110 likes | 344 Views
About the breed. Found across the hills and inner valleys Represents 56 % of the total goat populationHighly prolific and good for meat productionHardy and well adapted to local environmentHave greater reproductive rate (higher litter size and short kidding interval)Seasonal breeders an
E N D
1. Genetic gain in selected herds of Khari goats over generations in Nepal
Rupak Khadka
European Master in Animal Breeding and Genetics
Swedish University of Agricultural Sciences, Sweden Christian-Albrechts University, Germany
2. About the breed Found across the hills and inner valleys
Represents 56 % of the total goat population
Highly prolific and good for meat production
Hardy and well adapted to local environment
Have greater reproductive rate (higher litter size and short kidding interval)
Seasonal breeders and come into heat twice a year
Relatively small body size & weight from 20 to 40 kg
No cross breeding
3. Selection Process
Simple Index was used
Selection Criteria:
# Weaning weight of kids
# Number of kids born per kidding
# Six months weight for both sire and dam lines
4. Characteristics of the Nucleus flock Nucleus Flock:
120 dams and 15 bucks
Replacement:
Bucks 100% every two years
Dams 20 dams annually
Selection:
Males 15/100 kids & remain until 2 years
Females 25/100 kids & remain up to 6th parity
5. Dissemination Schemes Open Nucleus Breeding Scheme
Year 1 Year 2
6. Monitoring of genetic gain Annual Genetic Gain:
?G = R x i x s
L
?G = genetic gain per year
R = accuracy of selection
i = intensity of selection
s = genetic standard deviation
L= generation interval
7.
On Station
Parameters 4 month 6 month 9 month 1 year
R (%) 2.3 2.9 3.3 4.4
?G (%) 0.8 1.1 1.2 2.0
L (Yr) 2.75
On Farm
Parameters 4 month 6 month
R (%) 6.8 7.4
?G (%) 1.5 1.54
L (Yr) 4.5
Monitoring of genetic gain
8. Table 1: Heritability estimates
Parameters Heritability
Birth weight Moderate to high (0.22 -0.53)
Litter size Low (0.03)
Litter weight Moderate (0.21)
Table 2: Genetic & Phenotypic correlation among body weights
Parameters Birth wt Wean wt 6 month wt 48wk wt
Birth wt 0.59±0.237 0.85±0.195 0.02±0.328
Wean wt 0.43 0.87±0.125 0.74±0.224
6 month wt 0.51 0.83 0.84±0.188
48 week wt 0.27 0.65 0.74
Source: Neopane (2000) Genetic parameters of production traits
9. Farmer’s Response
Productivity increased through selection
Use of bucks from the nucleus flock
Avoid negative selection
Adopt improved management practices
Understand the importance of using quality bucks
Identification of traits of interest like coat color and horn type
10. Conclusion Highly prolific breed of goat with twinning and triplets
Traits of Interest: Birth weight, weaning weight, litter weights, litter size, milk yield, kidding interval
Selection following open nucleus breeding scheme is very effective in weight traits
Crossbreeding of Khari goat has been stopped
Implementation of such programme has been adopted by Department of Livestock Services and Non-governmental organizations for Khari breeds across the hills of country
Artificial Insemination programme can be launched
11. Acknowledgement Dr. Shreeram Prasad Neopane and Prakash Kumar Pokharel, Nepal Agricultural Research Council, Nepal
Prof. Dr. Jan Philipsson and Birgitta Malmfors, Swedish University of Agricultural Sciences, Uppsala, Sweden
European Master in Animal Breeding and Genetics Consortium, Wageningen University, Netherlands