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I only found one book which isn't a textbook named Storey's Illustrated Guide to 96 Horse Breeds of North America By Judith Dutson (not sure if it is good enough to follow) that defined these terms.

Outbreeding/ outcrossing is deliberately crossing one line of horse within a breed to a very distant or unrelated line. The term is also occasionally used as a synonym for crossbreeding.

Crossbreeding is the deliberate crossing of horses of different breeds.

My understanding:

Outbreeding or Outcrossing is the mating between two individuals of a breed but different varieties/sub-varieties.

Crossbreeding is the mating between two individuals of different breeds (could be intraspecific or interspecific as well).

Are these definitions correct?

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  • $\begingroup$ The term cross breeding is a bit broader term , whereas outbreeding is more specific. $\endgroup$ – JM97 Dec 31 '16 at 12:16
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Answer in keywords

Inbreeding : related individual,same breed

Outbreeding

  1. Cross breeding : between different breeds

  2. Outcrossing : unrelated individual,same breed,no common ancestor

Detailed answer

Inbreeding it is a mating within the same breed between different superior male and superior female. Inbreeding between close relatives can cause inbreeding depression like decreased Vigour , fertility and productivity. It is therefore advisable to mte superior animals of different population of the same breed .

Outbreeding is mating between unrelated animals of same or different breeds.

Outcrossing is mating between unrelated animals of same breed with no common ancestor for at least 4 to 6 generation. Offspring formed from such a cross is called out cross .

Cross breeding is mating between superior animals of different breeds for raising new breeds for improving local breeds.

Please note: Outcrossing and cross breeding are two types of Outbreeding.

If you have any further doubts please ask . Hope it helps!!

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Some of the information contained in this post requires additional references. Please edit to add citations to reliable sources that support the assertions made here. Unsourced material may be disputed or deleted.

  • $\begingroup$ Welcome. If you can add the definition of Outcrossing, and add appropriate resources (wikipedia would suffice here I guess, given the textbook-question-like-nature of this post) this would make a great answer (imho - I'm not an expert on this topic). For now, no upvote and just a banner. $\endgroup$ – AliceD Oct 24 '18 at 20:36
  • $\begingroup$ The link is broken. Also, please do not post a link only answer. Link only should better be posted as comments. $\endgroup$ – Remi.b Dec 25 '18 at 2:34
  • $\begingroup$ I have updated my answer as suggested. $\endgroup$ – user52599 Dec 28 '18 at 1:21

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