Tag Archives: milk urea nitrogen

553–564 D. Ruska, D. Jonkus and L. Cielava
Monitoring of ammonium pollution from dairy cows farm according of urea content in milk
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Monitoring of ammonium pollution from dairy cows farm according of urea content in milk

D. Ruska*, D. Jonkus and L. Cielava

Latvia University of Agriculture, Faculty of Agriculture, Liela str. 2, LV-3001 Jelgava, Latvia
*Correspondence: diana.ruska@llu.lv

Abstract:

The objective of this study was to evaluation of urea content in milk to assess the potential of ammonia pollution from farms. Dairy cows in farms were located in different Latvia region with different holding system. Research was conducted under production conditions in four different agricultural holdings located in various places of Latvia and represent different animal housing and feeding technologies. Monthly together with herd control was recorded milk yield and take milk samples was analysed for fat, total protein and lactose (%), urea content (mg dL-1) and somatic cell count (SCC). Milk content parameters for total 14,873 milk samples were analysed in accredited milk quality laboratory. The statistical analyses were performed with the SPSS program package. The results acquired show that in three farms (A, B and D) urea content in 59–71% of milk samples comprised 15.1–30.0 mg dL–1. However, also in these holdings urea content in 29–41% of samples was below or above the optimum threshold. Unpleasant situation was observed in holding C; there urea content only in 16% of milk samples was within the optimum limits. Calculations of forecasted ammonium pollution emitted daily from agricultural holdings using tie stall housing may comprise 91.4–104.0 g from cow, while amount emitted by freestall holdings using housing may constitute 93.9–95.9 g from cow daily. By using these data, each farm may make calculations and forecast farming efficiency and environmental threats.

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