A simulation of index selection was carried out for improvement of sheep mammary gland health and productivity, especially in terms of lamb rearing results. Selection indices were elaborated using the DZUPLAN program. These indices included different configurations of production record, somatic cell count in milk (as an indicator of mammary gland health) and selected morphological traits of udder and teats. The simulation of index selection was carried out based on these indices, together with an examination of the genetic effects of selection. Additionaly, the correlated response in daily gain of lambs was estimated from birth to weaning. The results obtained clearly indicate that taking udder morphological traits into consideration in sheep breeding programmes can result not only in the improvement of ewe fertility and udder health but also in an increased growth rate of their progeny.