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This study wasconducted to determine the effect of different levels of diet total volatilenitrogen (TVN) on performance, carcass characteristics and meat TVN inbroiler chickens. A total of 400 one-day-old Ross 308 broiler chicks was usedin this study. On the first day, male and female chicks were separated byfeather sexing. In the first week, all chicks were reared together and fedwith a basal diet without urea. At the beginning of the second week, the maleand female chicks were weighed so that the average body weight of chicks wasapproximately equal in each cage. Then the male and female chicks wereallocated to 25 floor pens in a completely randomized design with fivetreatments, five replicates and 16 chicks in each replicate (eight males andeight females) throughout the experimental period, which lasted for 42 days.Dietary treatments consisted of zero (control), 0.5, 1, 1.5 and 2 % ofurea in the diets. Before starting the experiment, the TVN levels in alldiets were measured after adding different levels of urea, and TVN levelswere 13.30, 14.95, 17.26, 23.26 and 27.47 mg 100 g−1 and 16.66,15.02, 17.81, 24.66 and 26.25 mg 100 g−1 in starter and grower diets,respectively. Feed intake (FI), body weight gain (BWG) and the feedconversion ratio (FCR) were measured. Carcass characteristics as well as TVNin breast meat, thigh meat and the whole carcass and in left tibia and toeash were measured. The results showed that FI levels were significantlydifferent between the groups at different weeks except for the second week(P < 0.05). The BWG significantly differed among treatments(P < 0.05). In the second and sixth weeks, FCR was affected byincreasing TVN in the diet (P < 0.05). Increasing TVN in broilerdiets had a significant effect on the carcass characteristics(P < 0.05). Increasing TVN to more than 15 mg 100 g−1linearly reduced left tibia and toe ash (P < 0.05). In addition,increasing TVN in the broiler diets affected the TVN of breast meat, thighmeat and the whole carcass of broilers (P < 0.05). These resultssuggest that increasing diet TVN to more than 15 mg 100 g−1 reducesperformance traits, carcass characteristics, and left tibia and toe ash andincreases the TVN amount of breast meat, thigh meat and the whole carcass

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The effect of different levels of diet total volatile nitrogen on performance, carcass characteristics and meat total volatile nitrogen in broiler chickens