Table 2.

Ethogram with the description of behavioral activities performed by dairy heifers when fed with Oregano extract at the feed bunk.

Behavioral traits	Brief description
Latency to visit the feed bunk	Time elapsed since heifers entered the stall in the morning until they put the head in the restrainer (minutes)
Latency to eat the concentrate or silage plus hay	Time elapsed since heifers put the head in the restrainer until they start to eat the concentrate or silage plus hay (minutes)
Time eating the concentrate or silage plus hay	Effective time spent eating the concentrate or silage plus hay without pauses (minutes)
Vocalizations of low magnitude	Number of vocalizations performed with the mouth almost closed during their restrained period at the feed bunk
Vocalizations of high magnitude	Number of vocalizations performed with the mouth wide open during their restrained period at the feed bunk
Sniffing, coughing, sneezing	Number of events when heifer sniffed or coughed or sneezed during their restrained period at the feed bunk
Pauses	Number of times heifers interrupted eating the concentrate during one minute or more during their restrained period at the feed bunk
Tongue rolling	Number of events when heifers rolled their tongue during their restrained period at the feed bunk
Licking the feed bunk	If the feed bunk was licked with abundant production of saliva after concentrate consumption (0 = no, 1 = yes)