1. INTRODUCTION Samoa consists of two main islands, Upolu (1100 km2) and Savaii (1800 km2) and several small ones. Other inhabited islands are Manono and Apolima. The country forms the western part of the 500 km long Samoan archipelago. It is located in the South Pacific between 171 & 172o W and 14 & 13o S (Figure 1). In 1962, Samoa became the first country in the Pacific to gain independence. The total
land area is about 2,934 kmē with an exclusive economic zone of 120,000
kmē, which is the smallest in the South Pacific.
Samoa is ecologically fragile and vulnerable to environmental degradation of its natural resources. Because of its location, it is exposed to natural disasters - demonstrated by a succession of highly destructive cyclones: Ofa in February 1990 and Val in December 1991, which caused wide-spread damage to the country's economic base and infrastructure. In 1995 the population was around 169,000 people of which 90% were ethnic Samoans. The natural rate of population growth was around 2.4% per annum; however, emigration has reduced the actual population growth to 0.6% per annum (Tevita 1995). In the last census in 2006 the population was 179,186 and the SPC (SPC, 2008) mid-2008 population estimate is 179,645, with a mid-2010 estimate of 179,903 (and a 2008-2010 estimated growth rate of 0.1%). [According to the World Factbook the July 2008 estimated population is higher at 217,083, with a growth rate in 2008 of 1.322%]. Most people live in villages on or near the coast and normally farm the coastal strip and directly inland to the highest point or ridge line. There is a strong trend for people to move from rural areas to the capital, Apia, seeking better work and income opportunities. With the exception
of land owned by government and institutions (mainly churches), land
in Samoa is held under customary title. The matai, or holder of the
customary title, is entrusted with the management of the land which
cannot be sold. The matai in turn, distributes land to his or her
extended family for their use. Village councils and the Land and Titles
Court are active in allocating unused land and settling disputes over
claims to land. Table
1: Samoa statistics for livestock numbers, beef, veal, pig meat and
milk production,
Samoa's economy is based on primary production, much of it at subsistence level. Crops, livestock, fisheries and forestry account for 42% of GDP. The main crops produced are coconut (Cocos nucifera), cocoa (Theobroma cacao) and banana (Musa spp.). A major staple, as well as export crop, was taro (Colocasia esculenta) but production has declined due to taro leaf blight (Phytophera colocasia). Recently, due to the destructive effects of cyclones and taro blight, farmers have sought to diversify to taamu (Alocasia spp.), ava (Piper methysticum), and cattle production (Lee 1995a). Samoa has a cattle herd of around 28 - 29,000 head producing approximately 1000 tonnes of beef and veal and 1500 tonnes of milk annually (Table 1). In 2002 a further importation of just under 2000 head of cattle (1827) took place by ship from Townsville, Australia. Imports of mutton, beef, chicken meat and fresh milk are considerable. |
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THE PASTURE RESOURCE Nationally, the intensity of land use is quite low, and sales of agricultural products have declined over the last thirty years. Even though the trend is now reversing, there are large areas of unused land which have previously been cleared for plantation agriculture. The largest single area of under-utilised agricultural land is old coconut plantations. Coconut plantations are found generally in a coastal band up to 300 m altitude, on all but very steep slopes, and on soil of moderate to high productive capacity. There is an estimated 38,000 ha (FAO 1995) of under-utilized, mainly weed infested (mainly Psidium guajava, Sida spp., Ficus spp., Hibiscus tiliaceous, Macaranga spp.), coconut plantations in Samoa. This is the most abundant, and most economically and environmentally favourable land type for pastoral expansion. Rehabilitation of these areas for cattle production also increases the production levels from coconut enterprises by up to 50%, depending on the type of development and level of management (Reynolds 1995). Historically coconut plantations have been given high priority in land allocation. Promotion of pastoral development within the 'coconut belt' is seen as a desirable strategy because:
Land with appropriate access, slope, fertility and tenure characteristics is in sufficient supply for the on-going expansion of production (Lee 1995b). This is where the majority of pasture development is occurring. As a result of taro blight (Phytophthora colocasia) in 1993, and the subsequent collapse of the taro production and export subsector, many farmers previously growing taro (Colocasia esculenta) have elected to develop these former taro plantations into pastoral farms. Such plantations tend to be located on high land (over 300 m), in wet environments (more than 4000 mm annual rainfall), and on clay soils of moderate to low natural fertility with flat to moderately steep slopes. They are often in remote areas. 6.1 Improved pasture grass varieties Batiki grass. The principal improved pasture grass variety is batiki grass (Ischaemum aristatum). It is not known when this grass was introduced, but it is assumed that it came from Fiji. This moisture loving plant will grow in virtually all areas except western districts of each island where it tends to form a weak sward incapable of competing with weeds. In all other areas it grows vigorously, establishing quickly from seed or, most commonly, from cuttings. Having a very strong creeping habit, it is highly tolerant of heavy grazing and its dense ground cover smothers invasive weeds. It grows well under coconuts. Batiki is very tolerant of low fertility situations, being able to grow even in very poor highland soils. However, the resultant forage is often severely nutrient deficient. So despite an apparent abundance of feed, cattle will have poor breeding and growth performance, if not given adequate dietary supplements. Animal performance from batiki grass pasture varies with the level of management. Rotational grazing with a short interval of 21 - 28 days is required to maintain young leafy growth. Digestible crude protein percentage in the foliage tends to decrease with time, reaching the minimum threshold for maintenance requirement after about 28 days. Reynolds (1995) stated that annual liveweight gains of around 273 kg/ha could be expected from batiki as compared to 127 kg/ha from unimproved grazing. Aregheore (2001) indicated that there is scant information on the nutritive value of most grass species, inclusive of batiki grass, in Samoa. He suggested that the challenge before ruminant nutritionists and pasture agronomists in using a single grass species as a sole source of forage for animals is to determine whether or not the pasture can supply adequate nutrients for maintenance, growth and production. He also provided mineral composition data on a number of grasses (batiki, guinea and signal). Results from a trial on the nutritive evaluation of batiki grass with other species such as guinea grass (Panicum maximum), and signal grass (Brachiaria decumbens) in Samoa indicated that batiki grass has a comparatively low nutritive value. However,the results of another trial demonstrated that a mixture of 60% batiki grass and 40 % dadap (Erythrina variegata) could satisfy the nutritional requirements of growing goats in terms of voluntary feed intake, growth rate, feed efficiency and apparent nutrient digestibility coefficients (Aregheore 2001). A further trial (Aregheore 2002a) showed that Moringa oleifera at 20 and 50% levels of total daily forage allowance could be used as a cheap protein supplement in batiki grass based diets for goats. Signal grass. The second most popular improved pasture variety is brizantha/signal grass (Brachiaria brizantha). This requires better management and fertility than batiki. It was commonly planted on large plantations such as WSTEC as an open pasture in more fertile areas with a drier north westerly aspect. Signal grass is planted generally by farmers with larger farms and where seasonal drought may be expected. Some seed of Brachiaria decumbens has been imported, but B. brizantha, probably introduced by WSTEC, is more widespread and is vegetatively propagated. Para grass. Brachiaria mutica is a common grass in upland plateau areas. Where cattle are not present, or grazing pressure is light to moderate, the species persists well. However, when fenced and overgrazed (almost invariably), the grass will quickly die out leaving low producing broadleafed weeds. Grasses for drought prone areas. Koronivia grass (Brachiaria humidicola) is the most common drought tolerant improved grass grown. Small areas of Bisset creeping blue grass (Bothriochloa insculpta cv Bisset) have been planted and show promise as drought tolerant pastures for western areas (Lee 1996). Cut and carry feeding is practised by a number of farmers particularly those with pickup trucks. Recently an under-utilized hybrid elephant grass (Pennisetum purpureum) has been promoted and Leucaena KX2 hybrid was imported for cut and carry feeding principally by small dairy farmers (FAO 1998). Other grasses are in the process of being trialled for use by cattle farmers. One of these is splenda setaria (Setaria sphacelata cv splenda). To be useful, new introductions need to perform well in the relatively low fertility soils and withstand competition from very aggressive weeds such as navua sedge (Kyllinga polyphylla). Hetero. Desmodium heterophyllum is the most widely occurring pasture legume. It is probably native to Samoa. It is very adaptable and easy to grow from cuttings. This is the first priority for legume introduction in pastures. It is a low growing perennial creeper which can provide an increase in annual liveweight gain from 220 kg/ha for batiki grass alone to 370 kg/ha for batiki-hetero pasture under good management (Trevor 1998). Rates of nitrogen fixation by hetero of 64 kg N and 110 kg N ha1 year-1 with tall guinea grass and B. miliiformis respectively were recorded in Samoa by Reynolds (1982). Jointvetch. During the 90s, jointvetch varieties (Aeschynomene americana cv. Lee (perennial) and cv. Glenn (annual - weak perennial)) were introduced to Samoa. These legumes have shown good potential in managed grazing systems. They are easy to establish, highly productive (Lee 1996), and grow well in the low fertility soils. Glenn is able to persist due to its heavy seed production. Centro. Centrosema pubescens is naturalised in a number of drier areas of Samoa particularly in north western Uplou and eastern Savaii where it can be found both in unimproved pastures, in improved batiki pastures, and growing on walls where it offers a good source of seed. Shrub legumes. There is very good potential for increased use of shrub legumes. Successful stands have been grown and managed for specific purposes such as feeding weaner cattle. Failures in the past have often been due to the practice of planting shrub legumes as part of the general pasture improvement strategy and use of incorrect grazing practices. This has caused stand failure through overgrazing and overly short grazing intervals. Successfully grown shrub legumes are Calliandra calothyrsus, Leucaena leucocephala cv Cunningham, Leucaena hybrid KX2, and Gliricidia sepium. Aregheore (2002b) and Aregheore and Yahaya (2002) reported on the use of leucaena supplementation with batiki and panicum maximum in goat diets. A practice developed by local farmers is to cut Albizia chinensis bush fallow to 1 m, plant signal or batiki grass, and manage the regrowth as a shrub legume/grass pasture. Some exotic weeds such as guava (Psidium guajava) require chemical treatment to control them. A technique has been developed using a very low volume of non-residual herbicide (triclopyr as the butoxyethyl ester) applied directly to plant stems. However, the overall need for herbicides in plantations has been reduced as easily applied, appropriate management techniques have been developed which control weed incursion by promoting a dominant pasture (Lee 1995b). 6.4 Recent initiatives in forage improvement Much of the early development of pasture-cattle-coconut systems in the South Pacific was concentrated on Western Samoa, where a considerable amount of research was carried out from the late sixties to the late seventies largely by a number of FAO projects (see Reynolds, 1995). More recently the Government of Western Samoa has identified cattle development as an important strategy for import substitution (GWS Development Plan 7). Samoa imports meat to the value of about WST 21 M per year. At the farm level, the choice to develop a cattle enterprise as part of their farm system has been made by many families for various reasons. Some of these are listed below, as ascertained by the author from discussions with farmers and extensionists over a 3 year period.
Ongoing initiatives Field trials are currently being carried out to evaluate diets of batiki grass with different ratios of the leaves and browse of multipurpose trees as a means to improve its nutritional content for grazing and confined animals in Samoa. The browses being evaluated are Leucaena leucocephala, Glyricidia sepium, Calliandra calothyrsus, Erythrina variegata (dadap), and Spondias mombin (vie). These ongoing trials are with goats and steers. The Togitogiga Government beef cattle farm is dominated by batiki grass. At present, the Livestock Division (MAFF&M) has established a shrub legume plot [a feed garden] planted with Leucaena leucocephala and Calliandra calothyrsus at the farm. Animals are allowed to graze in the feed garden at varying intervals in order to supplement the nutrient deficient diet of batiki grass. Other current initiatives by the Livestock Division include the promotion and demonstration of pasture development on fern ( Nephrolepsis hirsutula) infested lands employing low cost techniques and inputs accessible to all smallholders (Tevita, 2001). Aregheore (2000) has stressed the need to better utilize the large quantities of crop residues and agro-industrial by-products generated each year and incorporate them into feed rations. Tevita (1995) reported that a number of useful co-operation projects had contributed significantly to the development of the cattle industry in Samoa.
Future development priorities for the Samoan pastoral sector were also identified by Tevita (1995). These were:
As of April 2001 these priorities remain unchanged (Tevita, 2001) |
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REFERENCES Aregheore, E.M. (2000). Crop residues and agro-industrial by-products in four Pacific Island countries: availability, utilization and potential value in ruminant nutrition. Asian-Aus. J. Anim. Sci. Vol. 13, Supplement (B), 266-269. Aregheore, E.M. (2001). The contribution of pasture to sustainable beef cattle production systems in The South Pacific Region. In: Aregheore, E.M., Umar, M. and Adams, E. (eds) 2001 Sustainable Ruminant Livestock Production in the South Pacific Region. Proceedings of the Regional Workshop held on June 25 - July 2, 2001 at Hotel Peninsula, Suva, Fiji Islands, pp. 29-43. Aregheore, E.M. (2002a). Intake and digestibility of Moringa oleifera - batiki grass mixtures by grazing goats. Small Ruminant Research 46 (1), pp.23-28. Aregheore, E.M. (2002b). Voluntary intake and digestibility of fresh, wilted and dry leucaena (Leucaena leucocephala) at four levels to the basal diet of guinea grass (Panicum maximum). Asian-Australasia J. of Animal Science and Technology 15 (8), pp. 1139-1146. Aregheore, E.M. and Yahaya, M.S. (2002). Effect of fresh leucaena (Leucaena leucocephala) leaf supplementation on the growth of young Anglo-Nubian crossbred goats feeding either batiki (Ischaemum aristatum var. indicum and guinea (Panicum maximum grass. PNG Journal of Agriculture, Forestry and Fisheries, Vol. 45 No. 1-2. FAO (1995). Project document, UNDP FAO Livestock and Pasture Development, Project SAM/95/001, Apia, Western Samoa, January 1995. FAO (1998). Terminal statement (FAO project TCP/SAM/6611) on milk production areas and small milk processing units, FAO Rome 1998. Kear, D. and Wood, B.L. (1959). The Geology and Hydrology of Western Samoa. New Zealand Department of Scientific and Industrial Research, New Zealand Geological Survey, Bulletin 63. 1959. Lee, S.D. (1995a). Achievements of UNDP/FAO Western Samoa Livestock and Pasture Development Project, SAM/95/001. In: Lee S.D. and Macfarlane D.C. (eds), The Status of Forage Based Ruminant Production in the South Pacific. Proceedings of a workshop held in the islands of Upolu and Savaii, Western Samoa, 8-11 December 1995. Lee, S.D. (1995b). Cattle under coconuts, a sustainable improved pasture system for South Pacific island countries. In: Lee S.D. and Macfarlane D.C. (eds), The Status of Forage Based Ruminant Production in the South Pacific. Proceedings of a workshop held in the islands of Upolu and Savaii, Western Samoa, 8-11 December 1995. Lee, S.D. (1996). Guidelines for smallholder dairy farmers in Western Samoa. Consultants report to UNDP - FAO project SAM/86/003, Apia, Samoa. Reynolds, S.G. (1982). Contributions to yield, nitrogen fixation and transfer by local and exotic legumes in tropical grass-legume mixtures in Western Samoa. Trop. Grasslands 16 (2), 76-80. Reynolds, S.G. (1995). Pasture -Cattle - Coconut Systems. FAO RAPA publication 1995/7, Bangkok, Thailand, 668 pp. SPC (2008). SPC releases latest Pacific population data. SPC Website http://www.spc.int/corp/ Stünzner, O. G. (1996). Pregnancy Testing: a Cattle Producers’ Guide to its Practice and Use in Herd Management. Central Queensland University Publishing Unit ISBN 1 875902 04X, 134 p. Stünzner, O.G. (2008). Beef Production and Appropriate Technology in Samoa. Paper presented at the 13th Australasia/Oceania Commonwealth Veterinary Association Regional Meeting and Workshop 17-21 November 2008, Apia, Samoa. Tevita, F. (1995). Country Paper: Western Samoa. In: Lee S.D. and Macfarlane D.C. (eds), The Status of Forage Based Ruminant Production in the South Pacific. Proceedings of a workshop held in the islands of Upolu and Savaii, Western Samoa, 8-11 December 1995. Tevita, F. (2001). Personal communication from Faleupolu Tevita, Assistant Director (Livestock) MAFF&M. Trevor, P. (1998). Personal communication from the farmer, Peter Trevor of Faaala, Savaii. Wright, A. (1963). Soils and Land Use of Western Samoa, New Zealand Department of Scientific and Industrial Research, Soil Bureau - Bulletin 22. 1963. |
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CONTACTS This profile was written and will be updated from time to time by: Stephen Lee
[The original version was edited by H.M Shelton; the revised version drafted in May 2001 was edited by S.G. Reynolds and further revised by S.G. Reynolds in May 2006 and January 2009]. |