A Fresh Buffalo with Low Milk Fat: Acidosis or a Mineral Problem?
A farmer keeps eight Murrah buffaloes. One buffalo in her third lactation calved 18 days ago and yields 11 L/day. She is fed 7 kg wheat straw, 5 kg green sorghum and 4 kg concentrate daily in two meals. The concentrate contains 50% maize, 30% cottonseed cake, 15% wheat bran and 5% mineral mixture. Water is offered twice. Over one week, milk fat has fallen from 6.4% to 4.9%, dung is loose with undigested grain, and rumen pH measured with a strip is 5.9. She is off feed and rumination is reduced. Body temperature is normal. The farmer proposes adding 1 kg cottonseed cake and 500 g calcium daily to restore fat and milk. Another neighbour advises 2 kg more maize. The buffalo's body condition is good, and she has no fever or mastitis.
1. Diagnose the problem and explain why the two proposed changes would or would not help.
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This is sub-acute rumen acidosis (SARA), not a calcium deficiency and not a simple energy shortage. Rumen pH 5.9, loose dung with undigested grain, reduced rumination and a sharp fat drop point to a rumen that is too acidic. The concentrate is not enormous for 11 L, but it is being fed in two large meals with a high-starch maize base and limited effective fibre. Fine or low-fibre forage makes the problem worse.
Adding 1 kg cottonseed cake would add protein and some fat, but it would not correct the acid load; it may help later, not now. Adding 2 kg maize would make the acidosis worse. Calcium is not the issue: there is no fever and no typical milk-fever history, and calcium will not raise fat in this situation. The correct first move is to restore rumen function: more effective fibre, smaller concentrate meals, a buffer, and more water.
2. Give a corrected feeding schedule for the next 10 days, with quantities and a monitoring plan.
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For 7–10 days: reduce concentrate from 4 kg to about 2.5–3 kg/day and split it into three or four small feeds. Increase green fodder to 8–10 kg/day and wheat straw to about 8 kg/day, and offer a little long straw after concentrate. Add sodium bicarbonate at about 150–200 g/day, mixed in the feed, and continue the mineral mixture. Offer water three or four times a day; twice is not enough for a milking buffalo.
Do not change everything on one day. Make the change over 3–5 days, keeping the rumen stable. Monitor rumen pH (aim for 6.2–6.8), cud chewing, dung consistency and milk fat. If pH remains below 6.0 or she goes off feed, call a veterinarian. Once stable, raise concentrate gradually, keeping roughly 1 kg concentrate per 2.5–3 L milk rather than feeding a large single meal. A bypass fat can be considered later if energy is still short, but not before the rumen pH is corrected.
3. The farmer wants to cull the buffalo because of the fat drop. How would you assess the economics and the risk of culling now?
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Culling 18 days after calving would be a costly decision. She is at early lactation with 11 L/day; over a 250-day lactation that is about 2,750 L, worth roughly ₹1.1 lakh at ₹40/L, before accounting for her calf and manure. The treatment cost is small: a few kilograms of buffer and a ration adjustment. A cull sale now gives a one-time price but loses the rest of the lactation and requires a replacement, which may cost more than the treatment.
Set a clear review point: if rumen pH and fat recover, she stays. Cull or rebreed only if she has repeated acidosis, persistent low yield, or fails to conceive. Record the ration and response; this is also a management lesson for the other seven buffaloes.