The comparison of economic values and relative emphasis of some traits in Lori-Bakhtiari sheep resulted from different ways | ||
| علوم دامی | ||
| Article 7, Volume 28, Issue 106, June 2015, Pages 71-82 PDF (807.11 K) | ||
| Document Type: Research Paper | ||
| DOI: 10.22092/asj.2015.101349 | ||
| Authors | ||
| M. vatankhah* ; A. Akhondi | ||
| Abstract | ||
| In this study production, reproduction, management and economic parameters resulted from recording of 4 flocks with 600 head of breeding ewe during the annual cycle of production in village system were used to determine of the breeding objective, absolute economic values and relative emphasis for a Lori_Bakhtiari breed of sheep. To calculate the economic values of traits, the level of each trait for the flock was increased by 1 unit, while all other traits were held at their mean values and change in profit was as the absolute economic value (maximize profit, P), the ratio of revenue to costs (maximize efficiency, Q) and the ratio of costs to revenue (minimize costs,) calculated for considerable trait. To calculate the economic weight and relative emphasis, the absolute economic value of each trait multiplied to the genetic standard deviation of trait in three ways. The results showed that annual profit per ewe, the ratio of revenue to costs and the ratio of costs to revenue were 667023 rials, 1.16 and 0.86, respectively. The breeding objective for Lori-Bakhtiari sheep in village system in order of relative emphasis were reproductive traits (Litter size, conception rate, number of parturition in each year); durability traits (in lamb up to sale and ewe); growth traits (lamb weight at sale time, weight of replacement, weight of mature ewe) and greasy fleece weight. The economic values of corresponding traits resulted from various ways were different in values and the sign of economic values from P was the same as Q but different to. The sum of relative emphasis for reproductive traits, durability traits, growth traits and greasy fleece weight resulted from P were 57.09, 23.39, 19.32 and 0.19; from Q were 55.54, 22.98, 21.29 and 0.19 and from were 55.05, 23.06, 21.69 and 0.19, respectively. Thus, the relative emphasis resulted from different ways for various traits were equal relatively and if the relative emphasis is used instead of absolute economic values, the result of each different ways could apply | ||
| Keywords | ||
| Economic values; Profit function; Village system; Lori-Bakhtiari sheep | ||
| References | ||
|
Abdollahy, H., Hasani, S., Zerehdaran, S., Shadparvar, A. A. and Mahmoudi, B. (2012). Determination of economic values for some important traits in Moghani sheep. Small Rumin. Res. 105 (1-3), 161-169. Ahmadi Motaghi, A. (2002). Estimation of economic values for some important production traits in Baluchi sheep. MSc Thesis, Faculty of Agriculture, University of Mazandaran, 77 p. (In Farsi). Bagheri, M. (2002). Estimation of economic values for some important production traits in Lori-Bakhtiari sheep. MSc Thesis, Faculty of Agriculture, University of Mazandaran, 55 p. (In Farsi). Brascamp, E. W., C. Smith and J. W. James. (1985). Derivation of economic weight from profit equations. Anim. Prod. 40: 175-180.
Gallivan, C. (1996). Breeding objectives and selection index for genetic improvement of Canadian sheep. PhD Thesis, University of Guelph, 174 pp. Haghdoost, A., Shadparvar, A. A., Beigi Nasiri, M. T. and Fayazi, J. (2008). Estimates of economic values for traits of Arabic sheep in village system. Small Rumin. Res.80 (1), 91-94. Harris, D.L. (1970). Breeding for efficiency in livestock production: Defining the economic objectives. J. Anim. Sci. 30, 860-865. Kosgey, I.S., Van Arendonk, J. A. M. and Baker, R.L. (2001). Breeding objectives for meat sheep in smalholder production systems in the tropics Proc. 52nd Annual EAAP Meeting, Budatest, Hungary, 26-29 August, 1-23 Lopez-Villalobos, N. d Garrick, D. J. (2005). Methodology for the design and enhancement of genetic improvement programs illustrated in the context of the New Zealand dairy industry. Agrociencia IX, 553-568. Ponzoni, R. W. (1986). A profit equation for the definition of the breeding objective of Australian Merino sheep. J. Anim. Breed. Genet. 103, 342-357. Smith, C., James, J.W. and Brascamp, E.W. (1986). On the derivation of economic weights in livestock improvement. Anim. Prod. 43, 545-551. Vatankhah, M., Moradi Shahrebabak, M., Nejati Javaremi, A., Miraei Ashtiani, S. R. and Vaez Torshizi, R. (2009). Determination of breeding objective and economic values for Lori-Bakhtiari breed of sheep in the village system. Animal Science Research in Pajouhesh & Sazandegi, No. 82, 17-25. (In Farsi). Weller, J. (2000). Economic evaluation of straight and crossbreeding programmes. ICAR, Technical Series, No. 3. 243-277. | ||
|
Statistics Article View: 2,068 PDF Download: 1,020 |
||
Journal management system. designed by sinaweb