Livestock and poultry wastes management in Swaziland

ABSTRACT

A survey was carried out to assess the methods of livestock and poultry wastes management in Swaziland. The survey adopted the use of questionnaires which sought for information on the types of wastes generated, types of litter materials used, methods of wastes collection, predisposal wastes treatment, wastes utilization and possible effects of the wastes on the environment. Additional information was collected through personal communication and focused group discussions during the field trips while administering the questionnaires. Points of information gathering were commercial poultry and livestock farms, homesteads, dip tanks and feedlots. The data were analysed using percentages and frequencies, and the results presented in tables. Major solid wastes generated were from animal dung, poultry droppings and litters. Saw dust was the most popularly used litter material by about 38.7% of the large scale establishments while crushed com cob was the least used by about 5.3%. Urine and spent water from washing in milking parlours and dip tanks constituted the liquid wastes. Waste collection was by manual scrapping with spades, sweeping and floor washing using water hoses, and use of mechanical scrappers. Manual scrapping was the most predominant method for solid wastes collection. It was used by about 60% and 95.8% of the large scale establishments and homesteads respectively. Mechanical scraping was mainly used in the large scale establishments. Solid wastes were either collected and taken directly to the field for application or temporarily stored in compost pits and refuse dumps to undergo further decomposition. Only 33.3% of the homesteads had temporary dump sites. In most homesteads, kraal manure is removed during land preparation which eliminates the need for storage. About 33.3% of the large scale establishments had dump sites, 17.4% had compost pits while 16% had a combination of dump sites and compost pits. Liquid wastes were disposed off on strip fields or adjacent streams. About 75.0% of the homesteads and 33.3% of the large scale establishments conveyed their wastes using wheel barrows while 4.2% and 26.7% respectively made use ofa combination of wheel barrows and tractor trailers. All the homesteads and about 72.0% of the large scale establishments used solid wastes as fertilizers on their own farms. Liquid effluent was used for irrigation by about 5.3% of the large scale establishments. The ministry of agriculture and cooperatives is emphasizing the use of livestock wastes in fish farming while the biogas plants which were established to utilize some of the wastes have been abandoned. Respondents admitted awareness of the dangers inherent in poor livestock and poultry wastes management but only a few admitted that their management techniques constituted any hazards to the environment. Solid wastes as presently generated, collected and utilized constitute no environmental threat but the liquid discharged to streams and wet cattle that wade through streams immediately after dipping are considered potential sources of pollution. Wastes are a potential source ofbiogas which is being effectively utilized in many countries. The abandoned biogas pilot schemes should be reactivated. Water quality assessment should be carried out on streams to which wastes are discharged and appropriate steps taken to prevent pollution. Oxidation ponds should be constructed near dip tanks and milking parlours. More extension work is required to educate the rural populace on the use of livestock wastes for fish farming.