Chemical Composition, Dry Matter and Crud Protein Degradability Coefficients of Alfalfa Silage Treated whit HCL and Urea and Their Effects on Production in Early Lactating Holstein Cows
Message:
Abstract:
The effect of chloridric acid and urea on chemical composition, dry matter (DM) and crud protein (CP) degradability coefficients of alfalfa silage and its effect on early lactating Holstein cows performance were evaluated in the one experiment with 3 trials. In the first trial, fresh alfalfa was chopped, mixed with different level of Hcl (0.0, 2, 4, 6, 8, 10, 12, 14 and 16 ml/kg DM) and urea (0.0, 2.5, 5, 7.5, 10 g/kg DM) and ensiled in the laboratory silos. Crude protein content and pH of treated silages were not affected by the acid or urea application. In the second trial, ruminal degradability coefficients of crude protein and dry matter of some of silage were determined using nylon bag technique. The selected silages were alfalfa silage without acid and urea (T1), 4 ml/kg DM acid + 5 g/kg DM urea (T2). 5g/kg DMurea + 12 ml/kg DM acid (T3). Ruminal degradability coefficients of DM and CP influenced by the acid and urea treatment. In third trial, 15 early lactating cows (21 ± 3 dys in milk) were fed with diet containing T1, T2 or T3 (experiment 2) that were substituted by 75% alfalfa hay in completely randomized design for seven weeks. Dry matter intake and milk yield were recorded daily. Milk samples were collected at the end of the first, 3th, 4th, 5th and 7th weeks of the experimental period. Blood samples were taken two times (on week 3 and week 7) at 0.0, 2 and 4 hours after morning feeding. The data were analyzed as repeated measures in time. Dry matter intake in cows fed T3 was significantly lower than cows fed other treatments (P< 0.05). Milk yield and milk fat were affected by the time (P<0.05). Blood glucose (mg /dl) at 0.0 (T1: 71 vs. T2: 73.7 and two hours after feeding (T1: 70.1 vs. T2: 73.6) were significantly (p< 0.05) affected by the treatment. As whole the results showed that the chloridric acid as a inorganic acid and cheep in treating of alfalfa silage due to useful effects on chemical parameters and dry matter and protein degradability characteristics can be used.
Language:
Persian
Published:
Journal of Animal Science Research, Volume:19 Issue: 2, 2010
Page:
1
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