Jackal–dog hybrid

Three hybrids between golden jackals and domestic dogs found in Croatia

A jackal–dog hybrid is a canid hybrid resulting from a mating between a domestic dog and a golden jackal. Such crossbreeding has occurred numerous times in captivity,[1][2][3][4] and was first confirmed to occasionally happen in the wild in Croatia in 2015.[5] It is believed that the domestic dog cannot hybridise with other species of jackal, outside of the Canis genus, namely the Side-striped jackal (Lupulella adusta), or the Black-backed jackal (Lupulella mesomelas).

Similar matings between golden jackals and grey wolves have never been observed, though evidence of such occurrences was discovered through mtDNA analysis on jackals in Bulgaria.[6] Although no genetic evidence has been found of grey wolf-jackal hybridization in the Caucasus Mountains, some cases exist where otherwise genetically pure golden jackals have displayed remarkably grey wolf-like phenotypes, to the point of being mistaken for wolves by trained biologists.[7]

History[edit]

Scottish surgeon and amateur naturalist John Hunter was the first to write an account of the two species' interfertility in 1787. He described how a ship captain of the East India Company adopted a female jackal and had it mated to his spaniel, after which it whelped six pups upon arriving in England. Hunter purchased one of the female hybrid pups and attempted to mate it with several dogs upon reaching maturity. Further crossbreeding experiments were initially hampered by the hybrid female's apparent disinterest in the dogs brought to it, though it subsequently mated with a terrier and produced five pups.[1]

Marie Jean Pierre Flourens attempted his own crossbreeding experiments nearly a century later, noting that first-generation matings between the two species tended to produce animals in which jackal characteristics were dominant, having straight ears, hanging tails, lack of barking, and wild temperaments.[2] A similar observation was made by Robert Armitage Sterndale, who recorded a jackal-dog crossbreeding experiment spanning several generations in British India, noting that glaring jackal traits could be exhibited in hybrids even after three generations of crossing them with dogs.[3] Flourens, however, observed that his jackal hybrids became sterile after the fourth generation, but could be mated back to either parent species.[2]

Charles Darwin wrote of a first-generation hybrid kept in the London Zoo which was completely sterile, though he noted that this was an exceptional case, as first-generation hybrids have been known to reproduce successfully. He criticized Flourens's earlier experiments, noting that the specimens he used were all closely related; thus, their subsequent sterility would have been explainable as a result of inbreeding.[8]

Breeding experiments in Germany with poodles and jackals and later on with the resulting dog–jackal hybrids showed a decrease in fertility and significant communication problems, as well as an increase of genetic diseases after three generations of interbreeding between the hybrids, unlike with wolfdogs, which remain healthy and never become sterile.[9] These "puchas" (poodle-jackals), like the "pucos" (poodle coyotes), exhibited much less domestic dog-like behaviour than the wolf-hybrids.[10]

In 2015, hybridization between golden jackals and domestic dogs in the wild was confirmed when three specimens with anomalous traits were harvested in Croatia and had their genetic markers analyzed. Two of the specimens, a light-colored female and a melanistic male, were very jackal-like in appearance, save for their coloration and rounded ears, while one was much more doglike, lacking the jackal's conjoined middle paw pads and sporting dewclaws and a white coat with brown patches. This last specimen was thought to be the pup of the female, which had likely backcrossed with a stray Istrian Shorthaired Hound.[5]

Sulimov dog[edit]

Sulimov dogs

The Sulimov dog originated in Russia from an initial hybrid between arctic reindeer-herding huskies and golden jackals to produce one-quarter jackal hybrids. The hybrid was developed by Klim Sulimov, a Senior Research Assistant at the D.S. Likhachev Scientific Research Institute for Cultural Heritage and Environmental Protection.[11] The resulting breed was thought to have the jackal's power of scent and the husky's resistance to cold. During recent years, Aeroflot has used them for airport security as detection dogs to sniff out explosives otherwise undetectable by machinery.[4][12][11]

Their breeding program dates back to 1975, but was not applied to bomb detection until 2002. At the start of the breeding process, male jackal pups had to be fostered on a Lapponian Herder bitch to imprint the jackals on dogs. Female jackals accepted male dogs more easily. The half-breed jackal-dogs were hard to train and were bred back to Huskies to produce quarter-bred hybrids (quadroons). To improve trainability, other dogs were bred into the line: a Nenet Herding Laika, a Fox Terrier, and a Spitz. These hybrids were small, agile, and trainable and had excellent noses. The jackal–dog hybrids were bred together for seven generations to establish the breed. The result was an easily trainable dog with a superior sense of smell, called Sulimov dogs after their creator.[citation needed]

As described by Sulimov:

My dogs combine the qualities of Arctic reindeer herding dogs, which can work in temperatures as low as −70°C, and jackals which enjoy the heat up to +40°C. They're perfect for our country."[13]

Twenty-five Sulimov dogs are used by Aeroflot at Sheremetyevo Airport in Moscow, for functions which include bomb-sniffing. They may one day be registered as a breed of working dog, but at present only about 40 Sulimov dogs exist, and all are the property of Aeroflot. They are trained from puppyhood to recognize 12 components of explosives. Unlike more common sniffing dogs, they take the initiative in searching.[14][15]

References[edit]

  1. ^ a b Hunter, J. (1787). Observations tending to show that the Wolf, Jackal, and Dog are all the same species. Phil. Trans., and Animal Œconomy, 2nd Edit.
  2. ^ a b c Flourens, P. (1855), De la Longévité Humaine et de la Quantité de Vie sue le Globe, Paris: Garnier Frères, Libraires-Éditeurs, 2nd ed. pp. 152-154
  3. ^ a b Sterndale, R. A. (1884), Natural History of the Mammalia of India and Ceylon, London: W. Thacker and Co. pp. 238-239.
  4. ^ a b Helen Briggs, Jackal blood makes 'perfect' sniffer dogs, BBC News (9 May 2002)
  5. ^ a b Galov, Anna, et al. First evidence of hybridization between golden jackal (Canis aureus) and domestic dog (Canis familiaris) as revealed by genetic markers. Royal Society Publishing. 2 December 2015. DOI: 10.1098/rsos.150450
  6. ^ Moura, Andre E.; et al. (2013). "Unregulated hunting and genetic recovery from a severe population decline: the cautionary case of Bulgarian wolves". Conservation Genetics. 14 (2): 405–417. doi:10.1007/s10592-013-0547-y.
  7. ^ Kopaliani, N. et al. (2014), "Gene Flow between Wolf and Shepherd Dog Populations in Georgia (Caucasus)", Journal of Heredity, 105 (3): 345 DOI: 10.1093/jhered/esu014
  8. ^ Darwin, Charles (1868). The Variation of Animals and Plants under Domestication. Volume 1 (1st ed.). London: John Murray. pp. 32–33.
  9. ^ Doris Feddersen-Petersen, Hundepsychologie, 4. Auflage, 2004, Franck-Kosmos-Verlag 2004
  10. ^ Der Hund, Abstammung- Verhalten – Mensch und Hund, Erik Zimen, 1. Auflage, 1988, C. Bertelsmann Verlag GmbH, München
  11. ^ a b Viegas, Jennifer. "Jackal-dog created for airport security". Animal Planet. Archived from the original on 22 November 2010.
  12. ^ Steven Rosenberg, Russian airline's top dogs fight terror, BBC News (13 December 2002)
  13. ^ "Russian airline's top dogs fight terror". BBC News. 13 December 2002.
  14. ^ The Science of Dogs (DVD promotional video clip). National Geographic. shows Sulimov dogs at work
  15. ^ The Science of Dogs (documentary DVD). National Geographic. 2011.