Dr A McGregor writes:
Quote:
Finally, one interesting factor with red blood cells is the recent USA work which indicates that horses have two types of red blood cells. The first is a rigid cell similar in consistency to a basketball. The other is more like a water-filled balloon which is able to change shape in confined areas. Horses with more of the less rigid cells will find it easier to move blood into the muscles and the lungs and so may be able to maintain greater period of stamina work than their more rigid cell competitors. On average though, horses have 40% rigid and 60% fluid cells. A horse with 5% rigid cells would have a tremendous advantage, all else being equal, and this may be an area that explains why some horses are superior to their fellows. It is very interesting and its only problem is that you need an electron microscope to tell the difference. However, possibilities in assessment of future performance ability will mean this area will continue to be researched.