A note on contrafreeloading in broilers compared to layer chicks
2006 (English)In: Applied Animal Behaviour Science, ISSN 0168-1591, Vol. 101, no 1-2, 161-166 p.Article in journal (Refereed) Published
Contrafreeloading (CFL) is the behaviour where an animal chooses to work for food even when identical food can be obtained without any effort. Previous studies have suggested that the difference in CFL between White Leghorn layers and jungle fowl may be a side effect of selection for increased production traits in the Leghorn strain.
In this experiment we studied to what extent broilers chicks (Cobb/Ross), which are highly selected for fast growth, perform CFL and compared this with a layer strain (Calder Ranger), which grows considerably slower. We predicted that broilers should have a lower degree of CFL compared to the layer strain, as an energy-saving response to the demands of rapid growth.
During 48 h 10 pairs of each breed were given a choice between freely available food and food mixed with wood shavings. Behavioural observations were made twice each day. Broilers showed less CFL (p < 0.05), were more inactive (p < 0.001) and performed less active behaviours (p < 0.05) than layers.
Our results support previous findings that decreased CFL in domestic fowl may indicate adaptive reallocation of energy resources in response to selection for increased production traits.
Place, publisher, year, edition, pages
2006. Vol. 101, no 1-2, 161-166 p.
Contrafreeloading; Resource allocation; Broiler; Laying hen
IdentifiersURN: urn:nbn:se:liu:diva-13000DOI: 10.1016/j.applanim.2006.01.006OAI: oai:DiVA.org:liu-13000DiVA: diva2:17644