The age of preparing the young cattle for reproduction and also cattle production and reproduction performances
depending on the age of the first insemination, the main reproductive indices of cows and the influence of the season on
the main reproductive indices in the studied population of cattle was studded. The investigations have been performed
in terms of producing activity of the cattle breeding farm of the Moldova’s south districts, using a group of Black
Spotted cattle breed population of Moldavian “south” subtype. It wasn’t established a regularity of the influence of the
first insemination age on the reproductive indices and milk productivity level of the primiparous heifers of the Black
Spotted cattle breed of Moldavian “south” subtype. The reduction of cow reproductive indices takes place only when
milk productivity level exceeds 7000 kg per normal lactation compared with the maximum allowed requirements. The
length of the service-period increased by 46,25%; The length of the calving interval increased by 3,97%; The
coefficient of cow reproductive capacity decreased by 1 %. The value of the main reproductive indices of the studied
group of cows manifested specific features depending on the season: The intensity of estrum manifestation prevails in
the spring-summer period and constitutes 69,57% of the total females in heat during the year; The length of the serviceperiod
exceeds the maximum allowed requirements in the autumn-winter period; The best results of female fecundity
have been established in the autumn and spring periods.