Grazing as a form of low input production is increasing in the US. Concern regarding the suitability of conventional AI sires for grazing herds, has resulted in some grazing herds switching to alternative breeding schemes such as crossbreeding, use of sires from established grazing countries, notably New Zealand, and natural service sires. Recent studies by Weigel et al. (1999), and Cromie et al. (1998) have supported the results of numerous other studies, which provide little evidence for significant genotype by environment interaction (GE) for milk production traits. Few studies have reported on GE for somatic cell count and reproductive traits. These traits may attain added importance in grazing herds especially where seasonal calving is practiced. Also, it is possible that GE plays a greater role in traits under less additive genetic control compared to traits with large additive genetic effects for which the accuracy of sire predicted transmitting abilities (PTA) is greater

J. F Kearney, M. M Schutz, Paul J Boettcher, K. A Weigel

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 2002. Session 13, , 13.09, 2002
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