Crossbreeding cattle in beef production programmes in Kenya. II. Comparison of purebred Boran and Boran crossed with the Red Poll and santa gertrudis breeds

Trail, J.C.M.; Gregory, K. E.; Durkin, J.W.; Sandford, J.

doi:10.1007/bf02265318

Cited by 10 publications

(6 citation statements)

References 6 publications

(12 reference statements)

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“…The significance of the fixed effects in the present study is in general agreement with the literature (Duarte-Ortuno et al 1988;Trail et al, 1984). Including weaning age of previous calf and adjusted weaning weight as a covariate for CI and AFC respectively, did not have any statistically significant effect.…”

Section: Discussionsupporting

confidence: 91%

“…The mean AFC and CI is higher than estimates for the same breed under ranch conditions in Kenya (Trail and Gregory, 1981;Trail, Gregory, Durkin and Sandford, 1984). However, the mean for CI after records longer than 2 years were deleted was similar to the mean of 421 days reported by Trail et al (1984).…”

Section: Discussionsupporting

confidence: 51%

“…The performances in terms of CI and AFC in this herd were low, particularly in view of the high level of fertility of the breed (Trail and Gregory, 1981;Trail et al, 1984;Maule, 1990). One explanation for this could be that breeding bulls were not evaluated for their semen quality or quantity and that cow to bull ratio was on the higher side when compared with other herds (e.g.…”

Section: Discussionmentioning

confidence: 87%

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Genetic and environmental effects on age at first calving and calving interval of naturally bred Boran (zebu) cows in Ethiopia

Haile‐Mariam

Kassa-Mersha

1994

Anim. Sci.

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Twenty-four years of data from a Boran cattle breeding and improvement ranch in the Rift Valley of Ethiopia were used to study the influence of genetic and environmental factors on age at first calving (AFC) and calving interval (CD using an individual animal model. The mean AFC and Cl were 41-8 months and 442 days, respectively. The h 2 values for AFC were 0-062 and 0-075 when estimated on the original and selected data, from which cows that did not calve after 5 years of age were deleted, respectively. The h 2 values for CI were 0-037 and 0-043 when estimated on the original and selected data, from which cows with AFC higher than 5 years and CI longer than 2 years were deleted, respectively. The corresponding c 2 values (ratio of permanent environmental variance to total) were 0-031 and 0-028 for the respective data sets. Parameter estimates of the original data from bivariate analysis were 0-012 (h 2 ), 0-065 (h 2 ), -0-054 and -0-176 for first CI, AFC, their genetic and environmental correlation, respectively. The h 2 values estimated in a bivariate analysis of the first three CIs varied between 0-002 and 0-093. Year and season had significant effects on both traits. The annual genetic change for both traits was not significant while the solutions for year effects were highly variable. The regression of the solutions of year effects for AFC on year showed that it increased by about 10 days while the variation in CI was due to random year to year fluctuation.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 51%

Section: Discussionmentioning

confidence: 87%

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Genetic and environmental effects on age at first calving and calving interval of naturally bred Boran (zebu) cows in Ethiopia

Haile‐Mariam

Kassa-Mersha

1994

Anim. Sci.

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“…1988). Because of these potentials, this breed is recommended for use in performance improvement of other indigenous and exotic cattle for beef production in the tropics (Trail et al. 1984).…”

Section: Introductionmentioning

confidence: 99%

Economic values for production and functional traits and assessment of their influence on genetic improvement in the Boran cattle in Kenya

Rewe

Indetie²,

Ojango

et al. 2006

J Animal Breeding Genetics

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Economic values for production (sale weight in steers, SWs, kg and heifers, SWh, kg; dressing percentage, DP; consumable meat percentage, CMP and milk yield, MY, kg) and functional (cow weight, CoWT, kg; cow survival rate, CoSR, %; postweaning survival rate, PSR, %; feed intake of cows, FIc, heifers, FIh and steers, FIs, kg DM) traits were estimated for six production systems utilizing the Boran breed in Kenya. The influence of the estimated economic values on genetic improvement was also assessed using different selection indices. The six production systems were described according to their sale age, levels of input and final goal, namely, short-fed medium input beef (SMB); long-fed medium input beef (LMB); short-fed high input beef (SHB); long-fed high input beef (LHB); long-fed low input dual purpose (LLD); and long-fed medium input dual purpose (LMD). Two evaluation bases were considered: fixed herd size and fixed pasture input. In the fixed herd-size situation, the economic values for production (except MY in beef systems) and functional traits (except FI in all systems) were positive meaning a unit increase in genetic merit of these traits had greater influence on revenues than costs. As expected, the economic value for MY was negative in the pure beef systems (SMB, LMB, SHB and LHB) and positive in the dual-purpose systems (LLD and LMD). When compared with the economic values estimated in the fixed herd-size situation, in the fixed pasture input situation they were lower for feed intake in the three classes of livestock and other traits related to it in all systems. These traits were CoSR, CoWR, PSR, CoWT, SWh and MY. The economic values for CoWT in LLD and LMD were negative (KSh -11.14 and -15.33 respectively). The economic values did not influence much the direction of the genetic response in each trait in the different production systems. However, the magnitude of the actual gain was dependent on the index applied. The magnitude of the economic values for production and functional traits estimated in this study suggest that genetic improvement of these traits will have a positive effect on profitability of Boran cows kept in dual-purpose systems and when herd size is restricted. In beef systems, genetic improvement of MY will have a negative effect on profitability, especially when restrictions on herd size and feed exists.

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“…We conducted a combination of systematic and meta-reviews as the methodology of qualitative comparative analysis (QCA). To do this, we used the actual published studies as our data (rather than the data used by each study), and this enabled us to pool non-standardized and qualitative information [8] for adaptation traits while for production and reproduction parameters [5] quantitative parameters were pooled to obtain estimated mean values.The implementation of the systematic and meta-reviews followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guideline [9] determination of quality of the information available in these articles (6) evaluation of the extent of heterogeneity of the articles [9,10]. The outcomes of interest were production, reproduction and adaptation characteristics of Boran cattle breed and the questions addressed were the following:…”

Section: Scope Of Studies and Evaluated Traitsmentioning

confidence: 99%

Production, Reproduction and Adaptation characteristics of Boran cattle breed under changing climate: A systematic review and meta-analysis

Bayssa

Yigrem

Betsa

et al. 2020

Preprint

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IntroductionClimate change has devastating effects on livestock production and productivity, which could threaten livestock-based food security in pastoral and agro-pastoral production systems of the tropics and sub-tropics. Hence, to sustain livestock production in an environment challenged by climate change, the animals must have the ability to survive and produce under extreme conditions. Boran cattle breed is one of the hardiest Zebu cattle reared by Borana Oromo pastoralists for milk and meat production. This paper aims to compile the main production, reproduction and adaptation traits of Boran cattle based on systematic review amd meta-analysis of peer reviewed and published articles on the subject.MethodologyCombination of systematic review and meta-analysis based on PRISMA guideline was employed. Accordingly, out of 646 recorded articles identified through database searching, 64 were found to be eligible for production, reproduction and adaptation characteristics of the Boran cattle, twenty-eight articles were included in qualitative systematic review while 36 articles were used for quantitative meta-analysis.ResultBoran cattle have diversity of adaptation (morphological, physiological, biochemical, metabolic, cellular and molecular) responses to the effects of climate change induced challenges - notably high temperature and solar radiation, rangeland degradation, seasonal feed and water shortages and high incidences of tropical diseases. Meta-analysis using a random-effects model showed estimates of heritability and genetic correlations for reproduction and production traits. In addition, heritability and genetic-correlation estimates found in the present study suggest that there is high genetic variability for most traits in Boran cattle, and that genetic improvement is possible for all studied traits in this breed.ConclusionThe review revealed that Boran cattle exhibit better reproduction, production and adaption potentials as compared to other indigenous zebu cattle breeds in Ethiopia under low-land, poor pasture and water conditions. On other hand, the breed is currently challenged by adverse effects of climate change and other management factors such as high rate of genetic dilution, reduced rangeland productivity, lack of organized breed improvement programs and discriminate selection of gene pool. Thus, we recommend strategic breed improvement and genetic conservation program of Boran cattle breed in collaboration with Borana pastoralists through proper quantification of important traits and estimation of the pure Boran cattle population while controlled cross breeding strategy could be used in urban and peri-urban areas for maximum utilization of adapataion and production pottential of this breed.

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Crossbreeding cattle in beef production programmes in Kenya. II. Comparison of purebred Boran and Boran crossed with the Red Poll and santa gertrudis breeds

Cited by 10 publications

References 6 publications

Genetic and environmental effects on age at first calving and calving interval of naturally bred Boran (zebu) cows in Ethiopia

Genetic and environmental effects on age at first calving and calving interval of naturally bred Boran (zebu) cows in Ethiopia

Economic values for production and functional traits and assessment of their influence on genetic improvement in the Boran cattle in Kenya

Production, Reproduction and Adaptation characteristics of Boran cattle breed under changing climate: A systematic review and meta-analysis

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