Effect of dry matter adjustment and/or additives on fermentation process and nutritive value of sweet corn husk and cob silage
1999
Stang Pumisutapool(Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture. Department of Animal Science) | Somkid Promma(Department of Livestock Development, Bangkok (Thailand). Animal Husbandry Division. Chiang Mai Livestock Research and Breeding Center) | Boonserm Cheva-Isarakul(Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture. Department of Animal Science) | Boonlom Cheva-Isarakul(Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture. Department of Animal Science)
Exp I: Study the method of dry matter (DM) adjustment and/of additives for producing good quality silage from sweet corn husk and cob. Thirty treatment combinations each with 6 replicates, composed of 6 methods and 5 groups of additives. The 6 methods were (1) no adjustment (2, 3 and 4) adjusted with 16 percent of rice straw or soy bean straw or ground cassava chip, while (5 and 6) were adjusted by pressed through small hydraulic equipment without or with 3 percent cassava. The additives (per kg of fresh matter) were A) no additives, B) 2.8 g formic acid, C) 6.7 g formalin, D) 10 g of formic acid plus formalin (1:3) and E) 10 g urea. The ensiling was done in plastic bag, each contained 12 kg fresh material. Methods of dry matter adjustment had no effect on ammonia content and dry matter loss. The supplement with formalin or formic acid plus formalin effectively reduced dry matter loss and NH3-N. The pH value was lowest in the formic group (3.98) owing to its acid nature but highest in formalin group (4.78) due to its microbial inhibition property. Exp II : Study the supplement effect of cassava (C) compared to rice bran (RB) at 16 percent of fresh matter without or with 4.38 g formalin (F) per kg fresh material. The ensiling was done in double layers plastic bags, with 7 replicates, each contained 20 kg fresh material. The ensiling with RB caused higher pH (4.45 vs 4.28), lactic acid (5.72 vs 3.74 percent DM), crude protein (11.21 vs 6.30 percent) and lower NH3-N (6.15 vs 10.74 percent of total-N) than C. The supplement with F caused higher pH (4.76 vs 3.97) but lower NH3-N (5.53 vs 11.36 percent of total-N) and total acids (2.82 vs 9.85 percent DM). Dry matter consumption by sheep of the formalin groups was higher than the unsupplemneted groups (48.64 vs 38.78 g/kgBW(sup)0.75).
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