Investigation of nutrition management status of industrial dairy farms in varamin and Pishva, Tehran, Iran

This research was performed to investigate status of nutrition management of industrial dairy farms in Varamin and Pishva. List, statistics and location information on industrial dairy farms were first obtained from data present at livestock affair effect of agricultural Jihad of the foresaid cities. From 27 to 100 percent of active farms, a total of 43 dairy units was selected. The selected farms were classified into six groups in terms of productive cow capacity: (10-50), (51-150), (151-300), (301-450), (451600) and (601-1800). Totally 12986 dairy cows were assessed since shahrivar of 1390 until Esfand of 1391 using questionnaire either verbally or direct data collection. In order to facilitate investigation cows were classified into high-productive, midproductive, low productive and dry cows.Mean food consumption based on dry matter consumed (kg), lactating net energy (mega calorie), crude protein, Ca and P (g) for high-productive, mid-productive, low- productive and dry cows were equaled to (3/686, -1/919, 0/251, -1/919), (27/408, 29/114, 27/038), (0/686, -1/485, -1/357, 1/109), (0/089, 0/090, 0/094, 0/089) and (0/081, 0/0093, 0/0137, 0/073) respectively, Mean dry matter consumption for high productive and dry cows was different at probability levels of 0/05 and lactating net energy for all groups was different at p