Influence of milk urea on open days period in conventional and organic milk production
2019
Čobanović, Ksenija (https://orcid.org/0000-0003-3810-9602) | Krstović, Saša (https://orcid.org/0000-0001-9347-4886) | Štrbac, Ljuba (Faculty of Agriculture, Novi Sad (Serbia)) | Šaran, Momčilo (Faculty of Agriculture, Novi Sad (Serbia)) | Kučević, Denis (https://orcid.org/0000-0002-1932-7156)
The purpose of this study was to examine possible relationship between milk urea (MU) and fertility of dairy cows using field data. The data were collected from 6 dairy farms, one with organic and five with conventional production, in Vojvodina region. All farms had a free stalls system. Reproductive data and MU measurements were obtained from cows that calved between June 2013 and October 2015 and had a successful conception after calving. Statistical data processing was carried out by applying General Linear Model procedure. Parity, season of milk control, production system and farm were included in the models as fixed effects. Significant differences in MU concentrations and open days interval were observed between farms and between production system (P<0.01), seasons (P<0.01) and parity (P<0.05). Highly significant (P<0.01) positive relationship were found between MU concentration and days open. The cows with the lowest mean MU values (< 10 mg/dl), had the shortest days open interval (63.22 days), but cows with mean MU values between 30.01 – 35.00 mg/dl had the longest day open interval (164.18 days). Results of this study indicate that increased MU levels appear to have a negative effect on dairy cow fertility.
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