Dairy mastitis prevention with selective dry-cow therapy, internal teat sealants and bacteriocin (nisin) teat disinfection

Replaces: routine antibiotic dry-cow tubes in every quarter of every cow · Species: dairy cattle · Evidence: high

The chemical problem#

Blanket dry-cow therapy (BDCT) means every quarter of every cow receives a long-acting antibiotic at drying-off, even when most cows (often 60–80 % in well-managed herds) are uninfected. BDCT is one of the largest uses of antibiotics on dairy farms, and often includes 3rd/4th-generation cephalosporins, which the WHO lists as highest-priority critically important for humans. Since 2022 the EU has banned routine prophylactic antibiotic use (Regulation (EU) 2019/6). The Netherlands introduced selective dry-cow therapy in 2013 and cut its total veterinary antibiotic sales by about 70 % (all species) without a rise in mastitis.

Product overview#

1. Selective dry-cow therapy (SDCT): only cows or quarters with an infection (high somatic cell count, clinical mastitis history or culture-positive) get antibiotics. Uninfected cows get only:
2. An internal teat sealant (ITS): an inert bismuth subnitrate paste that forms a physical keratin-like plug in the teat canal and prevents new infections during the dry period.
3. Bacteriocin-based teat disinfection: nisin (a bacteriocin produced by Lactococcus lactis fermentation, a food preservative, E234) teat wipes or dips kill Staphylococcus aureus and Streptococcus spp. on teat skin, a bio-based alternative to iodine or chlorhexidine dips.
4. Supporting measures: mastitis vaccines (e.g. E. coli J5 core antigen, S. aureus bacterin), milking hygiene, bedding management, culling chronically infected cows.

Active ingredient / Composition#

• ITS: bismuth subnitrate 65 % in a paraffin base (non-antibiotic).
• Nisin: lantibiotic peptide from Lactococcus lactis.
• Selection tools: monthly SCC milk recording, California Mastitis Test (CMT), on-farm culture.

Key facts#

Advantages#

• Meta-analyses: SDCT with ITS gives the same (non-inferior) udder health outcomes as blanket therapy in low-SCC cows.
• ITS alone reduces new dry-period infections by about 25–50 % compared with no treatment.
• Lower antibiotic cost, fewer residue violations, and farm antibiotic benchmarks improve (processors increasingly demand this).
• Nisin is a food-grade, fermentation-derived antimicrobial peptide; bacteria rarely become resistant to it.

Mode of action#

• ITS: fills the teat cistern and canal and blocks entry of environmental bacteria until calving.
• Nisin: binds lipid II, forms pores in Gram-positive bacterial membranes and inhibits cell-wall synthesis.
• Selection avoids exposing uninfected quarters to antibiotics (no resistance selection pressure).

Application#

Limitations#

• Requires reliable SCC recording and trained staff (infusion hygiene).
• In herds with high contagious mastitis (S. aureus, Strep. agalactiae) or high bulk-tank SCC, fix the herd problem first.
• Nisin teat products are less widespread; availability varies by country.

Evidence of displacement — D2: measurable displacement (minority share)#

Assessment (hand-reviewed): Italy: 67% of surveyed farmers dropped or cut antibiotic dry-cow therapy — a survey sample, not a national census.

Figures found (verified as quoted, but the assessment above explains why they do not count as displacement evidence for this substitution):

• displacement — In Italy, 67% of surveyed farmers (representing 60% of cows) had already adopted dry cow treatment protocols that eliminated or significantly reduced antimicrobial therapy by early 2022. (Italy, 2022; peer-reviewed: exa.ai)
• displacement — On Canadian dairy farms, 31% of surveyed farms reported adopting selective dry cow therapy, while 66% enacted blanket dry cow therapy. (Canada, 2019-2021; peer-reviewed: exa.ai)
• driver — The European Union banned the prophylactic use of antibiotics (blanket dry cow therapy) in livestock effective January 2022, which has been a primary driver for the transition to selective dry cow therapy. (European Union, 2022; peer-reviewed: pmc.ncbi.nlm.nih.gov)
• performance — Selective dry cow therapy (SDCT) can reduce the use of antimicrobials at dry-off by 66% compared to blanket dry cow therapy (BDCT). (global (meta-analysis of multiple trials), 2000-2021; peer-reviewed: frontiersin.org)

Suppliers — real products and services (from the vendor index)#

Honest finding: the vendor index has no mastitis, teat-sealant or nisin teat-dip supplier. This is recorded as a supplier gap.

Companies below are active vendors in the vendor index whose own card (profile / official website) shows this product or service — matched 2026-10-05 by keyword and checked by hand against the card text. Being listed is not an endorsement; open each card for evidence, contacts and status.

Update 2026-10-05: the new Europe dataset adds the closest capabilities — rows marked Europe below; the gap noted above still stands.

Government funding signals#

Public grants for a specific technology are a leading indicator: governments fund what regulators want to replace and what is close to practical adoption. Searched on 2026-09-27 in: EU CORDIS (FP7, Horizon 2020, Horizon Europe), US federal awards (USAspending: USDA NIFA/ARS/APHIS/Forest Service, EPA, DOE, NOAA, USAID; plus NSF and NIH), UK UKRI Gateway to Research, Australian Research Council. Each grant below was reviewed by hand for relevance. China, Brazil and India are covered in the subsection below (publication-acknowledged grants). Not covered: Russia (RSF, FASIE — not reachable from the research environment) and national agencies outside these databases. Amounts are the funder’s contribution as recorded (US NIH/UKRI: per award or fiscal year).

Signal: Strong. 3 relevant grant(s) · about €6.5M in total · jurisdictions: EU, USA.

China, Brazil, India — national research grants acknowledged in publications#

Chinese, Brazilian and Indian funders have no open grant databases reachable here, so this measures scientific papers published since 2015 that acknowledge national government grants, taken from the grant numbers publishers deposit with Crossref. Only papers whose title contains this article’s key terms are counted (a conservative lower bound; “100+” = search window full). It shows research-funding intensity, not budgets. Funders: China — NSFC, National Key R&D Program, China Agriculture Research System; Brazil — CNPq, CAPES, FAPESP, Embrapa, FAPEMIG; India — DBT, DST, ICAR, SERB, CSIR, BIRAC. Rating per country: Strong ≥50 papers · Moderate 10–49 · Weak 1–9.

Scientific evidence#

• Scherpenzeel CGM, den Uijl IEM, van Schaik G, Olde Riekerink RGM, Keurentjes JM, Lam TJGM (2014). Evaluation of the use of dry cow antibiotics in low somatic cell count cows. Journal of Dairy Science 97: 3606–3614.
• Rabiee AR, Lean IJ (2013). The effect of internal teat sealant products (Teatseal and Orbeseal) on intramammary infection, clinical mastitis, and somatic cell counts in lactating dairy cows: a meta-analysis. Journal of Dairy Science 96: 6915–6931.
• Kabera F, Roy JP, Afifi M, et al. (2021). Comparing blanket vs. selective dry-cow treatment approaches for elimination and prevention of intramammary infections during the dry period: a systematic review and meta-analysis. Frontiers in Veterinary Science 8: 688450.
• Sears PM, Smith BS, Stewart WK, et al. (1992). Evaluation of a nisin-based germicidal formulation on teat skin of live cows. Journal of Dairy Science 75: 3185–3190.
• Regulation (EU) 2019/6 on veterinary medicinal products, Art. 107 (ban on routine and prophylactic antimicrobial use, applicable from 28 January 2022).

Bioeconomy value#

Diagnostics (information) plus a fermentation-derived bacteriocin replace mass antibiotic use in the dairy chain, and milk and manure become cleaner.