Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/116931
Type: Journal article
Title: Nutrient utilisation in grower pigs fed boiled, ensiled or milled cassava roots blended with a high protein concentrate
Author: Dom, M.
Ayalew, W.
Glatz, P.
Kirkwood, R.
Hughes, P.
Citation: Journal of South Pacific Agriculture, 2016; 19:22-35
Publisher: University of the South Pacific - School of Agriculture and Food Technology
Issue Date: 2016
ISSN: 1018-7774
Statement of
Responsibility: 
Michael T. Dom, Workneh K. Ayalew, Philip C. Glatz, Roy N. Kirkwood and Paul E. Hughes
Abstract: Cassava is a major pig feed ingredient used by smallholder farmers in tropical countries where it is grown abundantly. Due to its high starch content cassava roots may replace maize or wheat as the energy component of rations fed to pigs. A metabolic experiment was conducted using a 4 × 4 Latin Square design to determine the apparent total tract digestibility (ATTD) of nutrients, energy and ni- trogen balance of cassava roots prepared by boiling (BR45), ensiling (ER45) or milling into dry meal (MR45). The cassava products (55%DM) were blended with a wheat based protein concentrate (Pig Conc. 1 at 45% DM), and compared with a wheat-based standard feed (STD) offered to (Landrace × Large White) × Duroc grower pigs (28.0 ± 0.8 kg). DM intakes of pigs were higher on the cassava diets (P < 0.05) in the order; BR45 > ER45 > STD > MR45. Growth rate (ADG) and feed efficiency (FCR) on MR45 (1138 g/d and 1.81) were better than on STD (847 g/d and 2.41), whereas ER45 (856 g/d and 2.59) was similar to STD (P > 0.05). BR45 was similar to STD for ADG (919 g/d) but not for feed efficiency (3.12). The ATTD of DM, organic matter (OM), calcium and energy utilisa- tion (%) in pigs fed the cassava diets were higher (P < 0.05) than the control diet. Overall mean pro- tein (78.1% CP), CF (34.3%), fat (64.2% EE) and phosphorus (43.9% Total P) ATTD were similar for all diets (P > 0.05). N digestibility (77.9% intake) and N utilisation (64% digested) were also sim- ilar (P > 0.05). N retained by pigs on MR45 (25.1 g/d) was lower than on STD (27.6 g/d). However, higher N retained (P < 0.05) on BR45 (32.0 g/d) and ER45 (31.3 g/d) did not result in improved FCR or ADG, suggesting that high DM intake of soluble dietary fibre may have affected N utilisation, even if energy utilisation was increased by hindgut fermentation. Nevertheless, cassava roots blended with the complementary protein concentrate provided improved nutrition for grower pigs. Ensiling cassava roots allows the option of long term storage of fermented feed with potential benefits to gut health. However, growth performance trials are required to refine the nutrient requirements for local crossbred pigs farmed in tropical climates.
Keywords: Apparent total tract digestibility; cassava roots; grower pigs; nitrogen balance
Rights: This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.
RMID: 0030075852
Published version: http://www.journalofsouthpacificagriculture.com/index.php/JOSPA/article/view/5
Appears in Collections:Animal and Veterinary Sciences publications

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