English to Italian Science Agriculture Reduction of Heat Stress in animals

Facendo un po' di ricerca sembra che il termine indichi che i manzi sono stati inseriti nel feedlot da subito, ma non riesco a trovare un termine equivalente in italiano, qualcuno può aiutarmi? Grazie in anticipo.

Contesto:

Calf-fed steers (306 head; BW 263.5 ± 18.6 kg; 36 pens) were utilized in a randomized block design experiment.
Steers were received over a two-day span at the feedlot.
Upon arrival, steers were allowed access to water and were processed, weighed, and allocated to treatment within 12 h.