Automated Feeding Behaviors Associated with Subclinical Respiratory Disease in Preweaned Dairy Calves

The Results report that calves with clinical BRD drank significantly slower than calves with subclinical BRD or no BRD, contrary to the claimed similarity in drinking rates. The Discussion does support the separate possibility that some calves classified as normal had recovered from BRD before enrollment. (LLM, conf=0.93)

Checked by a reasoning model — may be wrong.

The Discussion reports that Knauer et al. observed no feeding-behavior differences between calves with clinical BRD and controls after the day BRD was identified. It therefore considers it unlikely that effects of BRD before enrollment would persist, but it does not establish that those effects were not sustained in this study; calves were not enrolled until 21 days of age. (LLM, conf=0.84)

The Discussion explicitly identifies potential selection bias because only calves that survived until 21 days of age were eligible for enrollment. The claim’s strict age cutoff is not supported: Materials and Methods reports enrollment at 21 ± 6 days of age, rather than only after 21 days. (LLM, conf=0.85)

The Results report that calves with clinical respiratory disease drank more slowly than calves with subclinical disease or no disease, and the Discussion links slower drinking to possible sickness behavior. But the Results found no difference in milk intake between groups, and the paper does not establish that slower drinking led to diminished daily weight gains. Pages are not provided in our copy. (LLM, conf=0.87)

The Discussion (page unavailable) associates clinical BRD with lethargy and says sickness behaviors are thought to conserve energy for the febrile response to illness. It does not establish reduced activity across calves with BRD: the study measured feeding behavior, and the authors suggest calves with subclinical BRD may not exhibit those sickness behaviors. (LLM, conf=0.84)