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Impact of fermentation on the nutritive value of cassava root pulp and soybean pulp as a feed for growing pigs in Lao PDR

Taysayavong, Lotchana (2018). Impact of fermentation on the nutritive value of cassava root pulp and soybean pulp as a feed for growing pigs in Lao PDR. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2018:67
ISBN 978-91-7760-274-3
eISBN 978-91-7760-275-0
[Doctoral thesis]

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Abstract

This thesis evaluated the impact of fermentation on the nutritive value of cassava root pulp (CRP) and soybean pulp (SBP) as feed for growing pigs. The evaluation was based on four studies (two fermentation and two animal studies). In these, the chemical composition of CRP aerobically fermented with four different yeast sources was evaluated; the digestibility, nitrogen balance, gut environment and visceral organ size were studied in growing Moo Lath and Large White pigs fed unfermented and fermented CRP and SBP; CRP and SBP were anaerobically fermented (ensiled) with or without rice bran; and the digestibility and nitrogen balance of the ensiled products was studied in growing Large White pigs.

Crude protein, true protein, neutral detergent fibre (NDF), starch and ash content in fermented CRP differed between yeast sources. Crude protein and ash content increased and starch content decreased with days of fermentation for all yeast sources and all levels of nitrogen addition (1.25, 2.5 %). The greatest increase in crude protein and ash content during fermentation was observed for Lao alcohol yeast. The greatest decrease in starch content was also found for Lao alcohol yeast, followed by Schwanniomyces occidentalis, Saccharomyces cerevisiae and Rhodotorula toruloides.

Organic matter and crude protein digestibility was higher for diets with SBP than for diets with CRP, and did not differ between pig breeds. Nitrogen retention, expressed as a proportion of nitrogen digested, was similar between breeds and was highest for fermented CRP and lowest for unfermented CRP. There were no effects of diet on gut environment or visceral organ size.

For both CRP and SRP, the pH decreased with days of ensiling and was elevated by inclusion of rice bran. Dry matter (DM) content increased with days of ensiling and with increasing inclusion of rice bran. In CRP, the crude protein content increased with days of ensiling, while there was a decrease in crude protein content in SBP. Increasing inclusion of rice bran elevated the crude protein content in CRP, but reduced it in SBP. Increasing inclusion of rice bran raised the ammonia-nitrogen (NH3-N) content in both CRP and SBP, and the content within pulp source remained elevated during ensiling.

Ensiling CRP and SBP with rice bran produced in a feed product that was well digested and utilised in growing Large White pigs, but with differences in palatability. Ensiling both forms of pulp with inclusion of rice bran (10% for CRP and 20% for SBP) improved the digestibility of both organic matter and crude protein, suggesting synergistic effects in the porcine gastrointestinal tract.

Authors/Creators:Taysayavong, Lotchana
Title:Impact of fermentation on the nutritive value of cassava root pulp and soybean pulp as a feed for growing pigs in Lao PDR
Series/Journal:Acta Universitatis Agriculturae Sueciae (1652-6880)
Year of publishing :1 November 2018
Depositing date:27 November 2018
Volume:2018:67
Number of Pages:78
Papers/manuscripts:
NumberReferences
ITaysayavong, L., Bakeeva, A., Passoth, V. & Lindberg, J.E. 2018. Impact of aerobic yeast fermentation on the nutrient content of cassava root pulp (Manuscript).
IITaysayavong, L., Lindberg, J.E. & Ivarsson, E. 2018. Digestibility, nitrogen retention, gut environment and visceral organ size in Moo Lath and Large White growing pigs fed unfermented and fermented cassava root pulp and soybean pulp. Livestock Research for Rural Development. Volume 30, Article #4. Retrieved January 1, 2018. Available at: http://www.lrrd.org/lrrd30/1/jan_s30004.html
IIITaysayavong, L., Ivarsson, E. & Lindberg, J.E. 2018. Ensiling of fresh cassava root pulp and fresh soybean pulp with or without rice bran. Livestock Research for Rural Development. Volume 30, Article #107. Retrieved August 20, 2018. Available at: http://www.lrrd.org/lrrd30/6/lotc30107.html.
IVTaysayavong, L., Lindberg, J. E. & Ivarsson, E. 2018. Nutritive value of ensiled cassava root pulp and ensiled soybean pulp as feed for growing pigs (Manuscript).
Place of Publication:Uppsala
Publisher:Department of Animal Nutrition and Management, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-7760-274-3
ISBN for electronic version:978-91-7760-275-0
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L01 Animal husbandry
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 402 Animal and Dairy Science > Animal and Dairy Science.
Keywords:smallholder farmer, digestibility, ensiling, rice bran, yeast
URN:NBN:urn:nbn:se:slu:epsilon-e-5128
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-5128
ID Code:15781
Faculty:VH - Faculty of Veterinary Medicine and Animal Science
Department:(VH) > Dept. of Animal Nutrition and Management
External funders:Swedish International Development Cooperation Agency
Deposited By: Impact of Lotchana Taysayavong
Deposited On:28 Nov 2018 08:26
Metadata Last Modified:28 Nov 2018 08:26
Project info:
Name:MEKARN II project
Acronym:MEKARN II

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