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Data on 16 881 lambs of several breed types were analysed for total mortality to 60 days of age, and for perinatal and postnatal mortality. The least-squares analyses included breed, year, season, sex, and linear and quadratic effects of age of dam (model 1), plus litter size (model 2), plus birth...

Gama, L. T.; Dickerson, G. E.; Young, L. D.; Leymaster, K. A.
Institut National de la Recherche Agronomique, Paris, France
Proceedings, 3rd World Congress on Sheep and Beef Cattle Breeding, 19-23 June 1988, Paris. Volume 2., 1988, pp 670-672