The effect of prolonged fasting and refeeding on GSH-Px activity, plasma glucose and cholesterol levels and welfare of older hens from different genotypes
Makaleler > Tam Makale · 2005
Yazarlar: Özge. Altan, i. Oguz, Zübeyde Erbayraktar, O. Yilmaz, H. Bayraktar, Banu Sis
European Poultry Science, Uluslararası, Wos, 2005, cilt 69, ss 185-191
DOI: 10.1016/s0003-9098(25)00589-2
Özet
An experiment was conducted to evaluate the effects of 10-d fasting treatment on GSH-Px activity, blood cholesterol, blood glucose level, liver pathology and welfare status determined by tonic immobility response, heterophil/lymphocyte ratio, and feather score of aged hens from different genotypes. Hens from 3 genotypes, white layer (Bovans), brown layer (Isa Brawn) and broiler breeder (Ross-508), at 70 wk of age, were fed ad libitum for 4 wk (pre-fasting period) then feed was withdrawn for 10 d (fasting period). Following fasting period, all birds consumed feed ad libitum for the remainder of the study (post fasting period) Fasting treatment caused significant decrease in plasma glucose level and rectal temperature, but lead to significant increase in plasma cholesterol level and GSH-Px activity. All genotypes responded similarly to fasting treatment. Feather score, tonic immobility reaction and heterophil/lymphocyte ratio imply that a 10-d fasting reduced welfare of hens. However, it appeared that hens were able to cope with fasting-stress when data were evaluated after 4 wk refeeding period. Glucose level decreased, cholesterol level and GSH-Px activity increased after 4 week refeeding period compared to prefasting period. In conclusion, it seems possible that fasting can be used to decrease oxidative stress-mediated injury in aged hens without affecting welfare of hens from previous fasting experiment.