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    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.
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    Effects of long-term heat stress and dietary restriction on the expression of genes of steroidogenic pathway and small heat-shock proteins in rat testicular tissue
    (Wiley, 2017) Bozkaya, F.; Atli, M. O.; Guzeloglu, A.; Kayis, S. A.; Yildirim, M. E.; Kurar, E.; Yilmaz, R.
    The aim was to investigate the effects of long-term heat stress and dietary restriction on the expression of certain genes involving in steroidogenic pathway and small heat-shock proteins (sHSPs) in rat testis. Sprague Dawley rats (n = 24) were equally divided into four groups. Group I and II were kept at an ambient temperature of 22 degrees C, while Groups III and IV were reared at 38 degrees C for 9 weeks. Feed was freely available for Group I and Group III, while Group II and Group IV were fed 60% of the diet consumed by their ad libitum counterparts. At the end of 9 weeks, testicles were collected under euthanasia. Total RNA was isolated from testis tissue samples. Expression profiles of the genes encoding androgen-binding protein, follicle-stimulating hormone receptor, androgen receptor, luteinising hormone receptor, steroidogenic acute regulatory protein (StAR), cyclooxygenase-2 and sHSP genes were assessed at mRNA levels using qPCR. Long-term heat stress decreased the expression of StAR and HspB10 genes while dietary restriction upregulated StAR gene expression. The results suggested that long-term heat stress negatively affected the expression of StAR and HspB10 genes and the dietary restriction was able to reverse negative effect of heat stress on the expression of StAR gene in rat testis.