Patrick G. Mwangi1*, Charles K. Gachuiri2, Paul N. Mbugua2, Tura Isako1.
1Kenya Agricultural and Livestock Organization (KALRO), Kaptagat Rd, Nairobi, Kenya
2Department of Animal Production, Faculty of Veterinary Medicine, College of Agriculture and Veterinary Sciences, University of Nairobi, P.O Box 29053-00625, Kangemi, Nairobi.

American Journal of Agricultural Research

Improved Dual Purpose Sorghum (IDPS) (Sorghum bicolor -Var Ikinyaruka) was harvested at six physiological growth stages and ensiled to evaluate the effect of growth stage on silage quality. The 6 treatments based on physiological growth stage of the sorghum were: bloom stage (PS1), soft dough stage (PS2), hard dough stage (PS3), physiological maturity stage (stalks with grains), (PS4), physiological maturity stage (stalks without grains) (PS5), and 1 month post grain harvest (PS6). The material was ensiled for 30 days in mini-silos made from 1000g plastic bags. The parameters monitored were silage Dry Matter (DM), Crude Protein (CP), Neutral Detergent fiber (NDF), Acid Detergent Fiber (ADF), Acid Detergent Lignin (ADL), In-vitro Dry Matter Digestibility (IVDMD), pH and ammonia–N. The highest silage DM (30.60) was achieved at PS4 compared with 22.00, 26.00, 29.60, 29.50 and 27.10 for PS1, PS2, PS3, PS5 and PS6, respectively. The CP content decreased with maturity from 7.72 at PS1 to 7.01, 7.00, 7.00, 6.71 to 6.68 at PS2, PS3, PS4, PS5 and PS6 respectively. NDF and ADF at PS1, PS2, PS3, PS4, PS5 and PS6 were 56.50, 62.80, 65.97, 66.24, 67.27, 70.76 and 29.46, 36.49, 41.82, 41.95, 42.76 and 46.37 respectively. ADL was 3.54, 5.50, 7.35, 7.47, 7.52, and 8.50 for PS1, PS2, PS3, PS4, PS5 and PS6 respectively. Highest silage IVDMD of 56.06 was at PS1 secernated with 53.70, 52.47, 52.32, 52.21 and 42.52 achieved at PS2, PS3, PS4, PS5 and PS6 respectively. Silage from hard dough stage (PS3) yielded silage with highest nutritive value.

Keywords: Dual purpose, silage, growth stage, sorghum

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Pat r ick G. Mwang i, Char les K. Gachuiri, Paul N. Mbugua, Tura Isako. EFFECT OF GROWTH STAGE OF DUAL PURPOSE SORGHUM ON SILAGE QUALITY. American Journal of Agricultural Research, 2019,4:42.


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