Reproductive characteristics of Simmental breed bull dams

Abstract

Cattle reproduction is most significant production phase because in this phase heads of cattle for maintaining of the herd are provided, as well as for dairy production and fattening - production of meat. The effect of year and season of calving on age at first conception, duration of pregnancy duration of service period, interval between calving, etc. is investigated in the paper. Bull dams of Simmental breed selected on farms of individual agricultural producers were investigated. The method of Least Squares LSMLMW(Harvey 1987) was used for analysis of the effect of year and season of calving on reproductive traits. Year of calving had significant effect on duration of service period and interval between calving (p (lt) 0.05), while season influenced significantly only the duration of service period (p (lt) 0.05). Mean values of the general average were following: for age at first conception - 517.61 days; duration of pregnancy 285.51 days; duration of service period 108.98 days; duration of interval between calving 395.34 days.

Ispoljenost reproduktivnih osobina bikovskih majki simentalske rase bila je na zadovoljavajućem nivou. U daljem odgajivačko-selekcijskom radu treba nastojati da se omogući dobijanje jednog teleta godišnje. Opšti prosek sredine najmanjih kvadrata osobina plodnosti iznosio je za uzrast pri prvoj oplodnji 517.61 dana,trajanje bremenitosti 285.51 dana, trajanje servis perioda 108.98 dana, dužina međutelidbenog intervala 395.34 dana. Godina telenja statistički je značajno uticala na trajanje servis perioda i dužinu međutelidbenog intervala (P (lt) 0,05), za razliku od uzrasta pri prvoj oplodnji i trajanje bremenitosti na koje nije imala značajan uticaj (P>0,05). Sezona telenja imala je signifikantan uticaj samo na trajanje servis perioda (P (lt) 0,05), dok na ostale ispitivane parametre plodnosti nije imala značajnijeg uticaja (P>0,05).