(Bloomberg) -- Dairy farmers in California are grappling with a steadily advancing outbreak of avian flu in their herds – a problem few of them want to talk about publicly, but that none of them can afford to ignore.Most Read from BloombergInside NYC’s Playbook for Getting Federal Grant FundsThe Tartarian CandidateThere Will Soon Be No Meatpackers Left in NYC’s Historic Meatpacking DistrictA Courtyard Apartment Building Designed for Southwest SprawlBooming Cambridge Exposes England’s Widening We