Evaluation of cow's energy status changes during early lactation based on the concentrations of organic milk ingredients
2015
Savić, Đorđe (Faculty of Agriculture, Banja Luka, Republic of Serbska (Bosnia and Herzegovina)) | Jotanović, Stoja (Faculty of Agriculture, Banja Luka, Republic of Serbska (Bosnia and Herzegovina)) | Stančić, Ivan (Faculty of Agriculture, Novi Sad (Serbia). Department of Veterinary Medicine) | Pračić, Nermin (Biotechnical faculty, Bihać (Bosnia and Herzegovina)) | Vekić, Marinko (Faculty of Agriculture, Banja Luka, Republic of Serbska (Bosnia and Herzegovina))
The aim of the study was to evaluate the energy status of cows (n=132) based on the concentration of organic milk constituents during early lactation. Cows were divided into three groups according to the stage of lactation (group A, n=43, 15-30 DIM; group B, n=33, 31-45 DIM; group C, n=56, 46 to 60 DIM). Concentrations of milk fat and protein and the milk fat: protein ratio tended to decrease, and the concentration of urea had increased towards to the end of the evaluated period. Statistically significant differences were found in concentrations of milk fat (41.58±37.15 vs. 37.15±3.63 and 36.11±4.57 g/L, respectively), urea (2.86±0.50 vs. 3.48±0.69 and 3.61±0.56 mmol/L, respectively) in all three groups, and milk fat : protein ratio in the group A compared to the other two groups, and also in lactose concentration between groups A and B (47.14±01.29 vs. 47.71±1.4 g/L). The ratio of the concentration of milk fat and protein, as well as relations between urea and protein showed a strong energy deficit in all tested cows, with more or less pronounced deficit or relative surplus of protein. Such condition negatively affects health status and milk production of evaluated cows, as well as their reproductive performance.
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