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Tropentag, September 14 - 16, 2022, Prague

"Can agroecological farming feed the world? Farmers' and academia's views."

Nutritional value of fibre wastes of processed corn on feeding ruminants

Amirreza Safaei1, Taimour Tanha2, Alireza Aghashahi1, Ali Shad-Manaman2, Mansoureh Ameli1

1Animal Science Research Inst., Agricultural Research, Education and Extension Organization, Iran
2Payame Noor University, Dept. of Agriculture, Iran


Corn is the most important component of concentrate feeds in livestock which due to climate change and reduced rainfall, its price is always increasing and therefore the use of affordable corn waste, it seems necessary. After corn processing and starch extraction, by-products including corn germ, fibre and gluten are produced which are rich sources for ruminant nutrition. The aim of this study was to determine the chemical composition, fermentability, digestibility, ME and MP for corn fibre and corn gluten feed.

Samples of corn processing residues including germ, fiber and corn gluten feed were obtained from a company and the samples were transferred to the laboratory of Animal Science Research Institute of Iran and they were milled. Then the chemical composition, gas production and digestibility were measured. Gas production was measured using a mixture of rumen liquor from three fistulated bulls (Taleshi cow) for different fermentation times, including 2,4,6,8,12,16,24,48, 72 and 96 hours of ruminal incubation. Also, ME, MP and DMI of Corn processing residues were obtained.

Amount of organic matter, crude protein, crude fat, NDF, ADF, NFC and starch in corn fibre were obtained 89.3, 14.0, 3.3, 10.7, 70.2, 14.7 and 3.5% respectively; in corn germ were obtained 98.4, 9.4, 52.1, 1.6, 27.3, 9.9 and 10.7% (in order) and in corn gluten feed were obtained 94.9, 20.6, 3.5, 5.1, 53.1, 17.6 and 8.5 %, respectively. The gas production (at 24 hours of fermentation) of corn fibre and corn gluten feed were measured 37.7 and 61.5 (ml/200mg), respectively. The ME content of corn fibre and corn gluten feed were calculated 6.2 and 11.6 (MJ/Kg), respectively. OMD of corn fibre and corn gluten feed were measured 67.1 and 80.2%, respectively. The MP content of corn fibre and corn gluten feed (at maintenance level) were calculated 13 and 15.5 (g/kg) in order.

Due to the suitability of fermentability and digestibility of gluten corn feed, it seems this wastes is useful for feeding livestock. Corn gluten feed can be used as a substitute for the fibrous part of the ruminant diet. In general, the use of processed corn waste can reduce the cost of feed production in ruminants.

Keywords: Digestibility, gas production, processed corn wastes, ruminants

Contact Address: Taimour Tanha, Payame Noor University, Dept. of Agriculture, The West of Shaid Bagheri, Tehran, Iran, e-mail: tanha1351@yahoo.com

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