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On some Factors controlling Fertility in Domestic Animals

Published online by Cambridge University Press:  27 March 2009

John Hammond
John Hammond
Affiliation:
(School of Agriculture, Cambridge University.)
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Extract

After a consideration of the ways in which the fertility of domestic animals is controlled some of the factors which limit it have been investigated. Various circumstances control the number of ova shed at each heat period. Data are presented which show that the low fertility of young as compared with adult sows is due to the fact that not so many ova are shed at each period.

Counts have been made of the number of corpora lutea present in the ovaries and number of foetuses present in the uteri of pregnant rabbits and pigs. The results show that many more ova are shed at the heat period than young are produced at birth. Some ova possibly may be lost but many after fertilization atrophy at some period of their development and undergo absorption in utero.

While the occurrence of atrophic foetuses only causes reduced fertility in animals which have many young at birth yet their occurrence in animals producing only one young would give rise to sterility so that the problem of the cause of the atrophy becomes an important one.

Investigation points to the conclusion that the atrophy is not bacterial in origin since frequently healthy and atrophic foetuses lie side by side in the uterus. Moreover no bacteria could be found either in the foetus or foetal membranes.

Evidence is given to show that nutrition cannot be the cause of the atrophy although it may affect to a certain extent the size of the young.

No conclusion has yet been arrived at as to the cause of the atrophy, and the several possibilities suggested are still under investigation.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 6 , Issue 3 , September 1914 , pp. 263 - 277
Copyright
Copyright © Cambridge University Press 1914

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References

page 263 note 1 Pearl, , Jour. Exp. Zool. Vol. XIII. 1912.Google Scholar

page 263 note 2 Heape, , Proc. Roy. Soc. B, Vol. LXXVI. 1905.Google Scholar

page 263 note 3 Sandes, , Proc. Linnean Soc. N.S.W. Vol. XXVIII. 1903.Google Scholar

page 264 note 1 Benthin, , Arch. f. Gynaek. Bd. XCIV. 1911.Google Scholar

page 264 note 2 Schottländer, , Arch. f. mikros. Anat. Bd. XLI. 1893.Google Scholar

page 264 note 3 Heape, , Jour. Roy. Agric. Soc. Vol. X. 1899.Google Scholar

page 264 note 4 Marshall, , Trans. Highland and Agric. Soc. Vol. XX. 1908.Google Scholar

page 264 note 5 Darwin, , The Variation of Animals and Plants under Domestication, Vol. II. Popular edition, London, 1905.CrossRefGoogle Scholar

page 264 note 6 Bos, Bitzema, Biol. Centrbl. Bd. XIV. 1894.Google Scholar

page 264 note 7 von Guaita, Ber. d. Naturf. Gesell., Freiburg, Bd. X. 1898.Google Scholar

page 264 note 8 Castle, Carpenter, Clarke, Mast and Barrows, Proc. Amer. Acad. of Arts and Sci. Vol. XLI. 1905–1906.Google Scholar

page 265 note 1 Stephenson, , Jour. Roy. Agric. Soc. Vol. XXI. 2nd series, 1885.Google Scholar

page 266 note 1 Pearl, , Jour. Exp. Zool. Vol. XIII. 1912.Google Scholar

page 266 note 2 Minot, , Amer. Jour. of Physial. Vol. XII. 1891.Google Scholar

page 266 note 3 Wallace, , Farm Live Stock of Great Britain, Edinburgh, 1907.CrossRefGoogle Scholar

page 267 note 1 Rommel, , U.S. Dept. Agr., Bur. Anim. Indust. Ciro. No. 95, 1906.Google Scholar

page 267 note 2 Surface, Biometrika, Vol. VI. 1908–1909.Google Scholar

page 268 note 1 Todyo, , Arch. f. Gynaek. Bd. XCVIII. 1912.Google Scholar

page 268 note 2 Hill, , Quar. Jour. Microp. Sci. Vol. LVI. 1911.Google Scholar

page 269 note 1 Strahl, and Henneberg, , Anat. Anz. Bd. XX. 1902.Google Scholar

page 269 note 2 de Bruin, , Bovine Obstetrics (trans.), London, 1901.Google Scholar

page 269 note 3 Craig, , Fleming’s Veterinary Obstetrics, London, 1912.Google Scholar

page 269 note 4 Galabin, and Blacker, , The Practice of Midwifery, London, 1910.Google Scholar

page 269 note 5 Parker, and Bullard, , Proc. Amer. Soc. of Arts and Sci. Vol. XLIX. 1913.Google Scholar

page 270 note 1 Bd. of Agric. and Fish., Rep. Com. on Epizootic Abortion, Cd. 7157.

page 270 note 2 Hill, and O’Donoghue, , Quar. Jour. Microp. Sci. Vol. LIX. 1913.Google Scholar

page 271 note 1 Everard, , Science, Vol. XXXVIII. No. 972, 1913.Google Scholar

page 273 note 1 Fraenkel, , Arch. f. Gynaek. Bd. LXVIII. 1903.Google Scholar

page 273 note 2 Strahl, and Henneberg, , Anat. Anz. Bd. XX. 1902.Google Scholar

page 273 note 3 Marshall, , The Physiology of Reproduction, London, 1910.Google Scholar

page 274 note 1 Hyde, quoted from Morgan’s Heredity and Sex, p. 199.

page 274 note 2 Bauer, , Zeits. f. indukt. Abstam. u. Vererbungslehre, Bd. I. 1908 and Bd. III. 1910.Google Scholar

page 274 note 3 Cuénot, , Arch. Zool. exp. et gén., T. IX. 1908–1909.Google Scholar

page 274 note 4 Bell, Blair, The Principles of Gynaecology, London, 1910.Google Scholar

page 274 note 5 Morgan, , Heredity and Sex, New York, 1913.Google Scholar

page 274 note 6 Jennings, Jour. Exp. Zool. Vol. XIV. 1913.Google Scholar

page 274 note 7 Centi, Arch. Ital, dc Biol. T, XLVIII. 1907.Google Scholar

page 275 note 1 Stockard, and Craig, , Arch. f. Entwick. Bd. XXXV. 1913.Google Scholar

page 275 note 2 Koehner, , Arch. f. Gynaek. Bd. XCI. 1910.Google Scholar

page 275 note 3 Further investigation has shown that degenerate foetuses do occur in wild rabbits but not to the same extent as in the domesticated breeds.