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.
Each note is graded in its own topic, not against the reader. A hoof primer can be Basic even if you already know rumen.
- Knowledge level in this topic: Basic. First-pass in this topic — useful even if you already know another area well.First-pass in this topic — useful even if you already know another area well.
- Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Barn-side working knowledge in this topic: checks, pairing, and what to do next.
- Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Mechanism and stacked risk in this topic — assumes the first-pass frame.
71 notes · newest first in each area · View the network
Rumen
Fermentation, fiber, and starch load
- Dry Matter and As Fed Are Different JobsScales weigh feed with its water, rations are balanced on dry matter, and a wetter or drier silage means the same scale weight no longer delivers the same dry matter.Knowledge level in this topic: Basic. First-pass in this topic — useful even if you already know another area well.Rumen · Physically effective fiber · 3 min
- Count the Unsaturated Fat, Not Just the FatFat on the feed tag is not the count that matters. The unsaturated fat the rumen sees, from every ingredient, can stack with starch and weak fiber.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Rumen · Starch load & SARA · 3 min
- Nitrogen Efficiency Is Milk N Over Feed NOnly about a quarter to a third of the nitrogen a lactating cow eats leaves in milk. The rest goes out in urine and manure. Protein fed beyond what the cow can use mostly adds urinary nitrogen, which costs money and adds to ammonia loss.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Rumen · Inside the rumen · 3 min
- Rumen-Inert Fat Is Energy with a CatchRumen-inert fat can increase dietary energy density, but its value depends on the fatty acids supplied, their digestibility, and how the cow responds.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Rumen · Starch load & SARA · 3 min
- Starch 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.Rumen · Starch load & SARA · 3 min
- Kernel Processing Unlocks the StarchCorn silage starch is only worth what the rumen can reach. A whole or merely cracked kernel keeps it locked away, and harvest is the only time the processor can still fix that.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Rumen · Starch load & SARA · 3 min
- NFC Is a RemainderMost carbohydrate lines on a feed report come from a lab assay. NFC does not. It is what is left after NDF, protein, fat and ash are subtracted from 100, so it carries their errors, and it holds a lot more than starch.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Rumen · Physically effective fiber · 5 min
- uNDF240 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.Rumen · Physically effective fiber · 5 min
- Microbes 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.Rumen · Inside the rumen · 3 min
- VFAs 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.Rumen · Inside the rumen · 3 min
- What Leaves the RumenLiquid and solid digesta leave the rumen on different clocks. Fast fluid outflow harvests microbial protein, while fiber particles leave only after they shrink and sink.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Rumen · Inside the rumen · 3 min
- The Four CompartmentsRuminants run specialized pre-gastric fermentation: four compartments, but field management lives or dies on rumen health (fiber → usable energy).Knowledge level in this topic: Basic. First-pass in this topic — useful even if you already know another area well.Rumen · Inside the rumen · 3 min
- The Rumen ChamberThe rumen is a fluid-filled fermentation vat: carbs often make up 60–70% of dietary DM, and how much concentrate it handles depends on forage, fiber, starch, processing, and the bunk.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Rumen · Inside the rumen · 3 min
- 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.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Rumen · Physically effective fiber · 3 min
- 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.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Rumen · Physically effective fiber · 3 min
- 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.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Rumen · Physically effective fiber · 3 min
- 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.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Rumen · Physically effective fiber · 3 min
- 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.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Rumen · Inside the rumen · 3 min
- 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.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Rumen · Starch load & SARA · 3 min
- MP is not crude proteinCrude protein counts nitrogen. Metabolizable protein asks what amino acids actually reach the cow after the rumen.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Rumen · Inside the rumen · 3 min
- 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.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Rumen · Inside the rumen · 3 min
- 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.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Rumen · Inside the rumen · 3 min
- 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.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Rumen · Physically effective fiber · 3 min
- 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.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Rumen · Inside the rumen · 3 min
- 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.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Rumen · Physically effective fiber · 3 min
- Cud chewing is the cheapest rumen sensorRumination is how the cow rebuilds particle size and pumps saliva bicarbonate into the vat. If she stops, less buffer reaches the rumen.Knowledge level in this topic: Basic. First-pass in this topic — useful even if you already know another area well.Rumen · Inside the rumen · 3 min
- Empty bunks are starch eventsCows that wait, then eat fast, can drop rumen pH even when the printed diet never changed.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Rumen · Starch load & SARA · 3 min
- 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.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Rumen · Inside the rumen · 3 min
- Milk fat first, then manureSARA rarely announces itself with a down cow. The tank and the alley move while the parlor still looks busy.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Rumen · Starch load & SARA · 3 min
- Particle size holds the fiber matIf the TMR is too fine, the forage raft thins — less trapping, less re-chewing, less bicarbonate-rich saliva.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Rumen · Inside the rumen · 3 min
- SARA 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.Rumen · Starch load & SARA · 3 min
- Shake the bunk, not the memoryThe particle box is only honest if the sample is the diet the cow can reach.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Rumen · Physically effective fiber · 3 min
- The top sieve is not the goalLong stems look like fiber and often become refusals.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Rumen · Physically effective fiber · 3 min
Udder
Mammary anatomy and mastitis pathways
- 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.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Udder · Mastitis pathways · 3 min
- 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.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Udder · Mastitis pathways · 3 min
- 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.Knowledge level in this topic: Basic. First-pass in this topic — useful even if you already know another area well.Udder · Mastitis pathways · 3 min
- 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.Knowledge level in this topic: Basic. First-pass in this topic — useful even if you already know another area well.Udder · Mastitis pathways · 3 min
- The teat end is the gateA compromised teat sphincter undermines even effective post-milking disinfection; managing hyperkeratosis begins with machine function and milking routine.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Udder · Inside the udder · 3 min
Hoof
Claw map, lesions, recognition, and risk
- Sole Ulcers, Laminitis, and Diet: Separating Evidence from AssumptionSole ulcers get blamed on “too much grain” more often than the evidence supports — separate diet risk from flooring, standing time, and claw mechanics before rewriting the ration.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Hoof · Claw-horn lesions · 3 min
- Digital Cushion Thickness, Transition, and Sole-Ulcer RiskThe digital cushion helps dissipate load beneath the pedal bone. Thin sole soft tissues have been associated with later claw-horn lesions, but cushion thickness is not simply a reflection of body condition. Stage of lactation, parity, farm conditions, previous lesions, and tissue structure all appear to matter.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Hoof · Why hoof lesions develop · 4 min
- Digital Dermatitis in Heifers: Prevention Before First LactationHeifers that meet endemic digital dermatitis before first calving pay for it in early lactation — prevention in the rearing pen beats chasing first-lactation ulcers after they hit the parlor.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Hoof · From lameness to lesion · 3 min
- Flooring, Traction, Wear, and Their Effect on Claw HealthFlooring is a daily mechanical dose: traction and abrasive wear shape claw horn faster than most herds measure, and the wrong surface quietly builds the next ulcer cohort.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Hoof · Why hoof lesions develop · 3 min
- Footbath Design: Length, Depth, Cow Passes, and CleanlinessA footbath only works if every cow gets enough clean contact — length, depth, and how often the bath is refreshed decide whether heels are treated or just splashed with dirty solution.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Hoof · From lameness to lesion · 3 min
- Digital Dermatitis Staging: M0 to M4.1M-stages (M0–M4.1) turn “hairy heel wart” into a herd language for active vs chronic lesions — staging drives treatment urgency, footbath strategy, and whether chronic cows are seeding the pen.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Hoof · From lameness to lesion · 3 min
- Footbaths: Prevention, Not TreatmentA footbath is a herd prevention tool for digital dermatitis pressure — not a cure for an active painful lesion waiting in the chute. Concentration, cow passes, and cleanliness decide whether the bath reduces new cases or just paints dirty heels.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Hoof · From lameness to lesion · 3 min
- Early Lameness Detection: Why Treating the First Lame Step MattersCatching the first mild limp beats waiting for an obvious non-weight-bearing cow. Early follow-up shortens lesion progression and protects lying time and milk.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Hoof · From lameness to lesion · 3 min
- Hoof Blocks and Off-Loading: Taking Pressure Off the Painful ClawA hoof block is mechanical off-load for a painful claw-horn lesion — not a spray substitute. Sound-claw selection, placement, and a timed recheck decide whether it helps or harms.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Hoof · From lameness to lesion · 3 min
- 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.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Hoof · From lameness to lesion · 3 min
- 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.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Hoof · From lameness to lesion · 3 min
- Standing time is the doseProlonged standing load can bruise the corium and surface weeks later as a claw-horn lesion.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Hoof · Why hoof lesions develop · 3 min
- The new parlor added two hours of standingThroughput rose. Thin soles followed the extra hold time.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Hoof · Why hoof lesions develop · 4 min
- Name horn or skin before you sprayDigital dermatitis and a sole ulcer fail entirely different tissues. One protocol cannot fix both.Knowledge level in this topic: Basic. First-pass in this topic — useful even if you already know another area well.Hoof · From lameness to lesion · 3 min
Transition
The ±3-week window around calving
- A Pen Move Is a Social EventMoving a cow puts her into a group with its own social order; for hours to days she may be displaced more and eat less, so plan how often, when, with whom and into how much space cows move.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Transition · The transition cow · 3 min
- Amino Acids in the Transition WindowAround calving, a cow eats less just as her udder, liver and immune system pull hard on amino acids. In trials, extra methionine from about three weeks before calving has mostly raised milk protein afterward, while the health benefits are less certain.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Transition · The transition cow · 3 min
- Dry period is recovery timeA controlled dry period plus close-up bunk access is mammary recovery time — not an empty parking lot before calving.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Transition · The transition cow · 3 min
- The DCAD sweet spotPrepartum DCAD is a calcium-readiness tool — moderate negative targets help; extremes buy little calcium and more acid load.Knowledge level in this topic: Advanced. Mechanism and stacked risk in this topic — assumes the first-pass frame.Transition · The transition cow · 3 min
- When the fresh cow’s energy gap widensAfter calving, milk demand rises faster than intake — the gap is where ketone risk lives.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Transition · The transition cow · 3 min
- 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.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Transition · The transition cow · 4 min
- Intake before the next additiveTransition-cow intake is the first ration to protect: a heating TMR lowers the nutrients she can actually consume.Knowledge level in this topic: Basic. First-pass in this topic — useful even if you already know another area well.Transition · The transition cow · 3 min
Barn
Heat, stocking, water, and cow flow
- Lying Longer Is Not Always BetterAbout 12 hours of lying a day is a common design goal, but a long lying day can mean comfort or illness, and lying hours are not sleep.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Barn · Stocking & cow flow · 3 min
- The Pen Average Hides the Cows That LoseA pen average weights every cow equally, so a small group that is doing badly can disappear inside a number that looks acceptable.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Barn · Stocking & cow flow · 3 min
- A rising fetch list is a time-budget failureRobots succeed when cows choose the box and still get their lying time. A climbing fetch list is a prompt to check where the barn is stealing it.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Barn · Stocking & cow flow · 3 min
- Build the stall around the riseLying time is the budget a stall protects. A stall that blocks the rise charges that time back as standing, collisions, and lesions.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Barn · Stocking & cow flow · 3 min
- Stocking density is a time budgetOverstocking steals lying and eating time. Manage stalls, bunk, and flow, not headcount alone.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Barn · Stocking & cow flow · 3 min
- 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.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Barn · Heat stress · 3 min
- 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.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Barn · Heat stress · 3 min
- 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.Knowledge level in this topic: Basic. First-pass in this topic — useful even if you already know another area well.Barn · Heat stress · 3 min
- They closed a crossover to add stallsHeadcount math ignores behavioral biology: walling off a crossover crippled cow flow and penalized subordinate cows.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Barn · Stocking & cow flow · 3 min
- Walk the dry yard at two o’clockThe milk barn can look cooled while the next lactation pants in a still pocket.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Barn · Heat stress · 3 min
- Hidden stocking is lockup plus holdThe stall sheet said 100%. The cows stood from breakfast through the second parlor turn.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Barn · Stocking & cow flow · 3 min
- The holding pen was the hottest roomParlor fans were fine. The packed pen before the gate was still.Knowledge level in this topic: Intermediate. Barn-side working knowledge in this topic: checks, pairing, and what to do next.Barn · Heat stress · 4 min
