Effect of Excess Carbohydrate in Ruminants vs Non-Ruminants

Excess carbohydrate diet in ruminants & non-ruminants leads to-

Correct Answer: Metabolic acidosis & hyperglycemia respectively

Excess carbohydrate leads to completely different outcomes in ruminants vs. non-ruminants due to fundamental differences in digestion.

In Ruminants → Metabolic Acidosis (Ruminal Acidosis / Grain Engorgement)

• Excess starch/grain in rumen → rapid fermentation → lactic acid overproduction (by Streptococcus bovis and Lactobacillus spp., which are facultative anaerobes)
• Rumen pH falls from normal 6.5–6.8 to as low as 4.0 in severe grain engorgement
• Lactic acid absorbs systemically → metabolic acidosis
• Clinical signs: bloat, laminitis, rumen atony, diarrhea, recumbency, death if untreated

In Non-Ruminants → Hyperglycemia

• Excess carbohydrate → rapid glucose absorption in small intestine → hyperglycemia (elevated blood glucose)
• Normal blood glucose: Pig: 80–120 mg/dl; Dog: 70–120 mg/dl; Horse: 60–110 mg/dl
• Pancreas responds with insulin to bring glucose down; chronic excess → Type 2 diabetes risk