The attention paid to litter size by the applied research, in spite of great complexity and the difficulty of its analysis, is justified by the economic interest of this trait.
It is plain (MATHERON and MAULEON, 1979) that both biological functions of the dam and of her products intervene simultaneously in litter size. This means that part of the expressed variability will be due to the individual genotype and part to maternal and grand-maternal effects.
This work was conducted to obtain estimates of the direct and maternal effects that influence on numeric traits and indications about the possible grand-maternal effects.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 7. Symposia (1), , 557–562, 1982
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