Volume 23 (5):458-465, 2019
Effect of urea molasses lick and azolla supplements on feed intake and milk production in Holstein cows.
Department of Animal Science, Faculty of Agriculture, University of Tehran, Tehran, Iran.
Akbarizonoz A., Effect of urea molasses lick and azolla supplements on feed intake and milk production in Holstein cows, Onl J Vet Res., 23 (5):458-465, 2019. Two groups of 5 lactating Holstein dairy cows each were supplemented 90 days during winter with ~300g/head/day urea molasses-mineral-brick with crude protein (CP) 31.7% or 1.5kg Azolla with CP of 21.4% both with standard diet of wheat straw ad libitum with CP 18.7% and concentrate mixture with CP of 4.4%. Five control cows were fed only standard diet. In cows given urea-molasses, dry matter intake (12.40/kg/cow/day) was ~5-9% and total digestible nutrient intake ~5-7% higher (P < 0.05) compared with controls or with those given Azolla. Similar results were found with crude protein. Daily milk production (litre/cow) was also ~5% higher (P<0.05) (7.54L/day) in cows supplemented urea-molasses compared to controls (7.27L/day) or given Azolla (7.13L/day). Cows given urea molasses spent about 8% (P < 0.05) more time resting over 24h feeding periods compared with controls. We find that urea-molasses supplement improved digestibility and milk production in Holstein cows probably due to increased palatability of poor quality roughage during winter.
Key Words: Nutrients, Feed Supplements, Milk production, Holstein Cows.