Abstract
The study was conducted in 15 households planting sweet potato in Tan Thanh and Thanh Loi communes of Binh Tan district, Vinh Long province and the laboratory of ruminant production techniques, Department of Animal Sciences, College of Agriculture, Can Tho University from October 2019 to March 2020. The sweet potato variety studied was Japanese purple sweet potato with a surveyed area of 100 m2 per household. The objective of the study was to evaluate the yield and chemical composition of sweet potato vines and tubers. For sweet potato vines, the results showed that the yield was quite high, ranging from 2.04 to 3.03 tons/ha. Dry matter (DM), ash and crude protein (CP) contents considerably fluctuated, while ether extract (EE) was stable. Mean DM, CP, neutral detergent fiber (NDF) and EE were 13.67, 11.01, 41.71 and 3.36%, respectively. Harvested sweet potato tubers had the yield to be 26.97 tons/ha and the yield of their by-products (tubers did not meet commercial standards concerning the tuber size and other agents) was 4.76 tons/ha. The chemical composition of sweet potato tuber by-product had a negligible fluctuation with DM value of 27.94%, CP 3.12%, ash 2.97%, ADF 7.78%, NDF 20.84% and EE 1%.
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