Sheep Serum (Normal Sheep Serum, NSS) — Sterile Filtered | EU Origin | SeamlessBio
EU Stock 0.2 µm sterile filtered No MOQ CoA included
Normal Sheep Serum (NSS) is a versatile blocking reagent and research material for immunohistochemistry, veterinary diagnostics, and vaccine research. It is the species-matched blocking agent required whenever anti-sheep secondary antibodies are used in IHC, IF, or ELISA protocols — and the only correct choice for this application.
Its protein profile — dominated by ovine IgG, albumin, and transferrin — closely mirrors goat serum, making NSS an effective alternative in multiplex IHC panels that combine both sheep and goat secondary antibodies. As a native (non-heat-inactivated) lot, NSS provides active ovine complement — essential for complement fixation tests (CFT) in veterinary diagnostics.
Applications of Normal Sheep Serum (NSS)
| Application | Standard Protocol | Why NSS? |
|---|---|---|
| IHC / IFA Blocking | 5% NSS in PBS-T, 30–60 min at RT before anti-sheep secondary antibody | Saturates Fc receptors and non-specific binding sites — prevents background staining |
| Complement Fixation Test (CFT) | Native NSS as ovine complement source — must NOT be heat inactivated | Ovine complement for CFT: Brucella, Chlamydia, Mycoplasma diagnostics in veterinary labs |
| Vaccine Research / Serological Testing | NSS as assay matrix for vaccine efficacy (Bluetongue, FMD, Brucella, PPR) | Species-authentic matrix for ELISA, HI test, seroneutralisation assays in ovine vaccine studies |
| Veterinary Diagnostic ELISA | NSS as negative control serum in commercial sheep ELISA kits | Standard negative control for Scrapie, Maedi-Visna, Brucella serology |
| Parasitology Research | NSS as culture supplement and assay control in ovine parasite models | Haemonchus contortus, Fasciola hepatica, Toxoplasma gondii — sheep infection models |
Technical Specifications
| Parameter | Specification |
|---|---|
| Species | Sheep (Ovis aries) |
| Abbreviation | NSS — Normal Sheep Serum |
| Collection | Pooled healthy donors, sterile bleed |
| Filtration | 0.2 µm sterile filtered |
| Origin | EU |
| Storage | −20 °C; aliquoting recommended to minimise freeze-thaw cycles |
| Volumes | 100 mL, 500 mL | Bulk on request |
| Documentation | CoA (Certificate of Analysis), CoO (Certificate of Origin) on request |
| Options | Heat inactivated (56 °C, 30 min) on request | Gamma-irradiated on request |
| Quality control | Sterility, pH, total protein, haemolysis-free |
Key Decision Rule: Which Serum for Which Application?
| Situation | Correct Serum | Reason |
|---|---|---|
| Secondary antibody is anti-sheep | NSS (Normal Sheep Serum) | Species-matched blocking prevents cross-reactivity |
| Secondary antibody is anti-goat | NGS (Normal Goat Serum) | Never use serum from the same species as primary antibody host |
| CFT in veterinary diagnostics | Native NSS (NOT heat inactivated) | Complement C1–C9 must be active |
| Sheep ELISA negative control | NSS from seronegative flock | No pre-existing antibodies against target pathogen |
| Multiplex IHC with sheep + goat | NSS or NGS — depends on secondary | Use species-matched serum for each detection channel |
Complete Animal Serum Portfolio at SeamlessBio
All 9 animal sera from one EU source — consistent documentation, no minimum order, batch reservation available.
| Species | Abbr. | Primary Application |
|---|---|---|
| Rabbit | NRS | IHC/WB/ELISA blocking — anti-rabbit secondary antibodies |
| Goat | NGS | IHC/IF blocking — most common secondary antibody host |
| Sheep | NSS | Blocking, complement CFT, vaccine & vet diagnostics |
| Mouse | NMS | ELISA controls, anti-mouse IHC, primary cell culture |
| Rat | — | Anti-rat IHC blocking, rat primary cell culture |
| Horse | DHS | PC12 differentiation, hybridoma, muscle differentiation |
| Chicken | NCS | CEF cell culture, poultry ELISA controls |
| Pig | NPS | Swine vaccine development, porcine vet diagnostics |
| Guinea Pig | NGPS | CFT complement source — unique diagnostic niche |
Frequently Asked Questions
What is the difference between sheep serum and goat serum for blocking?
Both are effective blocking agents with similar protein profiles. The critical rule is species matching: always use the serum from the same species as your secondary antibody. If your secondary is anti-sheep, use NSS. If anti-goat, use NGS. Using the wrong serum produces strong non-specific background that cannot be removed in downstream washing steps.
Is sheep serum suitable for complement fixation tests (CFT)?
Yes — NSS is a standard complement source for CFT in veterinary diagnostics (Brucella, Chlamydia, Mycoplasma). The lot must be native (NOT heat inactivated) to retain complement activity. Heat inactivation at 56 °C for 30 minutes destroys C1–C9 completely. Native NSS is available on request from SeamlessBio.
What concentration of NSS should I use for IHC blocking?
Standard: 5% NSS in PBS-T (0.1% Tween-20) for 30–60 minutes at room temperature for tissue section blocking. For cell culture immunofluorescence (IF), 2–5% is sufficient. If background persists, increase to 10% or extend blocking to 90 minutes.
Can I use sheep serum as matrix control in veterinary ELISA kits?
Yes — NSS from serologically negative flocks (no antibodies against the target pathogen) is the standard for negative control matrices in sheep ELISA kits. Lot-specific serology documentation confirming pathogen-negative status is available on request.
Is batch reservation available for sheep serum?
Yes — SeamlessBio offers batch reservation for all animal sera. You can reserve a specific lot for your entire study duration (typically 6–12 months) with free warehousing and scheduled deliveries. Contact us before purchase for a free test volume: info@seamlessbio.de
Order Information
| Parameter | Details |
|---|---|
| Shop URL | shop.seamlessbio.de/en/products/sheep-serum |
| Volumes | 100 mL, 500 mL | Bulk on request |
| Documentation | CoA, CoO on request — free with every order |
| Free test volume | Available before purchase — contact us |
| Batch reservation | Yes — reserve one lot for your entire project |
| info@seamlessbio.de | |
| Phone | +49 851 37932226 |