Advances in Animal Science, Theriogenology, Genetics and Breeding

Research Article - (2022) Volume 10, Issue 1

Indigenous goat selection and breeding practices in pastoral areas of West Guji zone, Southern Oromia, Ethiopia
Wondim Awoke* and Teshager Muluneh
 
Department of Animal Science, College of Agriculture, Injibara University, Food and Climate Science, P.O. Box 40, Injibara, Ethiopia
 
*Correspondence: Wondim Awoke, Department of Animal Science, College of Agriculture, Injibara University, Food and Climate Science, P.O. Box 40, Injibara, Ethiopia,

Received: 07-Jan-2022, Manuscript No. AASTGB-22-51368; Editor assigned: 10-Jan-2022, Pre QC No. AASTGB-22-51368 (PQ); Reviewed: 24-Jan-2022, QC No. AASTGB-22-51368; Revised: 31-Jan-2022, Manuscript No. AASTGB-22-51368 (R); Published: 10-Feb-2022, DOI: 10.51268/2736-1810-22.10.058

Abstract

Placing relevant breeding objectives and identification of indigenous breeding practices is crucial to integrating modern development in animal breeding into purposeful industry programs. Hence, the objective of this study was to identify selection criteria and indigenous breeding practices of the goat in Abaya and Galan district southern Oromia, part of Ethiopia. Data were collected from 180 households through interview schedules and focus group discussions. The effective population size and inbreeding rate of the community were calculated using ΔF=1/2Ne. Conformation, growth rate, coat color for buck and conformation, twining ability, age at sexual maturity, kidding interval, and color for females are selection criteria for replacement of stock in the study area. In both districts, farmers have relatively similar production and breeding objectives. Conformation is hub selection criteria for replacement of breeding flock. The study area has liable by inbreeding 0.22 in Abaya and 0.29 in Galan. Goat in the study area is prolific twinning birth (72.22%). Trait preferences of farmers in goats were conformation, growth rate, twinning, and kidding interval. Hence adopting a community-based goat breeding program that is suited to study areas which aimed at improving preferred traits is relevant.

Keywords

Breeding, Castration, Indigenous, Selection.

Introduction

According to (Kosgey et al., 2008), small ruminants are an integral part of livestock keeping in Sub-Saharan Africa that supports a regular large human population for both tangible and/or intangible purposes. Small ruminants provide income, meat, milk, skin, manure, serve as a living bank against the various climatic challenges (crop failure, drought, and flooding), and have served for socio-cultural values for diverse traditional communities (Adane and Girma, 2008).

Ethiopia is home to varied goat populations, numbering 30.20 million heads, out of these total goat populations 70.61% are females and the remained are males (CSA, 2017).

In Ethiopia, goat production has traditionally been an integral part of the farming activities in all agro-climatic conditions (Dereje et al., 2013). Being relatively tolerant to drought, more than 75% of the goat population is found in large flocks in the arid and semi-arid lowlands (Gebreyesus et al., 2012; Solomon et al., 2010).

The process of genetic improvement of livestock is systematic and follows several important steps: identification of the breeds or strains of livestock and type of the environment in which they reared selection of breeding objectives, development of selection criteria, genetic evaluation, and finally design of appropriate breeding systems (Mekasha and Isaac, 2004). Genetic improvement will be accompanied by a good understanding of the different farming systems and when simultaneously addressing several constraints (Kosgey and Isaac, 2004). For successful goat improvement programs, the compatibility of the genotypes with those of the breeding objectives of the communities and the production system is indispensable (Belete et al., 2015). Farmers’ preferred traits level in the animals may be an indirect indication of what constitutes a good animal, the successful pursuit of which constitutes good achievements of the breeding objectives (Gemeda, 2010). Breeding objective defines the direction in which farmers would like to go towards satisfying their demand for specific products and services from the animals and increasing profit (Nandolo et al., 2016). Breeding objectives include all relevant characteristics of an animal such as production, reproduction, fitness, and health characteristics (Kosgey and Isaac, 2004). Breeding objective traits have to be easy to measure, heritable and variable, and not too many (Hagos et al., 2018).

Various methodological approaches have been used to identify breeding objectives of goats in Ethiopia, for instance, choice experiment method, ranking among a list of traits, and live animal rankings (Banerjee et al., 2000). Placing relevant breeding objectives, identifying indigenous breeding practices, and assigning relevant breeding objectives are crucial to the development of animal breeding programs (Tadele, 2010). However, programs will be successful when accompanied by a good understanding of the different farming/production systems, breeding objectives, and addressing several constraints (Baker and Gray, 2003).

Several studies have shown that goat keepers have developed their breeding practices which include a selection of bucks (Grum, 2010) or does (Tegegne, 2012) that are used either in controlled (Grum, 2010) or uncontrolled (Tesfaye et al., 2012) mating systems. Some studies, however indicated an absence of selection in these approaches (Samuel, 2005; Tsedeke, 2007; Dereje, 2011) where selection is practiced, the criteria used are based on maternal (ancestral) history, production performance appraisal, and some other traditional systems. About 90.8% of Short-eared Somali goat keepers in Dire Dawa select their breeding stock based on maternal history (Grum, 2010; Feki, 2013). However, in the Central Rift Valley area both subjective and objective selection criteria are used with more emphasis placed on morphological traits of bucks (Tesfaye et al., 2012).

Besides goat keepers in Ethiopia practice different traditional breeding practices which include a selection of bucks or does that are used either in controlled or uncontrolled mating systems (Getinet et al., 2016). These research findings indicated that the previous research studies lack the consistency of results. Also, there is limited information on breeding objectives and practices, trait preferences, and selection criteria of breeding stock used by owners of goats in southern parts of the Ethiopia especially in Abaya and Galan where indigenous breeds have special merit in the twinning type of birth. Consequently, this study was undertaken to identify breeding objectives, existing breeding practices, and selection criteria of goat owners in southern Oromia, Ethiopia.

Research Methodology

Sample size, sampling techniques, and data collection

The study was conducted in two districts of the pastoral areas, Abaya and Galan. For this study, site selection and the household baseline surveys were conducted from September 1 to the beginning of December 2019. The purposive sampling technique was applied to select the study districts based upon the production potential by consulting the agriculture and natural resource office of the zone. Similarly, nine kebele were selected from each sample district based upon the size of the goat population. Sample households from each kebele were selected randomly. 180 households (90 per district, 10 per kebele) were taken. Data such as flock structure, size of goat per household, breeding practices, desirable qualities or selection criteria’s of both doe and buck, mating system, castration methods, reproductive performance and prolificacy of goat and purpose of keeping goat were collected through interview schedule. In addition, data were collected through focus group discussions which comprise 10-15 numbers of participants. The group was composed of extension workers, developmental agents (DAs), model farmers, and village leaders.

Method of data analysis

All data gathered during the study period were coded and recorded in Microsoft Excel 2007 and SPSS version 20. Descriptive statistics were used to describe the results as percentages for both districts. Microsoft Excel was used for ranking data in a selection of doe and buck for breeding. The ranking was expressed as an Index=Sum of (3 × ranked first+2 × ranked second+1 × ranked third) given for an individual reason divided by the sum of (3 × ranked first+2 × ranked second+1 × ranked third) for all reasons (Musa et al., 2006). Furthermore, the effective population size and inbreeding rate of the community was calculated by combining individual household. An estimate of the average change in percentage inbreeding was calculated with the following expression:-

ΔF=1/2Ne

Where:

ΔF=Rate of change in inbreeding

Ne=(4 Nm×Nf)⁄(Nf+Nm)

Ne=the effective population number

Nm=number of breedable male

Nf=number of breedable females (Falconer and Mackay, 1996)

Results and Discussion

Goat flock structure and management

Adopting a breeding program appropriate to the production system helps genetic improvement and reduces incompatibility of genotype with farmer breeding objectives and production system and production environment which aimed at improving preferred traits. In this study, breeding does comprise a dominant part of the flock followed by kids between 6 months to one year. The higher proportion of adult females than other age groups across both study areas indicates the practice of retaining females for breeding (Table 1). This is due to the fact that goat keepers in the pastoral production system possessed significantly large proportions of female goats for breeding and occasionally for milk consumption. This result is in line with the work of (Solomon et al., 2010) the proportion of different classes of animals reflects the management decision of the producers which in turn is determined by their production objectives. The ratio of males to females in both districts at the age of fewer than six months was proportional. However, female proportions were higher than males at the age of greater than one year in both districts. This is because male goats were frequently sold whenever cash is needed and farmers did not prefer female goats for meat purposes. This finding was in agreement with the result of (Grum, 2010) in the Dire Dawa zone, (Mahilet, 2012) in Eastern (Hararghe and Tesfaye, 2010) for the Arsi-Bale goat population, in which the proportion of females is higher than a male goat. However pastoral and agro-pastorals keep a higher proportion of females reflecting the owners' need for milk for long periods in the hot environment (Farm-Africa, 1996 and Alefe, 2014).

Table 1. The goat proportion by sex and age across the study areas.

Goat class by sex and age Districts
Abaya N(90) Galan N(90) Overall
Sum(n) Mean ± SE % Sum(n) Mean ± SE % Mean ± SE
<6-month male kids 125 1.38 ± 0.17 15.43 68 0.76 ± .09 16.19 1.07 ± 0.1
<l.6-month female kids 147 1.63 ± 0.18 18.14 61 0.47 ± .07 14.52 1.05 ± 0.1
Male 0.5 to 1 year (Bucks) 100 1.13 ± 0.13 12.34 43 0.72 ± .06 10.23 0.92 ± 0.07
Female 0.5 to 1 year (Does) 127 1.49 ± 0.19 15.67 65 1.07 ± 0.08 15.47 1.28 ± 0.1
Male>1 year (Breeding buck) 65 0.72 ± .1 8.02 66 0.73 ± .09 15.71 0.73 ± 0.07
Female>1 year (Breeding does) 211 2.34  ± .33 26.02 96 1.07 ± .10 22.85 1.71 ± 0.17
Castrated male 35 0.39  ± .09 4.32 21 0.23 ± .05 5 0.31 ± 0.05
Total 810 9 ± 0.74 100 420 4.69 ± 0.23 100

Farmers in the study area sell out young goats well-conditioned male goats to earn a better price. This trend of selling early maturing and having fast growth male goats may affect the improvement of the flock in consecutive generations. The ratio between males greater than one year of age and their female counterparts in Abaya and Galan districts was 1:3 and 1:2 respectively. This result is contradictory with that of (Adugna, 1998) who explains 1:4 in Kochore district, southern Ethiopia, and (Wilson, 1989) who explained the ratios 1:4 to 1:6 a standard for small ruminants in traditional livestock production systems of Africa. This was due to the study area holding a small number of goats per flock. In this study, a small number of breeding males and females may bring a high rate of inbreeding (Table 1).

Goat breeding practices

The genetic improvement is cumulative and eventually leads goats to mature earlier in Galan than Abaya, which is indeed a directional/natural selection. Moreover, it is not uncommon that goat herders in different localities have their own trait preferences and selection criteria based on existing production environments, market demands, and other factors that lead to variation in selection criteria. For instance, (Gebrekiros, 2014) reported that farmers in Western Tigray prioritize the twining ability of goats over any other traits in Begait/Barka goats.

Selection criteria for breeding buck

The selection criteria of breeding bucks are indicated in Table 2. The selection of stock for breeding purposes is a prerequisite to replace better stocks by considering its own morphological, adaptive, and production characteristics. In this study traits like conformation, growth rate, coat color, pedigree, and age were considered as important traits in selecting breeding buck. In Abaya district conformation/appearance, color (white and red), and growth rate of buck were ranked 1st, 2nd, and 3rd, respectively. The corresponding rankings for the Galan district were, conformation/appearance followed by the growth rate, color, and age of buck.

Table 2. Ranking selection criteria of breeding buck.

Selection criteria Abaya Galan
R1 R2 R3 I R1 R2 R3 I
Conformation 78 7 2 0.46 74 7 1 0.44
Color 0 39 26 0.19 4 10 22 0.1
Horn 0 4 8 0.03 0 1 1 0.01
Character 0 0 7 0.01 4 4 2 0.04
Adaptability 0 0 2 0 0 3 11 0.03
Growth rate 8 15 24 0.14 8 38 14 0.21
Age 0 4 7 0.03 0 20 8 0.09
Libido 0 3 0 0.01 0 4 16 0.04
Pedigree 4 18 14 0.11 0 3 15 0.04

However, goat herders in both districts commonly focus on body conformation (long leg) to select breeding buck, which is indeed highly associated with genetic performances. This indicates that goat herders have their ways of ranking traits based on the purposes they keep. This result was in agreement with the finding of (Belete, 2013) who reported that farmers select their buck by considering appearance in the Bale zone which is similar production (crop-livestock) system with study area. Selecting buck by growth rate was more practiced in Galan than Abaya. This might be associated with the fact that Galan is a district known as a hub for growing cash crops, mainly coffee that created a market opportunity for goat herders in the areas to focus on the fast growth rate for better prices (Table 2).

Selection criteria for breeding doe

Selection criteria of breeding doe in the study area are presented in Table 3.

Table 3. Ranking selection criteria for breeding doe.

Selection criteria  Abaya  Galan
R1 R2 R3 I R1 R2 R3 I
Conformation 78 2 6 0.45 77 5 0 0.45
Color 0 25 18 0.13 2 14 13 0.09
Kid growth 0 0 9 0.02 0 8 23 0.07
Age at sexual maturity 1 5 2 0.03 6 24 24 0.17
Kidding interval 1 25 16 0.13 0 12 12 0.07
Twining ability 10 25 15 0.18 4 26 13 0.14
High milk yield 0 8 24 0.07 1 1 5 0.02

According to the respondents' opinion, conformation/appearance is the main criteria for the selection of doe in both districts. However while twining ability ranked second in Abaya district, age at sexual maturity was given the second priority in Galan (Table 3).

Mating and castration

The percentage of households who practiced buck castration and the method of castration used are presented in Table 4. The proportion of households who practiced castration and the average age of castration varied from place to place. As per the respondents, 79 and 74% practiced castration in Abaya and Galan districts, respectively. About two-thirds of respondents practiced the modern method of castration indicating that goat keepers in the study districts have access to local veterinary services. A similar result was reported by (Mahilet, 2012) in Eastern Hararghe. Indeed, this is a common practice by livestock keepers where the respondents indicated that castration is a value-adding process (fattening) in both districts to avoid weight loss due to mating that eventually benefits farmers earn better prices at marketing. Moreover, respondents argued that a castrated goat has fewer odors, produces tasty and tender meat than uncastrated goats. Almost all respondents in both districts report selecting the breeding buck for future generations. One of the drawbacks observed in both districts was that there was no controlled mating practice. This leads to a high inbreeding rate that eventually leads to population inbreeding depression (Maiwashe et al., 2006) (Table 4).

Table 4. Breeding practices of goat farmers.

Abaya N (%) Galan N (%) Overall N (%)
Yes No Yes No Yes No
1. Do you identify a sign of heat? 89(98.9) 1(1.1) 62(68.9) 28(31.1) 151(83.9) 29(16.1)
2. Do you allow others to mate your doe? 90(100) - 90(100) - 180(100) -
3. Did buck mate his
  • Mother
90(100) - 90(100) - 180(100) -
  • Sib
90(100) - 90(100) - 180(100) -
  • Progeny
90(100) - 90(100) - 180(100) -
4. Do you select breeding bucks? 90(100) - 88(97.7) 2(2.2) 178(98.9) 2(1.2)
5. Do you practice castrate buck? 71(78.9) 19(21.1) 67(74.44) 23(25.5) 138(76.7) 42(23.3)
6. Methods of castration use
  • Modern
70(77.8) 59(65.6) 59(65.6)
  • Traditional
30(33.3) 31(34.4) 31(34.4)

Effective population size and rate of inbreeding

The effective population size (Ne) and the rate of inbreeding (ΔF) calculated for goat flock in the study area is presented in Table 5. Effective population size is a measure of genetic variability within a population, with large values of Ne indicating more variability and small values indicating less genetic variability. In this study, the estimate of effective population size (Ne) was 2.2 and 1.73 in Abaya and Galan districts, respectively. The rate of inbreeding in the study area is beyond the threshold level or maximum acceptable level (0.063) (Armstrong, 2006). This was due to small effective population size, utilization of breeding buck born within the flock, and uncontrolled mating. This finding is comparable to that of (Tesfaye, 2010) who reports the inbreeding coefficient of Afar sheep in Ethiopia (0.20) and (Belete, 2013) who reported 0.21 from a Bale goat population (Table 5).

Table 5. The inbreeding rate and effective population size.

District When flock are not mixed
Nm Nf Ne ΔF
 Abaya 0.72 2.32 2.2 0.22
Galan 0.73 1.07 1.73 0.29

Measures of reproductive performance

The reproductive performance of the goat in the study area is summarized in Table 6. The overall mean reproductive lifetime of the female goat was 7.2 ± 0.12 years within this year a doe could produce around 12.1 ± 0.22 kids. Age at first kidding (AFK) can be defined as the age at which does give birth for the first time. The overall Age at first kidding (AFK) of goats in the study area was 12.11 ± 0.40 months. This is in agreement with the study of (Alefe, 2014) who reported AFK of indigenous goats in the Shabelle zone, Ethiopia was about 14.75 months, and (Gebrekiros, 2014) who reported AFK of 12-18 months for Begait goats. However, (Adugna, 1998) reported AFK of 19.5 months for Kochore goats in SNNP. Age at first kidding in Ethiopian breeds is a well-known trait at the farm level and it ranges from 12-24 months (Girma, 2008). Age at first kidding is highly variable and dependent on the growth rate and management practices (Song and Sol, 2006).

Table 6. Reproductive parameters of sampled goats.

Reproductive trait Abaya Galan Overall
 Mean+SE Mean+SE Mean+SE
Average age at first kidding (months) 11.99 ± .612 12.17 ± .248 12.11 ± .398
Average kidding interval (months) 7.62 ± .122 8.04 ± .243 7.83 ± .136
The average reproductive life span of doe (years) 7.58 ± .167 6.74 ± .170 7.16 ± .123
Average servicing age of buck in a flock (years) 4.37 ± .127 4.6 ± .087 4.5 ± .077
The average number of kid crops per doe (Number) 12.02 ± .381 12.20 ± .221 12.11 ± .220

The overall average Kidding Interval (KI) in months for Abaya and Galan goats was 7.83 ± 0.13. This is contradictory with a report of (Mahilet, 2012) who reported a kidding interval of 6.56 ± 0.04 months for Eastern Hararghe goats. According to studies of (Belete 2013; Alefe 2014 and Tesfaye et al., 2012) KI interval ranges from 8-11.7 months for different breeds of goats in Ethiopia. Moreover, poor nutrition and prolonged suckling resulted in the longer interval between kidding. The overall reproductive lifetime of male goats was also 4.5 ± 0.77 years which is shorter than their female counterparts. This is mainly due to the fact that, except bucks used for breeding, most males are castrated and do not stay long in the flock as they were sold. This result is disagreeing with other previous studies such as (Belete 2013 and Alefe 2014) who reported that the reproductive life span of the buck was 8.6 and 6.5 years in Bale and Shabelle zones, respectively (Table 6).

Prolificacy of goat

The prolificacy of the goat in the study area is summarized in Table 7.

Table 7. Prolificacy of goat.

Types of birth Abaya Galan Overall
  N % N % N %
Single 28 31.11 20 22.22 48 26.66
Twins 61 67.78 69 76.66 130 72.22
Triplets 1 1.11 1 1.11 2 1.11

Based on the respondent's opinion, a higher twinning rate of about 72.2% was reported, with only 26.66% single births. This implies that the goat population in the study area is highly prolific and warrants closer attention for selection. This result is disagreeing with the similar production system study of (Mahilet, 2012) who describes single birth as highly predominant in Eastern Hararghe goats. Also, the present result is significantly higher than the twining rate report of Woito Guji goats, which was only 16%, and Arsi Bale goats breeds (18%) (Farm-Africa, 1996) (Table 7).

The purpose for keeping goats

The purpose of keeping a goat in the study area is shown in Table 8. The main purpose of keeping a goat in Abaya was mentioned as sources of income, insurance risk (live asset), and meat consumption whereas sources of income, meat, and saving are primary purposes in Galan. Traditionally, goat keepers in the study district believe that eating goat meat and its by-product (blood, brain, and small intestine) have some medicinal values. Milk is consumed by goats in both districts. This finding was disagree with the result of (Ahmed et al., 2015) who reported that milking was not accustomed by the community of Horro Guduru district of Wolega zone like in the case of some pastoral communities (pastoral and agro-pastoral production system) in Ethiopia, goat milk is consumed.

Table 8. Purpose of keeping a goat.

Purpose Abaya Galan
R1 R2 R3  I R1 R2 R3 I
Meat 12 18 30 0.19 8 27 30 0.2
Milk 3 10 11 0.07 0 2 0 0.01
Feels for hats and mattresses 1 1 0 0.01 7 3 0 0.05
Sale (cash income) 31 31 16 0.32 55 17 3 0.37
Insurance for risk 27 24 10 0.26 1 0 12 0.03
Ceremonies(gift/wedding, sacrifices) 1 0 2 0.01 0 0 0 0
Prestige and socio-culture value 1 1 1 0.01 5 2 2 0.04
Savings 4 3 7 0.05 10 18 31 0.18
Collateral(for loan, compensation) 1 0 6 0.02 0 0 0 0
 Dowry 0 1 0 0 0 0 0 0
 rituals 2 1 1 0.02 0 0 0 0
Manure as fertilizer 2 0 6 0.02 0 16 12 0.08
Skin for home use 5 0 0 0.03 4 5 0 0.04

The utilization of goat manure as soil fertilizer is higher in Galan than in Abaya indicating that farmers in Galan practice crop cultivation as their supplementary farm activities as compared to the pastoral system practiced in Abaya.

Goat milk is consumed in both districts, indeed milking goat is a common practice in the pastoral and agro-pastoral production systems. Group discussants in districts believed that goat milk has medicinal value for children against ascarids. Moreover, it was reported that goat milk increases the appetites of the children. It was reported that specifically goat blood is given to women immediately after birth to cure lesions and overcome anemia due to heavy blood loss (Table 8).

Conclusion and Recommendation

Farmers preferred many traits like Conformation, growth rate, coat color for buck and conformation, twining ability, age at sexual maturity, kidding interval, and color for females as selection criteria for replacing their stock. Moreover, conformation is a hub or primary selection criteria for both sexes of goat flock. Adopting a breeding program (community-based) that suited to this area which aimed at improving preferred traits is relevant.

Acknowledgments

We thank your ministry of education of Ethiopia and district and kebele experts for their unlimited support.

Authors’ Contributions

Teshager Muluneh participated in designing all research and wrote the manuscript. Wondim Awoke conducted data analysis and comments. All authors read and approved the manuscript.

Funding

This work was supported by the National ministry of education for staff development.

Availability of Data and Materials

Data were available in the hands of Corresponding Author

Ethics Approval and Consent to Participate

The manuscript does not contain clinical studies or patient animals

Consent for Publication

Not applicable.

Competing Interests

The authors declare that there is no conflict of interest involved in this study.

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