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Evaluation of alternative selection objectives and schemes for optimisation of village goat improvement programs
2012
Bett, R.C. | Okeyo Mwai, Ally | Kosgey, I.S. | Kahi, A.K. | Peters, Kurt J.
his study evaluated alternative breeding objectives and schemes for crossbred goats in a village/ community breeding program. A single-tier breeding structure was assumed in the optimisation of this breeding program. Considered were two selection schemes; within-group (WG) and across-groups (AG), and three alternative selection objectives; ALT I- defined based on relative weights (RWs) derived from producers’ preferences, ALT II- based on economic values (EVs) without risk and ALT III- based on risk-rated EVs, at different intensities of buck selection (proportion of bucks selected, P = 0.02 and 0.04) and selection criteria (mass and BLUP). The genetic gains (ΔG) in the breeding-objective traits, aggregate responses (RH), total economic response (TER) and the rate of inbreeding (ΔF) per generation varied depending on the scenarios ALT I, II and III, P and the selection criteria. A selection index considering ALT III (Risk-rated EVs) in derivation of ΔG for individual traits, RH and TER, and ΔF would be appropriate and optimal in both WG and AG selection schemes. However, these responses were higher in the AG scheme compared to the WG selection scheme, and the ΔF more favourable with increase in the number of groups co-operating. Responses under mass selection were also comparable to BLUP with the same rate of inbreeding, restricted to an acceptable level of 0.01. These imply that an AG selection scheme under mass selection would be optimal and logical for implementation in the smallholder low-input goat production systems. However, a minimum of 14 co-operating farmer groups would be required to produce considerable levels of responses and at acceptable levels of inbreeding.
Afficher plus [+] Moins [-]Breed preference and breeding practices for goats in agro-pastoral communities of semi-arid and sub-humid areas in Tanzania
2014
Chenyambuga, S.W. | Lekule, F.P.
A study was carried out to determine farmers’ preferences for goat breeds, desired traits, management and breeding practices in agro-pastoral communities of central and eastern Tanzania. A total of 552 goat keepers from semi-arid and sub-humid areas were involved. Information on goat flock size, breed preferences, breeding practices, traits preferred and husbandry practices was collected using a well structured questionnaire. Out of the 552 household heads, only 21.3% were women. Most of the farmers kept indigenous goats belonging to the Small East African breed and the mean number of goats per household was 8.9 ± 1.0. The majority of the farmers (53.4%) preferred to keep the Small East African goat breed rather than the exotic breeds. The Small East African breed was preferred to exotic breeds because the animals are easier to feed, prolific, tolerant to drought and endemic diseases. Most farmers (70.8%) practiced uncontrolled mating using bucks from either their own flock (66.7%) or neighbours’ flocks (33.3%).Uncontrolled mating was preferred because it is easier to practice (41.2%) and cheaper (41.2%). The buck to doe ratio was 1:3 in semi-arid and 1:2 in sub-humid areas. Breeding males were selected based on body size by the majority (85%) of the goat farmers. It is concluded that livestock keepers in semi-arid and sub-humid areas in Tanzania prefer the Small East Africa goats because the animals are abundantly available and well adapted to the local environmental conditions.
Afficher plus [+] Moins [-]A review of productive and reproductive characteristics of indigenous goats in Ethiopia
2015
Dereje, T. | Mengistu, U. | Getachew, A. | Yoseph, M.
Goat production in Ethiopia contributes significantly to national export earnings and the livelihoods of rural households. In the past, a number of research works were conducted to evaluate and improve the performance of indigenous goats. However, systematically compiled information is not available concerning the level of performance of indigenous goats in the country. In this paper, level of performance for major economic traits of indigenous goats is reviewed and discussed. It is apparent from the information presented in this review that the performance of indigenous goat breeds of Ethiopia is highly variable between different management systems. Many of the research reports show that age at first kidding and kidding intervals appear to be shorter in the traditional systems while reproductive efficiency in terms of growth rate, carcass yield, milk yield, litter sizes and survival rate are higher under improved management systems. In terms of body weight and growth rate, lowland goats are not better than those in the other agro-ecologies. Though productivity of indigenous goats is generally considered as low, there is high potential among the indigenous Ethiopian goat breeds under improved management systems. They also produce skins suitable for production of high quality leather products.
Afficher plus [+] Moins [-]Breeding scheme based on community-based participatory analysis of local breeding practices, objectives and constraints for goats around Dire Dawa, Ethiopia
2013
Gebreyesus, G. | Haile, Aynalem | Dessie, Tadelle
This study was conducted in the rural kebeles around Dire Dawa for designing a simple, yet, feasible breeding scheme in the context of community-based management of animal genetic resources. Range of participatory rural appraisal tools, including focal group discussions and participatory mappings, were employed to study the local community’s Indigenous knowledge and practices in managing the goat gene pool. The breeding objective and local trait preferences were defined in a participatory manner through own-flock ranking experiments. The community generally practices selective pure breeding where by the own flock and flocks in the neighbourhood were the units of selection for bucks. There are social regulations in the community against sale of breeding does outside the community while encouraging communal use of outstanding breeding males. Goats are kept for multifaceted purposes ranging from products like milk, meat and live-sale to functions in socio-cultural, financial and ritual state of affairs. The breeding objective is to ensure improved milk production, through increased daily yield per doe and increased fertility per flock, and increased net income per flock, through increased number of marketable animals. Traditional criteria such as conformation, behaviour and adaptation were as important as most “production” traits in selecting breeding animals. The breeding goal traits considered were, accordingly, milk production, conformation and reproductive traits. Based on these findings, village breeding schemes, where-by flocks and breeding groups in a village are taken as focal points, is recommended as way forward in genetic improvement. The framework for a feasible implementation of such genetic improvement scheme is outlined based on the rationale of utilizing available social regulations, indigenous knowledge and traditional systems of breeding as well as future market prospects.
Afficher plus [+] Moins [-]Growth performance of Woyto-Guji and Central Highland goat breeds under traditional management system in Ethiopia
2016
Zergaw, N. | Dessie, Tadelle | Kebede, K.
The study was conducted to evaluate the productive and reproductive performance of Central Highland and Woyto-Guji goat breeds in Meta-Robi and Konso districts, respectively. A total of 240 farmers were interviewed using semi-structured questionnaires to describe kidding pattern, kidding interval, weaning age and milk production. On-farm performance traits were recorded on 730 goats of 157 households. In Konso, majority of kidding occurred in May, whereas in Meta-Robi it was in September. There was a difference in the average kidding interval and age at weaning between the breeds. Kids birth weight (2.03 Vs. 2.68kg) and does postpartum weight (26.6 Vs. 28.2kg) were lower in Woyto-Guji goats than in Central Highland goats. Average 90 day kids' weight and average daily weight gain between birth and 90 days were not different among the breeds. Average 180 day weight (15.7 Vs. 11.5kg) and average daily weight gain between 91 and 180 days (65.4 Vs. 31.9 g/day) were better in Central Highland goats than in Woyto-Guji goats.
Afficher plus [+] Moins [-]Performance evaluation of Abergelle goat under community based breeding program in selected districts, northern Ethiopia
2018
Birhanie, Minister | Alemayehu, Kefyalew | Mekuriaw, Getinet
Milk production performance of Begait goat under semi intensive and extensive management in Western Tigray, North Ethiopia
2018
Hagos, A. | Gizaw, Solomon | Urge, Mengistu
The study was conducted in Kafta humera district of Ethiopia, (i) to investigate the milk yield of Begait goat under different management and (ii) to evaluate the effects of different non-genetic factors on lactation performance. Data were collected from 428 lactating does under two managements (semi intensive and extensive) during October 2014 and March 2016. Statistical analyses were carried out using the GLM procedure of SAS version of 9.2 software. The least squares means (with standard error) for daily milk yield, lactation milk yield and lactation length were observed to be 0.75±0.01 kg, 85.6±1.04 kg and 111±1.21 days under semi intensive management, respectively whereas under extensive management these were found as 0.55±0.01 kg, 56±1.43 kg and 101±1.57 days, respectively. The results of this study indicated that management system, parity number and season of birth affected all variables highly significantly.
Afficher plus [+] Moins [-]Participatory definition of trait preference and pastorals’ indigenous knowledge on goat breeding strategy around Aysaita district, Ethiopia
2015
Misbah, F. | Belay, B. | Haile, Aynalem
Comapison of carcass characteristics of Boran and Arsi-Bale goats under different durations of feedlot management
2005
Hailu D. | Tatek W. | Tesfaye L.
The objective of this study was to assess the carcass characteristics of two goat breed types under different durations of feedlot management. Forty eight yearling intact male Borana (n=24) and Arsi-Bale (n=24) goats were used in a 2 x 3 factorial arrangement, the factors being breed-type (Borana and Arsi-bale) and feeding days (90, 120 and 150). The goats were slaughtered after 18 hours fasting to evaluate the various carcass traits. The carcasses were separated into leg, lion, rack, shoulder and neck and breast and shank primal cuts. The Borana goats possessed heavier live weight, empty body weight, carcass weight and length than the Arsi-Bale goats in the feedlot environment. Dressing percentage varied from 41.0 to 45.9% for both goat breed types. Borana had greater rib eye area than Arsi-Bale goats for 120 (42.9±3.99) and 150 (47.3±1.28) feeding days. Back fat thickness was higher for both breed-types for 150 days feedlot feeding. The highest bone proportion was 30.9% for Arsi-Bale goats while the lowest was 25.7% for Borana goats. The percentage of rack fat of Borana was higher than for the Arsi-Bale goats.
Afficher plus [+] Moins [-]Participatory characterization of the Short-eared Somali goat and its production environment around Dire Dawa, Ethiopia
2012
Gebreyesus, G. | Haile, Aynalem | Dessie, Tadelle
Characterization of the Short-eared Somali goat population around Dire Dawa, Ethiopia, was undertaken in a community-based and participatory approach. Range of participatory tools, including Focal Group Discussions, participatory mappings and transect walks, were employed to study the local community's Indigenous knowledge and practices in animal breeding. The breeding objective was defined in a participatory manner through own-flock ranking experiments. Physical description of the goat population was made based on the "key characteristics" concept used by the community to distinguish their goat type among other breeds within their migratory reach. The Issa community maintains a perception of special association towards the Short-eared Somali goat type, claiming a historic role in its development and adaptation. Local myths persistent in the community associate the origin of the Short-eared Somali goat breed with the communal ethno-history. The community generally practices selective pure breeding employing rather complex indigenous knowledge and traditional practices aimed at polishing the gene pool towards the dictates of the environment. Patchy color patterns were generally dominant (59.8%) in the goat population, while 34% of the patched goats had a unique pattern of black spots on the center core of the face and a black stripe across the spine. Goats were kept for multifaceted purposes ranging from products like milk and meat to functions in socio-cultural and financial state of affairs. The production system was characterized with lack of feed supplementation and rangelands provide the only source of feed throughout the year. Although the production environment was characterized with recurrent droughts and high prevalence of goat diseases, goats were found to have significant contributions to the livelihood of the Issa pastoralists in the study area.
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