Open Nucleus Breeding Strategy for Fogera Cattle Breed in Ethiopia: Achievements and Lessons Learnt

Fogera cattle are one of the promising indigenous milk type local breed of Ethiopia. The objective of this paper was to evaluate the performance of Fogera breed under open nucleus breeding scheme. The work was done in two purposively selected districts (Gondar Zuria and Fogera) with community-based breed productivity improvement (CBBPI) as an approach. The collected data was analysed by GLM procedure of SAS for xed factors estimation. Genetic parameters estimate was made by ASREML software for heritability and correlation. The overall milk yield of the nucleus herd was 2.26 ± 0.794 litter. From the total herd, best 10% and 25% of them give a respective milk yield of 3.31 and 2.87 litter; and some elite cows give an average of 5.45 ± 0.73 litter with a maximum yield of eight litters per day. The overall birth and weaning weight of nucleus herd calves was 21.30 ± 0.06 and 103.66 ± 0.59kg, respectively. Heritability for birth and weaning weight was 0.24 ± 0.09 and 0.18 ± 0.05, respectively. The phenotypic and genotypic correlation with their respective standard error between birth and weaning weight was 0.0613 ± 0.0075 and 0.0712 ± 0.0343, respectively. For CBBPI program, 17 pure Fogera bulls were distributed to the two districts. The birth and weaning weight of the village calves was 23.77 ± 0.21 and 85.89 ± 1.07, respectively. Through the program, above 1000 households were beneting through the breeding program, health, forage development and grazing land management. To share the achievements of the results in CBBPI program, popularization through led days and innovation platforms; and documentation of each step via publications, videos and pictures was done. From the result, it can be concluded that the strategy implemented for the breed conservation “open nucleus breeding scheme” had shown progressive results and improvement was recorded. To widen the result and improve the livelihood of the farmer, scaling up of the activity should better be planned with stakeholders.


Introduction
Cattle are central to culture and to life in Africa. The African cattle breeds that exist today comprise a critical long-term asset. They also provide short-term income and the daily food and nutrition for some 800 million livestock keepers across Africa [1]. Indigenous livestock breeds form the backbone of livestock production because of their ability to survive and reproduce under stressful tropical environments [2,3,4].
Although information on the status and trend of farm animals is limited, different indigenous breeds are found at different threat levels [5]; they are either declined or extinct [6]. At the moment breeds like Sheko cattle and fogera are highly threatened as a result of interbreeding with other breeds and change in production system, resulting in decline of the pure line [7,8]. These breeds are decreasing and deteriorating in terms of both population size and genetic quality due to paradigm shift in the existing farming system and production system, and farm size dynamics of the native habitat, higher intensity of off-take rate and in turn the subsequent genetic dilution [9,10]. From the review of Teweldemedhn [11], the major challenges in indigenous cattle production in Ethiopia were reported to be feed shortage, disease, inbreeding, and shortage of labor in their order of importance. Beyond this, the commercial livestock sector is also facing several new challenges in relation with the increased demand for livestock products [12].
The cattle population in Ethiopia is dominated by the indigenous zebu types that account 98.71 percent of the total population [11]. In the country the indigenous cattle have been traditionally selected for their adaptive traits [13] and the majority of milk was, therefore, produced from these local breeds. The national average lactation period per cow was estimated to be about six months and average daily milk yield per cow was about 1.32 liter [14]. Milk yield could be increased through within and between breed selection and crossbreeding with cattle from improved dairy breeds. The strategy currently employed in Ethiopia to increase milk yield is by crossbreeding [15] without neglecting the potential milk producers of local breeds like Fogera cattle.
Fogera cattle are one of the promising milk type local breed of Ethiopia that is widely adapted around Lake Tana of Amhara region. The breed in known for its relatively higher milk yield and traction power, better resistance to internal parasites infestation, and sound adaptability to water logged area attributed to its long legs [16]. Ethiopian farmers choose this breed as it tend to begin calving at an earlier age; their strength to plough the heavy clay soils found in the country's wetland areas; and the breed is valued for various social purposes, including, for example, as an important part of a bride's dowry [1,17]. Currently the breed is used as dam and sire line to make use of its respective mothering ability and large body frame; and considerable better milk yield and growth rate [7]. The unique value of this breed was recognized during the reign of the late Emperor Haile Selassie and in 1964 a Fogera cattle conservation and improvement center was established [1] at Gojjam province, Andassa ranch.
Andassa ranch, currently named as Andassa Livestock Research Center (ALRC) had exerted an improvement and conservation effort both on-station and on-farm level to safeguard the breed from extinction and decrement in its productivity since 1964. The center with its current name was shape since 1992 and start open nucleus breeding strategy to improve Fogera breed beyond conservation efforts. In the support of ALRC, Ethiopian Biodiversity Conservation [5] had indicated that they collected semen for cryo-conservation of Fogera cattle. The ex-situ conservation and improvement effort was done by own animal selection under the open nucleus breeding scheme; with community based breed productivity improvement (CBBPI) as an approach. The nal goal of the breeding scheme was restocking the declining village Fogera cattle population and improving the livelihood of the farmer. The objective of this paper, therefore, was to evaluate the performance of nucleus herd at ALRC and evaluate the result of rst term community based breed productivity improvement done under nucleus herd breeding scheme of Fogera cattle.

Description of working sites
Andassa Livestock Research Center (ALRC): is found at 587 km Northwest of Addis Ababa, and 22 km South of Bahir Dar city (capital of Amhara region), on the way to Blue Nile fall. The total area of the center is about 360 hectares out of which 310 are covered by pasture land and the rest 50 hectares is covered with bushes and different constructions. The center was established to conserve Fogera breed both in-situ and ex-situ approach. The center had above 600 nucleus herd animals for conservation and improvement strategy. Community based breed improvement program was implementing at two districts; those are known to have true-to-type Fogera cattle breed. These are: Gondar Zuria district: the district is found in North Gondar of Amhara regional state. It is located 12° 39' N latitude and 37° 19' E longitude. The altitude of the district is 1982 masl and the average annual rainfall range between 950 to1035mm. The annual temperature ranges from 27 o c to 33 o c. The total area coverage of the district is 114,983ha. The cattle population was estimated to be 212,164 [18].
Fogera district: the district is found in South Gondar of Amhara regional state. It locates 11°46' to 11°59' latitude and 37°33' to 37°52' longitudes. The altitude ranges from 1774 to 2410 masl, and receives mean annual rainfall of 1216.3 mm (ranging from 1103 to 1336 mm). The average minimum and maximum temperature of the district vary between 10.3°C to 27.2°C. It has an estimated cattle population of 182729. The land, about 44.2% is arable and 20% is irrigated, 22.9% for pasture, 1.8% forest or shrub land, 3.7% is water, and the remaining 7.4% is considered degraded land [19]. Figure 1 (right) indicates the working districts.

Description of Fogera breed
With its distinctive combination of a black muzzle, black inner ears, a black, white and grey coat colour, and its long legs and tail, the Fogera are one of the most iconic cattle breeds of Ethiopia. Found in the district bordering Lake Tana ( Fig. 1 left), Ethiopia's largest lake and the source of the Blue Nile, the breed is particularly well adapted to wet soils and swampy areas and cop adapted to wet soils and swampy areas and copes well with the heavy y, parasite and disease well with the heavy y, parasite and disease infestations, as well as low quality of feed, that characterizes this challenging environment [1]. The breed ( Fig. 2) is also characterized with short, stumpy, pointed horns; hump ranges from thoracic to cervicothoracic; dewlap is folded and moderate to large in size; docile temperament; used for draught, milk and meat [20,21].

Breeding strategy
The center follows open nucleus breeding scheme (Fig. 3), to improve milk yield of Fogera cattle. In the strategy, improved bulls from the nucleus had transported to community (village) herd and selected heifers to the nucleus herd. In the nucleus herd, animals are grouped based on their milk yield and pedigree. A single herd had 40 to 50 cows with one bull and mating is natural.Calves had free access to suckle their dams for the rst four days to ensure that they consume enough colostrum; they were then separated from their dams and allowed to partially suckle (two teats) at milking times until weaning.

Community Based Breed Productivity Improvement (CBBPI)
As a part of open nucleus breeding strategy, community-based breed productivity improvement is the implementation program of the strategy at the village herd. For the implementation, through participation of researchers and experts, two districts based on presence of true to type Fogera cattle (50%), Accessibility and presence of knowledgeable farmers (25%) and others like willingness of farmers, communal grazing land and enough land for feed development (25%) was selected. After selection, community discussion was done on points like the importance and productivity of the breed, its value for them and the need of the conservation and improvement strategy. After the consensus built with the community, farmers were selected to hold the breeding bull and serve the community. Those farmers were selected based on wealth status, cattle management ability, and presence of better educational background. And the bull was given based on written contractual agreement for four years' service and after to make him own property.

Data analysis
The collected data was analysed by general linear model (GLM) procedure of SAS [22] software. Milk yield performance was separately analysed by using period (Period 1, 2, 3, 4, and 5), category (10 and 25 percent of the herd), and breeding group (group I, II, III, and IV) as a xed factor. Pre-weaning growth (birth weight and weaning weight) was analysed using sex and year for nucleus herd; and district, year, sex, and season of birth for CBBPI data as a xed factor. The following GLM models was used for birth and weaning weight for both sites. Y ijkl = µ + B i + D j + X k + S l + e ijkl Where, Yijklm = m th record of i th year, j th season, k th sex and l th parity µ = overall mean B i = effect of i th year of birth D j = effect of j th district X k = effect of k th sex S l = effect of l th season e ijklm = random error associated with each observation ASREML [23] a statistical package that ts linear mixed models using Residual Maximum Likelihood (REML), was used to estimate the selected genetic parameters. To t the models based on the data (Table 1), the data was arranged in to performance data (birth weight and weaning weight) and pedigree data (animal, sire and dam ID) based on the guidance of the software. Genetic parameters were estimated for heritability and correlation for birth and weaning weight. The xed effects (sex, season and year) were included in the mixed model after they are checked for their signi cance effect via GLM procedure of SAS. The variance components and heritability were estimated using a uni-variate animal model, indicated below.
Where, Y is the vector of records; b is vector of xed effects; X is incidence matrix of xed effects; a is vector of direct additive genetic effect; m is vector of maternal additive genetic effect; c is vector of permanent environmental effect; Z1 is incidence matrix for direct additive genetic effect; Z2 is incidence matrix for maternal additive genetic effect; Z3 is incidence matrix for permanent environmental effect and e is vector of random errors  (Table 3); this result had an increment compared with the average milk yield of 3.04 and 2.62 liter [24] for respective best 10% and 25% of similar herd. The predicted 200 and 305 days milk yield of the best 10 and 25% of the herd was reported in Table 3. As Table 4 presents, the group herd had variations in milk yield performance as they are group based on their milk yield performance. Among the entire herd, some elite cows give an average of 5.45 ± 0.73 with a maximum yield of eight litters; and this indicated that the selection response of the breed is higher.
The milk yield of the current study was higher than 1.65liter for Horro breed [25] Table 5, the result had shown an improvement from year to year which the response for selection is done on the breed. The result for birth weight was lower than the report of [31,32,33,34,17], and higher than [6, 35] for different Ethiopian local breeds. The weaning weight (Table 5) was higher than the report of [33,32,34,17,36,6]. These differences might be occurred due to difference in breeding objectives of the breeds.  (Table 6). Higher result for respective birth weight and weaning weight of 0.38 ± 0.32 and 0.22 ± 0.25 was reported by [37] at the same center. This difference might be due to management difference that in uences the environmental part of the estimated genetic parameter. The phenotypic and genotypic correlation with their respective standard error between birth and weaning weight was 0.0613 ± 0.0075 and 0.0712 ± 0.0343, respectively. A lower phenotype (0.05 ± 0.02) and higher genotype (0.6 ± 0.23) correlation was reported by [38 for Fogera cattle breed at Metekel Fogera cattle conservation site. Higher direct heritability estimate was reported to be 0.68 ± 0.09 and 0.52 ± 0.1 [39], and 0.4 ± 0.1 and 0.47 ± 0.1 [40] for birth and weaning weight, respectively. σ 2 a = direct genetic variance; σ 2 m = maternal genetic variance; σ 2 c = maternal permanent environmental variance; σ 2 e = the residual variance; σ 2 p = phenotypic variance; h 2 a = direct heritability; h 2 m = maternal heritability; C 2 = the fraction of total variance that corresponds to maternal permanent environmental effect; r am = direct-maternal genetic correlation 3.2. Community based breed productivity improvement (CBBPI)

Birth and weaning weight achievements
Since 2012, the center had work on village breed improvement from the entire herd of the community. But after 2013, the implementation of open nucleus breeding scheme was done and selected bulls, based on their estimated breeding value and physical soundness, from nucleus herd were distributed to the selected villages. Since then, 17 pure Fogera bulls were distributed in two terms for both working districts.
In rst term (four year period), the mating bulls were transferred to the keeping farmers based on written agreement. The birth and weaning weight (at 8 month age) of the village herds born from CBBPI was 23.77 ± 0.21kg and 85.89 ± 1.07kg, respectively ( Table 7). The average weaning age was lowered from one year to 8 months. Based on the monitoring data the average birth and weaning weight of calves born by local bull of the area was 20.21 and 85.14kg (at one year age), respectively. From this it can be appreciated that, through the open nucleus breeding program, there was an improvement in productivity beyond the conservation effort.
As a strategy, community based breed productivity improvement, includes different aspects of activity besides the breeding program. These activities, done in relation of the breeding program was strategic deworming and vaccination through ock monitoring strategy, grazing land improvement and introduction of new water logged tolerant grass specious and fattening technology demonstration; those all allow to improve the production improvement and the livelihood of the farmers. Above 1000 households are bene ting in the strategy through the CBBPI. Through the rst term of the breeding program, above 38 castrated bulls fattened (Fig. 4); above 24,000 cattle covered by health treatment and Elephant grass, four water logging tolerant grass cultivars were introduced to alleviate feed problem of the area. As CBBPI activities are long lasting, documentations had been done in every and each journey of the activity, which allow to see the drawbacks, identi ed challenges, take corrective measures, and further developing guidelines to other users and share the experiences to other areas. In this regard, CBBPI activity on Fogera cattle had documented in different forms viz. via videos, photos, publications (journals and proceedings) and other written documents.
Participant farmers, getting a calve (Fig. 5) from the improvement effort, had "acknowledged Almighty GOD for having the cattle phenotype of their elder fathers". All farmers are well satis ed by the service delivered in relation to the conservation and improvement activity to improve the production environment.
Non-participating farmers of neighboring gotes, kebeles and districts requests the research center to expand the conservation and improvement work with their vicinity. 4. Major Challenges Of Cbbpi Of Fogera Cattle 1: Over ooding of Lake Tana: the lake, always over ood to the grazing land and make stagnant water for several months that lead disease outbreak and damage on the grazing land.
2: Invasive weeds: in both sites, the grazing land had covered by unpalatable weeds like Amekela (Asracantha longifolia) and water body invasive weeds (water hyacinth) (Fig. 6 left) share the land and aggravate cattle disease. Based on the report of EBI [5] so far, close to 35 invasive weed species are identi ed in Ethiopia, and they cause biodiversity loss by competing native species for feed and habitat and altering the physical environment in a way that excludes native species. From which, water hyacinth (Eichhornia crassipes) was a lead that have a big effect on water body animals and livestock species depending their feed on grazing.
3: Shift of production system: the dominant livestock-crop mixed production system of the areas was currently dominated by crop production and diversi cation that change the grazing lands to crop production.

4: Genetic erosion:
intact male Fogera bulls (Fig. 6 right) are currently get better price to the neighbouring countries market (like Sudan and Djibouti). This, with absence of marketing policy for border live animals, challenges both the conservation and improvement strategy.

Conclusion And Lessons Learnt
√ In the current study, the result across year and period had shown an inconsistence result; which might be attributed to the presence of variable management practices adopted by the center. On the other hand, the result had indicated an improvement in the production performance of the breed that indicated the potential for selection is higher in the breed.
√ The community conservation and improvement strategy was a big entry point to assure the conservation effort, restocking of the declined village heard and improve the livelihood of the farmers. .

Future Directions
With the above bold conclusions, the following recommendations are made to further strengthen the conservation and improvement effort of the breed.
Strong linkage and follow up of the community should be done.
The production environment of the conservation and improvement sites should be strengthen to improve the livelihood of the farmers through optional income generating activities Developing a reproductive technology and biotechnology unit to safe guard the breed from extinction by natural and/or manmade hazards had better be planed and implemented.
Scaling up of the activity should better be planned with integrated approach of different stakeholders Declarations Data Availability The raw data used to support the ndings of this study are restricted by the institution in order to protect patient privacy. If necessary, contact the corresponding author.

Con icts of Interest
The authors declare that they have no conflict of interest.
Author's contribution Ethics approval and consent to participate Not applicable.