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Feeding cassava foliage to sheep

nutrient properties and hydrogen cyanide toxicity

Hue, Khuc Thi (2012). Feeding cassava foliage to sheep. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2012:4
ISBN 978-91-576-7688-7
[Doctoral thesis]

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The potential of cassava foliage (Manihot esculenta Crantz) as a protein-rich feed in sheep production in Vietnam was examined by studying cassava foliage yield, hydrogen cyanide (HCN) content, toxicity and performance of lambs fed the foliage as a supplement.

Cassava foliage fed ad libitum as a protein supplement to a basal diet of urea-treated rice straw gave similar lamb live weight gain (LWG) as diets supplemented with commercial concentrate or protein-rich foliage of stylosanthes (Stylosanthes guianensis) or jackfruit (Artocarpus heterophyllus).

Field studies showed that higher harvesting frequency gave higher yield of cassava foliage. A K94 cassava variety always gave the highest foliage yield. Content of dry matter (DM), neutral detergent fibre (NDF), acid detergent fibre (ADF) and total tannins in the cassava foliage increased with plant and leaf maturation, while crude protein (CP) and HCN content decreased. Total tannin content was highest at first harvest and decreased slightly at subsequent harvests, while the reverse was true for HCN content. Different cassava varieties and degrees of processing (fresh, wilted or hay) resulted in differences in foliage HCN content.

Feeding cassava foliage at 2% of body weight (BW) from the start led to wasted feed, but prolonging the adaptation period to 21 days resulted in lower LWG. A 7-day period for adaptation to cassava foliage was a good compromise for lamb performance and health.

Feeding cassava foliage as fresh, wilted or hay did not result in any difference in LWG, but hay had lower DM and CP digestibility. Inclusion of cassava in the diet of sheep had a positive nematode control effect, but HCN consumption and thiocyanate concentration in urine increased with increasing foliage intake.

Authors/Creators:Hue, Khuc Thi
Title:Feeding cassava foliage to sheep
Subtitle:nutrient properties and hydrogen cyanide toxicity
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2012
Number of Pages:54
I.Hue, K.T., Van, D.T.T. and Ledin, I., 2008. Effect of supplementing urea treated rice straw and molasses with different forage species on the performance of lambs. Small Ruminant Reserach 78, 134-143.
II.Hue, K.T., van, D.T.T., Ledin, I., Wredle, E. and Spörndly, E. 2011. Effect of harvesting frequency, variety and foliage age on nutrient composition, hydrogen cyanide content and yield of cassava foliage. (Submitted to the Asian-Australasian Journal of Animal Science).
III.Hue, K.T., Van, D.T.T., Ledin, I. Spörndly, E. and Wredle, E. 2011. Effect of different adaptation strategies when feeding fresh cassava foliage on intake and physiological responsed of lambs. Tropical Animal Health and Production 44 (2), 267-276.
IV.Hue, K.T., Van, D.T.T., Ledin, I., Spörndly, E. and Wredle, E. 2010. Effect fo feeding fresh, wilted and sun-dried foliage from cassava (Manihot esculenta Crantz)on the performance of lambs and their intake of hydrogen cyanide. Livestock Science 131, 155-161.
Place of Publication:Uppsala
Publisher:Dept.of Animal Nutrition and Management
ISBN for printed version:978-91-576-7688-7
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L02 Animal feeding
L Animal production > L51 Animal physiology - Nutrition
Subjects:Obsolete subject words > FORESTRY, AGRICULTURAL SCIENCES and LANDSCAPE PLANNING > Animal production
Obsolete subject words > VETERINARY MEDICINE > Physiology and nutrition
Agrovoc terms:sheep, cassava, digestibility, animal feeding, animal nutrition, animal production, viet nam
Keywords:adaptation, Cassava foliage, digestibility, growth , harvest, hydrogen cyanide, lamb, Manihot exulenta Crantz, processsing , thiocyanate, variety
Permanent URL:
ID Code:8617
Department:(VH) > Dept. of Animal Nutrition and Management
External funders:Swedish International Development Cooperation Agency
Deposited By: Eva Spörndly
Deposited On:07 Mar 2012 13:07
Metadata Last Modified:02 Dec 2014 10:49

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