Free Martins are very much disposed to grow fat with good food. The flesh, like that of the Ox or spayed heifer, is generally much finer in the fibre than either the bull or cow; is even supposed to exceed that of the Ox and heifer in delicacy of flavour, and bears a higher price at market. However this superiority of the flavour does not appear to be universal, for Mr. Hunter was informed of a case which occurred in Berkshire, in which the flesh of a Free Martin turned out nearly as bad as bull beef. This circumstance probably arose from the animal having more the properties of a bull than a cow.
Mr. Hunter, having had many opportunities of dissecting Free Martins, has satisfactorily shown that their incapacity to breed, and all their other peculiarities, result from their having the generative organs of both sexes combined, in a more or less imperfect state of development, in some cases the organs of the male preponderating, in others those of the female.
The above, which is copied from an engraving in Hunter's work on the 'Animal Economy,' is a representation of a Free Martin, five years old; it shows the external form of that animal, which is neither like the bull nor cow, but resembling the Ox or spayed heifer.
Although, as Hunter observes, "it is almost universally understood, that when a cow brings forth two calves, one of them a bull-calf, and the other to appearance a cow, that the cow-calf is unfit for propagation," it is by no means universally the fact, as instances of such twins breeding were known even in Hunter's time, and have been witnessed more recently. The following is recorded in Loudon's 'Mag. of Nat. History,' and occurred a few years previous to 1826: Jos. Holroyd, of Withers, near Leeds, had a cow which calved twins, a bull-calf and a cow-calf. As popular opinion was against the cow-calf breeding, it being considered a Free Martin, Mr. Holroyd was determined to make an experiment of them, and reared them together. They copulated, and in due time the heifer brought forth a bull-calf, and she regularly had calves for six or seven years afterwards.
"If," says Hunter, "there are such deviations as of twins being perfect male and female, why should there not be, on the other hand, an hermaphrodite, produced singly, as in other animals? I had the examination of one which seemed, upon the strictest inquiry, to have been a single calf; and I am the more inclined to think this true, from having found a number of hermaphrodites among black cattle, without the circumstance of their birth being ascertained."
If Hunter had carried this reasoning a little further, he might have asked,—Why should there not be a Free Martin, or hermaphrodite, produced in the case of twins, when they are both apparently males, or both apparently females? Had he done this, he would not, probably, have made the following observation: "I need hardly observe, that if a cow has twins, and they are both bull-calves, they are in every respect perfect bulls; or if they are both cow-calves, they are perfect cows." What is this but saying that a bull-calf is a bull-calf, and a cow-calf is a cow-calf? For a Free Martin, or hermaphrodite, is not, in any case, either a bull or a cow.
There does not appear to be anything known of the peculiar circumstances under which, what is termed a Free Martin is produced.
Skull of Domestic Ox.