00000cab a22000004a 4500 IPP-00000656846 IPP 20230518135724.0 230518s2021 xx d | ||r |||||eng|| eng Hosseinian, Seyedeh Alemeh Evaluating different physiological parameters of aged Lohmann LSL-classic laying hens 2021 figures; tables; references Increasing the laying period in layer hen is reasonable when the birds remain at good health status and egg quality. This study aimed to assess blood biochemical parameters, egg quality, and histomorphological findings in aged hens. Sixty healthy clinically Lohmann LSL-Classic (white-egg layers; 112 week of age) were kept temporarily for 10 weeks. During the study trial, the eggs were assessed for quality traits. Blood samples were collected at the end of the study period, and circulating total protein, albumin, globulin, glucose, triglycerides, cholesterol, high, low, and very low-density lipoproteins, and total and direct bilirubin were measured. Furthermore, the activity level of lipase, alkaline phosphatase, Gamma-Glutamyl Transferase, creatinine kinase, and amylase enzymes were evaluated. Finally, appropriate samples from the ovary and oviduct were taken from 10 hens for histomorphological evaluation. In the studied hens, the values of various physiological parameters and the histomorphological traits were close to normal values in other previous studies on younger hens. In conclusion, increasing the laying period up to 112 weeks in Lohmann LSL-Classic hens had no adverse effects on the health and production performance of birds. Therefore, the increasing egg production cycles up to 112 week-old seems to be acceptable. Chickens Egg production Blood proteins Histomorphology Ahmadi, Nasrollah Ghahramani, Zahra The Philippine Journal of Veterinary Medicine Vol. 58, no. 2 (Jul. 2021 - Dec. 2021), 193-200 Article FI