In order to qualitatively improve the population of dairy cattle, a purposeful and effective work is needed to prolong productive longevity and to increase the lifelong milk yield of cows. According to scientific research on the productive longevity of cows, the biggest influence is exerted by bulls-producers. Therefore, effective selection of dairy cattle in this direction will result from the selection and intensive use of improved bulls, whose descendants are longevity and high life-long milk yield. However, the bulls are evaluated according to the results of the first lactation of their daughters and the evaluation is obtained at the age of 5,5–6 years. Taking into account the productive longevity of daughters will prolong the term for determining the breeding value of bulls for another 6–7 years. The aim of the research was to study the possibility of early forecasting the probable breeding value of bulls for productive longevity and lifelong milking of daughters by using indirect signs. The studies were carried out by analyzing the data of the pedigree registration of the left cows in black-and-white varieties in the conditions of the Semenovsky breeding factory of the Republic of Mari El. As an indirect indicator for predicting lifelong milk yield of daughters of bulls, the average milk yield for 305 days of 1 st and 3 rd lactation, productive longevity – the indicator of survival (survival) of the daughters of bulls evaluated before the completion of the third lactation was used. As a result of the studies, the negative correlation of milk yield for the 1st lactation with duration of productive life and lifetime milk yield (r = –0,930 and –0,922) was revealed and the positive relationship of lifelong milk yield and productive longevity of daughters with milk yield for the 3rd lactation (r = 0,492 and 0,225). High and statistically reliable were the coefficients of rank correlation between the daughters' livability indicators at the end of 3–4 lactation and the total values of their life expectancy and lifelong milk yield (rs = from 0,92 to 0,96). Thus, it is possible to conduct additional, more precise assessment of bulls-producers in relation to lifelong milking of daughters. To do this, it is necessary to take into account the level of productivity of daughters for the third lactation and to use the indicator of safety of daughters after the completion of the third lactation.