Effect of Substitution of Urea with Different Type and Levels of Ruminant Manure on Nutritive Value of Rice Straw Silage

الملخص EN

This study was conducted in Nutrition Lab.

to investigate the effect of the type and level of substitution of urea with ruminant manure, M (sheep, cow and buffalo) on basis of nitrogen (N) content on the nutritive value of rice straw silage (RSS).

Accordingly silages were nominated as, S-RSS, C-RSS and B-RSS.

Urea (U) was substituted with dried manure at 6 combinations, 100: 0, 90: 10, 80: 20, 70: 30, 60: 40 and 50: 50 of U: M.

Silage samples were prepared by treating chopped straw with pre-treated solution contained 10% low quality debis and 2% urea.

Results showed that lower (P˂0.01) DM loss (11.4% ) was observed in S-RSS, and with addition of urea only (3.6% ).

Samples of S-RSS and C-RSS recorded higher (P˂0.01) Fleig points (Fp) as compared with those prepared by the addition of B-RSS, 60.42, 55.58 and 49.59 respectively.

Reduction (P˂0.01) in this parameter was noticed in samples prepared with a combination of 100: 0.

Aerobic stability (AS) was a reduced (P˂0.01) in samples prepared by addition of S-RSS by 15 and 13 hours in comparison with samples of C-RSS and B-RSS respectively.

Samples prepared with combination of 100: 0 were prior (P˂0.01) as compared with other samples.

Results also showed an increase (P˂0.01) in in vitro digestibility of organic matter (IVOMD) in samples of S-RSS in comparison with samples prepared by addition of C-RSS and B-RSS, 49.99, 44.59 and 42.77% respectively.

Samples prepared with combination of 100: 0 recorded lower (P˂0.05) in vitro digestibility of dry matter (IVDMD) as compared with combinations of 70: 30 and 60: 40 of U: M, 40.52, 45.36 and 45.94% respectively.