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发表于 2008-12-1 02:57:00
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来自： 四川遂宁
<span class="mw-headline">Coat genetics</span>
<p>Dogs have a great deal of diversity in breeds, in all aspects, including coat color and patterns. Canine coat genetics are still being researched. Most of our present understanding of canine coat genetics is based on the work of Clarence Cook Little, author of "Inheritance of Coat Color in Dogs" (1979), although some researchers dispute certain of his theories. For those with a keen interest in canine coat genetics, an excellent source for the breeder and the layperson's understanding is authored by Dr. Sue Ann Bowling <a class="external autonumber" title="http://bowlingsite.mcf.com/Genetics/ColorGen.html" href="http://bowlingsite.mcf.com/Genetics/ColorGen.html" rel="nofollow">[1]</a></p>
<p>As far as the Presa Canario is concerned, it is believed <a class="mw-redirect" title="Fawn" href="http://en.wikipedia.org/wiki/Fawn">Fawn</a> is based on the Agouti series, specifically the ay allele. Agouti hairs are fawn hairs banded and/or interspersed with black. This gene is recessive to the other genotype of the breed, brindle.</p>
<p>It is known that <a title="Brindle" href="http://en.wikipedia.org/wiki/Brindle">Brindle</a> is a dominant trait but there is some argument as to where it is located. Little postulated that it was on the E series (Ebr) but if so, would compete with the black mask (Em), which is known to not be the case. Dr. Bowling speculates the gene is most likely on a new series, which she calls "K".</p>
<p><b>The following are true in canine coat genetics:</b> (remembering alleles come in sets of 2)</p>
<p>1. Breeding fawn (ayay) x brindle (KbrKbr or Kbray) may produce: fawn and brindle offspring.</p>
<p>2. Breeding brindle (KbrKbr or Kbray) x brindle (KbrKbr or Kbray) may produce: fawn and brindle offspring.</p>
<p>3. Breeding fawn (ayay) x fawn (ayay) will <b>always</b> produce: <b>fawn</b> offspring.</p>
<p>For breedings of fawn x brindle or brindle x brindle there is no clear way to predict the number of fawn or brindle offspring. Some litters from these breedings will be entirely fawn, entirely brindle, or, most likely, some combination of both.</p>
<p><a id="Temperament" name="Temperament"></a></p>
<h2><span class="editsection">[<a title="Edit section: Temperament" href="http://en.wikipedia.org/w/index.php?title=Perro_de_Presa_Canario&action=edit&section=6">edit</a>]</span> <span class="mw-headline">Temperament</span></h2>
<p> resas are of strong character and are dominant animals requiring early socialization and obedience training.<sup class="reference" id="cite_ref-UPPCC2_5-0"><a title="" href="http://en.wikipedia.org/wiki/Presa_Canario#cite_note-UPPCC2-5"><span>[</span>6<span>]</span></a></sup><sup class="reference" id="cite_ref-FAQ_6-0"><a title="" href="http://en.wikipedia.org/wiki/Presa_Canario#cite_note-FAQ-6"><span>[</span>7<span>]</span></a></sup> In some situations, the Presa can be aggressive toward other dogs and suspicious of strangers.<sup class="reference" id="cite_ref-canada_7-0"><a title="" href="http://en.wikipedia.org/wiki/Presa_Canario#cite_note-canada-7"><span>[</span>8<span>]</span></a></sup> Once the dog has been properly socialized and trained, this becomes the exception rather than the rule. Many Presas share their homes with children, other dogs, cats, horses and other farm animals.<sup class="reference" id="cite_ref-FAQ_6-1"><a title="" href="http://en.wikipedia.org/wiki/Presa_Canario#cite_note-FAQ-6"><span>[</span>7<span>]</span></a></sup></p>
<p><a id="Trainability" name="Trainability"></a></p>
<h2><span class="editsection">[<a title="Edit section: Trainability" href="http://en.wikipedia.org/w/index.php?title=Perro_de_Presa_Canario&action=edit&section=7">edit</a>]</span> <span class="mw-headline">Trainability</span></h2>
<p>Due to its temperament, the Presa Canario can be a challenge to train. They require a firm owner who is willing and able to meet the challenges a young, dominant puppy may pose. The breed is not traditionally suited for protection sports but it is gaining in popularity due to a small group of enthusiasts who have selected dogs based heavily on function. The Perro de Presa Canario is not recommended for the first time dog owner.<sup class="reference" id="cite_ref-canada_7-1"><a title="" href="http://en.wikipedia.org/wiki/Presa_Canario#cite_note-canada-7"><span>[</span>8<span>]</span></a></sup></p>
<p><a id="Health" name="Health"></a></p>
<h2><span class="editsection">[<a title="Edit section: Health" href="http://en.wikipedia.org/w/index.php?title=Perro_de_Presa_Canario&action=edit&section=8">edit</a>]</span> <span class="mw-headline">Health</span></h2>
<p>As with any breed, those interested in purchasing a Presa Canario should carefully research breeders and a dog's ancestry to ensure that the breeding lines are healthy. Typically speaking, the higher the degree of consanguinity, the higher the likelihood of genetic defects. Due to the breed's vast gene pool, many of the genetic problems that affect other purebreeds are less evident. However, as the breed becomes more tightly interbred and bloodlines developed the incidence of genetic problems may increase.</p>
<p>As a large breed, the Presa Canario can be susceptible to <a title="Hip dysplasia="dysplasia" (canine)" href="http://en.wikipedia.org/wiki/Hip_dysplasia_(canine)">hip dysplasia</a>.<sup class="reference" id="cite_ref-FAQ_6-2"><a title="" href="http://en.wikipedia.org/wiki/Presa_Canario#cite_note-FAQ-6"><span>[</span>7<span>]</span></a></sup> Other reported health problems include patellar luxation and patellar evulsions, skin cysts, <a title="Epilepsy" href="http://en.wikipedia.org/wiki/Epilepsy">epilepsy</a>, <a class="mw-redirect" title="Osteochondrodysplasias" href="http://en.wikipedia.org/wiki/Osteochondrodysplasias">osteochondrodysplasias</a>, <a class="mw-redirect" title="Demodectic mange" href="http://en.wikipedia.org/wiki/Demodectic_mange">demodectic mange</a> and <a title="Cryptorchidism" href="http://en.wikipedia.org/wiki/Cryptorchidism">cryptorchidism</a>.<sup class="reference" id="cite_ref-FAQ_6-3"><a title="" href="http://en.wikipedia.org/wiki/Presa_Canario#cite_note-FAQ-6"><span>[</span>7<span>]</span></a></sup> A health issue unique to Spain is canine visceral <a title="Leishmaniasis" href="http://en.wikipedia.org/wiki/Leishmaniasis">leishmaniasis</a>. Leishmaniasis is a blood parasite that has a long incubation period (of several years) and most often leads to death.</p> |
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发表于 2008-12-3 13:12:00
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来自： 上海
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