The variability in the estimated prevalence risk of metabolic disorders (ketosis/acidosis) in simmental first parity cows due to recording season
2021
Poljak, Franjo | Špehar, Marija | Steiner, Zvonimir | Gavran, Mirna | Gantner, Vesna | Škrbić, Zdenka
The purpose of this research was to determine the prevalence risk of subclinical disorders of Simmental first parity cows regarding the recording season. Test-day records of Simmentals collected during the five years (January/2008 – December/2012) given by the Croatian Agricultural Agency were used for the statistical analysis. During the regular milk recording performed monthly following the alternative milk recording method (AT4 / BT4) on dairy cattle farms in Croatia, test-day records were gathered. The highest daily fat content (4.31%) and the highest daily protein content (3.54%) was ascertained in winter. The lowest values of daily fat (3.83%) and protein content (3.33%) were determined in summer period. Additionally, the lowest value of fat to protein ratio (F/P) was observed in summer in amount of 1.16. Higher value of F/P (1.22) was observed in winter period. Further, the study showed that daily fat and protein content, together with F/P ratio significantly, differ due to recording month with the higher values of F/P ratio in winter period indicating higher ketosis prevalence risk, and lower values of F/P ratio in summer period indicating higher acidosis prevalence risk. Mentioned factors should be taken into consideration when predicting the ketosis/acidosis prevalence in dairy cows based on milk recording data because they influence the variability of daily fat and protein content, and therefore the fat to protein ratio along with the prevalence risk of metabolic disorders.
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