Abstract
Ruminants have low efficiency of nitrogen utilisation; unutilised nitrogen is being excreted in the faeces and urine. The most effective way to minimise nitrogen losses in ruminant production is through efficient feeding strategy. Ruminant manure is an inevitable consequence of its production. All these have adverse environmental effects. Composting and vermicomposting have been suggested as efficient tools for recycling manure, these bring a stabilised and sanitised end product for agriculture. Composting process is an accelerated aerobic degradation of fresh organic matter by microorganism to mature compost. Nevertheless, it may bring some environmental problems by releasing gases which include ammonia, methane and nitrous oxide, reduce the agronomic value of the manure and increase the cost of composting through turning of the compost to ensure aeration. To overcome the cost of composting and produce high quality products, vermicomposting is being recommended. Vermicomposting involves the bio-oxidation and stabilisation of organic material by the joint action of earthworm and microorganism. Moreover, the combination of composting and vermicomposting has been considered as a way of achieving stabilised substrates. Ensiled cattle manure treated with straws has been used to improve nutritional quality of ruminant feed and the result was encouraging. Vermicast, an end product of vermicomposting has higher nutrients content compared with manure or composted manure. Therefore vermicomposting of ruminant manure with rice/wheat straws might have the potential of being used as feed supplement to small ruminant. The likely benefit will be an increase in feed intake, increase in microbial protein supply, increase in fibre digestibility and possibly an increase in weight gain. The aim of this review is to discuss nitrogen losses in ruminant production and manure management and to provide an insight on the possibility of using vermicast as feed supplement to ruminants and as probiotic for treating fibrous feed.
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Introduction
According to O’mara (2011) Animal agriculture contributes 8–10 % of global greenhouse emission. This is dominated by emissions from ruminants. According to Tamminga (2003) a number of soluble and gaseous compounds directly or indirectly originating from animal production are known to have a negative effect on the environment. Animal metabolism and faecal excretion are responsible for direct emissions (Dijkstra et al. 2011a; Tamminga 1992). Methane and Nitrous Oxide emissions are an environmental concern because of their global warming potentials are 25 and 298 times than that of CO2 respectively (IPCC 2007). Undigested and unutilized nutrients are excreted into the environment in the form of faeces and urine together with fermentation and respiration gases (Dijkstra et al. 2011b; Hristov and Jouany 2005; Tamminga 1992). Nutrient losses from animal production are inevitable, excessive animal waste are mainly from an intensive ruminant production (management), high stocking density, and or from feeding nutrients more than required by the animal (Tamminga 1992). Proper utilisation of manure is required to achieve long term sustainability in livestock production. This can be achieved through composting (Hao et al. 2001, 2004), vermicomposting (Loh et al. 2005; Gutiérrez-Miceli et al. 2008) and biogas production (Amon et al. 2007; Massé et al. 2011).
In developing countries, livestock depends on fibrous crop residues, these have low digestibility, low protein content, poor palatability and bulkiness (Zadrazil et al. 1995). To enhance animal’s performance, the nutritional quality and palatability of fibrous crop residues have to be improved. This can be achieved by manipulating ruminal fermentation. For decades efforts have been put to produce ingredients for animal feedstuff from manure. The aim of this review is to discuss the various stages of Nitrogen losses in ruminant production, manure management and the potential of using vermicomposting product (vermicast) as feed supplement, probiotic and mean of feed treatment to ruminants.
Nitrogen losses in ruminants
Livestock has low efficiency of Nitrogen utilisation, it ranges from 5 to 45 % depending on animal type, system and management (Oenema 2006). Nutrients profile in the feed, chemical and or biological treatment have direct effect on animal productivity as well as faecal (van Vliet et al. 2007) and urine output, these depends on how the nutrients involved are utilised. van der Stelt et al. (2008) found that reducing dietary crude protein level by 25 % of 200 g/kg of dry matter result in 21 and 66 % decrease of N-losses in faeces and urine respectively, while on the other hand 75 % increase of 108 g/kg crude protein led to 56 % increase in total Nitrogen loss in the slurries. In another different experiment with protein-binding polyphenol compound Powell et al. (2009), reported that tannins decreases urinary Nitrogen lost and increases the faecal Nitrogen lost in cattle. This is also applies to small ruminant (Waghorn 2008). Dietary tannins are known to reduce the rate and extent of protein degradation in the rumen and increase metabolic faecal Nitrogen loss (Patra and Saxena 2011). The sources of ruminants faecal Nitrogen are endogenous losses and indigestible excretion from the intestines. In addition to faecal sources, ammonia lost from the rumen in form of urea form the sources of ruminants urinary Nitrogen. Another source of N-losses is from inefficient utilisation of absorbed protein for maintenance and for synthesis of milk and body protein (Tamminga 1992).
Ruminant manure nitrogen lost during storage
Ruminant manure from animal houses is a mixture of faeces and urine together with bedding materials, spilt feed and drinking water, and water used for washing. Slurries is collected from below slatted floors and have lower dry matter content than other manures, this is due to addition of washing water and little use of bedding materials. In housing systems where livestock are tied, the excretion is separated into solid manure (farmyard manure; FYM), mainly containing faeces and straw, and liquid manure, which is a mixture of water, urine and dissolvable faecal components (Sommer and Hutchings 2001). Ruminant manure is a valuable resource as a soil fertiliser providing both macro and micro nutrients required for the plant growth and is a low-cost alternative to mineral fertiliser (Lazcano et al. 2008). This enhances both livestock and crop production (Powell et al. 1999). Traditionally ruminant manure is normally spread in the farm without any treatment. When applied in excess to the land requirement can lead to environmental pollution. These include over fertilisation of soil, soil toxicity, dispersal of pathogens and weed seeds, odour, water pollution, and increase in greenhouse gas emission and may present health risk (Dominguez and Edwards 2011). Another problem with manure is its bulkiness as it contains a lot of moisture content making it difficult to haul to a distance place (Larney and Hao 2007). Manure characteristics are functions of farm management, animal diet and facilities (Mathot et al. 2012); Table 1.
In most countries livestock manure are stored for a month or more before applied into the soil (Sommer and Hutchings 2001). On the other hand, manure storage contributes to the atmospheric pool of gases such as ammonia, nitrous oxide and methane (Kulling et al. 2001). The degree of gas emissions depends on feed digestibility and general animal performance (Mathot et al. 2012). Due to this loses only about 52 % of Nitrogen excreted by livestock is estimated to be recycled (Webb et al. 2012). In manure, Nitrogen is lost as ammonia or nitrous oxide. Ammonia volatilisation is the major pathway for Nitrogen loss (van der Meer 2008; Ndegwa et al. 2008). Emission occurs due to manure exposure to atmosphere in barns, during storage and application (Hafner et al. 2012).
Composting and nitrogen lost
The environmental and health risk imposed by ruminant manure mentioned earlier is due to its non stabilisation. Stabilisation is degree of decomposition of a waste substance, which is reflected by decrease in level of microbial biomass activity and concentrations of labile compounds (Benito et al. 2003). According to Lazcano et al. (2008), composting and vermicomposting are two of the best known processes for the biological stabilisation of solid waste. Composting is a well established method for stabilising and sterilising materials before returning them to agricultural land (Parkinson et al. 2004; Larney and Hao 2007). Composting is a continuous aerobic degradation of organic materials by microorganism into humus-like substances (Bernal et al. 2009; Peigne and Girardin 2004). Traditionally farmers carried out composting of animal manure for easy handling, transport and management. Composting technology provide a better option for manure treatment with economic and environmental benefits. Composting process results to decrease in volume and weight of the biomass, elimination or reduction of pathogens spreading, destruction of weeds and phytotoxicity, decreased in C:N ratio, odour free and easily spread products (Eghball and Lesoing 2000; Gómez-Brandón et al. 2008; Hristov et al. 2011; Larney et al. 2003; Larney and Hao 2007). Compared with application of fresh manure, compost application in the field reduces Nitrogen losses (Peigne and Girardin 2004). Composting of animal manure is a technology which adds value and produces a high quality product for multiple agricultural uses (Bernal et al. 2009); Table 2.
There are nutrients losses during composting and the loss can either be in form of gases, liquid (leachate) or both. The losses can result to environmental pollution. Nitrogen losses through composting can occur by ammonia volatilisation, leaching and denitrification, and through chemo-denitrification (Hao et al. 2001). Manure composting result in degradation of protein, urea or uric acid, and this produce ammonium due to Nitrogen transformation which involve several biochemical reactions (Peigne and Girardin 2004). The losses is high during the active phase of composting when the temperature is rising and decomposition is taking place and this indicate intense mineralisation (Bernal et al. 1996; Hao et al. 2011).
Total Nitrogen losses during composting can be up to 42 % and related to the initial Nitrogen content in the manure (Eghball et al. 1997; Hao et al. 2004; Gómez-Brandón et al. 2008). Ammonia losses can account for about 92 % and losses through leachate account for <0.5 % (Eghball et al. 1997). This depends on the initial manure mixture and compost management employed. Addition of condensed tannins in the diet of ruminant was found to increase the agronomic value of the compost without increased in greenhouse gas emission (Hao et al. 2011). Aeration or turning frequency also affect Nitrogen lost during composting (Hao et al. 2001; Parkinson et al. 2004). Mechanical turning increases greenhouse gas emission (Hao et al. 2001).
More than 95 % of nitrous oxide is produced during the maturation phase of composting when readily available carbon sources has been depleted (He et al. 2001). Nutrients losses during composting are inevitable however nutrients in composted materials are less susceptible to leaching and volatilisation with advantage of suppressing pathogens and weed seed dispersal (Bernal et al. 2009), with ease of handling.
Vermicomposting of ruminant manure and Nitrogen loss
Composting reduces agronomic value of compost and contribute to greenhouse gas emission due to nutrients loss during compost making, in addition to energy loss due to labour or fuel required to turn the compost heap (Hao et al. 2001). The process requires long time period to be completed and sometimes the products are heterogeneous (Ndegwa and Thompson 2001). Vermicomposting is a mesophilic bio-oxidation process of organic materials that involve the joint action of earthworm and microorganism. This increases the rate of the decomposition process by accelerating the stabilisation of organic matter and greatly modifying its physical and biochemical properties (Dominguez 2011). Microorganisms produce the enzymes that cause biochemical decomposition of organic matter, but earthworm are the crucial drivers as they stimulate and increase biological activity by fragmentation and ingestion of organic matter and this will increase the surface area to be exposed to microorganism (Dominguez 2011). They also serve as agent of turning and aeration (Ndegwa and Thompson 2001).
A Vermicomposting process has two distinguished phases and is (1) an active phase; where the earthworm process the biomass, modifying its physical state and microbial composition. The effect of earthworm on the decomposition of organic matter during vermicomposting processes is due to gut associated processes (GAPs), and it includes the modification that organic waste and microbes undergo during their passage through the gut of earthworm. (2) A maturation like phase; also known as cast associated processes (CAPs) is marked by the displacement of the earthworm towards fresher layers of undigested waste, where the microbes take over in the decomposition of waste and the effects of earthworm are mainly indirect and derived from GAPs (Dominguez and Edwards 2011; Dominguez 2011); Fig. 1.
Nutrients losses in biological processes are inevitable. Methane loss is negligible during vermicomposting as the process is aerobic and no methane was detected from earthworm or its gut content (Karsten and Drake 1997). (Velasco-Velasco et al. 2011), observed that high temperature and low moisture content during vermicomposting of sheep manure are responsible for ammonia emission, Nitrogen loss by ammonia volatilization during vermicomposting was up to 15 % of the initial N content. A high nitrous oxide emission was reported by Frederickson and Howell (2003), during vermicomposting of organic waste, and this might be due to denitrification processes taking place within the guts of the earthworm. Earthworm guts are associated with denitrifying bacteria, these are responsible for nitrous oxide emission which can be up to 33 % of the total nitrous oxide emission from the soil, and it increase with moistened of earthworm with nitrate and or nitrite (Matthies et al. 1999). The nitrous oxide emission is from earthworm under aerobic condition and from their guts under anaerobic condition (Karsten and Drake 1997). However, compared with composting, vermicomposting promote Nitrogen retention and produced more stabilised products (Frederickson et al. 2007; Lazcano et al. 2008).
Pre-treatment before vermicomposting was suggested by Nair et al. (2006), as waste may contain substances that might be toxic to earthworm such as acidic compound and gases emission. Kumar et al. (2010), pre-treated sugar cane waste by-products with microorganism before vermicomposting and it accelerated degradation and significantly reduced the time required for stabilisation. Frederickson et al. (2007) and Ndegwe and Thompson (2001), suggested pre-composting then followed by vermicomposting, composting eliminate toxic compounds, pathogens and weeds since it undergoes thermophilic phase where the temperature can be more than 55 °C in contrast to vermicomposting which is mesophilic process where the temperature will not exceed 37 °C. However, Edwards and Subler (2011) reviewed literatures and stated that vermicomposting process eliminates or suppresses human pathogens. Lazcano et al. (2008), compared effectiveness of composting and vermicomposting for cattle manure stabilisation and found that pre-treatment with composting then followed with vermicomposting was the most effective in stabilising cattle manure. Vermicomposting is being used in ruminant manure stabilisation (Garg et al. 2006; Lazcano et al. 2008; Loh et al. 2005; Mitchell 1997; Velasco-Velasco et al. 2011).
Potentials of using vermicomposting products as feed supplement or probiotics to ruminant
With increasing human population food shortages will become an ever increasing problem, unless agricultural output can keep pace with population growth. Animal products are crucial in this regards. Inadequate supply of good quality feed is the main factor hindering the progress of animal production in many developing countries. There, livestock depends on fibrous crop residues, which have low digestibility, low protein content, poor palatability and bulkiness (Zadrazil et al. 1995). Coupled with famine the said feed will not be available at that period. To enhance animal’s performance the nutritional quality and palatability of fibrous crop residues have to be improved. This can be achieved by manipulating ruminal fermentation.
According to Wallace (1994), methods for manipulating ruminal fermentation that involve microbial biotechnology include dietary ionophores, antibiotics and microbial feed additives. For decades efforts have been put to produce ingredients for animal feedstuff from manure (Woesttyne and Verstrate 1995). To utilise cattle manure as feedstuff different processing methods (dehydration, compost silage, single cell protein production, pelleting, deep stacking, chemical preservation, and chemical enhancement of digestibility) have been employed (Bórquez et al. 2009; Sarwar et al. 2011). Usage of cattle manure as feedstuff in ruminant has the advantage of reducing pollution due to animal waste in addition to reducing feeding cost (Martínez-Avalos et al. 1998). However, some factors have affected efficient utilisation of cattle manure and these includes palatability, ease of handling, product quality and consumer acceptance (Bórquez et al. 2009). The method commonly used in treating cattle manure as feed resource is fermentation with soluble Nitrogen source such as urea and carbohydrate such as cane molasses through silage (Martínez-Avalos et al. 1998; Sarwar et al. 2006). Cattle manure was ensiled with urea/molasses/bakery by-product or corn stover treated straw with the aimed of improving feed quality. The results showed increased feed intake, nutrients digestibility, microbial protein supply and an increased in weight gain (Bórquez et al. 2009; Hassan et al. 2011; Martínez-Avalos et al. 1998; Sarwar et al. 2011). A cattle manure silage was used to replace concentrates (Bórquez et al. 2010). Up to 30 % cattle manure inclusion in silage making was recommended for optimal utilisation in ruminant feeding.
Aerobic processes of pre-treating cattle manure with composting will ensure suppression of weed seeds and pathogens. The pre-treated manure can be vermicomposted with straws (forages) with the aims of improving its nutritive value. This will increases the Nitrogen content of the vermicomposted treated straws. As evidences shows that vermicomposting reduces C:N ratio. This has the potential of feed supplement to ruminant. Vermicast can be a good source of Nitrogen to ruminant due its low C:N ratio with likely low solubility in the rumen (Bernal et al. 1993). This might reduce Nitrogen losses in the rumen and overall Nitrogen losses due to ruminant production and increases Nitrogen retention. Results from cattle manure being ensiled with straws and other agro-by-products and fed to ruminants are encouraging; likewise the performance of the animals fed ensiled cattle manure. From these, cattle manure treated with pre-composting before vermicomposting with roughages or other agro-by-products might produce similar result or even better. This may be due increase in Nitrogen content of vermicomposting products, reduction of fibre content from forages as some cellulolytic activities was observed during vermicomposting. pH value of vermicast is within the neutral range in contrast with silage products which has a lower pH value due to increase of lactic acid during silage, this may reduce rumen pH thereby reducing microbial activities, in some cases high amount of lactic acid in the rumen may lead to sub acute ruminal acidosis (SARA). The inclusion of pre- composted cattle manure can be varied from 0 to 40 % in order to ascertain the best level of inclusion for optimal performance.
Conclusion
Ruminant production is associated with Nitrogen loss especially in the form of ammonia from urine and manure management during composting. These contribute to greenhouse emission and environmental pollution in general. The most effective way to control and or minimise Nitrogen losses from ruminant production and their manure management is efficient strategic feeding that will provide the required nutrients without short or waste, in other words it should be through precision feeding. Pre-composting followed by vermicomposting provides an effective way of ruminant manure management. Vermicast a product of vermicomposting is a good soil fertiliser which has the potential of being feed supplement to ruminant. This can be achieved by pre composting of cattle manure and then vermicompost with forages. The inclusion of pre-composted cattle manure can be varied from 0 to 40 % in order to ascertain the best level of inclusion for optimal performance. Fibrous crop residues are ruminant feed available in developing countries in some month of the year. Therefore this potentiality should be explored with the aim of reducing environmental pollution from ruminant production and providing nutritional benefit to ruminant from their manure management. Pre-composting of ruminant manure and its subsequent vermicomposting provide a potential of feed supplement and probiotics to ruminant.
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Acknowledgments
The first author acknowledges USM-TWAS PG fellowship 2010 for fellowship award. The study was funded through Universiti Sains Malaysia (USM) grant (Grant No: 304/PTEKIND/650428). The authors acknowledge USM for providing research facilities.
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AN: Collected and reviewed the literature and drafted the manuscript. MHI and NI: Formulated the objectives, provided guidance and improved the quality of the manuscript. All authors read and approved the final manuscript.
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Nasiru, A., Ibrahim, M.H. & Ismail, N. Nitrogen losses in ruminant manure management and use of cattle manure vermicast to improve forage quality. Int J Recycl Org Waste Agricult 3, 57 (2014). https://doi.org/10.1007/s40093-014-0057-z
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DOI: https://doi.org/10.1007/s40093-014-0057-z