8d ā¢ Vet Casesāļø
š· Case Study: Why Are the Biggest Piglets Dying First?
Meet a litter of fourteen piglets on a confinement hog farm in Iowa. They are three weeks old and the farm manager is baffled. The biggest, fastest-growing piglets in the litter are the ones dying, found dead after routine handling or after scrambling for teat access. The runts are fine.
You arrive and examine the survivors. Their skin is pale, almost grayish. Their gums are white. Several are breathing hard at rest, sides heaving. They are weak and slow to move when you approach.
You ask one question: when did these piglets last receive iron dextran?
The answer is never. The previous farm manager stopped the iron injection protocol eight weeks ago to cut labor costs.
You pull blood from five piglets. Hemoglobin comes back at 4.6 g/dL against a normal of 10 to 12. MCV is 43, severely microcytic. MCHC is 26, hypochromic. The reticulocyte count is 0.7 percent, well below normal despite the severe anemia. The bone marrow is trying to respond but has nothing to work with. Serum iron is 38. TIBC is 510, markedly elevated as the body desperately upregulates transferrin trying to find iron that is not there.
This is iron-deficiency anemia, and the reason the biggest piglets are dying first is not intuitive. The fastest-growing piglets have the highest iron demand per day for new hemoglobin synthesis to support their expanding blood volume. Every piglet in the litter gets roughly the same amount of iron from sow milk, approximately 1 milligram per day against a daily requirement of 7 to 10 milligrams. The pig gaining the most weight every day burns through that deficit the fastest and crashes first.
You instruct the farm to stop handling the affected piglets unnecessarily. A severely anemic heart can decompensate and stop during the exertion of being chased or caught. You give every piglet 200 milligrams of iron dextran by deep intramuscular injection into the neck muscle. The most critical animals receive a whole blood transfusion from an older iron-replete pig first.
The farm restarts its prevention protocol immediately. Every future litter will receive 200 milligrams of iron dextran on day one to three of life.
š” The takeaway: In swine production, iron-deficiency anemia is completely preventable with a single injection. When the protocol stops, the biggest piglets pay the price first.
For a full course on this condition, see the classroom or follow the link below:
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š· Case Study: Why Are the Biggest Piglets Dying First?
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