Effect of supplementation, breed, season and location on feed intake and performance of scavenging chickens in Vietnam
Minh, Do Viet (2005) Effect of supplementation, breed, season and location on feed intake and performance of scavenging chickens in Vietnam. Doctoral diss. Dept. of Animal Nutrition and Management, SLU. Acta Universitatis agriculturae Sueciae vol. 2005:101.
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The aims of the studies were to evaluate the nutrient status of local and improved scavenging hens in different seasons and locations by crop content analysis (Paper I), and the effects of scavenging and supplementing energy, protein, lysine and methionine on feed intake, performance, carcass quality and economic efficiency of different breeds of growing chickens and laying hens (Paper II, III and IV). In Paper I, the nutrient, metabolisable energy (ME) and amino acid intakes of scavenging Ri (local) and Luongphuong (improved) hens from scavenging feed resources (SFR) were estimated to be about 50 % higher for the rainy season compared to the dry season, and significant differences were found between breeds and locations. In Paper II, III and IV, the nutrient intakes from SFR were estimated to be at least 12 and 31 % of the nutrient intakes of confined growing and laying chickens, respectively. Supplement feed conversion ratios (FCR) and feed cost (FCS) were reduced by 12 to 36 % for scavenging chickens compared to confined chickens, depending on production type. Feed intake, performance and economic efficiency of scavenging local and improved laying hens were not significantly different among diets with supplementation of energy (maize meal only) compared to the control diet. However, protein supplementation (soybean meal only) reduced feed intake and performance of both local and improved hens, which indicated that energy supplementation was more important than protein for scavenging hens in Northern Vietnam. Lysine and methionine supplementation of diets for growing chickens reduced the supplement FCR and FCS by 12 and 16 %, respectively, and improved performance and carcass quality. The production performance of scavenging pullets and laying hens was not affected by replacing soybean meal (SBM) with cassava leaf meal, and fish meal with SBM in the diets of scavenging chickens.
It is concluded that scavenging chicken systems are sustainable and economical for both local and improved chicken breeds in Northern Vietnam. Economic benefits were 12 to 36 % higher compared to total confinement, and locally available feed resources such as cassava leaf meal can be used as supplements for scavenging chickens.
Faculty: Faculty of Veterinary Medicine and Animal Science
Amino acids, crop contents, energy, local and improved scavenging chickens, protein, scavenging feed resources.
chickens, layer chickens, animal breeding, feed crops, feed resources, supplementary feeding, nutrient intake, maize, soybean meal, seasonal variation, viet nam
Series.: Acta Universitatis agriculturae Sueciae
I. Minh, D.V., Lindberg, J.E. & Ogle, B. 2005. Effects of Season and Location on the Crop Contents of Local and Improved Scavenging Hens in Northern Vietnam (Submitted).
II. Minh, D.V. & Ogle, B. 2005. Effects of Scavenging and Supplementation of Lysine and Methionine on the Feed Intake, Performance and Carcase Quality of Improved Dual-Purpose Growing Chickens. Tropical Animal Health and Production. 37 (2005) 1- 15.
III. Minh, D.V., Ly, L. V. & Ogle, B. 2004. Effects of Energy and Protein Supplementation on the Production and Economic Efficiency of Scavenging Improved (Tamhoang) and Local (Ri) Breed Hens under Smallholder Conditions in Northern Vietnam. Tropical Animal Health and Production. 36 (7) 703- 714.
IV. Minh, D.V., Lindberg, J.E. & Ogle, B. 2004. Effects of Scavenging and Protein Supplement on the Feed Intake and Performance of Improved Pullets and Laying Hens in Northern Vietnam. Asian-Australasian Journal of Animal Sciences. 17 (11), 1553-1561.
Papers II, III and IV are included with the kind permission of the journals concerned.
Number of pages: 44
Year of publication: 2005
ID Code: 953
Deposited By: doviet, minh
Deposited On: 13 October 2005