Starch load & SARA

Numbers

• Normal post-meal dip

  Brief

  Then recovery toward 6+

  A dip after eating is expected. Failure to recover — hours spent low — is the SARA pattern. Without a bolus, infer recovery from chewing and manure later in the day.

  Penn State Extension

Field notes on this focus

1. Note 01SARA is not grain overloadAcute acidosis is an emergency. SARA is a chronic, almost-normal herd pattern that can quietly cost milk fat and fiber digestion, and it is associated with poorer claw health.Knowledge level in this topic: Basic. First-pass in this topic — useful even if you already know another area well.Basic3 min · 2026-09-07

Also touches this focus

1. Note 01Starch Rate, Not Starch PercentTwo rations can print the same starch percentage and still ferment at very different speeds. Grain type, processing and time in the silo set that speed, and the fall switch to new-crop corn silage changes it twice: once at the switch and again over the winter.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Intermediate3 min · 2026-09-26
2. Note 02uNDF240 Sets the Fill LimitNDF tells you how much cell wall a forage carries. uNDF240 estimates how much of it the rumen cannot digest, and that fraction takes up space until it is chewed small enough to leave. In high-producing cows, it can cap how much they eat.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Intermediate5 min · 2026-09-25
3. Note 03Microbes and FermentationFeed the microbes first: fiber + NFC → VFAs for energy; dietary N upgrades to microbial crude protein; biohydrogenation of PUFA is microbial survival, not an MFD deep dive.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Intermediate3 min · 2026-09-22
4. Note 04VFAs and AbsorptionVFAs absorbed across the rumen wall supply most of the cow's metabolizable energy: acetate for milk fat and maintenance, propionate for glucose and lactose, butyrate for the wall itself.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Intermediate3 min · 2026-09-22

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