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

Autor: F. Fallah, Y. Ebrahimnezhad, N. Maheri-Sis, M. Ghasemi-Sadabadi
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Zdroj: Archives Animal Breeding, Vol 59, Iss 2, Pp 191-199 (2016)
Druh dokumentu: article
ISSN: 0003-9438
2363-9822
DOI: 10.5194/aab-59-191-2016
Popis: This study was conducted to determine the effect of different levels of diet total volatile nitrogen (TVN) on performance, carcass characteristics and meat TVN in broiler chickens. A total of 400 one-day-old Ross 308 broiler chicks was used in this study. On the first day, male and female chicks were separated by feather sexing. In the first week, all chicks were reared together and fed with a basal diet without urea. At the beginning of the second week, the male and female chicks were weighed so that the average body weight of chicks was approximately equal in each cage. Then the male and female chicks were allocated to 25 floor pens in a completely randomized design with five treatments, five replicates and 16 chicks in each replicate (eight males and eight females) throughout the experimental period, which lasted for 42 days. Dietary treatments consisted of zero (control), 0.5, 1, 1.5 and 2 % of urea in the diets. Before starting the experiment, the TVN levels in all diets were measured after adding different levels of urea, and TVN levels were 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 feed conversion ratio (FCR) were measured. Carcass characteristics as well as TVN in breast meat, thigh meat and the whole carcass and in left tibia and toe ash were measured. The results showed that FI levels were significantly different between the groups at different weeks except for the second week (P P P P −1 linearly reduced left tibia and toe ash (P P −1 reduces performance traits, carcass characteristics, and left tibia and toe ash and increases the TVN amount of breast meat, thigh meat and the whole carcass.
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