1. a Animal Science Department, Faculty of Agriculture , University Putra Malaysia , 43400 , UPM Serdang , Selangor , Malaysia
2. b Department of Soil, Plant, Environment and Animal Production Sciences, Faculty of Agriculture , University of Naples Federico II , 80055 , Portici (Na) , Italy
3. c CNR-ISPAAM: National Research Council (CNR) of Italy, Institute of Animal Production Systems in Mediterranean Environments (ISPAAM), Laboratory of Animal Cytogenetics and Gene Mapping , Via Argine 1085, 80147 , Naples , Italy