Improvement of the production efficiency of beef cattle in intensive systems with suckling cows is directly related to the number of marketed calves per breeding cow. Among the factors affecting this variable, p rolificacy represents a main one which may be improved by genetic means (JOHANSSON et al., 1974; MAIJALA and SYVAJARVI, 1977; PIPER and BINDON, 1979).
After having estimated the frequency of twinning, via on-the-farm records of cows from different French beef breeds, it seemed of interest to create a herd of females with good twinning ability (MENISSIER and FREBLING, 1974) and to examine the performance of the foundation cows (Gn) and of their daughters (Gi) in the same herd.
The purpose of this paper is to report the results obtained from 9 (G0) and 7 (G-|) calving periods.

J. Frebling, P. Gillard, F. Menissier

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 8. Symposia (2), , 351–355, 1982
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