Simulated alternative breeding schemes for optimizing Begait goat improvement programs in Western Tigray, northern Ethiopia

Abraham, Hagos; Gizaw, Solomon; Urge, Mengistu

doi:10.1016/j.agsy.2019.102669

Cited by 3 publications

(2 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Virtually, all small ruminant (sheep and goats) crossbreeding programmes in the tropics were not successful. This is due to the incompatibility of the genotypes with the breeding objectives, management approaches of the prevailing low input production systems of the area, absence of involvement of livestock owners and stakeholders in decision‐making and ownership of the initiatives or low regard to the potential of indigenous breeds (Abraham et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

Mortality rate of Boer, Central Highland goat and their crosses in Ethiopia: Nonparametric survival analysis and piecewise exponential model

Yitagesu

Alemnew

2022

Veterinary Medicine & Sci

View full text Add to dashboard Cite

Background Analysis of survival data by linear or logistic model ignores censoring and skewness inherent in the mortality data. The objective of this study is to estimate the morbidity and mortality rates of kids and adult goats, identify important risk factors for mortality using survival analysis and summarise important causes of goat death. Methods Nonparametric survival analysis and a piecewise exponential model (PEM) were used. Results The mortality rates of kids and adult goats were 0.629 and 0.302 per animal year, respectively. The 25th, 50th and 75th percentiles of survival time of kids were 5, 162 and 1300 days, respectively, and those of adults and goats were 280, 828 and 1,735 days, respectively. Gastrointestinal‐related diseases, pneumonia, weak kid, agalactia, mismothering and heartwater (cowdriosis) were the most important causes of mortality. Constant piecewise exponential regression analysis of risk factors indicated that breed, kid birth weight, doe post‐partum weight (PPWT), birth type, birth year and precipitation variables were associated with (p‐value < 0.05) kid mortality rate. Pure Boer kids compared with Central Highland goat cross with Boer goats were 2.505 times at a higher probability of mortality (p‐value < 0.001). A 1‐kg increase in kid birth weight and dam PPWT reduces mortality probability by 32.5% (p‐value = 0.000) and 6.4% (p‐value < 0.001), respectively. Twin birth kids had a 1.512 times higher rate of mortality (p‐value = 0.001) than single‐born kids. A 1‐ml increment of 15 days of average precipitation significantly reduced kid mortality by 7.8% (p‐value < 0.001). Conclusion Vaccination, extensive control of ticks and the use of proper comfortable housing to reduce the stress of goats are recommended. Scheduling a mating programme (May to early July) to match the kidding period to the less kid mortality seasons (end of the long rainy season) of flocks is also important to reduce kid mortality.

show abstract

Section: Introductionmentioning

confidence: 99%

Mortality rate of Boer, Central Highland goat and their crosses in Ethiopia: Nonparametric survival analysis and piecewise exponential model

Yitagesu

Alemnew

2022

Veterinary Medicine & Sci

View full text Add to dashboard Cite

show abstract

“…Normally, many small ruminants (sheep and goats) cross breeding programs in tropics were not successful. This is due to the incompatibility of the genotypes with the breeding objectives, management approaches of the prevailing low input production systems of the area, absence of involvement of livestock owners and stakeholders in decision making and ownership of the initiatives or low regard to the potential of indigenous breed (Abraham et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Morbidity and Mortality Rates of Boer and Central Highland Goats at Ataye Crossbreeding Program Research Site: Non-parametric Survival Analysis and Piecewise Exponential Model

Yitagesu

Alemnew

2021

Preprint

View full text Add to dashboard Cite

Non-parametric survival analysis and piecewise exponential model (PEM) was used to estimate prevalence and incidence of goat mortality, to identify major clinical causes of morbidity and mortality related disease, and to investigate animal and environmental related risk factors affecting goat mortality at Ataye boer goat breeding and evaluation research site. A total of 671 kids and 347 adult (yearling) age goats were used for the analysis of non-parametric survival and piecewise exponential model for survival, mortality incidence rate and causes of morbidity and mortality analysis. The mortality incidence rate of kids and adult goats were 0.638 and 0.302 per animal year respectively. The 25th, 50th and 75th percentile of survival time of kids were 5, 157 and 1,274 days respectively and of adult goats were 280, 828 and 1,557 days respectively. The present mortality rate is relatively larger than reports of boer cross breeding and evaluation research sites in Ethiopia as well as goat mortality prevalence abroad. Gastro-intestinal related diseases, pneumonia, weak kid, agalactia, mismothering and hear water (cowdriosis) were most important causes of mortality. Constant piecewise exponential regression analysis of risk factors indicates that breed, kid birth weight (BWT), doe post-partum weight (PPWT), birth type, birth year and precipitation variables were associated with (p-value < 0.05) kid mortality rate. Pure boer kids compared with CHG cross boer goat, are 2.505 times at higher probability of mortality (p ≤ 0.001). A 1 kilo gram increase of kid birth weight and dam PPWT reduces mortality probability by 32.5% (p-value ≤ 0.001) and 6.4% (p-value ≤ 0.001) respectively. Twin birth kids are1.512 times higher rate of mortality (p-value = 0.001) compared with single born kids. A one-millilitre increment of 15 days average precipitation significantly reduces kid mortality by 7.8% (p-value ≤ 0.001). Fleshing of does during early meeting to improve the post-partum weight of does and kids is also important to reduce both kid and doe mortality at and after kidding. Immunization of new introduced and kids to common endemic diseases in the area, extensive control of ticks to breakdown heart water transmission and use of proper comfortable housing to reduce stress of goats is recommended. Improving nutrition particularly during scarce grazing and browsing feed availability is important to improving the health and reducing mortality of goats in intensively managed goat farms.

show abstract

Towards understanding the type and function of indigenous goats: input for genetic improvement and conservation programme

Assefa,

Alemayehu,

Tesema

2023

Journal of Applied Animal Research

View full text Add to dashboard Cite

Simulated alternative breeding schemes for optimizing Begait goat improvement programs in Western Tigray, northern Ethiopia

Cited by 3 publications

References 11 publications

Mortality rate of Boer, Central Highland goat and their crosses in Ethiopia: Nonparametric survival analysis and piecewise exponential model

Mortality rate of Boer, Central Highland goat and their crosses in Ethiopia: Nonparametric survival analysis and piecewise exponential model

Morbidity and Mortality Rates of Boer and Central Highland Goats at Ataye Crossbreeding Program Research Site: Non-parametric Survival Analysis and Piecewise Exponential Model

Towards understanding the type and function of indigenous goats: input for genetic improvement and conservation programme

Contact Info

Product

Resources

About