Small Ruminant Production Systems Research Articles

Small ruminant welfare: Levelling the playing field or raising the bar—A European perspective

There is a diversity of small ruminant production systems across Europe, which range from extensive upland and mountain systems with a low stocking rate and sometimes minimal supervision to more intensive and/or housed systems, for example for milk production from sheep and goats. This diversity, more prevalent than for other livestock species, leads to difficulties in evaluating the welfare of the individual animals concerned (because the experiences of animals are so different) with a related difficulty in creating common criteria for evaluating welfare across Europe as a whole, and in individual countries. Nevertheless, even without a valid, transparent and agreed basis for the evaluation of individual enterprises, it is still possible for livestock advisers and veterinarians, in collaboration with producers, to be proactive and to recommend on-farm measures, which could raise the general standard of care and, importantly, to have a major impact on the welfare of individual animals in these systems.

Possibilities to breed for resistance to nematode parasite infections in small ruminants in tropical production systems

Gastrointestinal nematode parasitism is the most important disease affecting livestock production systems in developing countries, particularly small ruminant production systems. Of particular importance are infections with the strongyle Haemonchus contortus. Integrated disease control strategies are required, including improved management, nutrition and wise use of anthelmintic chemicals. Increasingly, selection of sheep or goats for improved nematode resistance is viewed as a valuable option to complement other control measures. Breeding for resistance is possible because of the existence of extensive genetic variation in resistance, both within and between breeds of sheep and goats. Such breeding schemes are most likely to be based on choice of appropriate breeds adapted to the local environmental conditions, followed by phenotypic selection for resistance. Goal and selection objective traits are likely to include performance (e.g. growth rate) under conditions of parasite challenge, faecal egg count (FEC) and measures of anaemia. With current technologies, genetic markers are likely to be too expensive and logistically difficult to incorporate into breeding schemes in tropical or developing countries. Genotype by environment interactions may be expected, particularly when comparing animals in environments that differ in the extent of parasite challenge or differ in the quality of available nutrition. However, there is no reason to expect antagonistic genetic relationships between performance and resistance, and selection indices should be readily constructed that improve both performance and resistance. If FEC is decreased, then pasture contamination should also decrease, leading to additional benefits for all sheep grazing the same pasture. Finally, breeding for nematode resistance should lead to lasting and sustained improvements in resistance or tolerance. There is no empirical evidence to suggest that nematodes will evolve rapidly in response to resistant hosts, and mathematical models based on genetic and biological principles also suggest that resistance should be sustainable.

An assessment of GHG emissions from small ruminants in comparison with GHG emissions from large ruminants and monogastric livestock

Greenhouse gas (GHG) emissions are expected to cause global warming which results in extreme weather changes that could affect crop yields and productivity, food supplies and food prices. It is also expected that climate change will have an impact on animal metabolism and health, reproduction and productivity. On the other hand, the expected increased demand of animal origin products in the coming years will increase the reared animal numbers and consequently GHG emissions. This paper outlines the main GHGs emitted from livestock which are CO2, CH4 and N2O, coming from respiration, enteric fermentation and manure management respectively, with CH4 and N2O having the highest global warming potential. Ruminant livestock has the highest contribution to these GHG emissions with small ruminants share being 12.25% of the total GHG emissions from livestock's enteric and manure CH4, and manure N2O in CO2 equivalent, producing 9.45 kg CO2 equivalent per kg body weight with the respective values for cattle, pigs and poultry being 5.45, 3.97 and 3.25. Since the production systems significantly affect the GHG emissions, the grazing, livestock crop complex, and intensive ones account for 30.5%, 67.29% and 5.51% for total CH4 emission (from enteric fermentation and manure management) and 24.32%, 68.11% and 7.57% for N2O respectively. Taking into account the positive and negative impacts of small ruminant livestock production systems to the environmental aspects in general, it is recommended that a number of potentially effective measures should be taken and the appropriate mitigation technologies should be applied in order to reduce effectively and essentially the GHG emissions to the atmosphere, with no adverse effects on intensification and increased productivity of small ruminants production systems.

Selecting browse plants to supplement cassava peel-based diet for peri-urban small ruminants

Cassava ( Manihot esculanta) peel is routinely fed to ruminants in Ghana and most parts of Africa, but the low protein content and lack of suitable protein supplements limits its full exploitation in small ruminant production systems. This study assessed the suitability (degradation characteristics and synchrony between nitrogen release and organic matter degradation) of the leaves of three browse plants, chaya ( Cnidoscolus aconitifolius), ficus ( Ficus exasperata), and terminalia ( Terminalia catappa), as supplements for sheep fed a cassava peel-based diet. Four ruminally fistulated Djallonké wethers were used in a randomized complete block design experiment to determine ruminal disappearance of dry matter (DM), organic matter (OM) and nitrogen (N) from the three leaves and from cassava peels. For chaya, ficus and terminalia, OM content was 93.1%, 83.8% and 90.3% ( P < 0.05), respectively, whereas N was 3.4%, 3.1% and 1.7% ( P < 0.05, DM basis). The OM and N content in cassava peel was 95.3% and 1.0%, respectively. Ruminal DM disappearance of chaya, ficus, terminalia and cassava peel after 24 h of incubation was 79.0%, 36.4%, 48.0%, and 43.0% ( P < 0.05), respectively. The ratio of N released from chaya leaves to OM from cassava peel was 1:16 or lower during 24 h ruminal incubation, compared to 1:31 during the first 8 h and 1:25 after 12 h of incubation of ficus leaves. The ratio for terminalia leaves from 4 to 24 h of incubation ranged between 1:51 and 1:63. The high N content and ideal synchronous release of N and OM ratio of 1:33 (N:OM) made ficus leaves the most suitable supplement among the three browse leaves, with the potential to supply adequate N to optimize ruminal microbial protein synthesis in sheep on a cassava peel-based diet.

Tannins in tropical tree fodders fed to small ruminants: A friendly foe?

Livestock production systems worldwide rely largely on conventional feedstuffs. The current world food crisis highlights the need to improve the use of local resources for animal nutrition, such as fodder trees and shrubs. The detrimental effects of tropical tannin-rich plants (TRP) on animal production have been frequently described. In contrast, their potential benefits have long been neglected. This paper presents the potential positive effects of tropical TRP on small ruminants either as source of feed or as nutraceuticals with anthelmintic (AH) properties. It also analyses the host behavioral and physiological adaptations associated with exploitation of those tannin-rich resources. Both sheep and goats preferred a mixture of plants even when tannin-free forage was available. Moreover, the preference for TRP by goats and hair sheep were mainly associated with the digestible fraction of fiber and to a less extent with tannin content, which implies that they do not necessarily select against TRP. The addition of polyethylene glycol did not modify the preference or intake of TRP by goats and sheep. Evidence of physiological adaptation to TRP is presented and discussed. Both, experienced hair sheep and goats had saliva with tannin binding capacity, enabling both species to eat higher quantities of TRP which could lead to a higher availability of tannins in the gastrointestinal tract. Tannins in the gastrointestinal tract could be an AH against gastrointestinal nematodes (GIN). Indeed, in vitro and in vivo studies have shown AH effects of tannins from TRP, suggesting their possible use as natural anthelmintics against GIN. This paper supports the change in the current view of tannins in TRP as anti-nutritional compounds. If adequately managed, TRP can be a valuable component of sustainable small ruminant production systems.

Qualitative analysis of goat and sheep production data using self‐organizing maps

Abstract: The aim of this study was to analyse the relationship between different small ruminant livestock production systems with different levels of specialization. The analysis is carried out by using the self‐organizing map. This tool allows high‐dimensional input spaces to be mapped into much lower‐dimensional spaces, thus making it much more straightforward to understand any set of data. These representations enable the visual extraction of qualitative relationships among variables (visual data mining), converting the data to maps. The data used in this study were obtained from surveys completed by farmers who are principally dedicated to goat and sheep production. With the self‐organizing map we found a relationship between qualitative and quantitative variables showing that more specialized farms have greater milk incomes per goat, highlighting farms that have a greater number of animals, better facilities (including milking machines) or animals fed with elaborated diets. The use of self‐organizing maps for the analysis of this kind of data has proven to be highly valuable in extracting qualitative conclusions and in guiding improvements in farm performance.

The Importance of Interactions Among Nutrition, Seasonality and Socio‐sexual Factors in the Development of Hormone‐free Methods for Controlling Fertility

Around the world, consumers are demanding animal products that are produced to agreed standards for human health, environmental management and animal welfare. This has led to the development in Australia of the concept of 'clean, green and ethical' (CGE) animal production based on the manipulation of nutrition ('focus feeding') and the application of phenomena, such as the 'male effect', to provide 'natural' methods for managing small ruminant production systems. With respect to the management of fertility, CGE involves utilization of the inherited responses of animals to environmental factors to manipulate their reproductive processes. The successful development and implementation of this new generation of management tools depends on a thorough yet holistic understanding of the interactions among environmental factors and the ways these interactions affect reproductive physiology and behaviour of the animal. For sheep and goats, a central aspect of CGE management is the way in which ovarian function is affected by three major factors (nutrition, photoperiod and socio-sexual signals) and by interactions among them. Nutrition can exert two profound yet contrasting types of effect on ovarian activity: (i) the complete inhibition of reproduction by undernutrition through the hypothalamic mechanism that controls ovulation and (ii) the enhancement of fecundity by nutritional supplementation, through a direct ovarian mechanism, in females that are already ovulating. A similarly profound control over ovarian function in female sheep and goats is exerted by the well-known endocrine responses to photoperiod (seasonality) and to male socio-sexual signals. The 'male effect' already has a long history as a valuable technique for inducing a synchronized fertile ovulation during seasonal and post-partum anoestrus in sheep and goats. Importantly, experimentation has shown that these three major environmental factors interact, synergistically and antagonistically, but the precise nature of these interactions and their significance to reproductive outcomes are not well understood. Most research to date has been with small ruminants but CGE principles can be applied to any species in a managed environment. For example, a male effect has been reported for lactating cattle and, in the horse, the pattern of seasonality of oestrus can be altered by nutrition. Well-fed mares have a longer breeding season and some animals become non-seasonal. Similar observations have been reported for sheep and goats. By working towards a holistic perspective of the physiology, nutrition, genetics and behaviour of our animals, we will be able to formulate ways to manipulate the animals' environment that will improve management, productivity and profitability and, simultaneously, promote a CGE industry.

SMALL RUMINANT PRODUCTION IN TWO MIXED-FARMING SYSTEMS OF SOUTHERN ETHIOPIA: STATUS AND PROSPECTS FOR IMPROVEMENT

SUMMARYSmall ruminants are an integral part of mixed-farming systems throughout southern Ethiopia. Yet, they have received little research attention or institutional support. Characterizing the existing small ruminant production systems and analysing their production constraints are important tools to diagnose the status and trends of the systems, and thus to identify areas for future interventions. A survey was conducted between April and July 2004 in the Adilo and Kofele areas of the southern mixed-farming systems of Ethiopia to explore reasons for keeping small ruminants and to evaluate the existing status of and the prospects for the small ruminant sector. Additional information was obtained during discussions with key informants who had experience of small ruminant keeping. Small ruminants fill several roles in the study area. However, the principal purpose of keeping sheep and goats was to generate cash income. Sheep milk consumption was widespread around Kofele unlike most agricultural systems in the country. Nearly all respondents in Adilo reported fattening their sheep before sale, while such a practice was uncommon in Kofele. Informal insurance schemes were evolving among the sheep keepers in Adilo, and these can be considered as entry points for future interventions. The common problem identified from both individual interviews and group discussions was feed shortage. The identification of alternative feed resources and strategic feeding management might be options for development. Small ruminant disease was the major constraint in Kofele, where marshy areas are increasingly assigned for grazing in the rainy season as suitable land is more and more used for cropping. The growing demand for meat from small ruminants, the improving transportation infrastructure and the experience of farmers in small ruminant keeping are providing opportunities to enhance the contribution of the sector. A thorough monitoring of the productive and economic performance of small ruminants is required to capture the full picture of their contribution thereby directing possible intervention areas to maximize benefits to the farmers.

Comparison of grazing behaviour, dietary overlap and performance in non-lactating domestic ruminants grazing on marginal heathland areas

Abstract During the years 2000–2001, 7 non-lactating beef cows, 40 ewes and 40 does were managed in mixed grazing on a natural heathland vegetation plot (22 ha) with 20% improved pasture (perennial ryegrass) on a hill (1000 m a.s.l.) experimental farm located in the NW of Spain. Samples of faeces and vegetation components were collected monthly to estimate diet selection, using the alkane markers, and diet overlapping level. Animals were weighed monthly to quantify live weight changes and performance of the three livestock species during different periods (spring, summer, autumn, winter) of the grazing season. The percentage of shrubs in the diet was significantly higher in the small ruminants (ranging between 36% and 85%) than in cows (less than 25%) in any period. Gorse (Ulex gallii) and heather (Erica spp., Calluna) percentages were always significantly higher in does than in ewes, except in autumn for heather. Herbaceous component (namely grasses) was higher in cattle (75–99%) than in small ruminants (15–64%). The lowest mean dietary overlap was found between cattle and goats (50.4%), with large differences during the grazing season, ranging between 20% and 70%. The three animal species increased their live weight in the first grazing period (spring), when the mean sward height on the improved area was higher than 6.0 cm. However, when the sward height was lower than 3.5 cm (summer–winter), cows lost weight (− 437 g/day) while ewes and goats were still able to increase their weight (29 and 5 g/day, respectively). Therefore, it seems that small ruminants, mainly sheep, are more suitable than cattle from the vegetation utilization and animal performance points of view, as cows were unable to maintain live weight when the preferred grass availability decreases. Goats were the species that included the highest proportion of heathland vegetation components in the diet, especially gorse, although their performance was significantly lower than in sheep. In consequence, small ruminant production systems could be more sustainable than cattle. The results indicate that mixed grazing of sheep and goats could be appropriate in these vegetation communities, allowing the development of sustainable systems, in which animal performance and the efficiency of resource use are maximized.

Exploiting the effect of dietary supplementation of small ruminants on resilience and resistance against gastrointestinal nematodes

This paper focuses on targeted nutritional supplementation as a means to reduce the requirement for chemotherapeutic control of gastrointestinal nematode infection of small ruminants and considers the limitations to practical application. Supplementary feeding, particularly with additional dietary protein, can assist resilience to infection during times when metabolic resources are being directed towards dealing with the pathophysiological effects of infection and away from production of meat, milk and fibre. Substantial experimental evidence from studies of both sheep and goats supports this hypothesis particularly in relation to young lambs and kids after weaning and in ewes around parturition. In addition, nutritional supplementation frequently increases resistance to infection, as indicated by decreased faecal worm egg counts and worm burdens. As a result, supplementation has the potential to reduce the requirement for anthelmintic treatment. Practical application of this knowledge can, however, be quite complex in many small ruminant production systems. In general, strategic supplementation should target those times when nutrient requirements are greatest and provide those nutrients which are deficient whether protein, energy, minerals or trace elements. Complexity arises when we consider that nutrient requirements will differ between localities for different species and breed of host, at different stages of growth and reproduction, with differing seasonal availability of forage, with different species of nematodes and different levels of established infections and exposure to infective stages. As a starting point, the provision of nutrients to optimize rumen function and animal performance in the particular production system should assist in maintaining resilience to nematode infection. Provision of nutrients in excess of this requirement, if economically feasible, may yield further benefits in some situations and reduce the need for alternative control measures for gastrointestinal nematode parasites.

Sustainable Improvement of Small Ruminant Production in the Semi-Arid Areas of Lebanon

ABSTRACT Small ruminant production in semi-arid areas could be improved drastically by overcoming feed, health and management constraints. This study aimed at assessing the bio-economical sustainability of small ruminant production in the semi-arid regions of Lebanon through the introduction of an integrated technical package including: a basic health preventive program, feed optimization during critical late gestation period and finally, a basic selection program. Seventeen herders were divided into four groups: Groups A and B were given the full technical package with either soybean and corn meal or barley supplements, respectively. Group C received a basic preventive health program only and Group D was considered the control group. Bio-economic data were collected on a monthly basis over one year and submitted to a cost benefit analysis. Feed cost and pasture rent represented the major obstacles to productivity and contributed 53% and 33%, respectively, to the total financial cost. Groups A and B showed better financial revenues than groups C and D, with Group A having the highest return and lowest risk in terms of total expenditure and total revenue variances. It may be concluded that the integration of preventive health, feed optimization, and basic selection into one program could improve the economical sustainability of small ruminant production systems in semi-arid areas.

Classification of Cattle and Small Ruminant Production Systems in Sub-Saharan Africa

This paper presents a classification of cattle and small ruminant production systems in Sub-Saharan Africa (SSA). A review of literature has shown that there can be as many classifications of livestock systems as there are criteria to classify them, hence the need for a systematic classification to aid the analysis of livestock development in SSA. Agroecological zones principally determine cattle and small ruminant production systems in SSA. A classification of cattle and small ruminant systems is presented based on the length of growing period, rainfall, cropping and mean temperature during the growing period. The main traditional ruminant production systems are grassland-based (pastoral) systems, occurring mainly in areas with less than 90 days of plant-growing period, and mixed production systems occurring in areas with more than 90 days of plant growing. Mixed systems can be further differentiated on the basis of temperature during the growing period, into lowland mixed systems (semi-arid mixed, subhumid mixed and humid mixed) and highland mixed systems (highland mixed and smallholder dairy system, which is a non-traditional system). The non-traditional ruminant production systems are ranching and smallholder dairy systems. The authors conclude that, although a further categorization of livestock systems at individual country level may be produced, the classification presented here could be a basis for the analysis of livestock production in Sub-Saharan Africa, especially in livestock development analyses in which the individual livestock system is the unit of analysis.

Contribution of organic farming to increase sustainability of Mediterranean small ruminants livestock systems

The aim of the paper is to evaluate the feasibility and constraints of organic farming to increase the sustainability of Mediterranean small ruminant livestock systems. The paper analyzes the factors affecting sustainability of small ruminant livestock systems in the Mediterranean basin, such as seasonal forage availability or suboptimal pasture utilisation due to overgrazing but also the factor of undergrazing. The paper considers how the application of practices of organic farming may contribute to promoting sustainable land use and improving environment conservation, animal welfare, and product quality. Also the prospects of new information-based technologies, like geographic information systems and global positioning systems, to improve sustainability are presented. A model of pasture-based dairy sheep production system is proposed, with special emphasis on the organisation of a farm forage system to meet animal nutritional requirement. Some options for an integrated strategy for the control of parasitic disease in small ruminant production systems are discussed. These are based on a combination of general prevention methods (i.e. risk control and identification), grazing management (i.e. multifunctional grassland management), nonchemical treatments (i.e. homeopathic herbal preparations) and novel approaches (i.e. biological control and bioactive forages). Comparative effects of phytotherapy and conventional treatment on dairy sheep helminthic disease and on metabolic status and animal welfare are presented. The prospects of organic farming are of particular interest for the less favoured Mediterranean areas, where it may contribute to the safeguard of agricultural functions, like care and preservation of landscape, and safeguarding of rural villages with positive effects on the quality of life in rural communities. Some activities would be particularly appropriate in natural parks, where small ruminants and other domestic animals interact with wildlife and where biodiversity must be preserved. For positive results a new collaborative decision-making process is required between rural and urban communities, businesses and government. In addition, strong supports from scientific research and the extension services are needed to correct and fully utilize new information technologies to exploit the magnitude and potential of organic farming for enhancement of sustainable small ruminant production systems in the Mediterranean region.

The epizootiology of gastrointestinal nematode parasites in Greek dairy breeds of sheep and goats

Gastrointestinal (GI) parasitism represents a severe health problem in small ruminant production systems world-wide. The objective of the present study was three-fold: (i) to assess the prevalence of GI parasitism in dairy breeds of sheep and goats in selected areas of Greece; (ii) to determine the species of existing gastrointestinal parasites; and (iii) to investigate the effect of climatic factors on the seasonal variation of parasite population dynamics in dairy sheep and goats reared in two different geographical areas of Greece. The study was conducted in four flocks of either sheep or goats that were equally allocated in northern and central Greece. In each flock, faecal samples were randomly collected from 30 animals at monthly intervals and were used for nematode egg counts and coprocultures. Two animals from each flock were slaughtered monthly and their GI tract were examined for adult worm population and identification. The study revealed that the parasitic burdens in sheep were significantly ( P<0.05) higher than those in goats. Faecal egg counts for both sheep and goats were significantly ( P<0.01) affected by the month of the year and there was also a significant interaction between month of the year and area of study ( P<0.01). Teladorsagia, Haemonchus, Trichostrongylus and Chabertia were the most prevalent nematode genera in both sheep and goats. Such information could be useful for the development of strategic treatments when sheep and goats are reared under systems similar to those described in this study.

Economic sustainability of small ruminants production in semi-arid areas of Lebanon

Small ruminant production in the near east region is facing serious constraint of feed availability. A study was conducted in marginal areas of Lebanon, using a cost–benefit analysis technique (CBA), to assess the feasibility of four small ruminant production systems ranging from semi-nomadic to settled. When the owned labor cost was included as an opportunity cost in the economic analysis, CBA revealed negative returns in all four systems. Only the settled system was profitable according to the financial analysis excluding labor cost. Moreover, feed expenses if coupled with grazing costs represented a major constraint to profitability. To remedy to the feed deficit problem, the potential of using agro-industrial by-products as feed block supplements was investigated. Simulated feed block diets, using the most available by-products, provided a better nutritive value per unit cost than hand-fed diets used in the systems studied. Preliminary analysis showed that the use of feed block diets could improve the economic sustainability of small ruminant production systems.

COMPARISON OF CONSERVATION TILLAGE SYSTEMS IN BARLEY-BASED CROPPING SYSTEMS IN NORTHERN SYRIA

Yields of rainfed barley (Hordeum vulgare) for feed and forage in small-ruminant production systems in low-rainfall areas of North Africa and West Asia are limited by low and erratic water availability. Therefore, the testing of conservation farming techniques, effective in dryland systems elsewhere, is often suggested. Seven-year results from a typical site in northern Syria showed that zero-till (direct-drill) systems with cereal residue retention may marginally enhance soil moisture status, but the yield effect on barley, either monocropped or rotated with vetch (Vicia sativa), was small and non-significant. In the vetch–barley rotation, a small and fairly consistent benefit to vetch was observed, amounting to a 20% yield increase in vetch hay. Given smallholders' strong preference for barley and reluctance to grow vetch as an alternate crop, there is little in this result to encourage the promotion of zero-till conservation techniques in these farming systems.

Typical products of the small ruminant sector and the factors affecting their quality

At the present time, the farmers have to diversify the production types to maintain their market position and to fall in with consumers demands. They have privileged the typicality to create a fidelity with the consumers in the small ruminant production system, because of the long tradition and its less industrialisation. Of course the mean of this term varies according with people culture and tradition and with production (cheese, meat, fibre). In cheese field the differences between geographic areas, culturally homogeneous, are evident. In United Europe the historical and traditional motivations prevail and these products are protected by low. Some cheeses give their typicality to a breed, some other to the cellar, to a technique or to a feeding system. In USA, safety is the most important condition for the consumer. In Latin American countries people are giving more and more importance to the typicality even if there is a lake of regulations. In meat sector the situation is the same. The meaning of quality and typicality changes according to the local customs. In the more developed areas carcass quality is evaluated by grids that determine the price of the product. The quality indicated on many labels is made according to some grid evaluation. Quite different is the situation of the fibre sector. In the last years, the textile industry is discovering certain interest towards the typicality as regards the home-made, the ecological production and the naturally coloured wool. Consumers appear to be attracted by the typicality message if this term has some contents. Research is trying to study some factors influencing the typicality and in this report we referred about theirs. The future of a lot of small ruminant production depends from the capacity of research organisations to explore and to find the scientific reasons of typicality.

Infectious causes of small ruminant mortality in Kenya: A review

Small ruminant production systems in Kenya are briefly described. The types of study reporting small ruminant mortality rates, and the large range of values found, are documented and discussed. It was noted that reports from arid and semiarid areas greatly outweigh the number of reports from higher rainfall areas and that more data on mortality before weaning than at any other age are available. Indeed there was only sufficient evidence to draw conclusions regarding pre-weaning mortality rates from arid and semiarid areas, which appear to vary, between locations and from year to year, from 10 to 30% in lambs and from 20 to 30% in kids. Differences in mortality between sheep and goats, and singles compared to twins are discussed. The following infectious causes of mortality were reported in the literature reviewed: tick-borne diseases, including Nairobi sheep disease and heartwater, trypanosomiasis, fasciolosis, pneumonia, capripox, helminthosis, coccidiosis and enterotoxaemia. This review of the literature indicates that the majority of recorded small ruminant deaths are disease-related and that respiratory and intestinal diseases are the most important infectious causes. The quality and value of the available data, the design of on farm studies and the general requirements for animal health and production information in planning livestock development are discussed. Based on the deficiencies in current knowledge, recommendations for future research are made.

Small ruminant production systems and factors affecting lamb meat quality

The influence of sheep production systems on the environment of the Mediterranean area and the different productive systems of lamb in Spain are described. Moreover the actual knowledge (90s decade) about factors influencing the quality of lamb meat is reviewed, highlighting the importance of productive and pre-slaughter factors on carcass quality and post-slaughter factors on meat quality. Also the significance of culinary cultural back-ground on the acceptance of sheep meat is discussed.

Nutritional Enhancement of Parasite Control in Small Ruminant Production Systems in Developing Countries of South-East Asia and the Pacific

Nutritional insufficiency and gastrointestinal nematode parasitism are major constraints to small ruminant production in south-east Asia and the Pacific Islands. Research on the effects of low cost supplements which supply nitrogen and essential minerals on the ability of small ruminants to resist infection is summarised. In controlled pen studies in young Merino sheep offered a low quality roughage diet of oaten chaff and essential minerals, supplementation with urea reduced the effects of parasitic infection by increasing weight gain and wool production and reducing faecal egg output and parasite burden. In Fiji, field studies have shown that supplementation with urea-molasses blocks can result in increased live-weights of lambs at weaning, increased reproduction rates in maiden ewes and reduction in faecal egg output in grazing sheep. Additional benefits were derived from the inclusion of anthelmintic in the blocks in similar groups of sheep particularly during periods of greater susceptibility to parasites. Pen studies with young goats have shown that urea supplements alone gave no production benefits, but when accompanied by 100 g/d of cotton seed meal beneficial responses were observed. It is expected that parasite control in the small ruminant production systems of developing countries in south-east Asia and the Pacific Islands will benefit from the introduction of low cost nitrogen supplements along with anthelmintic therapy delivered strategically by molasses blocks.