Detailed profile of this breed: origin, year of creation, recognised varieties and official approvals.
Summary of the breed
I cannot locate a credible source listing 'SLENKE_DE_GUELDRE' as a recognized pigeon breed. Without reliable references, I cannot provide qualitative or quantitative characteristics. Please verify the spelling or provide an alternative name. If you wish, I can offer a profile for a well-documented Gelderland pigeon variety as a substitute.
Detailed origin
No credible historical source confirms this name as a pigeon breed. Consequently, I cannot provide a detailed origin with dates, regions, or lineage.
Detailed description
Because there is no verified breed profile, I cannot give a precise qualitative or quantitative description (size, body shape, coloration, feather patterns, temperament) or quantitative data (average wingspan, weight range, life expectancy, productivity). If you supply a reliable reference or an alternative breed, I will deliver a complete, data-driven profile.