Introduction:
Routine use of antibiotics to prevent mastitis in dairy cows is prohibited by organic
farming regulations. Internal Teat Sealers have been proposed as an alternative. We
compared two drying-off (DO) supporting measures (Internal Teat Sealer and Homeopathy)
to an untreated control group to assess their protective effects against clinical
mastitis and intra-mammary infections during dry period of dairy cows.
Methods:
A field trial with 102 dairy cows from 13 Swiss organic dairy farms was conducted.
Cows were randomly assigned to one of three groups within a herd. In the Internal
Teat Sealer group (ITS; 36 cows) cows were treated with the commercial ORBESEAL (Pfizer)
in all four quarters immediately after the last milking. In the Homeopathy group (HDT;
32 cows) the cows were treated per-orally by a herd-specific homeopathic formulation
consisting of two remedies in 1:106 dilution over 5 days before and after DO. The untreated group received no therapy
(U; 34 cows).
Results:
For ITS, HDT and U the clinical mastitis incidence rates for the first 100 days post-calving
were 11%, 9% and 3%, respectively, and the proportion of normally secreting quarters
was (quarter somatic cell count (SCC) [QSCC]<100,000/ml) 70%, 68%, and 65%, respectively.
Power analysis indicates that a proportion of 75% would support the rejection of null
hypothesis in the HDT, and 74% in the ITS group against untreated control. Quarters
of cows with SCC<200,000/ml at DO showed significantly higher normal secretion in
HDT group (odds ratio [OR] 9.69) compared to untreated control, whereas Teat Sealing
lead to an OR of 3.09 (not significant, post hoc power 31.3%).
Conclusions:
Under the studied conditions herd-specific homeopathic dry cow therapy was effective
in increasing the number of animals with normal milk secretion after subsequent parturition,
compared to untreated control. It may be an effective alternative to Teat Sealing,
particularly in animals with relatively low SCCs. Further research is required to
confirm these results, and under different environmental conditions.
Keywords Dry cow therapy - Dairy cow - Mastitis - Teat Sealer - Homeopathy - Organic farming