The influence of seasonal on cows milk composition and quality

Object and tasks of work: To analyze and compare the Lithuanian Black and White cows’ milk composition and quality indices and productivity in different months of the year of dairy farm in Kaišiadorys district farmer Tasks: 1. To evaluate the influence of lactating cow productivity. 2. Assess the season on milk composition and quality indicators. 3. Compared to milk composition and quality of grazing and indoor periods. The first stage was carried out literature search, the systematization and analysis. The second stage was carried out research herd milk composition in (percent fat., protein percent., lactose percent. urea percent.) And quality parameters (total bacterial contamination of thousands / ml, somatic cell count in thousands / ml of inhibitory substances in milk freezing temperature indicators of change. The studies were based on data from controlled cows, milk composition analysis and quality indicators. It was calculated the following statistical indexes by using the spreadsheet EXEL and R statistical packet. The studies evaluated 71 Lithuanian Black and White cows. Results and conclusions: 1. On average in 2010. from the farmer's cow after milking herd was 6496 kg and 4.34 percent. fat and 3.66 percent. protein content of milk. 2. Black and White cows productivity increased with each lactation. The highest productivity per cow lactation was III. 6185 kg. It was 34 percent. more than I and 19 percent. higher than in lactation II. 3. Somatic cell count thousands./milion of 14 percent. was higher during the indoor period in comparison with the grazing period. Accordingly, the total bacterial contamination of thousands/milion was 67 percent. higher during the indoor period. 4. Fat content in percent 0,5 (p