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Conformation of twin and quadruplet freemartins

Published online by Cambridge University Press:  01 March 1959

H. P. Donald
H. P. Donald
Affiliation:
A.R.C. Animal Breeding Research Organisation, Edinburgh, 9
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Extract

1. Observations were made at 2 years of age on 25 freemartins and their castrated brothers. Three of the freemartins belonged to a set of 4-egg quadruplets. For comparison there were 93 normal pregnant twin and single-born heifers and 14 males twin to males.

2. Twelve body measurements on each animal were taken. Averages for each character for 25 single-born Ayrshire heifers and for 10 single-born Friesian heifers were used as standards for comparison with the various groups of twins of like and unlike sex, triplets, and quadruplets.

3. Normal twin heifers were slightly smaller in all respects than the standard. Freemartins were also smaller but more so. The quadruplet freemartins were smaller still, but at 2 years they had the live-weight of normal heifers only 1½ years old. Twin males, whether from like or unlike-sexed pairs, were on average slightly smaller than the standard.

4. Percentage deviations of each group mean from standard varied systematically when characters were listed in a pre-determined order based on earliness of maturing. This relation has been summarised for each group by the regression of the percentage deviation on order of maturity, the order beginning with head width, and ending with the widths of hooks, pins, and chest. Each available group differed significantly from the chosen standard in conformation in such a way that the later a character appeared in the order, the less it exceeded, or the more it fell short of the standard.

5. As judged by the size of these regression coefficients, males twin to males showed the greatest difference in conformation from normal single-born females. Males twin to freemartins showed a slightly smaller difference. Freemartins were intermediate but closer to males. Fertile twin females and single-born females differed very little. These relations held at both 2 years of age and a live-weight of 650 lb. (1½ to 1½ years).

6. The quadruplet freemartins were anomalous in having the linear dimensions of immature normal instead of freemartin females of the same weight as if their early maturing body characters had been permanently retarded during slow growth before and after birth.

Type
Research Article
Information
Animal Production , Volume 1 , Issue 1 , March 1959 , pp. 71 - 80
Copyright
Copyright © British Society of Animal Science 1959

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References

REFERENCES

Billingham, R.,& Lampkin, G., 1957. Further studies in tissue homo-transplantation in cattle. J. Embryol. exp. Morph., 5: 351.Google Scholar
Bissonnette, T., 1928. Notes on multiple pregnancies in cattle, with special reference t o three cases of prenatal triplets and the freemartins involved. Amer. J. Anat., 42: 29.CrossRefGoogle Scholar
Brody, S., 1945. Bioenergetics and Growth. Reinhold Publishing Corporation, New York. Ch. 17.Google Scholar
Hunter, J., 1792. Animal Oeconomy. London.Google Scholar
Keller, K., 1916. Die Körperform des unfruchtbaren Zwillinge beim Rinde. Jahr. wiss. Prakt. Tierz., 10: 103.Google Scholar
Magnusson, H., 1918. Geschlechtlose Zwillinge. Eine gewöhnliche Form von Herma-phroditismus beim Rinde. Arch. Anat. Physiol. (Lpz.), 29.Google Scholar
Pearl, R., 1912. A case of triplet calves, with some general considerations regarding multiple gestation in normally uniparous animals. Bull. 204, Maine agr. Exp. Sta., 259.Google Scholar
Robinson, T., 1957. In Progress in the Physiology of Farm Animals. Ed. J. Hammond. Butterworths Scientific Publications, London. Vol. 3. Ch. 18. Pregnancy.Google Scholar
Swett, W., Matthews, C., & Graves, R., 1940. Early recognition of the free-martin condition in heifers twinborn with bulls. J. agric. Res., 61: 587.Google Scholar
Tandler, J., & Keller, K., 1910. Über den Einfluss der Kastration auf den Organismus, IV. Die Körperform der weiblichen Friihkastraten des Rindes. Arch. Entw Mech. Org., 31: 289.Google Scholar
Wallace, R., 1923. Farm Livestock of Great Britain. Oliver & Boyd, Edinburgh. 5th ed.Google Scholar