Yazar "Simsek, U. G." seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim Yok
    Öğe
    A slow-growth model for fast-growing broilers: effects on breast meat quality and myopathy incidence
    (Taylor & Francis Ltd, 2026) Gungoren, G.; Simsek, U. G.; Gungoren, A.; Yilmaz, R.; Otlu, O.
    1. This study evaluated the effects of a biologically calibrated pair-feeding model on breast meat yield, quality traits, biochemical markers and pectoral myopathy (PM) incidence in different broiler genotypes. 2. Fast-growing Ross 308 and Cobb 500 breeds were pair-fed according to the voluntary intake of a slow-growing strain (Hubbard Red JA) to moderate growth trajectory. A total of 300 broilers were allocated to ad libitum or pair-fed groups. Birds were slaughtered at comparable target live weights. Breast muscle yield, proximate composition, pH, colour (L*, a*, b*), water-holding capacity (WHC), cooking loss (CL), serum creatine kinase (CK), lactate dehydrogenase (LDH), calcium (Ca2+), malondialdehyde (MDA) and histopathological lesion scores were evaluated. 3. Pair-feeding significantly reduced breast muscle weight in Ross 308 and Cobb 500 (p < 0.001). In Ross birds, pair-feeding lowered CK (p < 0.001), LDH (p < 0.001) and Ca2+ (p = 0.046) concentrations and significantly reduced myodegeneration, fibrosis, infiltration and total myopathy scores (p < 0.001). Cobb birds had reduced CK (p = 0.014) and LDH (p < 0.001) but showed limited histopathological improvement (p > 0.05). 4. Pair-feeding increased lightness (L*) and decreased redness (a*) values at early post-mortem measurements (p < 0.001), while effects on ultimate pH (p = 0.003 in Ross) and WHC (p < 0.001 in Ross) were modest and genotype-dependent. Cooking losses were significantly decreased in both Ross (p < 0.001) and Hubbard strains (p < 0.001). 5. These findings suggested that pair-feeding based on slow-growing intake patterns can partially mitigate PM incidence and improve selected meat quality traits in fast-growing broilers, particularly Ross 308. However, genotype-specific responses indicated that growth-moderating strategies should be tailored to genetic background.
  • Küçük Resim Yok
    Öğe
    Comparative Effects of in Ovo and Post-Hatch Taurine Administration on White Striping Myopathy in Broiler Chickens
    (Facta - Fundacao Apoio Ciencia & Tecnologia Animal, 2026) Baykalir, Y.; Simsek, U. G.; Seker, I; Koseman, A.; Gul, B.; Timurkaan, N.; Beyazgul, P.
    This study evaluated the effects of taurine supplementation administered in ovo and via drinking water on growth performance, carcass traits, oxidative stress status, and white striping (WS) incidence in broiler chickens. A total of 720 fertilized eggs were randomly allocated to three groups: Control (no treatment), Sham (sterile distilled water injection), and in ovo taurine (IOT; 1.30 mg/egg). After hatching, chicks were assigned to four experimental groups: Control, Sham, IOT, and taurine via drinking water (DWT), administered daily as a freshly prepared stock solution (250mg/10mL). Growth performance was monitored over 42 days. The IOT group exhibited reduced feed intake and body weight gain during the later growth stages. Carcass analysis revealed significantly lower breast and thigh weights in the IOT group (p<0.001), whereas liver weight was highest in the DWT group. No significant differences in WS scores or breast pH were observed among treatments (p>0.05). Histological evaluation showed that IOT significantly reduced the severity of lipidosis, particularly toward the end of the experimental period (p<0.001). Regarding oxidative stress, malondialdehyde (MDA) levels were elevated in the Control and DWT groups, while reduced glutathione (GSH) and superoxide dismutase (SOD) activities were significantly higher in the IOT and Sham groups (p<0.001). The lowest expression of heat shock protein 70 (HSP70) and the highest levels of fibronectin type III domain-containing protein 5 (FNDC5/irisin) were observed in the IOT group (p<0.001). Although in ovo taurine supplementation did not improve growth performance or carcass yield, it enhanced antioxidant capacity and muscle metabolism.