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The incidence of postpartum diseases - ketosis, acidosis, depending on which condition and structure of the of rations in transition
Bubnová, Zuzana ; Hučko, Boris (advisor) ; Jiří, Jiří (referee)
This thesis formed on the observation of the influence of body condition score (BCS) before calving on the prevalence of ketosis after calving and the structure of mixed ration on prevalence of rumen acidosis in production herd.
This thesis was made on the farm AGROBOS Ltd. in Slatina where 165 cows are raised. 25 cows and 10 heifers were assessed in dry period and whole herd of dairy cows in the production hall was monitored for performance (PM).
Body condition score of cows and heifers was assessed in the period before calving on a five point scale with resolution of 0.25 points. Blood samples were taken from them from the base of the tail after calving. The concentration of betahydroxybutyrate (BHB) was monitored in blood at first to fourth days after calving using FreeStyle Optimum NEO. The structure of mixed ration in the production hall was evaluated using Penn State separator. The fat protein ratio from the PM system MOOML was observed and evaluated for incidence of chronic rumen acidosis.
The measured values of BHB, the structure of the diet and the fat - protein ratio values were compared with the recommended values. As a criterium for a healthy state, the BHB concentration of 1.4 mmol / l was selected. The rumen acidosis limit for the fat protein ratio was set at 1.1. A lower fat protein ration was designated as ruminal acidosis. The suggested ration amounts for cows have been adjusted based on a grain mixture which was separately administered to dairy farms by the milking robot.
Ketosis was detected in 83 % of cows on the second or higher lactation of which 9.5 % had higher condition before calving, so 3.75 point or higher. All evaluated heifers suffered ketosis after calving and 70 % had elevated condition before calving.
The structure of the mixed ration had the highest deviations in proportions of large particles on upper sieve of separator. Up to 50 % of the particles for a mesh size of 19 mm were found.
The average fat protein ratio was 1.12 in the whole herd. Cows, which was measured for BHB and subsequently monitored in performance during first lactation, had in the first period the average proportion of fat - protein ratio of 1.09, suggesting that the heifers on average suffered from ruminal acidosis in early lactation. Cows at second and higher lactation had in the first month of performance the average ratio of fat and protein of 1.17.
Measured values: BCS and BHB; F/P and structure of mixed ration were statistically evaluated using correlation. But we have not confirmed of dependence on one production illness.
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