University of Khartoum

Effect of Age at Harvesting on the Nutritive Value of six Irrigated Tropical Grasses

Effect of Age at Harvesting on the Nutritive Value of six Irrigated Tropical Grasses

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Title: Effect of Age at Harvesting on the Nutritive Value of six Irrigated Tropical Grasses
Author: Msaad, Ragda Mahmoud Awad
Abstract: A complete randomized block design experiment with factorial arrangement (6x3) was conducted to investigate the effect of age at harvesting (30,45 and 60 days) on the nutritive value of six irrigated tropical grasses (sorghum bicolor , sorghum sudannse, sorghum bicolor x sorghum sudannse (pioneer), Zea mays, Chlories gayana and Eragrostis tef ). The grasses were obtained from the department of agronomy, Faculty of Agriculture, University of Khartoum, and were subjected to the same agronomical treatment. Proximate composition, cell-wall components, gas production and metabolizable (ME) were used as indices. The result revealed that, dry matter content was increased by 40% with increasing harvesting age from 30 days to 60 days. Neutral detergent fiber (NDF) and acid detergent fiber (ADF) contents were increased by increasing the harvesting age. Crud protein (CP) content was relatively high for all grasses at the three harvesting age ;the highest value was 16.6% at harvesting age of 30 days, while the lowest value was 10.5% at harvesting age of 60 days. The increment of ADF and NDF in concomitant with the reduction of Cp resulted in a reduction in total of gas produced and ME and the highest reduction was recorded for harvesting age of 60 days compared with 45 days. The last recorded of total gas and ME, due to increasing the at harvesting, was recorded for Chlories gayana and Eragrostis tef, while the highest reduction was recorded for sorghum bicolor and sorghum bicolor x sorghum sudannse. the study concluded that dry matter contain, acid detergent fiber and neutral detergent fiber were increased, while crude protein, total gas and metabolizable energy were decreased with increasing the age at harvesting. Chlories gayana and Eragrostis tef were the last effected grasses by increasing the age at harvesting. It is recommended that, not to delay the harvesting beyond 45 day of age. Some introduced grasses Chlories gayana and Eragrostis tef performed better than the grasses under study and should be subjected to more research as promising forge crops.
URI: http://khartoumspace.uofk.edu/123456789/24711


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