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The dynamics of the production performance and the age structure of the brood stock while an attainment of the projected capacity by a pig-breeding farm

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When launching a pig-breeding farm a brood stock is formed in a limited lifespan. Due to that fact the age structure of the herd varies from 1,25 farrowing during the first year to 5,3 during the fourth. The variance of the age structure of the herd goes along with the changes of the average prolificacy from 12,8 to 14,5 animal unit/farrowing/year, which works out from -5,9% to 6,6% pertaining to the performance goal which is 13,6 animal units. It is possible to compensate the shortfall of the farrows by a) the cutting of the suckling period in order to increase the turnover of the herd and number of the farrowings; b) increasing the age and the body weight of the animals for slaughtering in order to reach the target of the pork production. The exclusion of the surplus production of the farrows is reached by the decreasing of a brood stock for ≈100…300 animal units. The cull level of the brood stock during the first ten years of the exploitation of the complex changes from 14,5% to 60% while the cull project target is 50%. The increase or decrease in production or purchase of the herd replacements is needed during such time spans.