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In UK, only 3.0% of pig services are by AI. Of these, 12% are in nucleus herds, 30% for multiplication, and 58% to produce slaughter pigs. In the UK national boar stud (Landraces and Large Whites), mean selection intensity was 2.452 σ, and mean age 25.3 months. These data, together with estimates...

Walters, J. R.; Hooper, P. N.; Green, C. G.
The Hague, Netherlands
35th Annual Meeting of the EAAP, The Hague, Netherlands, 6-9 August 1984. Vol. 2. Summaries. Study Commissions. Cattle, sheep and goats, pigs, horses., 1984, Paper No. P2c.4, pp 2 pp.