Browsing by Author "Yalçin, S."

Now showing 1 - 3 of 3

Effect of Breeder Age and Slaughter Weight on Meat Quality Traits of Broiler Breast and Leg Meats
(Verlag Eugen Ulmer, 2014) Yalçin, S.; Güler, H.C.; Yaşa, İ.; İzzetoğlu, G.T.; Özkan, S.
The objective of the present study was to evaluate the effect of breeder age (28-wk vs. 48-wk of age breeders) on meat quality traits of breast and leg meats of broilers slaughtered at 1800, 2100 and 2400 g weights. The pH24, colour, thawing and cooking loss, texture, initial protein solubility and myofibril dimensions were measured. Slaughter weight affected pH24, lightness, thawing and cooking loss and protein solubilities of broiler breast and leg meat.; Tenderness of leg meat decreased with slaughter weight. Breast meat from 48-wk breeders lost more water during thawing. A significant breeder age by slaughter weight interaction showed that the increases in initial myofibrillar protein solubility of breast meat and both initial myofibrillar and sarcoplasmic protein solubilities of leg meat with slaughter weight were higher in broilers from 28-wk breeders than those from 48-wk breeders There was negative correlation between breast meat pH24 and L*, b*, and thawing loss whereas leg meat pH24 was positively correlated with a*, negatively correlated with b*, texture, thawing and cooking loss. A negative correlation was found between cooking loss and myofibrillar protein solubilities of breast meat.; The results suggested that breeder age may affect thawing loss of breast meat and total initial protein solubility of both breast and leg meats. Higher myofibrillar protein solubility found for breast and leg meat of broilers from 28-wk breeders may indicate better functional qualities. © Verlag Eugen Ulmer, Stuttgart.
Evaluation of a Stress Model Induced by Dietary Corticosterone Supplementation in Broiler Breeders: Effects on Egg Yolk Corticosterone Concentration and Biochemical Blood Parameters
(2013) Babacanoǧlu, E.; Yalçin, S.; Uysal, S.
1. This study aimed to evaluate a stress model induced by corticosterone (CORT) supplementation in the diet of broiler breeder hens.2. A total of 60 Ross broiler breeder hens at 29 weeks of age were randomly divided into 4 groups with 15 hens each. The first group served as the control. The rest of the hens were given 1, 1.5 or 2 mg of CORT/hen/d (CORT1, CORT1.5 and CORT2, respectively) for 7 d. Concentrations of yolk CORT, plasma uric acid, glucose, cholesterol, creatine kinase, heterophil (H):lymphocyte (L) ratio and duration of tonic immobility (TI) were measured at d 3, 5 and 7 of CORT supplementation. The same measurements were repeated at 3, 5 and 7 d after CORT was withdrawn from the diet.3. There were no significant CORT dose effect on yolk CORT and plasma glucose concentrations. Higher plasma uric acid and H:L ratio was obtained for CORT1.5 and CORT2 than for CORT1. From 3 to 7 d of dietary CORT supplementation, yolk CORT and plasma uric acid concentrations and H:L ratio increased whereas plasma glucose concentration decreased. After CORT was withdrawn from the diet, the H:L ratio remained elevated. The duration of TI and plasma creatine kinase concentration did not change during and after CORT supplementation.4. Yolk CORT concentration was correlated with plasma uric acid concentration during CORT supplementation.5. The results suggest that dietary CORT supplementation could be used as a stress model and to evaluate hormone-mediated maternal effects in broiler breeder hens. © 2013 British Poultry Science Ltd.
Hormone-Mediated Maternal Stress Affects Embryonic Development During Incubation Without Adverse Effect on Chick Weight and Body Composition
(Taylor and Francis Ltd., 2014) Babacanoǧlu, E.; Yalçin, S.
1. The objective of this study was to evaluate the effect of maternal stress (MS) induced by supplementing the hen's diet with 2 mg/hen/d dietary corticosterone (CORT) on embryonic development, biochemical blood parameters and hatching performance of broiler chicks.2. A total of 200 Ross broiler breeder hens at 42 weeks of age were randomly divided into two groups: MS or control. Hens in the MS were fed 2 mg/hen/d CORT for 14 d. Eggs (648 and 635 eggs for MS and control, respectively) were collected from d 3 to 14 of dietary CORT supplementation and incubated. Weights of embryo, chicks and organs and body composition were determined during incubation and at hatch. Biochemical blood parameters were measured at internal pipping stage and day of hatch. Hatching performance and embryonic mortalities were recorded.3. Hens fed a diet supplemented with CORT had lighter body weight and produced less eggs at the end of the 14-d treatment period. Although MS embryos were heavier than control from 12 to 18 d of incubation, chick weight was similar at the day of hatch. Lower relative weights for yolk sac and bursa were observed at 12 d of incubation for MS chicks compared to control. Chicks from both groups had similar body content in spite of higher fat content of MS embryos on d 18 of incubation.4. MS had no effect on the duration of incubation or hatching performance but increased mortality at the pipping stage.5. The results suggest that hormone-mediated MS might affect embryonic development during incubation without adverse effect on chick weight and body composition. © 2014 British Poultry Science Ltd.