Full explanation
SARA (Subacute Ruminal Acidosis) rarely causes acute death but quietly cuts productivity 5–15% and damages the rumen wall. Symptoms: (1) reduced forage intake, (2) foamy yellowish diarrhea, (3) milk fat drop −0.3–0.5%, (4) laminitis lameness from endotoxins, (5) incompletely chewed cud, (6) off-odour feces. Diagnosis: (1) rumenocentesis (needle puncture pH test); (2) automatic rumen boluses smaXtec/eCow; (3) integrated yield+fat+protein assessment. Prevention: (1) peNDF ≥21%; (2) starch <26% DM; (3) gradual concentrate ramp post-calving; (4) buffers — NaHCO3 150–200 g/day, Magox, live yeasts Saccharomyces cerevisiae Levucell (UAH 30–50/cow/day). 40–60% of Ukrainian 300+ head farms carry elevated SARA through poorly balanced TMR.