@article{
author = "Dosković, Vladimir and Bogosavljević-Bošković, Snežana and Škrbić, Zdenka and Lukić, Miloš and Milošević, Božidar and Rakonjac, Simeon and Petričević, Veselin and Bjedov, Siniša",
year = "2023-12",
abstract = "This study aimed to assess the effects of different dietary levels of the protease enzyme
and sex on skin, bone and muscle yields and percentages of breast, drumsticks and thighs
as the most valuable carcass parts of broilers. A total of 300 one-day-old, mixed-sex
broiler chickens (Cobb 500) were randomly divided into 3 dietary treatments with
different levels of protease supplementation (group C: a standard diet without Ronozyme
ProAct; group E-I: a diet with 200 mg/kg Ronozyme ProAct and a 4% crude protein
reduction compared to the standard diet; and group E-II: a diet with 300mg/kg Ronozyme
ProAct and a 6% crude protein reduction compared to the standard diet). All diets were
maize- and soybean meal-based. Feed and water were provided ad libitum throughout the
49-day feeding trial. The results obtained indicate that the dietary treatments had no
significant effect on skin, bone and muscle yields and percentages of the drumsticks,
thighs and breast (P > 0.05), except for the breast muscle weight in the female chickens
(especially between the E-I and E-II groups), and the drumstick bone percentage in the
males between the C and E-2 groups (P < 0.05). In all three groups, the male chickens
exhibited higher weights of skin, muscle and bone in breast, drumsticks and thighs than
the female chickens, and the differences were not significant only in the skin weight of
drumsticks and thighs (P > 0.05). The females had a higher yield of muscle tissue in
breast and drumsticks, a higher percentage of skin in drumsticks and thighs, and a lower
percentage of bone in drumsticks and thighs than the males (P < 0.05). Major differences
resulted from the effect of broiler sex, whereas the dietary treatments containing 3 levels
of protease supplementation had a very small effect on the yields and percentages of skin,
bone and muscle in breast, drumsticks and thighs.",
publisher = "University of Novi Sad, Faculty of Agriculture, Novi Sad, Serbia",
journal = "Contemporary Agriculture",
title = "Effects of protease and sex on skin, bone and muscle yields and percentages of major primal cuts in broilers",
volume = "72",
number = "4",
pages = "165-169",
doi = "10.2478/contagri-2023-0021"
}
