Professional & scientific writing on modern dairy.
Bouvera Dairy Digest is a working journal of dairy practice — reviewing evidence, sharing on-farm protocols and translating research into decisions herd managers can act on.
Feed quality: the foundation every ration is built on
No formulation can rescue poor forage. What feed quality really means — digestibility, fermentation, contamination and consistency — and why it sets the ceiling for milk from home-grown feed.
- Fibre digestibility (NDFd) as the key forage quality trait
- Harvest maturity and its effect on energy and intake
- Moulds, mycotoxins, soil and ash as hidden quality losses
- Consistency matters as much as the average value
More from this issue
Amino acids: feeding the cow's protein needs, not just crude protein
Cows need amino acids, not crude protein. How balancing methionine and lysine can lift milk protein while lowering ration protein and nitrogen losses.
Why feed sampling matters: a ration is only as good as its analysis
Rations are formulated from numbers. If the sample is wrong, the ration is wrong. A practical guide to representative sampling of silage, hay, concentrates and the mixed ration.
Fibre length: building the rumen mat without limiting intake
Particle length decides how much the cow chews, how well she buffers her rumen and how much she can eat. A practical review of physically effective fibre.
Dry matter intake: the master variable of milk production
Every kilogram of extra dry matter the cow eats can support roughly two more kilograms of milk. What drives intake, what limits it, and how to measure it.
Water intake and hygiene: the first nutrient
A lactating cow can drink 80–150 litres a day. How much water cows need, from calves on day one to high yielders, and why trough hygiene directly affects feed intake.
Different feeds and the importance of separation
Forages, concentrates, by-products and minerals each behave differently. Why storing them separately, mixing them in the right order and preventing sorting protects every ration.
NASEM 2021 explained: the new dairy nutrition rulebook in plain language
In 2021 the US National Academies replaced the 2001 dairy guidelines. What changed, why it matters, and what it means on your farm — explained simply.
New feeds on the global market: insects, algae and upcycled by-products
Volatile prices, climate targets and circular-economy policies are bringing new ingredients into dairy rations. A look at what is emerging and what the evidence says.
Alfalfa hay around the world: how regions use the queen of forages
From irrigated deserts in the Middle East to Californian dairies and Nordic lucerne trials, alfalfa is used very differently worldwide. Quality, trade and ration roles compared.
September 2026 · Issue 3 · Dairy Reproduction
Ten peer-informed articles on dairy reproductive management — follicular physiology, oestrus detection, the voluntary waiting period, body condition and energy balance, heat stress, pregnancy diagnosis and loss, genomics and sire selection, heifer rearing, reproductive KPIs and the economics of fertility.
The oestrous cycle, revisited: follicular waves and what actually decides conception
Forty years of ultrasonography have replaced the textbook 21-day cycle with a far more useful model of two- and three-wave follicular dynamics. A refresher for herd managers on the physiology that every fertility decision rests on.
Oestrus detection: what sensors changed, and what they did not
Automated activity monitoring now matches or beats trained visual observation in most commercial settings — but detection rate is only half the equation. A review of sensitivity, specificity and the timing question that still decides conception.
Setting the voluntary waiting period: one number that should not be one number
A single herd-wide voluntary waiting period is convenient and almost always suboptimal. The evidence for differentiating by parity, production and uterine recovery, and how to build the decision rule in your own records.
Body condition and energy balance: the fertility decision made before calving
Conception in the third month of lactation is largely determined by what happened in the three weeks either side of calving. A review of condition-score change, the nadir of energy balance and the management levers that move both.
Heat stress and fertility: the seasonal loss that is now a northern problem too
Summer conception depressions used to be a Mediterranean concern. With rising summer temperature-humidity indices in northern Europe, the seasonal fertility curve is flattening herds that have never cooled before.
Pregnancy diagnosis and pregnancy loss: reading the loss curve honestly
Fertilisation is rarely the problem. Most reproductive loss in lactating dairy cows happens between fertilisation and day 42, and the diagnostic method you choose determines how much of it you can even see.
Sire selection after genomics: fertility traits, inbreeding and sexed semen
Genomic selection reversed the decades-long decline in dairy female fertility. What that means for how a herd picks bulls, manages relatedness and deploys sexed and beef semen across the herd.
Heifer rearing for reproductive success: growth targets that hold up
Age at first calving is the most-quoted heifer KPI and the most frequently misused. What the evidence says about growth rate, breeding by weight rather than age, and the long shadow of the first eight weeks of life.
Reproductive KPIs: the six numbers worth managing
Most herd software will generate forty reproductive metrics. Six of them carry nearly all the decision value, and one of them — 21-day pregnancy rate — decomposes cleanly into the two things you can actually change.
The economics of fertility: what a day open is really worth
The cost of a day open is quoted everywhere and understood almost nowhere. A structural approach to valuing reproductive performance on your own farm, and where reproductive investment actually returns.
August 2026 · Issue 2 · Dairy Health
Ten peer-informed articles on preventative dairy herd health — udder health, the transition period, mineral status, hoof hygiene, calf foundations, antimicrobial stewardship, uterine health, biosecurity, sensor-based detection and the economics of prevention.
Udder health by design: building a herd that resists mastitis
Mastitis prevention has not changed direction since the Five Point Plan of 1969 — it has simply become measurable. A practical review of milking routine, environment and dry-period management as the three levers that decide a herd's somatic cell count.
The transition period: managing intake, space and stability around calving
Three weeks either side of calving decide most of a cow's lactation. A review of the intake curve, pen-move stress and stocking density — and the monitoring routine that catches a struggling fresh cow before she becomes a case.
Mineral status around calving: DCAD strategy as a prevention programme
Subclinical hypocalcaemia is the quiet gateway disorder of early lactation. What four decades of dietary cation–anion difference research says about feeding the dry cow, and how to verify that a prepartum strategy is actually working.
Infectious hoof health: hygiene, footbath design and the prevention loop
Digital dermatitis is an environmental hygiene problem expressed in the hoof. A review of alley cleanliness, footbath dimensions and the monitoring cadence that keeps prevalence low without escalating chemistry.
Calf health foundations: colostrum, air and bedding
Preweaning morbidity is decided in the first twelve hours and in the cubic metres of air above the calf. A practical review of passive transfer targets, ventilation design and nesting scores for the youngstock unit.
Antimicrobial stewardship: what the low-use countries did differently
The Netherlands, Denmark and Sweden cut veterinary antimicrobial use sharply without losing herd performance. A review of the structural changes — benchmarking, recording and prevention-first herd planning — that made it possible.
Postpartum uterine health: calving hygiene as reproductive management
Uterine health after calving is largely determined before calving — by intake, calving-pen hygiene and the discipline of when not to intervene. What the evidence says about protecting fertility through management.
Biosecurity as everyday good practice: what the research says works
Biosecurity fails not because farmers reject it but because it is designed as an ideal rather than a routine. A review of the practice-level evidence on entry control, animal introductions and internal hygiene — and how to score your own farm honestly.
Sensors and early detection: turning rumination and activity data into prevention
Sensor systems detect deviation days before people do — but only where the farm has decided in advance what an alert means. A review of the validation evidence and a framework for building an alert protocol that does not get ignored.
The economics of herd health: costing prevention properly
Disease costs are dominated by the losses nobody invoices — lost milk, extended calving intervals, premature culling. A review of the published cost estimates and how to build a prevention budget that stands up to scrutiny.
July 2026 · Issue 1 · Dairy Welfare
Ten peer-informed articles on the science and practice of dairy cattle welfare — lying time, lameness, heat stress, cow–calf contact, pain management, enrichment, bedding, economics, history and international legislation.
Lying time as the master welfare signal: what 12 hours really means
Lying time is the single most validated behavioural indicator of dairy cow welfare. A review of thresholds, measurement pitfalls and what recent accelerometer studies add to a 20-year evidence base.
Lameness prevention: from prevalence audits to a functional-trimming calendar
Herd-level lameness above 20% is a system failure, not a hoof problem. Combining Sprecher-style locomotion scoring with modern claw-lesion epidemiology to build a preventive trimming schedule that actually holds.
Heat stress is now a Northern European welfare problem
The THI-68 threshold sits well below the summer conditions Scandinavian and UK barns were designed for. Retrofit priorities that convert cooling spend into welfare and yield.
Cow-calf contact systems: what the evidence base actually says in 2026
Extended cow-calf contact has moved from a fringe question to an active research programme. What the current literature supports, what remains contested, and what the practical trade-offs look like in commercial herds.
Pain management for disbudding: the current standard of care
Cornual nerve block plus NSAID plus sedation is now the evidence-based baseline for calf disbudding. A summary of the drugs, timing and monitoring that make it work on-farm.
Environmental enrichment for dairy cows: beyond brushes and pasture
Mechanical brushes are now standard, but the enrichment literature has moved well beyond them. What the current evidence supports for cows, heifers and calves in intensive systems.
Calf bedding: the underrated determinant of pre-weaning welfare
Nesting score, dryness and thermal insulation drive calf morbidity more than most other pen-level factors. What the evidence supports for bedding type, depth and management.
The economics of dairy welfare: what pays back and what doesn't
Welfare investments are routinely framed as costs. The published economic literature tells a more nuanced story: several core interventions pay back within a lactation, while others require premium markets to justify.
A short history of dairy welfare science: from Brambell to sensor-based assessment
Dairy welfare science is younger than most practitioners assume. Tracing the arc from the 1965 Brambell Report through the Five Freedoms, Five Domains and modern positive-welfare frameworks.
Dairy welfare legislation: an international comparison in 2026
EU, UK, US, Canadian, New Zealand and Nordic frameworks diverge sharply on tethering, disbudding, cow-calf contact and pasture access. A practitioner's map of the current legal baseline.