title: Higher inclusion rate of canola meal under high ambient temperature for broiler chickens.
abstract: Extruded canola meal (ECM) was included in diet of broiler chickens at 0, 10, 20, and 30% (wt/wt) from 1 to 35 days of age. A total of 240 day-old male chicks were assigned in groups of 5 to 48 battery cages in environmentally controlled chambers and diets were replicated with 12 cages/treatment. From d 29 to 35, birds from each dietary group were exposed to either thermoneutral (23 ± 1°C; unheated) or high (36 ± 1°C; heated) temperature conditions. High ambient temperature, irrespective of ECM inclusion, depressed the growth performance of birds. Inclusion of ECM increased feed conversion ratio (FCR) linearly in unheated birds during d 1 to 28 (P < 0.001) and d 29 to 35 (P = 0.001). However, no adverse effects of ECM inclusion were observed on the growth performance of heated birds. The absence of these detrimental effects could be associated with the lack of triiodothyronine (T3) elevation by ECM inclusion in heated birds. In conclusion, ECM can be fed, at least, up to 30%, without any adverse effect on growth performance of broiler chickens raised under chronic high ambient temperature.
authors.affiliation: Laboratory of Animal Production, Institute of Tropical Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: A
authors.initials: A
authors.lastname: Aljuobori
authors.affiliation: Laboratory of Animal Production, Institute of Tropical Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia zulidrus@upm.edu.my.
authors.forename: I
authors.initials: I
authors.lastname: Zulkifli
authors.affiliation: Laboratory of Animal Production, Institute of Tropical Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: A F
authors.initials: AF
authors.lastname: Soleimani
authors.affiliation: Laboratory of Animal Production, Institute of Tropical Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia Department of Biochemistry, Faculty of Biotechnology & Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: N
authors.initials: N
authors.lastname: Abdullah
authors.affiliation: Laboratory of Animal Production, Institute of Tropical Agriculture, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia.
authors.forename: J B
authors.initials: JB
authors.lastname: Liang
authors.affiliation: Sumitomo Chemical Enviro-Agro Asia Pacific, Malaysia.
authors.forename: A
authors.initials: A
authors.lastname: Mujahid
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000818:Animals; D001937:Brassica / Q000737:chemistry*; D002645:Chickens / Q000254:growth & development* / Q000378:metabolism*; D004032:Diet / Q000662:veterinary; D004305:Dose-Response Relationship, Drug; D006358:Hot Temperature; D008297:Male; D011897:Random Allocation; D013974:Thyroxine / Q000097:blood*; D014284:Triiodothyronine / Q000097:blood*
chemical_list: D014284:Triiodothyronine; D013974:Thyroxine
keywords: broiler; extruded canola meal; heat stress; triiodothyronine