Nutritive value of wheat straw spent Compost of Agaricus bisporus mushroom as ruminant feed
2007
Talebiyan Mas`oudi, A`li Reza | Faza`li, Hasan | Borji, Mohsen
Spent compost wheat straw is an available by – product, remained from edible mushroom production, which is constitutes a potential pollutant and cost effective for disposal. This experiment was conducted to determine the nutritive value of spent wheat straw compost from Agaricus bisporus mushroom as ruminant feed. Spent compost was provided from a mushroom farm and the casing soil was removed from the whole compost. The spent straw was sun dried and sampled for chemical analysis. A pre test was carried out to determine the possibility free choice intake of the straw, using of 8 mature male sheep for 7 days. Then the main trial was conducted, in which four wheat straw based diets includingcontrol (I), 10% spent straw (II), 20% spent straw (III) and 30% spent straw (IV) were tested in sheep. The diets were formulated to provide the maintenance requirements and fed to 8 sheep for 56 days experiment in a Latin square based design (change over) in 4 periods of time. Dry matter intake (DMI), organic matter intake (OMI), Digestible dry matter intake (DDMI) digestible organic matter intake (DOMI), digestibility of dry matter (DMD), organic matter (OMD), crude protein (CPD), crude fiber (CFD), acid detergent fiber (ADFD), neutral detergent fiber (NDFD) and nitrogen balance were determined. Data obtained from the pre-test indicated that the spent wheat straw could not be accepted by sheep as a sole feed. The DMI were 74.0, 73.8, 70.2 and 57.1OMI 62.7, 63.4, 58.0 and 44.4 g per kg of WB 0.75 for the diets I, II, III and IV respectively which were significantly (P0.05) lower in the diet IV. The DDMI and DOMI were 36.2, 34.5, 32.6, 22.7 and 33.1, 32.6, 30.6, 20.2 g per kg of WB 0.75 in the four diets respectively. The diet IV resulted in a significantly (P0.05) lower DDMI and DOMI than the other diets. DMD, OMD, CPD, CFD, ADFD and NDFD in the diets I, II, III and IV were 48.8, 46.8, 46.5, 41.252.8, 51.3, 52.7, 45.5, 49.6, 46.8, 38.1, 28.149.7, 48.9, 49.7, 46.2, 41.8, 41.7, 40.6, 34.6 and 46.7, 47.5, 47.0, 42.9 respectively which were statistically (P0.05) various among the diets. Inclusion of spent compost straw up to 20% of the diet did not affected the digestibility of DM, OM, CF, ADF and NDF, however diet contained 30% spent compost straw showed a significantly (P0.05) lower nutrient digestibility. Additionally, the CPD was statistically (P0.05) decreased in the diets III and IV and the lowest amount was observed in the diet IV. The nitrogen balance were 1.34, 1.37, 1.31 and -0.57 for the diets I to IV respectively which was significantly (P0.05) different among the treatments. It can be concluded that spent compost wheat straw may be used as a ruminant feed. In this experiment, inclusion of spent compost straw up to a 20% of the diet could be equal to the 16.5% of wheat straw, 3.3% of cotton seed meal and 0.3% of urea.
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