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The use of antibiotics in Swiss veal production is considered an established method for controlling bacterial infectious diseases. Although the veterinary profession aims to ensure animal welfare, the veterinary business income needs to be ensured at the same time. Against the background of increasing problems with resistant pathogens in human and veterinary medicine, the use of antibiotics should be significantly reduced and used more selectively. The associated economic consequences for food animal practitioners are unknown. The aim of this study was to determine the economic importance of antibiotic sale volume for private food animal practitioners in veal production. An anonymized questionnaire was sent to 120 mixed veterinary practices in Switzerland, which offered services to veal and beef cattle farmers. Questions involved the pharmaceutical sale volume, details on veterinary invoices from three farms with average, below and above average animal health throughout 2017. Twenty-nine complete questionnaires (response rate: 24.2%) and veterinary invoices of 84 farms were returned. The study is not representative, but it allows a rough assessment of the economic framework in Swiss livestock practice. The majority of the total turnover with livestock farms was generated by the sale of antibiotics (54%). Antibiotic sales per animal were higher as expected in farms with a below-average animal health than in farms with an average or above-average animal health. Consulting services turnover contributed only 0.5% to the total sale volume in veal farming. The results document, that antibiotic reduction measurements in veal and beef production will have economic consequences for veterinary livestock practices. In the medium term, the profitable existence of livestock veterinary practice requires a change to cost based consulting services.

Particle passage from the reticulorumen (RR) depends on particle density and size. Forage particle density and size are related and change over time in the RR. Particle density mainly influences sorting in the reticulum, whereas particle size influences particle retention in the fibre mat of stratified rumen contents (‘filter-bed’ effect). We investigated these effects independently, by inserting plastic particles of different sizes (1, 10 and 20mm) and densities (1·03, 1·20 and 1·44 mg/ml) in the RR of cattle (Bos primigenius f. taurus) as a pilot study, and of muskoxen (Ovibos moschatus; n 4) and moose (Alces alces; n 2) both fed two diets (browse and grass). Faeces were analysed for plastic residues for 13 d after dosing to calculate mean retention times (MRT). The results confirmed previous findings of differences in absolute MRT between species. Comparing muskoxen with moose, there was no difference in the effect of particle density on the MRT between species but particle size had a more pronounced effect on the MRT in muskoxen than in moose. This indicated a stronger ‘filter-bed effect’ in muskoxen, in accord with the reports of stratified RR contents in this species v. the absence of RR content stratification in moose. Low-density particles were retained longer in both species fed on grass diets, indicating a contribution of forage type to the ‘filter-bed effect’. The results indicate that retention based on particle size may differ between ruminant species, depending on the presence of a fibre mat in the RR, whereas the density-dependent mechanism of sedimentation in the RR is rather constant across species.