The Comparison of Four Economical Selection Indices for Improving the Performance of Kermani Sheep under Rural Production System
الموضوعات :
N. Kargar Borzi
1
,
M.S. Mokhtari
2
1 - بخش تحقیقات علوم دامی، مرکز تحقیقات و آموزش کشاورزی و منابع طبیعی استان کرمان، سازمان تحقیقات، آموزش و ترویج کشاورزی، کرمان، ایران
2 - Department of Animal Science, Faculty of Agriculture, University of Jiroft, Jiroft, Iran
الکلمات المفتاحية: Computer Simulation, inbreeding, genetic progress, Kermani sheep, selection criterion,
ملخص المقالة :
Developing effective selection programs for improving the performance of livestock requires taking the economical selection indices into account. The present study was performed for comparing four selection indices developed in Kermani sheep through simulated data. The relative importance of traits was determined based on the estimated economic values and consequently, the most beneficial traits were applied to develop the selection indices. The considered selection indices were different combinations of traits including ewe body weight (EBW), annual wool weight (AWW) and total weaning weight of lambs per exposed ewe (TWWEE). The first index included all three mentioned traits (EBW, AWW, and TWWEE). The second, third and fourth indices were included (AWW, TWWEE), (EBW, TWWEE) and (TWWEE), respectively. In general, the obtained results indicated that under all the developed selection indices the aggregate genotype, selection index and economic progress increased by increasing in the population size and decreasing in ram ratio, but resulted in reduced inbreeding average. In more cases, the aggregate genotype decreased by removing a trait from the index. The comparisons among indices indicated that the most suitable selection index for this breed under rural production system is the first index which included EBW, AWW, and TWWEE. This index had a maximum selection index average, aggregate genotype, and economic progress.
Agudelo-Gómez D.A., Agudelo-Trujillo J.H. and Cerón-Muñoz M.F. (2016). Selection index for meat and milk traits of buffaloes in Colombia. Livest. Sci. 191, 6-11.
Bahreini Behzadi M.R., Shahroudi F.E. and Van Vleck L.D. (2007). Estimates of genetic parameters for growth traits in Kermani sheep. J. Anim. Breed. Genet. 124, 296-307.
Bett R.C., Kosgey I.S., Kahi A.K. and Peters K.J. (2011). Definition of breeding objectives and optimum crossbreeding levels for goats in the smallholder production systems. Small Rumin. Res. 96, 16-24.
Campos G.S., Neto B.J., Oaigen R.P., Cardoso F.F., Cobuci J.A., Kern E.L., Campos L.T., Bertoli C.D. and McManus C.M. (2014). Bioeconomic model and selection indices in Aberdeen Angus cattle. J. Anim. Breed. Genet. 131, 305-312.
Conington J., Bishop S.C., Waterhouse A. and Simm G. (2004). A bioeconomic approach to derive economic values for pasture-based sheep genetic improvement programs. J. Anim. Sci. 82, 1290-1304
Falconer D.S. and Mackay T.F.C. (1996). Introduction to Quantitative Genetics. Longmans Green, Harlow, Essex, United Kingdom.
Gallivan C. (1996). Breeding objectives and selection index for genetic improvement of Canadian sheep. Ph D. Thesis. University of Guelph, Canada.
Ghiasi H., Khaldari M. and Taherkhani R. (2016). Comparison of Ordinary and restricted selection indices on genetic gain of body weight in Iranian Moghani sheep. Iranian J. Appl. Anim. Sci. 6, 369-373.
Harris D.L. (1970). Breeding for efficiency in livestock production: Defining the economic objectives. J. Anim. Sci. 30, 860-865.
Hossein-Zadeh N.G. and Ardalan M. (2008). Comparison of different models for the estimation of genetic parameters of body weight traits in Moghani sheep. Agric. Food Sci. 19, 207-213.
Kargar Borzi N., Ayatollahi Mehrgardi A., Asadi Fozi M. and Vatankhah M. (2017). Determining the appropriate selection index for Rayeni Cashmere goat under pasture-based production system. Anim. Prod. Sci. 58, 1595-1602.
Kosgey I.S., Van Arendonk K.G. and Baker R.L. (2003). Economic values for traits of meat sheep in medium to high production potential areas of the tropics. Small Rumin. Res. 50, 187-202.
Lôbo R.N.B., Pereira I.D.C., Facó O. and McManus C. (2011). Economic values for production traits of Morada Nova meat sheep in a pasture based production system in semi-arid Brazil. Small Rumin. Res. 96, 93-100.
Meyer K. (2006). WOMBAT-A Program for Mixed Model Analyses by Restricted Maximum Likelihood. User Notes. Animal Genetics and Breeding Unit, Armidale.
Mohammadabadi M., Esfandyarpoor E. and Mousapour A. (2017). Using inter simple sequence repeat multi-Loci Markers for studying genetic diversity in Kermani sheep. J. Res. Dev. 5, 154-158.
Mokhtari M.S., Rashidi A. and Mohammadi Y. (2008). Estimation of genetic parameters for postweaning traits of Kermani sheep. Small Rumin. Res. 80, 22-27.
Mokhtari M.S., Rashidi A. and Esmailizadeh A.K. (2010). Estimates of phenotypic and genetic parameters for reproductive traits in Kermani sheep. Small Rumin. Res. 88, 27-31.
Okeno T.O., Magothe T.M., Kahi A.K. and Peters K.J. (2012). Application of risk-rated profit model functions in estimation of economic values for indigenous chicken breeding, Trop. Anim. Health Prod. 44, 1279-1287.
Parish J.A., Rhinehart J.D. and Smith T. (2011). Expected Progeny Differences and Selection Indices for Beef Cattle Selection. Extension Service of Mississippi State University Publication, Mississippi, United States.
Paswan C., Gowane G.R., Prakash V., Prince L.L.L. and Kumar A. (2016). Construction of new selection criteria for Malpura sheep. Indian J. Anim. Sci. 86, 61-64.
Quinton M. and Smith C. (1995). Comparison of evaluation selection system for maximizing genetic response at the same level of inbreeding. J. Anim. Sci. 73, 2208-2212.
Rashidi A., Mokhtari M.S., Safi Jahanshahi A. and Mohammad Abadi M.R. (2008). Genetic parameter estimates of pre weaning growth traits in Kermani sheep. Small Rumin. Res. 74, 165-171.
Seidavi A.R., Bizhannia A.R., Ghanipoor M. and Qotbi A.A.A. (2008). Investigation on improvement possibility of resistance, production and reproduction traits in 3P, 2P and P generations in three Japanese pure lines of silkworm Bombyx mori, using individual selection in 3P generation. Asian J. Anim. Vet. Adv. 3, 443-447.
Snyman M.A., Olivier J.J. and Olivier W.J. (1996). Variance components and genetic parameters for body weight and fleece traits of Merino sheep in an arid environment. South African J. Anim. Sci. 26, 11-14.
Weigel K.A.) 2001(. Controlling inbreeding in modern breeding programs. J. Dairy Sci. 84, 177-184.
