Chemical Composition of Milk Obtained from Holstein Friesian Cows during First and Second Lactation

In this study milk samples from Holstein Friesian cows were collected and analyzed during the first and second lactation period in a period of six months. The following parameters have been examined: protein content, fat content, lactose, and dry matter in milk. The average values of the content of milk protein, fat, lactose and dry matter in the milk of first lactation were as following: 3,14%, 3,25%, 4,46 %, 11,48% and in the milk of second lactation are: 3,21%, 3,29%, 4,39% and 11,68%.%. Milk from cows in the second lactation had a higher concentration of protein, more fat and dry matter than cow's milk from the first lactation. Keywords: quality, chemical composition, milk, lactation, breeds.