SWEDISH UNIVERSITY OF AGRICULTURAL SCIENCES (SLU)
PhD studies supported by MEKARN
Evaluation of agro-Industrial by-products as protein sources for duck production in the Mekong Delta of Vietnam
Nguyen, Thi Kim Dong (2005) Evaluation of agro-Industrial by-products as protein sources for duck production in the Mekong Delta of Vietnam. Doctoral diss. Dept. of Animal Nutrition and Management, SLU. Acta Universitatis agriculturae Sueciae vol. 2005:81.
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This thesis is based on four studies to determine the nutritive value and ileal and total tract amino acid digestibility of agro-industrial by-products, and the effects of inclusion of these by-products in diets on the biological performance of growing crossbred Muscovy and common ducks in the Mekong Delta, Vietnam.
The results show that brewery waste (BW) was characterised by high protein content,good balance of essential amino acids, but high crude fibre content. The best growth performance was observed when 50% of the concentrate was replaced by BW for both Muscovy and common ducks. The crossbred Muscovies had better performance and gave higher economic benefit than the local Muscovies, and common ducks gave the lowest profit. BW could be offered either in mixed or separate feeding systems without any effects on performance and carcass yield (Paper I and II).
Soya waste (SW) and ensiled shrimp waste (ESW) are good protein sources, but low in dry matter (DM) and methionine content (SW) and high in chitin content (ESW). The best performance in terms of growth rate and carcass quality was found with replacement of up to 60% of soybean meal by SW, and only 20% of fish meal by ESW, which gave the lowest feed costs (Paper III).
The inclusion of ESW in diets for adult crossbred common ducks resulted in a linear decrease of the apparent total tract digestibility of dry matter, organic matter, ether extract, N free extract and N retention with increasing levels of ESW. The digestibility of individual amino acids followed a similar pattern to the nutrient digestibility. The apparent total tract digestibility of most individual amino acids was higher than the apparent ileal value (Paper IV).
It can be concluded that from nutritive and economic apects the three agro-industrial byproducts evaluated have proven to be acceptable feed ingredients in duck diets. Replacement up to levels of 20% (ESW), 50% (BW) and 60% (SW) of fish meal, concentrate and soybean meal, respectively, in diets for growing crossbred ducks can be recommended under the conditions of the Mekong Delta.
Faculty: Faculty of Veterinary Medicine and Animal Science
ducks, brewery waste, ensiled shrimp waste, soya waste, performance, profit, ileal digestibility, amino acids
animal nutrition, animal feeding, brewery byproducts, ducks, prawns and shrimps, soybeans, digestibility, amino acids, viet nam
Series.: Acta Universitatis agriculturae Sueciae
Papers I - IV The present thesis is based on the following papers, which will be referred to by their Roman numerals:
I. Dong, N.T.K. & Ogle, R.B. 2003. Effect of brewery waste replacement of concentrate on the performance of local and crossbred growing Muscovy ducks. Asian-Australasian Journal of Animal Sciences. 16 (10): 1510-1517.
II. Dong, N.T.K. & Ogle, R.B. 2004. An evaluation of brewery waste as a replacement for concentrates in diets for growing crossbred common ducks. Tropical Animal Health and Production. 36 (7): 715-729.
III. Dong, N.T.K., Elwinger, K., Lindberg, J.E & Ogle, R.B. 2005. Effects of replacing soybean meal with soya waste and fish meal with ensiled shrimp waste on the performance of growing crossbred ducks. Asian-Australasian Journal of Animal Sciences. 18 (6) 825-834.
IV. Dong, N.T.K., Elwinger, K., Lindberg, J.E & Ogle, R.B. 2005. Ileal and total tract digestibility of amino acids in ducks fed ensiled shrimp waste (Submitted).
Number of pages: 55
Year of publication: 2005
ID Code: 907
Deposited By: Nguyen, Thi Kim Dong
Deposited On: 31 August 2005