Steers grazing endophyte-free tall fescue: seasonal changes in nutrient quality, forage intake, digesta kinetics, ruminal fermentation, and serum hormones and metabolites

ammonia ammonia analysis animal feed animals beef cattle blood blood glucose blood serum body weight cattle chemistry digestion digestion eating fatty acids fatty acids feed intake fermentation festuca arundinacea grazing hormones hydrocortisone insulin metabolism metabolites nutritive value pastures ph physiology poaceae rumen rumen seasonal variation seasons steers volatile fatty acids