Publisher disclosure. This guide is published by ingenious targeting laboratory, a commercial provider of contract mouse breeding and colony management. We sell one of the two models compared on this page. We do not name or rank other providers here; the comparison is between the two operating models.
The two models
In house breeding
Your line lives in your institutional vivarium. Your staff set pairs, wean, sample, and genotype. You pay per diem on every cage, including cages holding animals that are not part of any experiment. You control the animals directly and can change plans the same day.
Outsourced colony management
A contract facility holds the line, runs the crosses, genotypes the animals, and ships cohorts when you need them. You pay for the service and for the animals produced. You free the cage space and the technician hours, and you take on a coordination and shipping step.
Comparison
| Factor | In house breeding | Outsourced colony management |
|---|---|---|
| Cage space | Occupies your vivarium allocation, including non experimental animals | Frees your allocation for active experiments |
| Direct cost | Per diem on every cage plus technician hours plus genotyping reagents | Service fee plus animals produced |
| Cost visibility | Spread across per diem, salary, and supply budgets | Quoted per project, easier to attribute to a grant |
| Cohort timing | Often a trickle across several weeks, limited by available racks | Synchronized block when parallel pairs can be set at once |
| Cohort uniformity | Wide age range unless spare capacity allows parallel pairs | Age matched inside a defined window |
| Genotyping | Run between other tasks, turnaround varies | Validated assays with controls, defined turnaround |
| Complex schemes | Tracking multi allele pedigrees adds error risk across generations | Dedicated pedigree tracking and scheme design |
| Genetic integrity | Depends on local pair rotation and background verification practice | Structured rotation and background verification |
| Health status | Tied to your facility status | Barrier facility, sentinel testing, health certification on shipment |
| Responsiveness | Same day access to animals | Requires scheduling and shipping lead time |
| Continuity | Vulnerable to staff turnover, holidays, funding gaps | Continuous, contracted |
| Control | Full and immediate | Contracted, with monthly reporting |
| Institutional friction | None | Transfer approvals, health certification, shipping logistics |
The cost question
Cost comparisons can be misleading when they evaluate a service quote only against the marginal cost of an additional cage. The true cost of in-house cohort production also includes cage space at your institutional per diem, technician time, genotyping reagents and instrument time, and the animals bred but ultimately not used in the study.
Run the worksheet
Fill in your own numbers. We do not publish per diem rates because they vary by institution and change annually. Ask your vivarium for current figures.
| Cost line | How to calculate | Your figure |
|---|---|---|
| Cage per diem, breeding cages | Institutional per diem x breeding cages x days | Your figure, to be completed |
| Cage per diem, holding cages | Institutional per diem x cages holding non experimental animals x days | Your figure, to be completed |
| Technician hours | Hours per week on pairing, weaning, sampling x loaded hourly rate x weeks | Your figure, to be completed |
| Genotyping | Reagents plus instrument time plus hands on hours per animal x animals genotyped | Your figure, to be completed |
| Animals bred and not used | Total weaned minus experimental animals minus littermate controls, costed at per diem to weaning | Your figure, to be completed |
| Cost of a missed study date | Grant period, staff time, or delayed publication | Your figure, to be completed |
| Cost of losing the line | Regeneration or repurchase plus elapsed time | Your figure, to be completed |
The right hand column is intentionally blank. Print the worksheet or copy it into a spreadsheet and enter your own current institutional figures.
The line that surprises most programs is the last one. In a cross yielding the target genotype at 12.5 percent, seven of every eight weaned pups are not experimental animals. You paid per diem, genotyping, and technician time on all of them.
What the literature shows
One published three group comparison found that laboratories outsourcing genotyping produced more cages and more mice over time than laboratories using standard in house practice, and that groups also receiving breeding assistance from a dedicated animal care team saw a further increase in colony productivity. Cost per new animal ended comparable across all three groups by study end, which means the gain showed up as throughput rather than as a lower unit price.
Reference
VanDenBerg KR, Oravecz-Wilson K, Krolikowski L, Hill V, Reddy P, Freeman ZT. Impact of Automated Genotyping and Increased Breeding Oversight on Overall Mouse Breeding Colony Productivity. Frontiers in Physiology, 2022. DOI 10.3389/fphys.2022.925784 · PMID 35923239 · PMCID PMC9340497.
Read the full study on PubMed Central (PMC9340497, opens in a new tab)Cohort timing
Trickle cohorts
In house colonies usually breed with the pairs they have. Pups arrive across several weeks, so the animals entering a study span a wide age range. That age spread becomes an uncontrolled variable in behavioral, metabolic, and oncology work.
Synchronized cohorts
A contract facility with spare rack capacity can set many pairs at once with staggered starts, so litters land inside a narrow window and the cohort ships as one block. The difference is capacity and scheduling, not technique. A well resourced in house vivarium can do the same thing if it has the racks free.
Genetic integrity
Drift
Colonies maintained without structured pair rotation and background verification can accumulate genetic drift over generations. A drifted line may no longer fully match the phenotype reported in the original publication, and cohorts bred from it may not be directly comparable to earlier work.
Background purity
Lines arriving on a mixed background need backcrossing to reach a defined background. Recipient background reaches 97 percent approximately at N5 and 99.9 percent, congenic, at N10. Each generation runs roughly 10 to 12 weeks, so a full backcross to congenic can be a two year commitment of cage space if run in house.
Linkage
When a floxed allele and a Cre driver sit on the same chromosome, independent assortment does not apply and the target genotype frequency depends on the recombination rate between the loci rather than the expected frequency for unlinked loci. Programs that discover this after setting pairs may lose a generation. Check locus positions during scheme design.
Risk
A research colony has single points of failure. A pathogen event in the room, a freezer failure with no backup, a breeding collapse in an aging line, a technician departure, or a funding gap can all end the same way: the line is gone and regenerating it costs a year.
Outsourcing can reduce the operational challenges and resource demands of maintaining a colony in house. A commercial facility provides dedicated breeding capacity, animal care, and staffing, while a cryopreserved backup maintained separately from the live colony provides an additional safeguard against loss.
When to keep breeding in house
- The colony is small and the genotype is simple
- Your vivarium has spare cage capacity
- You need same day access to animals for opportunistic experiments
- Your institution restricts external animal transfers
- Trainees need colony management experience as part of their program
When to outsource
- Cage space is your binding constraint
- The scheme runs three or more generations to the target genotype
- A fixed study start date or grant deadline is at risk
- You need a large synchronized cohort rather than a steady trickle
- Genotyping is being run between other tasks and results are slow
- The line is irreplaceable and has no cryopreserved backup
- Technician turnover has already interrupted breeding once
A middle path
The two models are not exclusive. A common arrangement keeps a small working colony in house for ongoing studies and sends the scaled cohort production out. Another keeps breeding in house and outsources genotyping alone, which is the change the published comparison above measured directly.
How ingenious targeting laboratory fits
We run contract breeding from a U.S. barrier facility in Holbrook, New York. Since 1998 we have generated 2,800+ custom genetically engineered models, serving 900+ laboratories. A PhD scientist designs every scheme before pairs are set, and every animal released is genotype confirmed by PCR.
The initial consultation and scheme review cost nothing. If the answer is that you should keep the colony in house, we will tell you.
Frequently asked questions
Talk it through
Send us the line, the target genotype, the number of animals, and your study date. A PhD scientist will review the scheme and tell you what it takes in either model.
