ISBN: 9787802333536 - 蛋鸡生产实用技术 农业部农民科技教育培训中心,中央农业广播 (1 Ergebnisse)

paperback. Zustand: New. Paperback. Pages Number: 54 Language: Chinese . Publisher: China Agricultural Science and Technology Press Pub. Date :2008-01-01. Layers practical technology mainly includes the entire process of laying hens Brood (O ~ 42 days). incubation period (43 to 140 days ). egg production period (141-500 days) of feeding and management. layer farms comprehensive health and major disease control and prevention measures to improve the economic efficiency of measures laying field. Book table with a perfo.…