Data from the national Swedish pig progeny station testing scheme from the 1980s have been analysed in order to
 estimate the realised generation intervals and selection differentials for the T andrace and Yorkshire breeds. The average generation interval was close to 2 years for both breeds. Selection differentials were, on average, higher for growth rate during test period than for lean percentage in carcass. Selection differentials for osteochondrosis, recorded after slaughter and included in the progeny test index, do not indicate any negative genetic trend.

N. Lundeheim, K. Johansson, L. Rydhmer, K. Andersson

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 378–381, 1994
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