Abstract To investigate the effects of maternal nutritional plane and selenium (Se) level on offspring muscle development in first parity ewes, Rambouillet ewes (n = 84) were stratified by BW randomized to receive diets formulated contain adequate Se (ASe) or high (HSe) initiated at breeding. On d 40 gestation, assigned randomly within treatments supply 60% (RES), 100% (CON), 140% (HI) NRC requ...