Reproductive Performance and Mortality Rate in Local and Dorper × Local Crossbred Sheep Following Controlled Breeding in Ethiopia

Mesfin Lakew^1*, Mussie Haile-Melekot², Getinet Mekuriaw², Solomon Abreha³, Haimanot Setotaw³

¹Sirinka Agricultural Research Center, Woldia, Ethiopia.
²College of Agriculture and Environmental Sciences, Bahir Dar University, Bahir Dar, Ethiopia.
³College of Agriculture, Wollo University, Dessie, Ethiopia.

DOI: 10.4236/ojas.2014.45035                

Abstract

The reproductive and lamb mortality data (n = 187) of the Local and crosses of Dorper × Local ewes following natural controlled breeding in Ethiopia were analysed. Data were collected during 2009-2011 at Sirinka breeding, evaluation and distribution site, eastern Amhara region of Ethiopia. Breed, lamb sex, birth season, birth year, birth type and ewes’ parity were considered as fixed effects. Data analyses were performed using general linear model procedures. Breed was a significant source of variation: the local sheep attained faster the age at first lambing than the crossbred ewe lambs (469 ± 8.45 vs. 555 ± 6.25 days, p < 0.0001), whereas the crossbred ewes weighed more than the local sheep ewes at the age of first lambing (32.7 ± 0.63 vs. 22.8 ± 0.43 kg, p < 0.0001). Birth year had also important influence on the age and weight at first lambing of ewes. Ewes showed better performance during the later study years, differences attributed due to the improved management advantages in later years. The crossbred and local ewes were comparable in their litter size, despite the fact that the lambing interval of crossbred ewes was longer than the local ewes (306 ± 4.62 vs. 287 ± 2.38 days). Additionally, there was no significant difference in mortality rate between the two breeds. This study confirms that the local ewes had higher annual reproductive rate than that of the crossbred sheep ewes (1.49 ± 0.02 vs. 1.37 ± 0.01 lambs) under the same environmental conditions. The present results suggested that better management and breeding program probably will increase the productivity of the local sheep.

Keywords

Reproduction, Controlled Breeding, Mortality, Dorper × Local, Local Sheep, Sirinka

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	Hirpa, A. and Abebe, G. (2008) Economic Significance of Sheep and Goats. In: Yami, A. and Merkel, R.C., Eds., Sheep and Goat Production Handbook for Ethiopia, Branna Printing Enterprise, Addis Ababa, 2-24.
[2]	Gatenby, R.M. (2002) Sheep. Macmillan Education, London.
[3]	Sebsibe, A. (2008) Sheep and Goat Meat Characteristics and Quality. In: Yami, A. and Merkel, R.C., Eds., Sheep and Goat Production Handbook for Ethiopia, Branna Printing Enterprise, Addis Ababa, 325-340.
[4]	Tibbo, M. (2006) Productivity and Health of Indigenous Sheep Breeds and Crossbreds in the Central Ethiopian Highlands. Ph.D. Thesis, Swedish University of Agricultural Sciences, Uppsala.
[5]	Kosgey, I.S. and Okeyo, A.M. (2007) Genetic Improvement of Small Ruminants in Low-Input, Smallholder Production Systems: Technical and Infrastructural Issues. Small Ruminant Research, 70, 76-88. http://dx.doi.org/10.1016/j.smallrumres.2007.01.007
[6]	Hassen, Y., Sölkner, J. and Fuerst-Waltl, B. (2004) Body Weight of Awassi and Indigenous Ethiopian Sheep and Their Crosses. Small Ruminant Research, 55, 51-56. http://dx.doi.org/10.1016/j.smallrumres.2004.01.008
[7]	Gizaw, S. (2008) Sheep Resources of Ethiopia: Genetic Diversity and Breeding Strategy. Ph.D. Thesis, Wageningen University, Wageningen.
[8]	Lemma, S. (2009) Phenotypic Classification and Description of Indigenous Sheep Types in Amhara National Regional State of Ethiopia. M.Sc. Thesis, Haramaya University, Dire Dawa.
[9]	Richard, K. (2010) Dorper Sheep and the Production of Lean Lamb in Arid Australia. International Specialised Skills Institute, Melbourne.
[10]	Schoeman, S.J. (2000) A Comparative Assessment of Dorper Sheep in Different Production Environments and Systems. Small Ruminant Research, 36, 137-146. http://dx.doi.org/10.1016/S0921-4488(99)00157-1
[11]	Olivier, J.J., Marais, P.G. and Cloete, J.A.N. (1984) Evaluation of Different Breed Crosses in the Development of a White Wooled Mutton Sheep: The Afrino. South African Journal of Animal Science, 14, 105-109. http://eurekamag.com/research/005/397/005397696.php
[12]	SAS (Statistical Analysis System) (2003) Ver.9.1. SAS Institute Inc., Cary.
[13]	Ibrahim, H. (1998) Small Ruminant Production Techniques. ILRI Manual 3. ILRI (International Livestock Research Institute), Nairobi.
[14]	Gizaw, S. (2002) Genetic Evaluation of Menz and Awassi x Menz Crossbred Sheep in Ethiopia. M.Sc. Thesis, National Dairy Research Institute, Karnal.
[15]	Taye, M., Abebe, G., Lemma, S., Gizaw, S., Mekoya, A. and Tibbo, M. (2011) Reproductive Performances and Survival of Washera Sheep under Traditional Management Systems at Yilmanadensa and Quarit Districts of the Amhara National Regional State, Ethiopia. Journal of Animal Science and Veterinary Advances, 10, 1158-1165.
[16]	Mekuriaw, S. (2011) Performance Evaluation of Washera, Farta and Their Crossbred Sheep in Western Highlands of Amhara Region, Ethiopia. M.Sc. Thesis, Bahir Dar University, Bahir Dar.
[17]	Abegaz, S. (2007) In-Situ Characterization of Gumuz Sheep under Farmers’ Management in North-Western Lowlands of Amhara Region. M.Sc. Thesis, Haramaya University, Dire Dawa.
[18]	Belay, B. and Haile, A. (2009) Reproductive Performance of Traditionally Managed Sheep in the Southwestern Part of Ethiopia. Livestock Research for Rural Development, 21. http://www.Irrd.org/Irrd21/9/bela21154.htm
[19]	Gizaw, S. and Getachew, T. (2009) The Awassi x Menz Sheep Crossbreeding Project in Ethiopia: Achievements, Challenges and Lessons Learned. Proceedings of the Mid-Term Conference of the Ethiopian Sheep and Goat Productivity Improvement Program (ESGPIP), Hawassa, 13-14 March 2009, 53-62.
[20]	Gbangboche, A.B., Adamou-Ndiaye, A.K.I., Youssao, M., Farnir, F., Detilleux, J., Abiola, F.A. and Leroy, P.L. (2006) Non-Genetic Factors Affecting the Reproduction Performance, Lamb Growth and Productivity Indices of Djallonke Sheep. Small Ruminant Research, 64, 133-142. http://dx.doi.org/10.1016/j.smallrumres.2005.04.006
[21]	Abegaz, S., Duguma, G., Nigussie, E., Gelmesa, U., Terefe, F. and Rege, J.E.O. (2002) Factors Affecting Reproductive Performance and Estimates of Genetic Parameters of Litter Size in Horro Sheep. Journal of Agricultural Science, 139, 79-85. http://dx.doi.org/10.1017/S0021859602002265
[22]	Berhan, A. and Van Arendonk, J. (2006) Reproductive Performance and Mortality Rate in Menz and Horro Sheep Following Controlled Breeding in Ethiopia. Small Ruminant Research, 63, 297-303. http://dx.doi.org/10.1016/j.smallrumres.2005.03.003
[23]	Awgichew, K. (2000) Comparative Performance Evaluation of Horro and Menz Sheep of Ethiopia under Grazing and Intensive Feeding Condition. Ph.D. Dissertation, Humboldt University, Berlin.