Fainting or near Fainting. Rapid Heartbeat â Tachycardia. When the heart beats too quickly (usually above 100 beats per minute), the lower chambers, or ventricles, do not have enough time to fill with blood, so they cannot effectively pump blood to the rest of the body.
If a horse has two copies of Gray, all offspring of this horse will be gray. Research indicates that horses with one copy of Gray often retain some of the original pigment while homozygotes tend to progress to almost completely white. Gray is found in many breeds and is the predominant color of the Lippizaner breed. Gray horses have a high incidence of dermal melanomas that are commonly seen around the tail and head. Over 70% of Gray horses older than 15 years will develop melanoma.
The combination of the dominant Cream gene and the recessive Pearl dilution gene will produce a pale coat color similar to that of horses that are homozygous for the Cream gene, such as cremello. The skin is pale and the eyes a blue/green color. Other Pages In the Color Section of this Website:The Base Colors: Red.ed and Flaxen will only manifest if the horse is homozygous for the allelle of that gene; i.e. Red results only when there are two e forms of the Extension gene. A single dominant E allelle will overpower it, resulting in a black horse. (Red means both Sorrel and Chestnut.