Study Regarding the Influence of Activity Period of Cows on Milk Production Indices in the Romanian Black and White Breed

Abstract

The aim of the study was to assess if there are significant differences of milk production between the Romanian Black and White cow populations activating in different periods of time in Timiş and Caraş-Severin. Studies were carried out on 3764 lactations, of which 1290 lactations from active cows after year 2007 and 2474 lactations from cows that ended their productive life before year 2007. In Timiş County, the milk production per normal lactation of active cows was 4676.4 kg milk, with 183.83 kg butterfat and 150.46 kg protein, being significantly higher than the milk production of previous population by 6-7% (p0.05) compared with the productions of previous population. It was concluded that the rearing conditions in the two counties had an effect on phenotypic expression of milk production.

Keywords

• active population
• cows
• milk production
• previous population
• romanian black and white