translate English to French: Boadi, D.A. and K.M. Wittenberg (2002), Methane production from dairy and beef heifers fed forages differing in nutrient density using the sulphur hexafluoride (SF6) tracer gas technique, Canadian Journal of Animal Science, 82: 201-206.
Statistique Canada, Statistiques démographiques annuelles, 1990-2004, catalogue no 91-213-XIB. CHAPITRE 6, AGRICULTURE Beauchemin, K.A. et S.M. McGinn (2005), Methane emissions from feedlot cattle fed barley or corn diets, Journal of Animal Science, 83(3), p.