ISSUE FOCUS 28 FEED & ADDITIVE MAGAZINE May 2025 FIELD TRIAL II The next field trial took place on a Czech dairy farm with about 500 Czech Simmental cows. The aim was to test the influence of the TB on milk yield, milk ingredients and SCC under a moderate field contamination with mycotoxins. The TMR analysis showed contamination with 700 ppb DON and 190 ppb ZEA and the farmer, being used to higher inclusion rates for such products, insisted on double the recommended dosage of 25 g to 50 g TB per cow and day. The product was used for a duration of 8 weeks and the results of the monthly milk testing, which records milk yield, ingredients and SCC, were used for the evaluation. Figure 2 shows the temporal development of the parameters over the test months (green bars) as well as 4 months before and one month after product application (grey bars). Under the use of the TB, milk yield increased while SCC was reduced compared to the months without product use. Taking into account the milk fat and protein contents monitored in parallel, it was also possible to calculate the energy corrected milk (ECM), showing as well a clear economical advantage for the farmer. After deducting the product costs, the farm was left with an average additional income of more than 100 € per day. FIELD TRIAL III The positive results obtained in Germany and Czeck Republic were confirmed by a further field experience on a dairy farm in Northern Ireland. The farm with around 200 Holstein Friesian lactating cows faced an unusual drop in performance, which was accompanied by an increased SCC and mastitis incidence as well as a reduced appetite in the cows. The mycotoxin analysis of the TMR revealed only a low contamination of approx. 200 ppb DON and the cows received a dosage of 25 g TB per head and day over an observation period of eight weeks. Jan 19th 28.14 29.18 32 30 28 26 24 22 20 [kg/cow/day] 28.85 29.16 Milk Yield 30.25 30.83 30.11 Feb 21st Mar 22nd Apr 19th May 18th Jun 21st Jul 19th Jan 1 234 [x1000/ml] 250 200 150 100 50 0 Jan 19th 28.14 29.18 32 30 28 26 24 22 20 [kg/cow/day] 28.85 29.16 Milk Yield 30.25 30.83 30.11 Feb 21st Mar 22nd Apr 19th May 18th Jun 21st Jul 19th Jan 19th Feb 21st Mar 22nd Apr 19th May 18th Jun 21st Jul 19th Somatic Cell Counts 234 207 230 250 187 199 233 [x1000/ml] 250 200 150 100 50 0 Energy Corrected Milk (ECM) [kg/cow/day] 32 30 28 26 24 22 20 Jan 19th Feb 21st Mar 22nd Apr 19th May 18th Jun 21st Jul 19th 29.17 30.44 29.9 29.9 30.6 31.43 29.85 Figure 2. Temporal development of parameters; trial months marked in green colour
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