SUMMARY We report the status and prospectives of an ongoing 'hyperprolific' selection experiment in Landrace pigs in Spain. Around 3500 females were available for selection. The whole population was evaluated using a BLUP animal model. Two selected lines of 1 / 5 females were founded. Males were obtained from best 25 matings. A control line consisting of 200 females and 15 males was established as well. All animals were allocated in a single breeding farm. One female offspring from each dam will be produced and there will be two measurements of litter .size on each of these offspring. A parallel simulation study suggests that a genetic increase of about 0.35 - 0.40 piglets can be expected.

L. Alfonso, J. L Noguera, D. Babot, J. Estany

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 347–350, 1994
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