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The evaluation of fat to protein ratio in milk as an indicator of calving to conception interval in dairy cows using various biostatistical methods

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Author(s): Podpečan O. | Mrkun J. | Zrimšek Petra

Journal: Acta Veterinaria
ISSN 0567-8315

Volume: 60;
Issue: 5-6;
Start page: 541;
Date: 2010;
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Keywords: calving to conception interval | correlation coefficient | dairy cows | fat to protein ratio | ROC analysis | survival analysis

ABSTRACT
The effect of fat to protein ratio (FPR) in milk for the prediction of calving to conception interval (CC) in dairy cows is evaluated using different biostatistics' methods. Spearman rank correlation coefficient, a non-parametric alternative to the Pearson correlation coefficient was used to determine the correlation between reproductive parameters of the herd and the milk data record. In the time interval of 60 to 90 days postpartum the highest correlation was found between FRP and CC (r=0.415, p
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