Forage yields and quality of Cenchrus ciliaris and Panicum maximum ecotypes under varied harvest intervals in a semi-arid environment in Kenya
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Abstract
Abstract. Kisambo BK, Wasonga OV, Kipchirchir OK, Karuku GN, Kirwa EC. 2023. Forage yields and quality of Cenchrus ciliaris and Panicum maximum ecotypes under varied harvest intervals in a semi-arid environment in Kenya. Intl J Trop Drylands 7: 102-111. Livestock production in Kenya typically relies on native pastures for nutrition and efforts are ongoing to develop varieties adapted to semi-arid conditions. A field experiment was conducted in a semi-arid environment to evaluate harvest intervals’ influence on the yield and nutritional attributes of selected grass ecotypes of two native grasses used in reseeding and fodder production. The grasses included buffel grass Cenchrus ciliaris Kilifi (KLF), C. ciliaris Magadi (MGD), Guinea grass Panicum maximum Isinya (ISY) and P. maximum Taveta (TVT). They were planted in a randomized-complete block design in a split-plot arrangement and maintained under rain-fed conditions. Forage harvests were performed at 3 harvest intervals i.e., 14, 28 and 84 days, simulating different utilization regimes in semi-arid Kenya. Biomass yield, forage accumulation and quality of the grasses were determined. The highest yields were obtained at 28-day harvest intervals and were 74% higher than the 14-day interval, although almost similar to the 84-day interval harvests. Forage accumulation rates varied significantly (p <0.005) between ecotypes and harvesting intervals. Crude Protein (CP) declined significantly with maturity, from a mean of 11.67% for the 14-day harvesting interval to 5.22% at the end of the season and varied among treatments. In Vitro Dry Matter Digestibility (IVDMD) increased with increasing harvest interval. However, fiber components-Nutrient Detergent Fiber (NDF), Acid Detergent Fiber (ADF) and Acid Detergent Lignin (ADL) increased with plant age. Harvest intervals had a significant (p <0.05) influence on the yield and qualitative attributes of the grass ecotypes. C. ciliaris ecotype MGD and P. maximum ecotype TVT are viable options for further performance evaluation in semi-arid environments as efforts to develop new range fodder varieties are accelerated.
2017-01-01