भाषा:

Fibre is the part of a dairy cow’s ration that keeps the rumen working. Too little effective fibre means less chewing, less saliva and a higher risk of acidosis; too much poor fibre means low intake and low milk. The aim is adequate, digestible fibre in the right particle size, mostly from good forage. This guide explains NDF in simple words and gives practical steps for Indian dairy farms: chaff length, TMR, the concentrate to roughage balance and rumen buffering.

Key facts at a glance

ItemPractical reference
Best fibre measuresNDF, ADF and lignin on a lab report; crude fibre is less precise
NDF of the total rationOften quoted around 27 to 30% for many programmes
ADF of the total rationOften quoted around 16 to 19%; higher ADF means lower digestibility
Forage share of NDFAbout 75% of dietary NDF from forage is a common guideline
Cud chewing checkAt least half of the healthy resting cows should be ruminating
Concentrate rule of thumbAbout 500 g per litre of milk in some systems; not a universal formula

These are guidelines, not fixed limits. Your nutritionist should set targets for your own herd.

Infographic: fibre in dairy cow feeding, NDF 27 to 30%, ADF 16 to 19%, 75% of NDF from forage, and five steps for chaff length, TMR, concentrate balance and buffer

Why fibre matters for the rumen

Plant cell walls are made of cellulose, hemicellulose and lignin. Rumen microbes digest most of the first two, but lignin cannot be digested and it locks up the rest. That is why late-cut, stemmy fodder gives less energy and protein even though it gives more bulk per acre.

Fibre also works as a physical tool. Long enough particles make the cow chew and ruminate, and chewing makes saliva. Saliva carries bicarbonate, the cow’s own natural buffer against the acids produced when grain ferments. When the ration is too fine or too rich in grain, chewing falls, rumen pH drops and the cow slides toward ruminal acidosis: off feed, loose dung, falling milk fat and sometimes lameness later.

The opposite problem is real too. If NDF is too high because the forage is poor, the rumen stays full and intake drops, which hurts high yielders most. So both extremes cost money.

What this means for Indian dairy farms

  • Straw-heavy diets are high in fibre but low in energy and protein. The cow is full yet underfed.
  • Grain-heavy diets to chase milk can starve the rumen of effective fibre and cut fat percentage.
  • Very fine chaff looks tidy but gives little chewing. Very long pieces let cows sort and leave stems behind.
  • Early lactation is the danger window: demand rises sharply while intake lags, so farmers add concentrate fast.

What farmers should do now

  • Grow and cut forage on time. Harvest green fodder young and soft. Delay raises tonnes per acre but lowers digestibility. Dry fodder and silage need proper drying, compaction and sealing to avoid mould.
  • Get forage tested for dry matter, NDF, ADF and crude protein at least once a season, then balance for body weight, milk yield, fat, stage of lactation and body condition.
  • Chop to a sensible length. Not powder, not long stems. Check the trough: holes and a pile of refused stems mean cows are sorting.
  • Move to TMR where you can. Mixing chopped forage with concentrate gives every bite the same nutrition and lowers the risk of acidosis, indigestion and bloat.
  • Raise concentrate gradually after calving and split it into several meals instead of one heavy feed.
  • Watch the cows. Count how many resting cows are chewing cud, check dung consistency and milk fat, and note feed refusal every day.
  • Always keep clean, fresh water in front of the cows. It is the most overlooked nutrient.
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Frequently asked questions

What is NDF in cattle feed?

NDF (neutral detergent fibre) is the total cell-wall part of the feed. It controls how much a cow can eat, how long she chews and how well the rumen works.

Can I feed only straw to save money?

Straw gives fibre but very little protein and energy. Cheap feed that cuts milk, fertility and immunity can cost more in the end. Pair it with good green fodder and a balanced concentrate.

How do I know my cows are getting enough effective fibre?

Look for steady cud chewing in at least half of the resting cows, normal dung, stable milk fat and no sorting in the trough. A low cud count can have other causes too, so involve your vet if it persists.

Written by the IMN Pyrophos team in our own words.

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