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  • Title: Does nutritive and non-nutritive sucking reduce other oral behaviors and stimulate rest in calves?
    Author: Veissier I, de Passillé AM, Després G, Rushen J, Charpentier I, Ramirez de la Fe AR, Pradel P.
    Journal: J Anim Sci; 2002 Oct; 80(10):2574-87. PubMed ID: 12413079.
    Abstract:
    After a milk meal, bucket-fed calves show non-nutritive oral activities, including cross-sucking, and this can discourage producers from rearing them in groups. Sucking is known to induce a quiet state in humans and rats. We examined if nutritive sucking affects non-nutritive oral activities in calves, if it reduces arousal (assessed through behavior and cardiac activity), and if sucking a dry teat can compensate for the lack of nutritive sucking. In Exp. 1, the behavior and the cardiac activity of individually housed calves fed milk from a bucket were compared to those of calves fed milk through a teat. During the meal, the heart rate of bucket-fed calves was higher than that of teat-fed calves (P < 0.0001). After the meal, only bucket-fed calves displayed bar sucking. Compared to the teat-fed calves, they spent more time licking their pen or their neighbor (P < 0.001 and P < 0.05), their heart rate was less variable (P < 0.01), and they lay down with the head unsupported by the neck less quickly (latency to lie down: 51 min vs 42 min, P < 0.05). In Exp. 2, individually-housed bucket-fed and teat-fed calves were observed with or without access to a non-nutritive teat after the meal. Bucket-fed calves sucked the dry teat for longer than teat-fed calves (P < 0.001). In bucket-fed calves, access to the dry teat reduced the time spent nibbling (P < 0.01) and tended to shorten the latency to lie down (P < 0.10). In Exp. 3, group-housed bucket-fed calves were compared with group-housed calves fed with an automatic teat feeder system. Bucket-fed calves spent more time nibbling at 1 mo, but at 3 mo they spent less time nibbling and cross-sucking; they drank more milk and put on more weight. We conclude that, for calves housed individually, teat-feeding reduces non-nutritive oral activities after the meal and induces a calmer state than bucket-feeding. Providing calves with a dry teat partly compensates for the lack of nutritive sucking. For calves housed in groups, the use of an automatic teat feeder may not reduce calves' motivation for sucking. No improvement of growth was observed with teat-feeding either with a teat-bucket or with an automatic feeder.
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