Breeding Genes
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Breeding Genes

Fertility
This gene determines how easily a horse gets in foal, as well as how likely a mare is to carry a foal to term. Both parents' fertility factors in when breeding!

If a horse has low fertility, you may opt to feed one parent Vigor to guarantee the mare will get in foal. You can also give Bucket Of Love to guarantee that a mare's fertility never drops below Low.

Fertility is not genetic, in other words does not pass on to foals.
Heritage
This is a quad-gene that influences how a horse passes their genes to their offspring. This is expressed as a simplified rating for horses on their genetics page, much like the rest of their genes. A horse with high Heritage is more likely to pass on dominant genes (X), while a horse with bad heritage is more likely to pass on recessive genes (x). When determining the rate of passing genes, the parents' Heritage is evaluated, not the foal's.

Heritage will not allow a horse to pass anything that they are not genetically capable of - a horse with XX cannot throw an x and a horse with xx cannot throw an X.

Although Heritage uses the standard rating system, the ratings have slightly different meanings, as listed below.

Heritage Ratings
Outstanding No recessive alleles
Excellent 1-2 recessive alleles.
Good 3-4 recessive alleles.
Fair 5-6 recessive alleles.
Poor 7-8 recessive alleles.

Mistweaver's Cloak also will improve Heritage genes to at least 4 heterozygous, but will not raise Heritage beyond that.
Male Probability
This hidden gene determines the likelihood of having male offspring. The gender of a foal is determined by the MP gene of that foal, not its parents. A foal born with Homozygous MP is more likely to be a colt, and a foal born with recessive MP is more likely to be a filly. This is not 100% guaranteed, so it's possible to have males with recessive MP or females with Homozygous MP.
Female Influence
This hidden gene determines how influential a female's bloodline is on her offspring. If this is homozygous in the foal, the foal will usually follow their dam's bloodline. If it is recessive in the foal, they will usually follow their sire's bloodline.

This is never 100% guaranteed, so you cannot depend on FI to determine bloodline definitively.
Producer Quality
This hidden gene determines a horse's likelihood of producing high potential foals. You can test for Producer Quality at the Geneticist for any horse if they meet these requirements: pensioned, at least 20 years old, and owned by their breeder. Horses without a breeder are never eligible to be tested. Producer quality applies to both mares and studs, but carries a far greater weight for studs.

Although potential could indicate a better producer, this does not always correlate with producer quality. Any horse can be a legendary producer and any horse can be a terrible producer, whether 6 or 60 potential. Potential just gives you a glimpse into the producing ability of the parents. Researching the pedigree and parents' producing information is going to be more accurate than solely looking at potential.

Select Sale horses who are Legendary producers will have their Producer Quality automatically revealed.

Heir's Crown does give you the ability to see this hidden gene.

Family Jewels also gives you the ability to see and improve this hidden gene.

Mistweaver’s Cloak will cloak and randomize a bloodtype for a horse, but also improves Producer Quality.