Abstract
Responses of plasma corticoids to adrenocorticotropic hormone (.32 U/kg body weight) administered during early lactation were measured in dairy cattle consuming large amounts of concentrate feeds and one of the following forage diets: alfalfa-timothy hay plus corn silage, alfalfa-timothy hay crop silage plus corn silage, or corn silage. Concentrations of plasma corticoids increased to maximum in all groups within 60 to 90min. Concentrations remained at near maximum for 4 to 5h and then declined to baseline. Maximum corticoid concentrations following adrenocorticotropic hormone injection differed among forage treatment groups. Responses of corn silage and hay crop silage groups (46.7±1.1 and 50.1±2.4ng/ml) did not differ but were less than those in the hay group (65.5±2.9ng/ml). Response measured as area under the curve of plasma corticoid response also differed among forage treatments: hay 443±17h (ng/ml)>hay crop silage 334±34>corn silage 245±36. Results are discussed in terms of stress susceptibility in dairy cattle consuming diets containing large amounts of silage.
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