In an industry obsessed with peak milk yields, Peter Smith slashed udder culls from 1-in-3 to 1-in-7 on his 1,700-cow dairy—saving ~$189K annually in replacements alone. A massive 162,057-record Dutch study backs it: cows on biofilm-disrupting protocols live 0.7 years longer, deliver $1,700 extra lifetime profit each, and cut culling risk by 23% (P=1e-46). This episode challenges the rapid-turnover gospel: with heifers at $3,500 amid a 47-year shortage, is longevity now dairying's biggest margin play?

Key Takeaways:

• Why biofilms cause 80% of chronic mastitis—and how quorum sensing inhibition breaks them without antibiotics or resistance.
• The $3,500 heifer math flipping replacement economics: when does keeping a 4th-lactation cow beat genomics turnover?
• Peter Smith's real results: 17% of herd past  ...