Volume 10(2), 2011

Abstract. The effect of somatic cell count on the amount of daily milk yield and chemical composition of milk from 662 cows kept on 25 farms located in the region of southern Podlasie was analysed. A total of 5061 milk samples were evaluated. They were divided into four classes corresponding to the content of somatic cells in 1 ml of milk: <200,000; 201,000–400,000; 401,000–1,000,000; >1,000,000. It was found that, with an increase in the somatic cell count in 1 ml of milk, there was an increase in milk protein content from 3.36% to 3.54% and milk fat content from 4.02% to 4.16%, whereas the content of casein and dry matter in milk decreased from 2.56% to 2.45% and from 13.13% to 12.98%, respectively. Moreover, the percentage of casein in milk protein decreased from 76.2% to 69.2%. Also, milk yield was reduced, and the calculated losses in the milk yield resulting from an increase in the SCC were 10.6 to 17.3%.

Abstract. An analysis chemical composition of 33 samples of five cereal grains harvested in oneyear led to a conclusion that the greatest variations and statistically significant differences (P≤0.01) among cereals existed in their content of crude protein, crude fibre and the following fractions of dietary fibre: NDF,ADF, TDF, IDF and SDF.Analyzed winter wheat and winter rye varieties differ significantly (P≤0.01) from other cereal grains in their content of magnesium, potassium, sodium, phosphorus, manganese, zinc and show a statistically significant difference (P≤0.05) in the content of calcium and copper. The average total content of amino acids was highest in wheat and lowest in winter barley. Lysine was found to be the first amino acid limiting (CS) the quality of protein in all analyzed varieties of cereal grains, with the exception of rye, while tryptophan was found to be such an amino acid for animals (WE). The high content of essential amino acids (EAA) was reflected in EAAI, which forWH ranged from 71% (spring barley) to 84% (winter triticale), and forWE from 51% (winter barley) to 60% (winter triticale).