Control of negative energy balance, productive and reproductive performance in high yielding dairy cows in Slovenia | Procena negativnog bilansa energije, proizvodnih u reproduktivnih sposobnosti krava visokomlečnih rasa u Sloveniji
2011
Podpečan, O., Savinjska veterinarska poliklinika, Žalec (Slovenia) | Zrimšek, P., Veterinarski fakultet, Ljubljana (Slovenia)
The aim of the present paper was to review different diagnostic tools in order to estimate NEB-exposure of Slovenian dairy cows and their productive and reproductive performance. Diagnostic tools such as body condition score (BCS), concentrations of different metabolites, progesterone profiles and milk data records were used and evaluated. Cows with elevated NEFA and BHB levels expressed higher decrease in BCS 30 days postpartum (0.64 vs. 0.33 point; P is less than 0.01), more abnormal progesterone patterns (P is less than 0.001) and had significantly longer interval to first progesterone rise (49.54 vs. 33.82 days; P is less than 0.05) comparing to the animals with normal concentrations. The optimal cut-off value of fat to protein ratio (FPR) at 1.34 provided the best discrimination power according to calving to conception interval (CC) of 120 days. A cut-off value of FPR at 1.1 was selected to enable over 90% correct identification of cows with CC below 120 days. On the other hand, cows with FPR above 1.44 were over 90% correctly identified as cows with CC above 120 days. CC lower than 120 days was observed in 80% of cows with FPR lower than 1.34 and only in 40% of cows with FPR upper than 1.34
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