Birds trained for public service are simply maintained in public service capacity for 10 years. No sustained corrective management required, and if needed a which is usually within first year or two of life, then duration short.
For a heads up, for a living I am developing through selective breeding a domesticated population / cultigen / breed to be used by farmers for table-meat population. My starting point is based on wild source populations. I am well versed in time investments and genetics (quantitative and qualitative). You seem to be stepping away from theory concerning inheritance when interpreting my statements and then presenting answers that do not jive with my statements.
For a heads up, for a living I am developing through selective breeding a domesticated population / cultigen / breed to be used by farmers for table-meat population. My starting point is based on wild source populations. I am well versed in time investments and genetics (quantitative and qualitative). You seem to be stepping away from theory concerning inheritance when interpreting my statements and then presenting answers that do not jive with my statements.