Urea Content and Milk composition in Sheep from the Bulgarian Milk Breed Synthetic population

Milena Mihaylova, Nedka Dimova, Daniela Miteva

Abstract: The aim of the study is to investigate the relationship between the level of urea in milk and its composition and its dependence on the lactating stage in sheep from the Bulgarian Milk Synthetic Population. The study included 32 sheep of the Synthetic Bulgarian Milk Breed population from the Agricultural Institute - Stara Zagora herd in 2015. Monthly controls from the 60th day to the end of lactation were followed. Dairy samples were taken individually for each animal and analyzed for fatty substances, protein, lactose and urea in the laboratory of the IA - Stara Zagora. The urea content was determined according to the method described by Angelov, Ibrisimov, Milashki (1999), based on the urease Conway cup method. The milk quality was determined by Ekomilk Total ultrasonic milk analyzed. From this study we can draw the following conclusions: The stage of lactation reliably influences the level of average daily milk, fat and urea in milk. The average daily milk, protein and fat levels are poorly correlated with the level of urea in milk in sheep.

Keywords: milk quality; sheep; urea

Date published: 2019-05-09