Abstract
Generally speaking, the majority of F1 hybrids between the horse and donkey are sterile and do conform to the hypothesis of gametogenic breakdown. The results of our own research, nevertheless, lead us to conclude that there is variability in degree of sterility and fertility for both F1 and B1 individuals, with a gradual advance from sterility to fertility being seen. This is the subject we will discuss from the points of view of oestrus, ovulation, mating, pregnancy, spermatogenesis, endocrine activity, isozymes and karyotypic analysis in this paper.
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References
Anderson, W S. 1939. Fertile mare mules. J Hered, 30, 549–551.
Basrur, P K, Basrur, V R, and Gilman, J P W. 1963. A simple method for short term cultures from small biopsies. Exp Cell Res, 30, 229–232.
Benirschke, K, Brownhill, L E, and Beath, M M. 1962. Somatic chromosomes of the horse, the donkey and their hybrids, the mule and the hinny. J Reprod Fertil, 4, 319–326.
Benirschke, K, and Sullivan, M. 1966. Corpora lutea in proven mules. Fertility and Sterility, 17, 24–33.
Benirschke, K, Low, R J, Sullivan, M, and Carter, R M. 1964. Chromosome study of an alleged fertile mare mule. J Hered, 55, 31–38.
Bielanski, W, and Zapletal, Z. 1968. Ovulation in she-mules; a report of two cases. Proc 6th Int Cong Animal Reprod and Artificial Insemination, Paris, 2, 1555–1558.
Chandley, A C. 1981. Does ‘affinity hold the key to fertility in the female mule’? Genet Res Camb, 37, 105–109.
Chandley, A C, Jones, R C, Dott, H M, Allen, W R, and Short, R V. 1974. Meiosis in interspecific equine hybrids. I. The male mule (Equus asinus E. caballus) and hinny (E. caballus x. asinus). Cytogenet Cell Genet, 13, 330–341.
Chen, T R. 1974. A simple method to sequentially reveal Q and C-bands on the same metaphase chromosomes. Chromosoma, 47, 147–156.
Cheng, Guangchao, Wang, Li, Ding, Yurong, Su, Dongduen. 1986. A primary observation of the chromosomes in somatic cells of F3 from Cairina Moschata Domes-tica and Gaoyou Anas. Thesis for the Chinese National Scientific Seminar on Animal Hybrida, pp. 61–62.
Cuénot. 1947. Species, translated by Zhou Taixuan. Commercial Press, 180–183.
Deklenev, E N. 1984. The growth and reproductive factor of the hybrids from Java Bos gaurus and Bos taurus, abstracted and translated by Zhou Hongsun. Animal Science Digest, 4, 6.
Eldridge, F, and Blazak, W F. 1976. Horse, ass, and mule chromosomes. J Hered, 67, 361–367.
Eldridge, F, and Suzuki, Y. 1976. A mare mule-dam or foster mother? J Hered, 67, 353–360.
Hare, W C D, and Singh, E L. 1979. Cytogenetics in Animal Reproduction, Commonwealth Agricultural Bureau.
Kaminski, M, and Gajos, E. 1964. Comparative examination of carboxylic esterases in sera of horse, donkey and their hybrids. Nature, 201, 716–718.
Shengli, Li, Ande, Liu, Youyu, Cai, Yu, Liu, Shuhua, Li, and Changlong, Xu. 1980. The study of karyotypes of lymphocyte in peripheral blood from horse, ass, mules and hinnies. Thesis for the seminar on reproductive biology.
Richer, C L, and Romagnano, A. 1985. Cell synchronization and dynamic G banding of equine chromosomes by bromodeoxyuridine. J Hered, 76, 375–376.
Rong, R, Cai, H, Yang, X, and Wei, J. 1985. Fertile mule in China and her unusual foal. J Roy Soc Med, 78, 821–826.
Rong, R, Chandley, A C, Song, J, McBeath, S, Tan, P P, Bai, Q, and Speed, R M. 1988. A fertile mule and hinny in China. Cytogenet Cell Genet, 47, 134–139.
Ryder, O A, Chemnick, L G, Bowling, A T, and Benirschke, K. 1985. Male mule qualifies as the offspring of a female mule and jack donkey. J Hered, 76, 379–381.
Ryder, O A, Epel, N C, and Benirschke, K. 1978. Chromosome banding studies of the Equidae. Cytogenet Cell Genet, 20, 323–350.
Dongduen, Su, Yurong, Ding, and Yixun, Zhang. 1986. Observation of reproductivity of hybrids from Cairina Moschata Domestica and Gaoyou Anas. Thesis for the Chinese National Scientific Seminar on Animal Hybrida, pp. 58–60.
Taylor, M J, and Short, R V. 1973. Development of the germ cells in the ovary of the mule and hinny. J Reprod Fert, 32, 441–445.
Trujillo, J M, Stenius, C, Christian, L, and Ohno, S. 1962. Chromosomes of the horse, the donkey and the mule. Chromosoma, 13, 243–248.
Trujillo, J M, Ohno, S, Jardine, J H, and Atkins, N B. 1969. Spermatogenesis in a male hinny: Histological and cytological studies. J Hered, 60, 79–84.
Songzong, Zhang, Rueixian, Chen, Yuanzhong, Lai, and Yixin, Cheng. 1986. Summary of the experiment for the application of hybrid vigor of hybrids between different species and genus of Duck. Thesis for the Chinese National Scientific Seminar on Animal Hybrida, pp. 47–57.
Leyi, Zheng. 1987. Principles and Methods for Animal Classification. High Education Press, Beijing, pp. 85–100.
Enze, Zong. 1954. Discussion of mules' reproductive problem based on the investigations of mules' fertility. Chinese Journal of Animal Husbandry and Veterinary Medicine Science, 1, 12–15.
Enze, Zong, Zhongxian, Cheng, and Guangjiao, Liu. 1955. On mules' reproduction. Bulletin of Biology, 8, 11.
Enze, Zong. 1983. The reproduction of ju (BT) born by female mules. Bulletin of Biology, 3, 17–19.
Enze, Zong, Gengquan, Fan, Haifu, Yin, Baoli, Wang, Caifang, Zang, Mingjing, Sun, and Shuo, Jiao. 1985. A study on the chromosomes of interspecific F2 hybrids between horse and ass. Scientia Agricultura Sinica, 1, 83–85.
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Zong, E., Fan, G. The variety of sterility and gradual progression to fertility in hybrids of the horse and donkey. Heredity 62, 393–406 (1989). https://doi.org/10.1038/hdy.1989.54
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DOI: https://doi.org/10.1038/hdy.1989.54
