Asuncion, Ralph Kevin A. <br/><br/>
Production Performance Fertility and Hatchability of Mallard Duck at Different Ages as Influenced By Mating Ratio  [manuscript] / 
Ralph Kevin A. Asuncion, Ma. Jessica C. Balagtas, Aylyn B. Delos Reyes, Jennifer R. Estabillo & Jim Bryan P. Salvador. 
 - Magalang, Pampanga :  Pampanga State Agricultural University,  2019. 
 - xvi; 60 leaves + CD ;  28 cm.