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Die handhawing van genetiese diversiteit deur (1) meer manlike diere in teel programme te gebruik en (2) nie draers uit die genepoel te verwyder nie.

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Rhea Koch

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Topic starter 13th Jun 2022 8:46 am

Die handhawing van genetiese diversiteit deur (1) meer manlike diere in teel programme te gebruik en (2) nie draers uit die genepoel te verwyder nie.

Die genepoel van ‘n geslote ras kan nooit groter word nie, maar, dit kan Kleiner word. Genetiese diversiteit is iets waaroor telers van veral rasse met Kleiner populasies bekommerd behoort te wees. ŉ Kleiner genepoel kan lei tot kwessies soos Kleiner werpsel groottes, verhoogde neonatale sterftes, meer genetiese siektes en verswakte immuniteit in ŉ ras. Dit is nie noodwendig as gevolg van die kwessies van lyn-teling of buite-teling nie, maar eerder as gevolg van die gene wat verlore gaan deur seleksie van telers. Met ander woorde, wanneer ŉ teler alleenlik teel met ŉ beperkte aantal lyne, gaan daar noodwendig van gene verlore in die proses. Een van die grootste faktore is iets wat genoem word “Popular sire syndrome”. Dit is waar ŉ gewilde reun baie gereeld in teel programme gebruik word. Die het ŉ beduidende inpak op die genepoel van ŉ ras, wanneer kwaliteit, onverwante manlike diere nie gebruik word in teel programme nie terwyl hulle eintlik ŉ groot rol kan speel in hulle bydrae tot die gene poel.

Die ander faktor wat bydrae tot die krimpende genepoel in rasegte honde, is om draers uit te sluit uit teel programme. Wanneer daar met ŉ draer en ŉ nie-draer geteel word, het die hondjies ŉ 50% kans om draers te wees en ŉ 50% kans om ŉ nie-draer te wees, maar AL DIE HONDJIES SAL GESOND WEES. Aan die ander kant, as al die draers heeltemal uit die genepoel van ŉ ras verwyder word, sal dit verrykende gevolge inhou vir die honde se genetiese materiaal. Die impak is dalk nie so onmiddellik sigbaar nie, maar as hierdie praktyk vir jare toegepas word sal dit lei tot ŉ dramatiese inkrimping van die genepoel, wat weer sal lei tot ander nuwe, en tans onbekende en skaars afwykings. Danksy tegnologie, kan draers deur ŉ eenvoudige genetiese toets uitgeken word. Dit stel telers in staat om hierdie honde in te sluit in teel programme en sodoende die stabiliteit van die genetika van die ras te handhaaf, sonder die verhoogde risiko van nuwe siektes.

Bronne

Bell, JS. 2011. Small Population Breeds and Issues of Genetic Diversity. Tufts’ Canine and Feline Breeding and genetic conference.

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Die handhawing van genetiese diversiteit deur (1) meer manlike diere in teel programme te gebruik en (2) nie draers uit die genepoel te verwyder nie.

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