Lifetime Production Milk and Milk Fat in Simmental Cows

Abstract

This study was conducted to evaluate the phenotypic expression and variability of lifetime performance traits (lifetime yields of milk, fat and 4%FCM, milk fat content, milk yield per milking day, milk yield per day of productive life and milk yield per day of life) and the effect of systematic factors (breeding region, total lactation number, year of birth and season of birth) and age at first conception on the above traits in 2548 Simmental cows. The test Simmental cows achieved the following: lifetime yields of milk, fat and 4%FCM - 14604, 554.8 and 14157 kg, respectively, milk fat content of lifetime milk yield - 3.81%, milk yield per milking day - 12.79, milk yield per day of productive life - 9.31 and milk yield per day of life - 5.46 kg. The marked variability of the traits, along with a certain percent of high-producing cows, enables further success in their selection.

Ispitivanje fenotipske ispoljenosti i varijabilnosti osobina životne proizvodnje (životna proizvodnja mleka, mlečne masti i 4%MKM, sadržaj mlečne masti kao i proizvodnja mleka po muznom produktivnom i životnom danu) izvršeno je na uzorku od 2548 krava simentalske rase. Na analiziranom uzorku simentalskih krava ostvarena životna proizvodnja mleka, mlečne masti i 4%MKM iznosila je 14604, 554.8 i 14157 kg, sadržaj mlečne masti životne proizvodnje mleka 3.81%, dok je proizvodnja mleka po muznom, produktivnom i životnom danu iznosila 12.79, 9.31 i 5.46 kg. Izražena varijabilnost ovih osobina, sa izvesnim procentom visoko proizvodnih grla, omogućava dalji uspešan rad u njihovoj selekciji.