Impact of Major Non-Genetic Factors on Phenotypic Variability of Milk Production Traits in the Black And White Cattle Population
Uticaj važnijih negenetskih faktora na fenotipsku varijabilnost osobina mlečnosti u populaciji crno belih goveda
Author
Popovic, Nikola
Beskorovajni, Radmila
Stanojevic, Dragan
Keywords
milk yieldphenotypic variability
non-genetic factors
black-and-white cattle
mlečnost
fenotipska varijabilnost
negenetski faktori
crno bela goveda
Metadata
Show full item recordAbstract
Modern beef production in intensive rearing conditions imposes a need for constant
improvement of production traits of individuals. Meeting the growing requirements that
accompany this type of production means the provision of optimal rearing conditions,
not only in terms of cattle nutrition, care and housing but also in terms of health.
Milk yield, milk fat and protein are properties of primary importance in dairy cattle
breeding. These properties express a pronounced variability that occurs due to a large
number of factors. The paper presents the average values and phenotypic variability of
major milk production traits in the black-and-white cattle population raised on the farm
"PK Beograd". In the first three standard lactations the average milk yield was 7.241 kg
with 3.56% fat. The impact of major non-genetic factors (farm, year, season of calving)
on the expression of milk production traits was also observed. The impact of the
examined factors on the variability of the production traits was highly significant (P
<0.01). Savremena govedarska proizvodnja u intenzivnim uslovima odgajivanja
nameće potrebu konstantnog unapređenja proizvodnih osobina jedinki. Realizacija sve
većih zahteva koji prate ovu proizvodnju podrazumeva obezbeđenje optimalnih uslova
gajenja, kako u pogledu ishrane, nege i smeštaja, tako i zdravstvenog stanja goveda.
Prinosi mleka, mlečne masti i proteina su osobine od primarnog značaja u selekciji i
oplemenjivanju mlečnih rasa goveda. Ove osobine pokazuju izraženu varijabilnost koja
se javlja usled delovanja velikog broja činilaca na njihovu ispoljenost. U radu su
prikazane prosečne vrednosti i fenotipska varijabilnost važnijih osobina mlečnosti u
populaciji crno belih goveda gajenih na farmi PK “Beograd”. U prve tri standardne
laktacije ostvaren je prosečan prinos od 7241 kg mleka sa 3,56% mlečne masti.
Posmatran je i uticaj važnijih negenetskih faktora (farme, godine, sezone teljenja) na
ispoljenost osobina mlečnosti. Ustanovljen je visoko značajan uticaj ispitivanih faktora
na varijabilnost posmatranih proizvodnih svojstava (P< 0.01).