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Effets du conditionnement thermique précoce et de la supplémentation alimentaire en lin (Linum usitatissimum) sur la qualité des lipides des viandes, l'adaptation physiologique et métabolique à la chaleur et la résistance à la coccidiose chez le poulet de chair élevé en climat chaud.

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dc.contributor.author BENGHARBI, Zineb
dc.date.accessioned 2018-11-04T14:57:52Z
dc.date.available 2018-11-04T14:57:52Z
dc.date.issued 2018-05-10
dc.identifier.uri http://hdl.handle.net/123456789/829
dc.description.abstract Panting is the first and the most visible behavioral mechanism of broilers’ heat stress through which they reduce heat load by evaporation. The aim of the study was to assess the welfare of broilers reared in high ambient temperatures. It was conducted to explore the effects of broilers’ thermal conditioning (TC), 5% linseed dietary supplementation (LS) and their interaction on body weight, mortality rate and some physiological variables during a simulated gradual heat wave stress hours. 400 one-day-old chicks (ISA Hubbard 15) were allotted to 4 treatments for 5 replicates of 20 chickens each as follows: The control non-treated (C), non-acclimated and fed linseed supplemented (CL), acclimated and fed standard diet (AC) and acclimated and fed linseed (ACL). To evaluate the long lasting effects of the treatments on B°C, it was recorded over the last 10 days. Birds, at local marketing age, were exposed to a simulated heat stress during which ambient temperatures were gradually (2°C/hour) increased from 30°C and maintained at 38°C for 6 hours. At each hour, respiratory rate, blood pH and rectal body temperature of 15 birds from each group were measured and recorded and, also (for the surviving birds), their correlation with final growth weight and survival rate at finish. Results show that an impaired body weight was noticed in non-treated broilers compared to the treated birds. Linseed supplementation augmented (P<0.01) the body weight 9.11% and TC 6.52% where their combination increased it 11.35%. TC and LS reduced (P<0.01) mortality in treated birds by 33.33%. Physiological improvements during the simulated heat stress hours in LS fed animals were noticed, such as decrease (P<0.001) in rectal body temperature at 38°C as well as the respiratory rate. Consequently, pH was improved (P<0.001) during all heat stress hours in treated animals compared to C. However, the association of both factors (linseed supplementation and early-age thermal conditioning) improves thermotolerance by increasing the safety fluctuation of B°C (42.20°C to 42.80°C) at 38°C compared to Control birds (45.20°C to 45.80°C). In conclusion, LS (with its bioactive-antioxidant compounds which decrease the oxidative stress) and TC improve both body weight, survival rate and animal’s heat stress resistance of broilers by reducing B°C and blood pH during heat wave stress and, therefore, adverse heat stress impacts on broilers can be partially alleviated dietarily. Key words: broilers, heat stress, linseed, mortality, performance. en_US
dc.language.iso fr en_US
dc.publisher Physiological variations during a gradual six-hour simulated heat stress in early-age acclimated broilers fed linseed supp lemented diet Z. BENGHARBI1, S. DAHMOUNI1*, A. MOUATS1, M. PETKOVA2 and M. HALBOUCHE1 1 Université de Mostaganem, Faculté des Sciences de la Nature et de Vie, Laboratoire de Physiologie Animale Appliquée, Mostaganem 27000, Algérie 2 Institute of Animal Science, Department of Animal Nutrition and Feed Technology, Kostinbrod 2232, Bulgaria en_US
dc.subject Poulet de chair - Acclimatation précoce – Thermorésistance – Linum usitatissimum – CoccidioseBroilers chicken – Early age acclimation – Thermoresistance - Linum usitatissimum - Coccidiosis.-.الكلمات المفتاحية: اللاحم التأقلم الحراري المبكر المقاومة للحرارة - - - Linum usitatissimum الكوكسيديوز -- en_US
dc.title Effets du conditionnement thermique précoce et de la supplémentation alimentaire en lin (Linum usitatissimum) sur la qualité des lipides des viandes, l'adaptation physiologique et métabolique à la chaleur et la résistance à la coccidiose chez le poulet de chair élevé en climat chaud. en_US
dc.type Thesis en_US


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