Mobility and livestock mortality in communally used pastoral areas: the impact of the 2005-2006 drought on livestock mortality in Maasailand
© Nkedianye et al; licensee Springer. 2011
Received: 16 February 2011
Accepted: 20 October 2011
Published: 20 October 2011
There is consensus that pastoral mobility is beneficial for both pastoralists and the environment. However, rapid change arising from multiple factors, including landscape fragmentation, sedentarization, and demographic drivers might affect the effectiveness of this pastoral coping strategy in times of drought. We investigate livestock mortality rates following the 2005 drought in four areas in Maasailand: the Maasai Mara, the Kitengela plains, the Amboseli, and the Simanjiro plains. The main aim was to assess the mortality of resident livestock in relation to incoming livestock during the drought. Contrary to our expectations, livestock mortality rates were significantly higher (43%) in Kitengela, which experienced above-average rainfall, compared to the other three areas which had below-average rainfall yet experienced mortality rates between 14% and 30%. Two processes might explain this surprisingly high mortality rate. Firstly, the immigration of large numbers of livestock from drought-stricken areas into the highly fragmented Kitengela area increased stocking density, which worsened the shortage of forage and water. Secondly, the more market-oriented but less drought-resistant livestock breeds in Kitengela form another explanation for the increased mortality. These observations suggest that pastoral mobility may lead to greater sensitivity to drought especially in fragmented areas where more market-oriented but less drought-resistant livestock breeds are introduced. We argue that in such areas, there is a crucial need to adopt practices that simultaneously minimize land fragmentation and enhance pastoral mobility and access to information on improved livestock breeds and markets.
Keywordsdrought East Africa mobility livestock mortality improved breeds fragmentation
Pastoral livestock production, the dominant land use in the arid and semi-arid lands of Africa, provides a livelihood to millions of people. Traditionally, pastoral societies have been relatively wealthy and even today the livelihoods of pastoralists tend to compare well with others in years of good rainfall. The arid lands of Africa experience frequently recurring droughts; however, these have significant effects on livestock and pastoral livelihoods alike (Zamani et al. 2006; Le Houerou 1996; Oba and Lusigi 1987).
Pastoral societies were considered resilient to drought as they traditionally recovered during years of better rainfall. Recently, this perception of pastoral resilience is under increasing scrutiny as social, economic, and environmental factors exert more pressure in these systems. In some areas, such as the horn of Africa, sequences of recurring droughts push pastoralists out of livestock and into poverty and food aid dependency (Fratkin 2001; Campbell 1999; Spencer 1974).
What caused this weakening of pastoral resilience? Traditionally, a number of strategies were used to prevent or alleviate the effects of drought. Firstly, pastoralists maintained large herds to ensure that sufficient animals would survive to rebuild the herds after the drought (McPeak 2005). In many areas, the resilience provided by large herds has been greatly eroded because, due to demographic growth, per capita herd size has reduced (Lamprey and Reid 2004; Sindiga 1984), hence increasing vulnerability to drought. The loss of pastoral lands, which were used as drought refuges to agriculture, conservation (Homewood et al. 2009; Brockington 2005; McCabe 2003) and urbanization (Behnke 2008), and sedentarization from a formerly semi-nomadic lifestyle and the associated land fragmentation and intensification of land use further reduced resilience. Secondly, pastoralists reduce risk while spreading their animals over herds of relatives and maintain social institutions to support those affected by drought. These strategies are, however, under increasing pressure due to weakening of the social networks which once supported them.
Pastoral mobility is probably the oldest described drought coping strategy, as in Genesis 47:3-4 (The Bible 2009) where the Israelites explain their migration into Egypt before the Pharaoh as follows: "We have come to live here awhile, because the famine is severe in Canaan and your servants' flocks have no pasture. So now, please let your servants settle in Goshen." During the colonial period in East Africa at the beginning of the twentieth century, the idea that mobility has benefits gained support when the colonial administration in Kenya and Tanzania tried to disrupt pastoral mobility (Borjeson et al. 2008; Hughes 2006; Hodgson 2001; Rutten 1992).
Today, there is consensus regarding the social benefits of pastoral mobility, and the "blessings of pastoral mobility hypothesis" has thus attained the status of a paradigm. Although it is doubtless that mobility has been and will continue being helpful to pastoralists, the paradigm is mainly built, on a mixture of deductive argument and positive experiences from the past.
One problem of the blessings of pastoral mobility paradigm is that it does not highlight the costs of mobility, especially to resident communities. It is obvious that herdsmen, when confronted with drought, may benefit while moving their livestock to greener areas to reduce the mortality of their herd. The paradigm does not consider the negative social impacts for those inhabiting the lands receiving the hungry herds. That was probably also irrelevant in biblical times, as there was sufficient space. Similarly, following the rinderpest epidemic and depopulation in the 1890s (Rutten 1992; Talbot 1972) there must have been ample space in the rangelands in the Maasailand of the early twentieth century. Hence, competition with resident herds was unlikely at that time.
The situation is different today. In Maasailand, there is no more "no man's land" and little if any underutilized land. Today, pastoral mobility as a strategy to escape drought, means moving into lands utilized by others and often to far-flung areas. Such protracted movements and immigration into commonly used lands increases competition for forage and water resources (Hardin 1968) and the risk of contracting diseases, a situation that will affect the body condition of resident and immigrant livestock alike. Thus far, there has been no study addressing the benefits of pastoral mobility under conditions of intensifying utilization of rangeland resources.
In this study, we investigated mortality rates recorded during the 2005-2006 drought among 396 households in four areas of East African Maasailand. Three out of the four areas experienced below-average rainfall while the fourth had above-average rainfall. Pastoral mobility resulted in a significant influx of livestock in the latter site, but not in the first three sites. This contrast between the four sites enabled us to compare mortality rates among drought-affected and non-drought-affected sites, in the expectation that the non-drought-affected site would reveal lower mortality rates.
Materials and methods
Characterization of the four study sites
Land cover (%)
Amboseli (8,400 km2)
Group ranches. Private
Livestock, wildlife, agriculture and horticulture
G, 34; S, 5; WB, 60; W, 1
Kitengela (390 km2)
Privately owned, subdivided from 1986
Livestock, wildlife, agriculture and horticulture
G, 91; S, 7; WB, 1; urban areas, 1
Maasai Mara (6,500 km2)
Privately owned, subdivided from 2000
Livestock, wildlife, little agriculture
Grassland, 60; S, 34; WB, 6
Government owned, village control
Livestock, wildlife, expanding agriculture
G, 62; WB, 28; C, 10
Description of the main livestock breeds in the four study areas
Blackhead Somali, Red Maasai
Mixed: Galla, Small E. African
Boran, Sahiwal crosses, Maasai Zebu
Dorper, mixed Dorper × Red Maasai
Mixed: Galla, Small E.African
Mixed: Small E. African, Maasai
Red Maasai, Blackhead Somali
Mixed: Small E. African, Maasai
Livestock mortality survey
Livestock mortality surveys were conducted by locally recruited enumerators in one hundred randomly selected households per study site during the 3 months (May to July 2006) immediately after the drought of March-April 2006. These multi-site simultaneous surveys are rarely done but were possible to conduct because the senior author of the paper and the enumerators were all native Maa-language speakers. The enumerators, who all had an "ordinary level" certificate in formal education and prior surveying experience, were thoroughly trained before the survey. Livestock losses were recorded by livestock species by household and per site. Livestock numbers were converted into Tropical Livestock Units (TLU) by multiplying total numbers of cattle by 0.72 kg, while sheep and goats (shoats) numbers were multiplied by 0.17 kg (Radeny et al. 2007). A global positioning system (GPS) was used to fix the location of the homesteads.
We analyzed the variation in the proportion of livestock that died across the four sites during the drought of 2005-2006, and compared the results across the four sites to establish the effects of drought on livestock mortality. The analysis was performed at an aggregated livestock (cattle, sheep, and goats) level expressed in TLU, as well as for the three species separately.
Where w i, j and x i, j represent the weight and herd size (in TLU) for the j th household at the i th site, respectively, and the average herd size at the i th site.
Financial loss caused by drought
Livestock mortality in percentage, and the estimated loss in monetary value by livestock species
Average Ksh per household
US$ per household
Narrative of the condition of the rangelands and the movements of resident and immigrant herds
Average long rains
First immigrant herds arriving from drought-stricken areas of Sultan Hamud and Mashuru in the South-east
Good short rains
Above-average long rains, good productivity of rangelands
More immigrant livestock arriving, stocking density at least twice the normal
All grass depleted
Failure of short rains, severe competition between resident and immigrant herds
Start of mortality, first among immigrant followed by resident herds
Peak mortality for all livestock
Onset of the rains, continued mortality of weakened livestock due to pneumonia and other diseases
Figure 2 describes the variation in standardized annual rainfall for the 47-year period during 1961-2007. The figure reveals that Kitengela received above-average rainfall in 2005, while rainfall in Amboseli, Simanjiro, and the Mara was below average. Hence from a meteorological perspective, three areas experienced a drought, while Kitengela did not. The figure, furthermore, reveals that Amboseli, Simanjiro, and the Mara also experienced drought in 2004, while Kitengela had close to normal rainfall.
There was a significant difference in mortality rates between the four sites (weighted ANOVA; F3,390 = 40.91; P < 0.001). A pair-wise multiple comparison adjusted for multiplicity using the Bonferoni correction revealed that all sites differed from each other (All P s < 0.001). However, the difference between Amboseli and the Mara was insignificant (P = 0.751). Surprisingly, Kitengela incurred the highest overall livestock mortality rate of 43%. The Amboseli, Mara, and Simanjiro had mortality rates of 30%, 26%, and 14%, respectively.
During the interviews with herdsmen, we noted large numbers of immigrant livestock in the Kitengela plains in 2004-2005. These herds arrived from mid-2004 onwards, following failure of the long and short rains in Mashuuru and Sultan Hamud to the south-east of Kitengela (Table 4 and Figure 1). Most of the immigrant herds disappeared in the middle of 2005 after they had depleted the forage produced during the above-average long rains earlier that year. In the other three areas, there was internal migration, but no immigration of livestock.
Finally, there were marked differences in breeds raised in the four areas (Table 2). Traditional breeds prevailed in the Mara, Amboseli, and Simanjiro, while crossbreeds were prevalent in the Kitengela plains.
Comparison of livestock mortality rates reported in this study with those reported for earlier droughts
Combined TLU (%)
UNEP and GoK
Kaputiei North and Central
Samburu; Northern Kenya
Our data revealed a negative relation for three out of the four sites. The regression line in Figure 3 fitted through these three data points entered, when extrapolated to average or above normal rainfall conditions, the mortality zone which corresponds to non-drought years. However, the Kitengela plains, in spite of receiving normal to above normal rainfall, and contrary to expectation, had a much higher herd mortality rate of 43% (Figure 3). These surprising results indicate that differences in rainfall alone do not explain the variation in herd mortality between the sites.
There are two principal factors that might explain the unexpected high overall mortality in the Kitengela area. Firstly, as already explained, in 2004 large numbers of livestock migrated into Kitengela from the south-east (Kifugo et al. 2009; Mworia and Kinyamario 2008). This inward migration was caused by a pronounced lack of rainfall in the south-eastern rangelands (Figure 1). Knowing the Kitengela as a reliable drought refuge, and hearing that the Kitengela plains had received relatively good rains, pastoralists from as far as Mashuuru and Sultan Hamud (see Figure 1) drove their herds up north in anticipation of greener pastures. Such migration of livestock towards the wetter Kitengela plains has been common during past droughts (Njoka 1979; Casebeer and Mbai 1974).
This migration from the south increased stocking density in the Kitengela plains. We did not record the numbers of immigrant livestock, but based on our frequent visits and discussions with herdsmen and livestock owners, we estimated that stocking density was more than doubled. This high stocking density must have led to heightened competition for forage, as there was little left by the end of July 2005, which is abnormal in Kitengela during a normal rainfall year as was the case in 2005. We suggest that this shortage of forage and water brought about by immigrant livestock induced the high starvation of the resident livestock. In addition, the fragmentation and inaccessibility of previously available pastureland in the Kitengela plains and year-round heavy grazing by livestock due to sedentarization probably also contributed to the higher mortality.
Secondly, the particular breeds in the Kitengela plains might form an additional explanation for the higher mortality rates. The Kitengela pastoralists have responded to the demand for meat and milk from nearby the Nairobi city by selecting high-yielding animal breeds. However, high-yielding cattle (Boran and Sahiwal crossbreeds) and sheep (mainly Dorper) breeds (Table 2) are less drought resistant (Degen et al. 2001).
Are there any other contrasts between Kitengela and the three other areas that might explain the differences in mortality rates? Due to its proximity to Nairobi, the human population pressure has resulted in a continuous influx of people, growing land use changes, and fragmentation of lands. Since the 1990s pastoral lands have increasingly been fenced and converted to other land uses, thus restricting the mobility of wildlife and livestock (Reid et al. 2008; Kimani and Pickard 1998; Rutten 1992). Unpublished ILRI maps (Kifugo et al. 2009) reveal that by 2004, 16% of the Kitengela plains were inaccessible to mobile livestock because of fences. Longer grazing orbits imposed by the fences could have contributed to mortality by increasing energy demands, hence fencing likely amplified the higher mortality rates.
Hence, we attribute the unexpectedly higher livestock mortality in Kitengela to the prevalence of crossbred livestock and shortage of forage, which was not caused by drought in the Kitengela plains but by the influx of livestock responding to drought elsewhere. We postulate that the immigration of animals from drought-stricken areas to the south caused a forage and water shortage leading to the otherwise unexpected higher mortality rates in Kitengela. In addition, the crossbred livestock in Kitengela were likely more vulnerable to forage loss and diseases. This explanation, which appears plausible given the available evidence, questions the widely held opinion that pastoral mobility is positive because it enables pastoralists to sustain their herds, by migrating to areas that received more rainfall.
Nevertheless, the general view that pastoral mobility is a coping mechanism that allows pastoralists to preserve their animals may be true now as in the past. However, in the past, rangelands were underutilized and competition for forage resources less intense. In recent times, competition for resources is intensifying as demographic and other pressures as well as fragmentation and intensification of land use due to sedentarization progressively exclude pastoral livestock from their historical dry-season refuges. Our observations in Kitengela indicate that generalizations based on past experience may no longer be sufficient. During this particular drought, the immigration of animals from outside contributed to the mortality of the resident livestock. The influx of livestock into the Kitengela plains and the higher mortality consequently caused significant financial losses to the resident pastoral households in Kitengela (Table 3).
The argument in favour of pastoral mobility is that it is good for those who migrate from drought-stricken pastures to areas with more rainfall. Since these movements are often reciprocal, those receiving such herds also benefit in the future. We did not record mortality among the immigrant herds entering the Kitengela in 2005. We assume though, that the mortality rate among these herds must have been high as well, for the following reasons. Firstly, it is likely that by the time the decision was taken to move to Kitengela, the herds coming from outside were already in a worse condition than the resident livestock. Secondly, covering the long distance to Kitengela must have further worsened their condition. Hence, by the time they arrived in Kitengela, the conditions of the immigrant livestock must have been poorer than those of the resident livestock. We therefore suggest that the immigrant livestock may well have suffered similar or higher mortality than the resident livestock population. We caution, however, that this one-off experience may not suffice to water down the benefits of mobility in coping with spatial and temporal variability in rainfall, hence additional analyses would be required to evaluate the robustness and generality of our inference.
The relevant question in the context of the mobility benefit hypothesis is however whether mortality among the immigrant herds would have been lower if they would have stayed in their area of origin. Our data does not allow us to address that question. The recollection of our impressions during the surveys in the Kitengela is that immigrant livestock was in a worse condition and died in larger numbers.
Our observed livestock mortality rates thus suggest that pastoral mobility during this particular drought had negative impacts on the livelihoods of the resident pastoral households. The above arguments, furthermore, suggest that mobility may not have brought the herdsmen from outside what they had expected to find in Kitengela-a refuge to enable their livestock overcome the drought. However, from the immigrant point of view, the movement into Kitengela was a rational "honey-pot" effect-driven decision, that was definitely harmful for the resident population during that drought. In the end, for the immigrant households the movement into Kitengela complicated the situation by postponing death of their livestock, while leading them into a deathtrap.
Our analysis suggests that pastoral mobility may no longer be a panacea, especially for resident populations mainly composed of improved breeds and in fragmented and settled areas. An important question is whether the situation described here is generic and likely to be valid for many places and many droughts. We consider that events similar to those described for the Kitengela area will occur, in particular when drought affects all but a few isolated areas. In such cases pastoralists move to places at higher elevation, like the Kitengela plains, which on average, receives higher rainfall than the lands to its south. The Mara, Amboseli, and Simanjiro areas also have similar higher elevation drought reserves, parts of which have been converted to agriculture, but which functioned historically as important drought refuges. Under these circumstances, mobility will tend to concentrate animals towards small spots of green pasture. These may become "graveyards" rather than refuges when abnormally high numbers of animals compete for the limited resources.
Mobility is likely to be more beneficial when drought is restricted to smaller pockets surrounded by larger areas of adequate pasture. We suggest that under the current situation of intensive range utilization, the benefits of pastoral mobility depend on the intensity of the competition between resident and immigrant livestock that depends, in turn, on the relative availability of productive versus drought-stricken rangeland. The higher the ratio, the lower the concentration of livestock and the more likely that pastoral mobility will be beneficial, at least for the immigrants.
The introduction of high-yielding breeds in areas open to pastoral mobility poses a significant dilemma to pastoralists. Higher-yielding breeds and crossbreeds are attractive as they increase revenue from sales (Radeny et al. 2007; Degen et al. 2001). Yet, the downside is an increased vulnerability under stressful and low management conditions where forage is inadequate (Baker 1997). Our results and arguments above suggest that the more sensitive high-yielding breeds might suffer more from immigrant livestock depleting the forage resources, which they require to get through a drought. We question whether with these experiences pastoralists will continue to prefer higher-yielding breeds in areas of communal access. We argue that unless these livestock keepers can access relevant and timely information on these breeds, the costs of raising them may outweigh the benefits, especially in times of pasture scarcity and given the trend towards increasing frequency and severity of droughts.
The pattern described in this paper is not unique to the 2005-2006 drought and the Kitengela region. Essentially, the same story repeated itself in Kajiado during the drought of 2009 http://www.nation.co.ke/News/-/1056/661984/-/item/0/-/5sed4fz/-/index.htm, with even more catastrophic outcome. Thus, the only key difference was that the herd mortality rates among immigrant livestock and the social impacts, which we will describe in a sequel to this paper, have been much more extreme as the drought was the worst recorded in the past 40 years (Western 2009); http://www.nation.co.ke/magazines/artandculture/-/1222/1222/-/to1b2g/-/index.html). Together, these findings suggest that it is time to highlight the benefits of providing relevant and timely information to support sustainable rearing of improved breeds in areas of common pool resources. Finally, policies that discourage land fragmentation and intensification of land use in pastoral rangelands should be prioritized to promote the resilience of pastoral livestock production systems to recurrent climatic extremes linked to global climate warming.
The data for this paper were collected with support from the Belgian-funded DGIC grant through the Reto-o-Reto project at the International Livestock Research Institute (ILRI). Fieldwork support from Moses Ole Nesselle and Leonard Onetu is highly appreciated. Thanks also to Jane Gitau and other members of the PLE-2 team for comments and suggestions that helped improve earlier drafts of this paper.
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