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Field notes

Dairy cow field notes from the Cowdemy atlas — rumen, udder, hoof, transition, and barn. Newest first, with the sheet each note belongs to.

45 notes · newest first in each area

Rumen

Fermentation, fiber, and starch load

  1. Chop length is not peNDFChop length is a harvester setting; peNDF is the fiber structure that actually reaches the rumen after moisture, processing, mixing, and sorting.Rumen · Physically effective fiber · 3 minChop length is not peNDF
  2. Refusals read the peNDF storyShake fresh TMR and the refusal pile with the same particle separator — divergence shows whether formulated peNDF actually reached the cow.Rumen · Physically effective fiber · 3 minRefusals read the peNDF story
  3. Sorting steals the peNDFA correctly mixed TMR can still fail when cows pick fines and leave long forage — the consumed ration loses peNDF even though the ticket looked right.Rumen · Physically effective fiber · 3 minSorting steals the peNDF
  4. Water is a fiber plasticizerForage dry matter changes how the TMR mixes and how the particle box reads — even when chop length matches a drier day.Rumen · Physically effective fiber · 3 minWater is a fiber plasticizer
  5. Air at the face spoils the packDense packing and oxygen-barrier cover lock fermentation in. A ragged, slow face lets air back in and burns dry matter at the bunk.Rumen · Inside the rumen · 3 minAir at the face spoils the pack
  6. Milk fat depression starts in the rumenHigh starch and unsaturated fat with weak effective fiber can shift biohydrogenation toward trans-10 intermediates that suppress mammary fat synthesis.Rumen · Starch load & SARA · 3 minMilk fat depression starts in the rumen
  7. MP is not crude proteinCrude protein counts nitrogen. Metabolizable protein asks what amino acids actually reach the cow after the rumen.Rumen · Inside the rumen · 3 minMP is not crude protein
  8. Read manure before you rewrite the ticketThe alley is a daily report card on the ration the cow actually ate and fermented — consistency, fiber, and grain tell you before the mixer does.Rumen · Inside the rumen · 3 minRead manure before you rewrite the ticket
  9. Saliva is the free bufferBagged bicarbonate has a line item. Saliva is the free, manageable buffer you earn with chewing — not the larger proton sink than SCFA absorption.Rumen · Inside the rumen · 3 minSaliva is the free buffer
  10. The mixer and push-up are part of the rationScales, mix time, and bunk push-ups decide whether the printed recipe is what the cow actually eats — empty bunks and drifted loads rewrite the ration.Rumen · Physically effective fiber · 3 minThe mixer and push-up are part of the ration
  11. The sensor is a barn alarm, not a diagnosisRumination and activity collars flag deviations from a cow’s own baseline — useful alarms that still need the cow, bunk, and stall before you act.Rumen · Inside the rumen · 3 minThe sensor is a barn alarm, not a diagnosis
  12. Overmixing Steals the MatYour ration might look perfect on paper, but if the mixer grinds your forage too fine, you lose the physically effective fiber required to build a healthy rumen mat.Rumen · Physically effective fiber · 3 minOvermixing Steals the Mat
  13. Cud chewing is the cheapest rumen sensorRumination is how the cow rebuilds particle size and pumps saliva bicarbonate into the vat. If she stops, the buffer stops.Rumen · Inside the rumen · 3 minCud chewing is the cheapest rumen sensor
  14. Empty bunks are starch eventsCows that wait, then eat fast, drop pH even when the printed diet never changed.Rumen · Starch load & SARA · 3 minEmpty bunks are starch events
  15. Reading milk fat as a rumen alarmA falling fat test is often the first cheap signal that fermentation has shifted, not that the cow forgot how to make fat.Rumen · Inside the rumen · 3 minReading milk fat as a rumen alarm
  16. Milk fat first, then manureSARA rarely announces itself with a down cow. The tank and the alley move while the parlor still looks busy.Rumen · Starch load & SARA · 3 minMilk fat first, then manure
  17. Particle size holds the fiber matIf the TMR is too fine, the forage raft thins — less trapping, less re-chewing, less bicarbonate-rich saliva.Rumen · Inside the rumen · 3 minParticle size holds the fiber mat
  18. SARA is not grain overloadAcute acidosis is an emergency. SARA is a chronic, almost-normal herd that is quietly losing fat, fiber digestion, and later hoof integrity.Rumen · Starch load & SARA · 3 minSARA is not grain overload
  19. Shake the bunk, not the memoryThe particle box is only honest if the sample is the diet the cow can reach.Rumen · Physically effective fiber · 3 minShake the bunk, not the memory
  20. The top sieve is not the goalLong stems look like fiber and often become refusals.Rumen · Physically effective fiber · 3 minThe top sieve is not the goal

Udder

Mammary anatomy and mastitis pathways

  1. Milk meters are early alarms — not diagnosesInline fat, protein, and SCC signals can flag rumen or udder trouble early — useful alarms that still need the bunk and the teat before you act.Udder · Mastitis pathways · 3 minMilk meters are early alarms — not diagnoses
  2. The stall bed is half the teat environmentBetween milkings the teat lives on the stall bed. Wet, dirty bedding is a continuous environmental bacterial dose.Udder · Mastitis pathways · 3 minThe stall bed is half the teat environment
  3. Milking is a transmission machineContagious mastitis hops cow-to-cow on liners, hands, and towels — the parlor is the transit system to the teat canal.Udder · Mastitis pathways · 3 minMilking is a transmission machine
  4. Name the reservoir firstMastitis control starts with the reservoir: milking-time spread and bedding exposure need different checks, and culture plus records should guide the next move.Udder · Mastitis pathways · 3 minName the reservoir first
  5. The teat end is the gateA compromised teat sphincter undermines even effective post-milking disinfection; managing hyperkeratosis begins with machine function and milking routine.Udder · Inside the udder · 3 minThe teat end is the gate

Hoof

Claw map, lesions, recognition, and risk

  1. Camera scores are screening — not diagnosesComputer-vision gait scores can prioritize cows and track herd trends — useful screening when camera setup is honest, never a veterinary diagnosis on their own.Hoof · From lameness to lesion · 3 minCamera scores are screening — not diagnoses
  2. Hoof records are herd trends — not diagnosesStandardized digital trim records and lesion codes can show infectious vs claw-horn patterns over time — useful herd trends when read with BCS, energy balance, and standing time, not a cow-side diagnosis.Hoof · From lameness to lesion · 3 minHoof records are herd trends — not diagnoses
  3. Standing time is the doseProlonged standing load can bruise the corium and surface weeks later as a claw-horn lesion.Hoof · Why hoof lesions develop · 3 minStanding time is the dose
  4. The new parlor added two hours of standingThroughput rose. Thin soles followed the extra hold time.Hoof · Why hoof lesions develop · 4 minThe new parlor added two hours of standing
  5. Name horn or skin before you sprayDigital dermatitis and a sole ulcer fail entirely different tissues. One protocol cannot fix both.Hoof · From lameness to lesion · 3 minName horn or skin before you spray

Transition

The ±3-week window around calving

  1. Dry period is recovery timeA controlled dry period plus close-up bunk access is mammary recovery time — not an empty parking lot before calving.Transition · The transition cow · 3 minDry period is recovery time
  2. The DCAD sweet spotPrepartum DCAD is a calcium-readiness tool — moderate negative targets help; extremes buy little calcium and more acid load.Transition · The transition cow · 3 minThe DCAD sweet spot
  3. When the fresh cow’s energy gap widensAfter calving, milk demand rises faster than intake — the gap is where ketone risk lives.Transition · The transition cow · 3 minWhen the fresh cow’s energy gap widens
  4. The fresh pen was stocked at 120%Calving went well; in the fresh pen, 96 cows competed for 80 headlocks, and first-lactation cows paid in lost bunk access and intake.Transition · The transition cow · 4 minThe fresh pen was stocked at 120%
  5. Intake before the next additiveTransition-cow intake is the first ration to protect: a heating TMR lowers the nutrients she can actually consume.Transition · The transition cow · 3 minIntake before the next additive

Barn

Heat, stocking, water, and cow flow

  1. A rising fetch list is a time-budget failureRobots succeed when cows choose the box and still get 12–14 hours lying. A climbing fetch list means the barn is stealing that time.Barn · Stocking & cow flow · 3 minA rising fetch list is a time-budget failure
  2. Build the stall around the riseHigh-producing cows need 12–14 hours lying. A stall that blocks the rise charges that time back as standing, collisions, and lesions.Barn · Stocking & cow flow · 3 minBuild the stall around the rise
  3. Stocking density is a time budgetOverstocking steals lying and eating time — manage stalls, bunk, and flow, not headcount alone.Barn · Stocking & cow flow · 3 minStocking density is a time budget
  4. THI and air speed stage the coolingBarn THI alone can miss the cow's microclimate — pair temperature-humidity with cow-level air speed so fans, misters, and soakers stage against what she actually feels.Barn · Heat stress · 3 minTHI and air speed stage the cooling
  5. Water space is a ration ingredientLinear water space and refill rate behave like ration ingredients — if subordinate cows wait, intake and milk are already slipping.Barn · Heat stress · 3 minWater space is a ration ingredient
  6. Water is the third letter in S-A-WShade and air get the budget meetings. On a muggy afternoon, the queue at the trough is often the first place heat load becomes visible.Barn · Heat stress · 3 minWater is the third letter in S-A-W
  7. They closed a crossover to add stallsHeadcount math ignores behavioral biology: walling off a crossover crippled cow flow and penalized subordinate cows.Barn · Stocking & cow flow · 3 minThey closed a crossover to add stalls
  8. Walk the dry yard at two o’clockThe milk barn can look cooled while the next lactation pants in a still pocket.Barn · Heat stress · 3 minWalk the dry yard at two o’clock
  9. Hidden stocking is lockup plus holdThe stall sheet said 100%. The cows stood from breakfast through the second parlor turn.Barn · Stocking & cow flow · 3 minHidden stocking is lockup plus hold
  10. The holding pen was the hottest roomParlor fans were fine. The packed pen before the gate was still.Barn · Heat stress · 4 minThe holding pen was the hottest room