Although variability of litter size has been documented numerous times, it is difficult to quantify the different factors which determine it. Selection progress for litter size has been negligible or non-existent in spite of significant efforts invested over the past IS years. Differences between breeds have been reported for litter size and litter weight by various authors (Johnson (3), Strang and King (10), SkSrman ( 6 ), Standal (9), Sellier (7), Glodek (2), Locniskar (4), Salehav (12,13), Vangen (15), Skjervold ( 8 )). There appears to be scope for improvement of these traits through appropriate methods of selection in both purebred and crossbred populations.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 7. Symposia (1), , 288–292, 1982
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