Effect of dietary forage: concentrate ratio on the behaviour, rumen fermentation and circulating concentrations of IGF-1, insulin, glucagon and metabolites of beef steers and their potential effects on carcass composition

acide gras volatil aliment pour animaux ammonia ammoniac behaviour boeuf bovin buey bullocks cattle comportamiento comportement comportement alimentaire ensilado ensilage (produit) facteur de croissance igf factor de crecimiento igf feed grasses feed intake feeding habits feeds forage ganado bovino glucagon insulin insulin-like growth factor insulina insuline lolium perenne ph piensos prise alimentaire (animaux) rumination silage steers volatile fatty acids