: amino acids, fetal programming, nutrigenomics