Abstract
Data on 643 beef bulls were used in order to analyze influence of rearing system or herd of origin on growth traits (average daily gain and body masses) of beef bulls in performance test (Marchigiana, n= 181, Chianina, n=240, Romagnola, n=222). Several fixed or random effects, such as breed, type of rearing or herd of origin, group, parity and twinning, were included in two statistical models. According to rearing system (in stall, on pasture or mixed) it should be pointed out that several different sources of variation for growth traits evince statistical significance. Also, herd of origin represents very significant source of variation for all included traits. The main difference between those two factors (type of rearing system or herd of origin) is that influence of rearing system decreased during the test, while the effect of herd of origin remained until the end of test. It was concluded that the adequate determination of non-genetic sources of variation referring to the pre-test system of rearing might be of crucial importance for ranking potential sires.
Highlights
Data on 643 beef bulls were used in order to analyse influence of rearing system or herd of origin on growth traits of beef bulls in performance test (Marchigiana, n=181, Chianina, n=240, Romagnola, n=222)
(1993): Factors influencing growth performance of beef bulls in a test station
Summary
Sadriaj: U cilju ispitivanja uticaja koji ostvaruje maticna farma, odnosno nacin odgajivanja do zalucenja na osobine porasta tovnih bikova u performans testu. analizirani su rezultati iz testa bikova 3 ita l ijanske, tovne rase. Sadriaj: U cilju ispitivanja uticaja koji ostvaruje maticna farma, odnosno nacin odgajivanja do zalucenja na osobine porasta tovnih bikova u performans testu. Saopstavaju da farma sa koje bik potice predstavlja znacajan izvor fenotipske varijabilnosti za osobine porasta pracene tokom testa. Contiero i sar., (1994, 1995) navode da su bikovi razlicitih italijanskih tovnih rasa odgajani na farmama sa vezanim sistemom drzanja ispoljili tokom perioda pre testa veci dnevni prirast od bikova koji su odgajani slobodno iIi poluslobodno. Smanjenje uticaja maticne farme na osobine porasta pracene tokom performans testa bikova u vecini slucajeva nastaje kao rezultat kompenzatornog rasta koji se ispoljava u uslovima kada standardizovana ishrana u testnoj stanici ornogucava potpuno ispoljavanje genetskog kapaciteta individue,. Imajuci u vidu nesurnnjivu znacajnost pre-testnog nacina drzanja bikova, cilj ovog rada je da se utvrdi uticaj nacina odgajivanja do zalucenja na fenotipsko ispoljavanje varijabilnosti razlicitih osobina porasta u performans testu tovnih bikova. Pravilno determinisanje uticaja koji su u vezi sa pre-testnim nacinom drzanja bikova doprinosi da se forrnulise adekvatan model koji ce se koristiti za procenu komponenti varijanse ekonomski znacajnih osobina i na rangiranje potencijalnili priplodnjaka
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