22/01/2024
Small Ruminants Production ( Sheep and goats)
In Nigeria, small ruminants contribute an estimated 35% to the total meat supply; they are more important in the north than in the south, and more important in rural than in urban areas. Population estimates suggest there are roughly 1 million head of sheep and 7 million goats in the subhumid zone of Nigeria. In livestock units, this represents 3% and 16% respectively of total ruminants in the zone. Generally in Nigeria there is estimated population of 7.2 to 8.2 million sheep and 22 million goats
Breed
The major breed of sheep is the Yankasa; the West African Dwarf is the major goat breed. the Red Sokoto goat can be observed frequently in urban areas as far south as Ilorin. Again, crossbreeding is common, particularly in the northern part of the zone, where Red Sokoto goats are found not only in cities but also in rural areas.
Management
Sheep are kept predominantly by pastoralists, who manage them fairly extensively. Goats are kept mainly by crop farmers, whose management practices include housing overnight and tethering by day during the wet season, some cut-and-carry feeding shortly before harvesting their food grain crops, and allowing them to roam freely in the dry season.
In sheep flocks managed extensively, fertility of ewes (female sheep) is high almost 100%, twinning rate is 12%, and lamb mortality up to 3 months is 25%.
Based on limited weight data, a productivity index has been calculated of 0.327 kg lamb/kg ewe per year, assuming a weaning age of 90 days, and 0.490 kg for an assumed 180-day weaning age. The major problems in sheep keeping are a high rate of adult mortality, liver fluke infections, and lameness during the wet season.
In goat flocks kept by farmers, twins and triplets account for almost 40% of total births, but overall fertility is low (below 100%). Low fertility maybe as a result of management system employed. Mortality rates are low: 22% for kids and 14.4% for adults. Calculations of productivity indices for 90 and 180 days weaning age are 0.259 kg and 0.437 kg kid/kg doe respectively. Low fertility and weight losses during the second half of the wet season are the major problems in goat keeping.
Profitability
The importance of small ruminants for meat production in the tropics is well recognized. More than 11% of the meat supplied from slaughter-houses in Nigeria comes from sheep, and would be greater if rural unregistered slaughters are taken into account. While goats contribute about 20% of Nigerian meat supply. This means that about 35% of total meat supply comes from small ruminants. Nevertheless, large differences exist between regions as well as between the countryside and city. In rural areas of northern Nigeria the contribution of small ruminant meat to total meat consumed is three times that of beef; but in the cities small ruminants contribute only a quarter as much as cattle to total meat consumption. In the rural areas of southern Nigeria, beef and small ruminant meat are equally important, whereas in urban areas beef consumption is more than eight times as great as the consumption of small ruminant meat. The numerical ratio between sheep and goats in Nigeria would thus be 1 to 3. This ratio contrasts with neighbouring countries such as Ghana, Togo and Ivory Coast, where sheep slightly outnumber goats.
Nutrition
Sheep tend to lose weight much less than cattle during the dry season in the subhumid zone, and goats are even less susceptible to weight losses than sheep. One reason for these differences may be that small ruminants select a diet of better quality from natural fodder resources than cattle do. Sheep are basically grazers, whereas goats eat a substantial amount of browse plants. Variations in the nutritional quality of browse plants from region to region may lead to differences in weight. There is evidence that goats may be able to digest low-quality forage better than either cattle or sheep. Nevertheless, the superiority of goats and sheep over cattle in diet selection capacities is undisputed.
Fertility
Generally, sheep and goats mature early. The age of sheep at first oestrus is 5 to 8 months for the West African Dwarf breed, 7 to 9 months for Yankasa and about 9.5 months for Uda. Age at first parturition varies considerably. In West African Dwarf sheep, it occurs between 11 and 37 months , in Mali 50% of the ewes had lambed by 15 months and the mean lambing interval of sheep was found to be 253 days, resulting in 1.4 births per ewe per year.
Since multiple births are common among small ruminants(sheep and goats), the number of lambs born per ewe per year (or kids born per doe) is higher than the lambing or kidding percentages reflect. Fertility shows number of parturitions per dam per year, while fecundity is the number of offspring born per dam per year. In Ivory Coast, it was found that fertility was 160% and fecundity 170%. Kidding intervals (for goats) are generally found to be similar to lambing intervals(for sheep); age at first kidding also differs little from age at first lambing.
Generally, three parturitions in 2 years is considered the maximum in both sheep and goats in Nigeria. The average twinning rate is usually greater in goats than in sheep with goats showing 32.9% of the births be single, 52.9% twins, 13.7% triplets, and 0.3% quadruplets, resulting in 260% fecundity. According to research, both species are highly fertile, but the fecundity of goats is normally superior to that of sheep, largely as a result of greater twinning rates.
Mortality
The survival rate of sheep up to 6 months of age was 70% in Mali and 75% in Kenya. The corresponding figures for goats are 65% in Mali and 78% in Sudan, indicating comparable mortality levels for kids and lambs. In the humid zone of Nigeria, preweaning mortality is around 15% or more. Major factors influencing preweaning mortality within a breed are birth weight, litter size and parturition number.
In Mali it was found that parturition intervals of 183 days or less resulted in a lamb and kid mortality of more than 50%, whereas mortality declined to 25% when the interval was 245 days or more. Age of dam at first service also influences mortality of young animals.
There is around 15% adult annual mortality for sheep and goats in southern Nigeria, and an overall mortality of approximately 30% for sheep and goats in the semi-arid region of Sudan.
The major cause of mortality in sheep and goats is attributed to diseases some of which can be prevented or controlled.
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