How the Goat Color Calculator Works

How the odds work

Each parent passes one of its two copies at a locus to each kid. We enumerate the possible offspring for every parental copy pair that fits the entered information. Different loci are combined under the model's inheritance assumptions; competing Agouti patterns are copies at one locus, not independent switches.

A look can fit more than one copy pair. For each kid color, the lower number is the smallest chance across those possibilities and the upper number is the largest. We do not average them or weight them by breed frequencies. The separate upper limits need not add to 100%, because they can come from different parental possibilities.

When all compatible possibilities give the same chance, that chance can be exact under the stated model. A DNA result, an informative pedigree or a recorded kid can narrow the possibilities. A range describes uncertainty about these parents; it does not promise a particular mix in one litter.

An unknown second copy stays unknown; we never fill it in as black. In members' records, some goats recorded as gold have kids recorded as buckskin or Swiss, which fits a gold goat hiding another pattern.

The Nigerian Dwarf example is a chamoisee buck and a Swiss doe, each with a black parent. Under the stated dominant-chocolate assumption, chamoisee, Swiss, chamoisee Swiss and black each have a 25% chance per kid. These family facts are labeled examples, not claims about your goats.

Breed words and evidence

The breed choice sets the modeled allele pool and the names used for the pictures. A known cross uses both parents' supported breed pools. A goat without a supported breed or with unknown ancestry gets a partial answer in species words. Explicit recorded color genotypes can add the particular named alleles they establish without adding every allele from another breed.

Agouti patterns have DNA evidence in studied breeds, including Swiss breeds. Matching a Nigerian Dwarf look to the same allele is a visual interpretation, not an ND DNA finding. Buckskin is a breeders' name; which allele it is has not been tested. Registry descriptions help name a look and explain registration rules, but do not establish its inheritance.

AGS color descriptions and the ADGA registration instructions listed below were checked on October 22, 2026. Registry guidance is rechecked at least yearly; a registry can change its rules between checks.

The evidence labels mean: Proven by DNA in the named studied breed; Shown in breeding records; Breeders report; or Not worked out yet. An observation in one breed does not establish the same mechanism in every breed. Tier labels belong to individual alleles and claims, not the whole calculator.

White spotting, moonspots, blue eyes, frosted, belt and roan have separate limits. A marking's amount and shape are not predicted by the picture. Where a single-gene trait uses an assumed reading, the result labels it and states the assumption about the other parent.

Brown and the buckskin alternative

The starting assumption is that this line's chocolate is dominant. A gold can carry chocolate without showing it, and where a line's chocolate is recessive it can hide in black goats. Use “This line's chocolate is recessive” to see that reading. A chocolate look alone does not establish which Brown allele a goat has or how many copies it carries.

Dominant and recessive brown were reported in one Pygmy herd. A TYRP1 variant and a small breeding experiment support dominant brown in studied Swiss goats. Those findings do not measure how frequent either reading is in Nigerian Dwarfs. Every exact result remains conditional on the selected brown reading.

The main buckskin reading treats it as an Agouti pattern alongside chamoisee. When it changes a map, a second result shows what follows if a chamoisee can hide buckskin, as some member records suggest. The two readings stay separate. Member records test compatibility with a model; they do not prove the allele or its inheritance.

Silver

Some Nigerian Dwarf breeders call a silvery-gray coat "silver". We haven't found a study showing what causes it, and the word may cover more than one thing. Heavy roan and the gray Agouti pattern are two known causes of gray coats in goats, and some breeders think silver is a gene of its own. These would give different kids. If silver works like roan or a separate gene, the pattern odds shown still apply. If it is the gray Agouti pattern, a silver parent passes on either silver or its other pattern, not both, and a gold goat could hide it. Until a study or clear breeding records tell these apart, we don't calculate silver, and a result with a silver parent isn't marked exact.

What is not calculated

Not calculated for goats of unknown ancestry: dominant black, Angora-type or breed-specific white, white body, other breed patterns; kids can show colors not listed here.

A partial answer can still calculate supported Agouti patterns, brown pigment, polled/PIS and entered single-gene traits. It does not turn an unmodeled mechanism into a “none” tile. If a parent's look is Not sure, supported health and trait information can remain useful while the color map waits for a look.

The Nigerian Dwarf lens does not include dominant black or Angora-type white. Sponenberg notes dominant black may occur in some African breeds; if so, a black relative may not mean “hides black.” Gray Agouti and mahogany have no reviewed region model here. Exact shade, age changes, the amount of white and the placement or size of markings are not calculated.

Polled goats and intersex risk

If the buck has one copy of polled, about 1 in 8 kids is expected to be an intersex goat: genetically female and infertile, and it can look like a doeling, a buckling or something in between. If he has two copies, about 1 in 4. If you don't know which he has, plan for 1 in 4. This assumes the polled doe is fertile (she has kidded, or a test shows one copy). Breeders usually pair a polled goat with a horned one: half the kids are polled (all of them if the polled buck has two copies), and none have polled intersex syndrome. A polled DNA test is offered in Europe (Giessen, Bern).

Intersex (PIS): about 1 in 8 to 1 in 4 of all kids, any color

The health row is over all kids and sits beside the color map. It is never a color tile and does not change the map's 100% color total. The range assumes a fertile one-copy polled doe, a roughly equal chance of genetic sex, and a buck whose polled copies are unknown. A one-copy buck gives about 1 in 8 of all kids; a two-copy buck gives about 1 in 4 of all kids.

If she has never kidded, she could be an intersex herself; a vet check or the polled test settles it.

That last caution applies to a polled doe that has never kidded and has two polled parents. “Disbudded” and “dehorned” do not mean genetically polled. Natural horns in a color illustration say nothing about the horn status entered for the calculation.

Tested traits and health limits

An untested parent is not a clear parent. When one or both parents lack the relevant test, the result says not tested and does not invent offspring odds for that test. Use the laboratory report and your veterinarian for decisions about an individual goat.

Congenital myotonia: UC Davis VGL and ADGA treat it as recessive: a goat with one copy (N/CM) is not expected to show signs. OMIA lists it as dominant, so one copy could show signs; no published goat breeding study settles it. The calculator labels the two readings separately. VGL lists Nigerian Dwarfs among breeds appropriate for testing.

If either goat has Nubian ancestry, ask about G6S testing. One or both parents are not tested; offspring odds are not calculated.

G6S deficiency is a recessive condition of Nubians and related crosses. Two tested carriers have a 25% chance of a kid with two copies under that model. This is a tested-pair statement, never a claim that an untested goat is a carrier or clear.

Alpha-S1 casein uses one CSN1S1 locus and the two laboratory letters. VGL groups A and B as high and E, F and N as low; research classifies E as intermediate. We keep that distinction visible. A casein class is not a promise about one goat's milk or cheese yield.

Scrapie results and the PRNP phase assumption

PRNP is one haplotype locus. The modeled copies are N146/Q222, S146, D146 and K222, not two independently inherited codon loci. The lab's codon wording remains alongside the reading. S146, D146 and K222 are protective against classical scrapie; protective does not mean scrapie-proof. US rules still treat exposed goats as susceptible.

A double heterozygote such as N/S, Q/K does not show whether S146 and K222 are on the same copy (cis) or different copies (trans). The result is labeled “assuming the two protective variants are on different copies.” White et al. did not find an S146-K222 haplotype, and cloning resolved two double-heterozygous Alpines as trans in Torricelli et al.; this supports an assumption, not a phase result for your goat.

The modeled “no tested variant” copy is N146/Q222. It can still carry M142, Q211 or H154, which this model does not represent; it does not mean every PRNP variant is absent.

With a parent lacking both variants, that trans reading gives every kid a protective variant; a cis arrangement would give half. We never turn it into the 75% answer from two independent loci. Other codon combinations stay in the lab's wording with no odds when they do not match modeled haplotypes.

Records, pictures and corrections

When you use your goats, the recorded wording stays visible beside the reading. A vague phrase is not a genotype. Family records can pre-answer Yes when they support it, but missing records never establish No. Only relatives you can view contribute a fact or a named explanation.

A recorded kid outside the predicted colors is a reason to check the color name, the age it was named at, parentage and the stated assumptions. It is not proof of wrong parentage. Shared pairings carry entered colors, answers and deidentified modeled constraints, not animal names, identifiers or private family explanations.

Color illustration shown with natural horns. Horn status is entered separately. Real goats can differ in shade, white markings and age. The drawings help compare looks; neither a drawing nor a match to it establishes an allele.

Inputs that can narrow an answer

References

1. Adalsteinsson et al. (1994). Inheritance of Goat Coat Colors. doi:10.1093/oxfordjournals.jhered.a111454
2. Henkel et al. (2019). Selection signatures in goats reveal copy number variants underlying breed-defining coat color phenotypes. doi:10.1371/journal.pgen.1008536
3. Sponenberg et al. (1996). Dominant and recessive brown in goats. doi:10.1186/1297-9686-28-1-117
4. Becker et al. (2014). The brown coat colour of Coppernecked goats is associated with a non-synonymous variant at the TYRP1 locus on chromosome 8. doi:10.1111/age.12240
5. Dietrich et al. (2015). A breeding experiment confirms the dominant mode of inheritance of the brown coat colour associated with the 496Asp TYRP1 allele in goats. doi:10.1111/age.12320
6. Pailhoux et al. (2001). A 11.7-kb deletion triggers intersexuality and polledness in goats. doi:10.1038/ng769
7. Simon et al. (2022). The Complex and Diverse Genetic Architecture of the Absence of Horns (Polledness) in Domestic Ruminants, including Goats and Sheep. doi:10.3390/genes13050832
8. White et al. (2008). Prion gene (PRNP) haplotype variation in United States goat breeds (Open Access publication). doi:10.1186/1297-9686-40-5-553
9. Rahmatalla et al. (2022). Review: Genetic and protein variants of milk caseins in goats. doi:10.3389/fgene.2022.995349
10. Beck et al. (1996). Molecular basis for decreased muscle chloride conductance in the myotonic goat. doi:10.1073/pnas.93.20.11248
11. Talenti et al. (2017). Genomic Analysis Suggests KITLG is Responsible for a Roan Pattern in two Pakistani Goat Breeds. doi:10.1093/jhered/esx093
12. Sponenberg et al. (1988). The Inheritance of Frosted Points in Nigerian Dwarf Goats. doi:10.1093/oxfordjournals.jhered.a110452
13. Torricelli et al. (2021). PRNP Polymorphisms in Eight Local Goat Populations/Breeds from Central and Southern Italy. doi:10.3390/ani11020333
14. Sponenberg (2004). Genetics of Goat Color. Expert descriptions and limits of visual interpretation. https://cpb-us-w2.wpmucdn.com/u.osu.edu/dist/c/15138/files/2015/08/genetics_goat_clr_20041-1t6x030.pdf
15. UC Davis Veterinary Genetics Laboratory. Congenital Myotonia (CM) in Goats. Laboratory recessive reading and test scope. https://vgl.ucdavis.edu/test/cm-goats
16. American Dairy Goat Association. Congenital Myotonia. Registry reading. https://adga.org/congenital-myotonia/
17. OMIA 000698-9925. Myotonia in Capra hircus. Attributed dominant reading. https://omia.org/OMIA000698/9925/
18. UC Davis Veterinary Genetics Laboratory. G6-Sulfatase Deficiency (G6-S MPSIIID). https://vgl.ucdavis.edu/test/g6-s-goat
19. USDA APHIS. Scrapie. Genetic susceptibility and the treatment of exposed goats for US regulatory purposes. https://www.aphis.usda.gov/livestock-poultry-disease/sheep-goat/scrapie
20. UC Davis Veterinary Genetics Laboratory. Goat Scrapie Susceptibility. Reported codon genotypes. https://vgl.ucdavis.edu/test/goat-scrapie-susceptibility
21. UC Davis Veterinary Genetics Laboratory. Alpha-S1 Casein. Laboratory grouping of reported variants. https://vgl.ucdavis.edu/test/alpha-s1-casein
22. Justus Liebig University Giessen. Genetic test for PIS (goat). https://www.uni-giessen.de/en/faculties/f09/institutes/breeding/pet/services/genetic-testing-for-polled-intersex-syndrome-pis-in-goats/pis-genetic-test
23. American Goat Society. Suggested Colors for Nigerian Dwarf Goats. Descriptive registry words, not inheritance evidence. https://americangoatsociety.com/ND-suggested-colors-patterns.php
24. American Dairy Goat Association. Registration instructions. Descriptive color and marking words. https://adga.org/wp-content/uploads/2023/08/RegistrationApplication230804.pdf

How to cite

Creatures. How the Goat Color Calculator Works. Educational methods and sources. https://creatures.com/goat-coat-color-calculator/how-it-works. Updated October 22, 2026.

Changes

• October 22, 2026: Initial methods: breed-aware color ranges, explicit model assumptions, silver limits, tested traits and source references.