The effects of different dietary energy and protein levels on production and composition of milk in West Azerbaijan dairy buffalos.
2008
Amini, Jahan Gir | Razzaq Zadeh, Sarain | Mohsen Pur Azari, A`li | Hesami Rad, Rajab | Gholami, Hossein | Afshar Hamidi, Bahram
In order to determination the effects of different energy and protein levels on West Azerbaijan dairy buffaloes performance, six diets with 3 different metabolizable energy levels: equal, 10% below and 10% higher than NRC (1996) and two levels of protein: equal and 10% below NRC (1996) were fed to 6 dairy buffaloes for 5 months in a change over design with 25 days changing periods. The experimental treatments were: diets with low energy, high protein (LH), Medium energy high protein (MH), high energy high protein (HH), low energy low protein (LL), Medium energy low protein (ML), high energy low protein (HL). The results showed that dry matter intakes (DMI) were significantly different between the treatments (P0.05). Treatment 1 (LH) and treatment 3 (HH) had lower and higher DMI respectively. But DMI per kg BW, DMI per kg BW0.75 and DMI per 100kg BW were not significantly different between the treatments. Differences of initial and final body weights of buffaloes between treatments were not significant. There were significant difference in daily milk production, 6% fat corrected milk (FCM) and milk fat percent between the treatments (P0.05). The lowest and highest daily milk production and 6% FCM belong to LL and HH respectively. But the highest and lowest milk fat percent belong to the treatment LL and HH respectively and the differences were significant. The differences of milk dry mater, lactose, protein, ash, Ca and SNF were not significant. Feed conversion ratios (FCR) for milk production and (FCM)6% were significantly different between the treatments (P0.05). The lowest FCR for daily milk production and (FCM) 6% belong to HH and MH respectively and the highest of both traits belong to LL. In overall, due to lowest corrected fat, FCR and low body weight changes, treatment 2 (medium energy ,high protein ) had better performance.
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