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- Title
Broiler tolerance to heat stress at various dietary protein/energy levels.
- Authors
Attia, Youssef A.; Hassan, Saber S.
- Abstract
A total of 140, 28-day-old male Ross-308 broiler chickens were used in a straight-run experimental design. The broilers were distributed among 4 treatment groups. One treatment group was raised under a thermoneutral condition (28 ± 4°C and 40 -60% RH) and fed on a basal diet containing 19% CP and 13.18 MJ ME/kg diet during days 28-49 (thermoneutral group). The other three groups (2, 3 and 4) were raised for 4 successive days per week under 36 ± 3°C and 40-60% RH for 6 h per day from 10 a.m. to 4 p.m. Group 2 was kept under chronic heat stress and fed on the basal diet and was considered a negative control. Group 3 was kept under chronic heat stress and fed feed having 22% CP and 13.18 MJ/ME kg, while group 4 was kept under chronic heat stress and fed on a diet containing 22% CP and 13.81 MJ ME/kg. Exposure to chronic heat stress decreased BWG and increased meat lipids, the liver leakage marker AST, cholesterol, glucose, cortisone and alkaline phosphatase, cloacal temperature, respiration rate, PCV, bursa percent, catalase, TAC and IgA, IgM and IgG compared to the thermoneutral group, but showed decreased SOD. on the other hand, increasing the protein concentration alone or in combination with increasing the energy concentration by increasing oil supplementation from 4.5% to 7.5% relieved the negative effects of chronic heat stress in broiler performance, meat lipids and physiological and immunological traits. Increasing the protein with energy concentration was the most effective method. Thus, it can be concluded that increasing protein with energy concentration may be a useful tool in improving the productive performance, meat quality, blood haematological and biochemical traits, antioxidants and immunity of broiler chickens.
- Subjects
BROILER chickens; EFFECT of heat on poultry; LOW-protein diet
- Publication
European Poultry Science / Archiv für Geflügelkunde, 2017, Vol 81, Issue 171, p1
- ISSN
0003-9098
- Publication type
Article
- DOI
10.1399/eps.2017.171