JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Ensiling of Sweet Potato Leaves (Ipomoea batatas (L.) Lam) and the Nutritive Value of Sweet Potato Leaf Silage for Growing Pigs
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Ensiling of Sweet Potato Leaves (Ipomoea batatas (L.) Lam) and the Nutritive Value of Sweet Potato Leaf Silage for Growing Pigs
An, Le Van; Lindberg, Jan Erik;
  PDF(new window)
 Abstract
The effect of adding carbohydrate-rich feedstuffs to sweet potato leaves (SPL) on silage quality was studied using a total of 180 laboratory silos. Silage quality was assessed by changes of pH, dry matter (DM), crude protein (CP) and ammonia nitrogen (-N). Pre-wilted SPL was mixed with cassava root meal (CRM), sweet potato root meal (SPM) or sugar cane molasses (Mo) at levels of 0, 30, 60 and 90 g (air-dry weight of additives to pre-wilted weight of SPL). Samples for assessing silage quality were collected after mixing the SPL with the additive and thereafter at 7, 14, 28 and 56 days of ensiling. There was a marked decrease in pH after 7 days and the pH remained low and stable until day 56. Addition of 60 and 90 g resulted in a lower pH (p<0.05) than the other treatments. The DM content of the silage increased (p<0.05) with increasing levels of additive, while there were no differences in DM with time of ensiling. The CP content of the silage decreased (p<0.05) with increasing levels of additive. The CP content did not change up to 28 days, but was lower (p<0.05) after 56 days in all treatments. The -N levels were increasing (p<0.05) with time of ensiling, and were lower (p<0.05) with additive levels of 60 g or higher. Also, the additive source affected the -N values, with the lowest values found for Mo. Castrated male pigs (Large WhiteMongcai) were used in 44 Latin square design to study the total tract digestibility and nitrogen (N) utilisation of diets with inclusion of ensiled SPL. The diets were based on cassava root meal with inclusion of protein from either fish meal (C) or SPL ensiled with CRM (D1), SPL ensiled with SPM (D2) and SPL ensiled with Mo (D3). The digestibility of DM, organic matter (OM) and CP were higher (p<0.05), and the digestibility of crude fibre (CF) was lower (p<0.05), in diet C than in diets D1, D2 and D3. However, there were no differences (p>0.05) in digestibility of dietary components between diets D1, D2 and D3. Also, the excretion of N in faeces was higher (p<0.05) and the N retention was lower (p<0.05) in diets D1, D2 and D3 than in diet C. It can be concluded from the present experiments, that a good quality silage can be produced from pre-wilted SPL by addition of 60 g of either CRM, SPM or Mo. Diets with inclusion of 450 g ensiled SPL DM showed a high digestibility of dietary components and thus ensiled SPL should be considered as a potential feed resource for growing pigs.
 Keywords
Sweet Potato Leaves;Silage;Additive;Cassava Root Meal;Sweet Potato Root Meal;Sugarcane Molasses;Digestibility;Growing Pigs;
 Language
English
 Cited by
 References
1.
Abou-Raya, A. K., R. M. Habit, W. H. Abdel-Malik, A. M. Makky and M. K. Hathout. 1973. Effect of chopping and molasses addition on the nutritional qualities of trench silage prepared from first cut of clover-ryegrass mixture. Agric. Res. Review. 51:41-60.

2.
Agricultural Research Council. 1981. The nutrient requirement of pigs. Commonwealth Agricultural Bureau, Farnham Royal, London.

3.
An, L. V., B. E. F. Lindberg and J. E. Lindberg. 2003. Effect of harvesting interval and defoliation on yield and chemical composition of leaves, stems and tubers of sweet potato (Ipomoea batatas L. (Lam.)) plant parts. Field Crops Res. 82: 49-58.

4.
AOAC. 1990. Official Methods of Analysis. 15th edn. Association of Official Analytical Chemists, Arlington, Virginia.

5.
Dominguez, P. L. and J. Ly. 1997. An approach to the nutritional value for pigs of sweet potato vines (Ipomoea batatas (L.) Lam). Livest. Res. Rural Dev. Vol. 9, No. 2. 1997.

6.
Echeverria, V., R. Belmar, J. Ly and R. H. Santos-Ricalde. 2002. Effect of Leucaena leucocephala leaf meal treated with acetic acid or sodium hydroxide on apparent digestibility and nitrogen retention in pig diets. Anim. Feed Sci. Technol. 101:151-159.

7.
Haigh, P. M. 1996a. The effect of dry matter and silage additives on the fermentation of bunker-made grass silage on commercial farms in England 1984-91. J. agric. Engng Res. 64:249-259.

8.
Haigh, P. M. 1996b. The effect of dry matter and silage additives on the fermentation of bunker-made grass silage on commercial farms in Wales 1987-93. J. agric. Engng Res. 64:261-270.

9.
Ishida, H., H. Suzuno, N. Sugiyama, S. Innami, T. Tadokoro and A. Meakawa. 2000. Nutritive value on chemical components of leaves, stalks and stems of sweet potato (Ipomoea batatas Poir). Food Chem. 68:359-367.

10.
Jaurena, G. and G. Pichard. 2001. Contribution of storage and structure polysaccharides to the fermentation process and nutritive value of lucerne ensiled alone or mixed with cereal grains. Anim. Feed Sci. Technol. 92:159-173.

11.
Lattemae, P., C. Ohlsson and P. Lingvall. 1996. The combined effect of molasses and formic acid on quality of red-clover silage. Swedish J. agric. Res. 26:31-41.

12.
Lindberg, J. E. and C. Andersson. 1998. The nutritive value of barley-based diets with forage meal inclusion for growing pigs based on total tract digestibility and nitrogen utilization. Livest. Prod. Sci. 56:43-52.

13.
Lindberg, J. E. and Z. Cortova. 1995. The effect of increasing inclusion of lucerne leaf meal in a barley-based diet on the partition of digestion and on nutrient utilization in pigs. Anim. Feed Sci. Technol. 56:11-20.

14.
Ly, J., J. L. Reyes, M. Macias, V. Martinez, P. L. Dominguez and R. Ruiz. 1998. Ileal and total tract digestibility of leucaena meal (Laucaena leucocephala Lam. de Wit) in growing pigs. Anim. Feed Sci. Technol. 70:265-273.

15.
McDonald, P., N. Henderson and S. Heron. 1991. The Biochemistry of Silage. Second edition, 1991. p. 340.

16.
Minitab Reference Manual. 1998. Release 12 for Windows. Minitab Inc., USA.

17.
Moseley, G. and V. Ramanathan. 1989. The effect of dry feed additives on the nutritive value of silage. Grass and Forage Sci. 44:391-397.

18.
O'Doherty, J. V., P. Nowakowsk and T. F. Crosby. 1998. The effect of feeding grass silage and molasses sugarbeet pulp either separately or as an ensiled mixture to twin-bearing ewes. J. Agric. Sci. Cambridge. 130:217-227.

19.
Phuc, B. H. N. and J. E. Lindberg. 2000. Ileal and total tract digestibility in growing pigs given cassava root meal diets with inclusion of cassava leaves, leucaena leaves and groundnut foliage. Anim. Sci. 71:301-308.

20.
Phuc, B. H. N. 2000. Tropical forages for growing pigs. Ph.D. Thesis, Swedish University of Agricultural Sciences, Acta Universitatis Agriculturae Sueciae, Agraria 247.

21.
Phuc, B. H. N., B. Ogle and J. E. Lindberg. 2000. Effect of replacing soybean protein with cassava leaf protein in cassava root meal based diets for growing pigs on digestibility and N retention. Anim. Feed Sci. Technol. 83:223-235.

22.
Sibanda, S., R. M. Jingura and J. H. Topps. 1997. The effect of level of inclusion of the legume Desmodium uncinatum and the use of molasses or ground maize as additives on the chemical composition of grass- and maize-legume silages. Anim. Feed Sci. Technol. 68:295-305.

23.
Wenk, C. 2001. The role of dietary fibre in the digestive physiology of the pig. Anim. Feed Sci. Technol. 90:21-33.

24.
Woolfe, J. A. 1992. Sweet potato: an untapped food resource. Cambridge University Press, Cambridge.