7387 2 archive 4461 disk0/00/00/73/87 2006-05-10 2009-09-09 13:39:41 2009-08-20 14:30:35 conference_item show 0 en int_conf_joint2006_7 May 30-31, 2006 Joint Organic Congress Odense, Denmark never 0 TRUE poster Nauta W.J. MSc Brascamp E.W. Prof. Veerkamp R.F. Dr. Bovenhuis H. Dr. pub 5animalbreed This paper is about animal breeding and genotype by environment interaction. This will become more and more part of development of organic animal production. The day before the congress we organize the first workshop on animal breeding, also in Odense and an association on organic animal breeding (Eco-AB) will be set up. Wytze Nauta Abstract – Due to genotype by environment interaction (GxE), conventional bulls might not be suitable for organic production circumstances. Therefore, lactation records from Holstein cows on organic and conventional farms were used to estimate the magnitude of GxE between organic and conventional production circumstances. GxE was quantified by estimating the genetic correlations between production traits in both environments. Genetic correlations for milk and protein yield were between 0.71 and 0.80 and found to be significantly different from unity. For fat yield the correlations were close to 0.90 and not significantly different from unity. It can be concluded that breeding values for yield traits should be adapted to organic production so that the production level of cows fits better to the organic environment resulting in healthier dairy cows. 2006 published public 5624 1 7387 1 other en public

GxEorganic.doc

GxEorganic.doc 40960 http://orgprints.org/7387/1/GxEorganic.doc