trypanotolerance and phenotypic characteristics of four ethiopian cattle breeds
DESCRIPTION
Presented by Jennie Stein at the ILRI-EIAR-SLU Workshop on Sharing Research Results on Trypanotolerance in Indigenous Cattle Breeds and Experiences of Community Based Breed Improvement of Indigenous Sheep in Ethiopia—A Road Map for Implementation and Future R4D, Addis Ababa, Ethiopia, 15-16 November 2011.TRANSCRIPT
Trypanotolerance and Phenotypic Characteristics of four Ethiopian Cattle Breeds
Jennie Stein
ILRI-EIAR-SLU Workshop on Sharing Research Results on Trypanotolerance in Indigenous Cattle Breeds and Experiences of Community Based Breed Improvement of Indigenous Sheep in
Ethiopia—A Road Map for Implementation and Future R4DAddis Ababa, Ethiopia, 15-16 November 2011
Distribution
Sub-Saharan Africa
60 million heads ofcattle exposed to risk
3 million heads lost annually
Costs 1.34 billion USD annually
EthiopiaTrypanosomosis covers 15 % of all arable land
10 - 14 million heads of cattle exposed to risk
Trypanotolerance
Relative capacity of an animal to control the development of the parasites and to limit their pathological effects
Natural selection
Mostly West African B. taurus
Complex trait
Photo: Emelie Zonabend
West African N´Dama
The Ghibe Valley
Non-inhabited up to mid 80-ies due to trypanosomosis
Major efforts and research by ILRI and EIAR
Now: 10,000 farming families and 25,000 heads of cattle
Trypanosomosis still a large problem in the valley
Background
Ghibe/Tolley research station – EIAR and ILRIAimed at identifying trypanotolerant cattle breed(s)
among Abigar, Gurage, Horro and Sheko
Animals of the four breeds arrived in 2000
PhD-project proposal– EIAR, ILRI and SLUTo further investigate trypanotolerance and related
traits both in home area and at the Ghibe station
Main funding from Sida/SAREC
Breeds Investigated
Horro
Abigar
Sheko
Gurage
Kept in different parts of South-Western Ethiopia
Objective
Learn about farmers’ perceptionand knowledge regarding diseases,breeding and production
Determine level of trypanosomosisof the four breeds objectively
Compare breeds in same tsetseinfested environment (Ghibe)
Alternative opportunities to explore thegenes of a possibly trypanotolerant breed
Methods I – In the Field
Interview with farmers
4 breeds in the areas wherethey are normally kept
60 interviews per breed
Contained questions regarding:
Herd size and management, utility of cattle,constraints for cattle production,production and reproduction as well as diseases with a major focus on trypanosomosis
Trypanosomosis challengeAbigar
Gurage
Horro
Sheko
Methods II – In the Field
Sampling
Performed at peak challenge period
100 animals per breed
Blood: PCV and parasitaemia
Body measurements:Body lengthHeart girthHeight at withersBody Condition Score
Methods III – On Station
All breeds kept in the same tsetse infested environment in the Ghibe Valley 2000-2007
Monthly recordingsParasitaemia
PCV
Live weight
375 animals included
PCV – Home areas
Breed Overall Non infected Infected
Abigar 20.0 20.8 17.5
Gurage 22.7 23.1 21.2
Horro 26.2 27.2 21.3
Sheko 25.1 25.4 19.5
All breeds show a lower PCV when infectedHorro and Sheko have the best PCV
PCV – Experimental station
Breed Overall Non infected Infected
Abigar 24.1 24.6 22.4
Gurage 22.5 23.7 20.3
Horro 23.0 23.7 20.4
Sheko 24.6 24.9 21.3
All breeds show a lower PCV when infectedSheko has the best PCV
PCV
All breeds showed lower PCV when infected,both in home area and on experimental station
16
18
20
22
24
26
28
30
Sep-00 Sep-01 Sep-02 Sep-03 Sep-04 Sep-05 Sep-06
Mea
n PC
V (%
)
Non-infected
Infected
Infection Rate
Sheko best in all three categories
Home areasExp.
station
Breed
Treated within 3 weeks
Not treated
Treatm. per year
Abigar 40 % 22 % 3.8 8 %
Gurage 98 % - 24.1 16 %
Horro 12 % 9 % 3.6 12 %
Sheko 9 % 47 % 1.0 5 %
Gurage in most need for treatmentsLittle need for treatments in Sheko
Trypanocidal Treatments
Survival rate – Experimental station
Breed
Purchased Born at station
No. alive % No. alive %
Abigar 32 45 6 67
Gurage 22 48 9 50
Horro 41 76 42 70
Sheko 38 57 39 78
Horro and Sheko highest survival
Age 1st mating (yrs) Calving
Intervals (yrs)
Calves born / cow
(No.)Breed Male Female
Abigar 3.3 3.0 1.1 8.8
Gurage 4.8 4.6 2.2 5.7
Horro 4.0 3.6 1.3 5.6
Sheko 3.5 3.5 1.3 8.5Gurage have the worst reproductionAbigar and Sheko best reproduction
Reproductive characteristics – home areas
Reproductive characteristics – Experimental station
Abigar least favorable
Horro and Sheko best
BreedPurchased
females (No.)Calves born
(No.)Calves per
female
Abigar 64 9 0.14
Gurage 41 18 0.44
Horro 49 60 1.22
Sheko 62 50 0.81
Milk production
Home areas Exp. station
Breed
Lactation length
(months)
EstimatedTotal milk (l/lactation)
Total milk (l/lactation)
Abigar 7.8 527 271
Gurage 6.9 158 312
Horro 7.1 326 436
Sheko 8.8 627 397
Sheko and Abigar best in home areasSheko and Horro best on station
Body Size and Live Weight
Adult animalsAbigar and Horro largest
Gurage smallest
Calves born at stationSheko and Horro largest
Gurage smallest
Live Weight – purchased animals in Ghibe
Body Condition Score
Breed Overall Non infected Infected
Abigar 2.90 2.97 2.73
Gurage 3.06 3.06 2.95
Horro 3.60 3.62 3.53
Sheko 3.40 3.41 2.92
All breeds show a lower BCS when infectedHorro and Sheko show the best BCS
Conclusions
Gurage – Overall unfavorable characteristics
Abigar – Some good attributes but high parasitemia and low reproduction
Horro – Many favorable characteristics; survival
Sheko – The most favorable characteristics
Sheko is the most trypanotolerant!
Horro has also advantages!
Papers
I. Livestock keeper perception of four indigenous cattle breeds in tsetse infested areas of Ethiopia
II. Trypanosomosis and phenotypic features of four indigenous cattle breeds in an Ethiopian field survey
III. Production, reproduction and trypanotolerance in four Ethiopian cattle breeds kept on station in a tsetse infested area
Options for conservation and dissemination of genes of best breed(s) in tse-tse areas
- facts and issues for discussion
Jan Philipsson
Summary of trypanotolerance of breeds investigated
Horro
Abigar
Sheko
Gurage
- ?
- - -
+
+ + +
• Gurage – Overall unfavorable characteristics
• Abigar – Some good attributes but high parasitemia and low reproduction
• Horro – Many favorable characteristics; survival rate
• Sheko – The most favorable characteristics, but endangered breed
Summary of trypanotolerance of the breeds
Small number remaining (~ 2400 animals) Indiscriminate crossbreeding with highland
zebu is taking place Farmers´ perceptions about the breed and its
utilities – what needs to be improved?(management, services, market, breed characteristics)
Focus on breed conservation rather than breed improvement at this stage
Conservation of the Sheko breed neccessary
• Provision and support of NS bulls in the Sheko area• Provision of AI service with Sheko semen• Community based breeding program?• Nucleus herds, where also ET might be used?• Use of sexed semen?• Testing and selection of breeding animals?
Technology options for multiplication of the pure Sheko breed ?
• Crossbreeding Sheko with less tolerant breeds - multiplication of trypanotolerant genes more important/effective than spreading the Sheko breed itself
• Massive effects necessary to have impact - many bulls and good AI availability within the Sheko area as well as in other tse-tse infested areas
Technology options for more widespread use of
the Sheko breed ?
• How to spread to new areas?
• Farmers willingness to change breed - acceptance and demand
• Capacity building
• “Spreading the word” regarding Sheko genes
More widespread use of the Sheko breed ?
• Big population and good traits; > 3 million heads
• Crossing with Sheko to produce NS bulls for further crossbreeding with e.g. Gurage
• A way of amplifying the good genes of both breeds?
• Testing for trypanotolerance when selectingbreeding stock?
• Trypanotolerance of Sheko x Horro?
• Acceptance and logistics?
Possible use of Horro?
Sheko and Horro
Research and experience show the availabilty of two breeds doing well in tse-tse infested areas
Time to implement results for improved trypano- tolerance of cattle for improved livelihood of people
How to do it needs discussion and your active involvement!