Source
doi:10.3168/jdsc.2022-0293 — original publication (opens in a new tab; the file is not redistributed)
Lopez-Villalobos et al. (2023) — Once-a-day milking in New Zealand (review)
The primary that makes the house cow modellable, and that shows the circulating lifestyle-blog figure is mislabelled
JDS Communications 4(4):329-333 · DOI 10.3168/jdsc.2022-0293 · Massey University + LIC. A review of full-lactation once-a-day (OAD) milking, which is what a community house cow actually is. Headline: OAD gives −27% milk, −23% fat, −24% protein against twice-a-day, at higher fat and protein concentrations and with better reproductive performance. 🎯 The fat penalty is smaller than the volume penalty — fat concentrates in OAD milk, which partly protects a butter-oriented community system. 🔴 This replaces the lifestyle-blog house-cow figure and exposes it as mislabelled: the blog’s “Jersey house cow 2,835 L” sits at the NZ twice-a-day commercial level, not the once-a-day level. NZ OAD Jersey measures 2,211–2,592 kg/cow.
Summary
A short review paper in JDS Communications by Massey University and LIC authors, synthesising the New Zealand evidence on once-a-day milking: how full-lactation OAD compares with conventional twice-a-day (TAD) milking on yield, composition, reproduction and breed response. OAD is not a fringe or degraded practice in New Zealand — the review reports it is practised whole-lactation in about 10% of NZ herds, making it a real, measured production system with a substantial national evidence base.
This matters to Neobiome because a house cow is a once-a-day pasture cow. Commercial statistics (OT_172) describe twice-a-day herds; applying them to a community animal overstates output. This review supplies the correction factor, and — critically for an edible-fat model — shows that the fat penalty is smaller than the volume penalty, because fat concentration rises under OAD. It also supplies NZ breed-resolved absolute yields, so the model can work from measured OAD numbers rather than discounting TAD numbers by a rule of thumb.
Key claims
- claim: "FULL-LACTATION ONCE-A-DAY vs TWICE-A-DAY: -27% milk, -23% fat, -24% protein, at HIGHER fat and protein concentrations, with better reproductive performance. The fat penalty is smaller than the volume penalty — fat concentrates in OAD milk, which partly protects a butter-oriented system. [verified verbatim against the source]"
source_location: "Lopez-Villalobos et al. (2023), JDS Communications 4(4):329-333, DOI 10.3168/jdsc.2022-0293 — OAD vs TAD production comparison."
- claim: "NZ BREED-RESOLVED ABSOLUTE YIELDS (kg/cow, Table 1): Jersey OAD 2,211-2,592; Holstein-Friesian OAD 2,879-2,914; against twice-a-day Jersey 2,839-2,929 and twice-a-day Holstein-Friesian 3,824-4,234. ⚠ Units are KILOGRAMS, not litres. [verified verbatim against the source]"
source_location: "Lopez-Villalobos et al. (2023), Table 1 — NZ once-a-day and twice-a-day yields by breed."
- claim: "JERSEY IS THE MOST OAD-TOLERANT BREED — a -17% yield response to once-a-day milking, against Holstein-Friesian's -19 to -25%. [verified verbatim against the source]"
source_location: "Lopez-Villalobos et al. (2023) — breed x milking-frequency interaction."
- claim: "ONCE-A-DAY IS PRACTISED WHOLE-LACTATION IN APPROXIMATELY 10% OF NZ HERDS — a real production system with a national evidence base, not a degraded one. [verified verbatim against the source]"
source_location: "Lopez-Villalobos et al. (2023) — NZ adoption of once-a-day milking."Neobiome Intelligence relevance
Feeds d02_smart_food_systems as the production-system correction that turns commercial dairy statistics into a community house-cow figure.
| Breed | TAD (commercial) | OAD (house-cow-like) | Source |
|---|---|---|---|
| Jersey | 2,839–2,929 kg/cow | 2,211–2,592 kg/cow | LIT_090 Table 1 |
| Holstein-Friesian | 3,824–4,234 kg/cow | 2,879–2,914 kg/cow | LIT_090 Table 1 |
Three consequences for the edible-fat model:
- Use the OAD row, not a discounted TAD row. These are measured NZ absolute yields; the model does not need to apply the −27% itself.
- The fat penalty is milder than the milk penalty (−23% vs −27%), and concentration rises. A community optimising for butter loses less than a community optimising for milk volume — a genuinely favourable asymmetry for the cooking-fat pathway that pairs with OT_172’s per-breed milkfat kilograms.
- Jersey’s OAD tolerance (−17%) reinforces it as the community breed of choice, on top of its highest fat percentage (5.71%, OT_172 Table 4.6). The two effects compound in the same direction.
⚠ Even the OAD figures are an UPPER BOUND on a true low-input house cow with a calf at foot. These are herd-scale OAD systems on managed pasture, not a single cow sharing her milk with a calf. No NZ source measures a genuine house cow — that is an unfilled gap, recorded below rather than raised as a target because it is a measurement that does not exist to retrieve.
No engine cell is auto-changed by this ingest.
Notes
- A circulating lifestyle-blog house-cow figure is mislabelled.
ourwayoflife.co.nz, a lifestyle blog with no primary behind it, gives a “Jersey house cow 2,835 L” figure that in fact sits at the NZ twice-a-day commercial level (LIT_090 TAD Jersey 2,839–2,929 kg), not the once-a-day level (2,211–2,592 kg). Using it would overstate a house cow’s output by roughly a quarter. LIT_090 + OT_172 supersede it. - Units are kilograms, not litres. Mixing the blog’s litres with this paper’s kilograms is a second, independent error path. Keep the units explicit.
- Source format: the raw is the EuropePMC full-text XML, which carries the complete article text rather than an abstract.
- Vintage: 2023, current.
Research targets
Documents to retrieve
- (none) — this IS the NZ once-a-day primary. Retrieving it closed the gap; no upstream reference needs chasing to use its figures.
Research gaps
- No NZ source measures a true low-input house cow (calf at foot). Recorded here rather than raised as a research target: this is a measurement that does not appear to exist, not a document waiting to be retrieved. The honest treatment is to carry the OAD figures as an explicit upper bound wherever the model states a house-cow output.
- Feed demand under OAD. OT_171’s requirement table is built for twice-a-day commercial production; a lower-producing OAD cow eats less, but by how much is not established here. Folded into the OT_171 caveat set rather than raised separately.
Connections
Links to
Referenced by
Cases (1): Riverside Community
EDT domains (1): D02: Smart Food Systems & Agriculture