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Impact of production strategies and animal performance on economic values of dairy sheep traits

Published online by Cambridge University Press:  26 September 2011

Z. Krupová ,
M. Wolfová ,
E. Krupa ,
M. Oravcová ,
J. Daňo ,
J. Huba  and
P. Polák
Z. Krupová*
Affiliation:
Animal Production Research Centre Nitra, Hlohovecká 2, SK-951 41 Lužianky, Slovak Republic
M. Wolfová
Affiliation:
Institute of Animal Science, PO Box 1, 104 01 Prague, Czech Republic
E. Krupa
Affiliation:
Animal Production Research Centre Nitra, Hlohovecká 2, SK-951 41 Lužianky, Slovak Republic
M. Oravcová
Affiliation:
Animal Production Research Centre Nitra, Hlohovecká 2, SK-951 41 Lužianky, Slovak Republic
J. Daňo
Affiliation:
Animal Production Research Centre Nitra, Hlohovecká 2, SK-951 41 Lužianky, Slovak Republic
J. Huba
Affiliation:
Animal Production Research Centre Nitra, Hlohovecká 2, SK-951 41 Lužianky, Slovak Republic
P. Polák
Affiliation:
Animal Production Research Centre Nitra, Hlohovecká 2, SK-951 41 Lužianky, Slovak Republic
*
†E-mail: [email protected]
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Abstract

The objective of this study was to carry out a sensitivity analysis on the impact of various production strategies and performance levels on the relative economic values (REVs) of traits in dairy sheep. A bio-economic model implemented in the program package ECOWEIGHT was used to simulate the profit function for a semi-extensive production system with the Slovak multi-purpose breed Improved Valachian and to calculate the REV of 14 production and functional traits. The following production strategies were analysed: differing proportions of milk processed to cheese, customary weaning and early weaning of lambs with immediate sale or sale after artificial rearing, seasonal lambing in winter and aseasonal lambing in autumn. Results of the sensitivity analysis are presented in detail for the four economically most important traits: 150 days milk yield, conception rate of ewes, litter size and ewe productive lifetime. Impacts of the differences in the mean value of each of these four traits on REVs of all other traits were also examined. Simulated changes in the production circumstances had a higher impact on the REV for milk yield than on REVs of the other traits investigated. The proportion of milk processed to cheese, weaning management strategy for lambs and level of milk yield were the main factors influencing the REV of milk yield. The REVs for conception rate of ewes were highly sensitive to the current mean level of the trait. The REV of ewe productive lifetime was most sensitive to variation in ewe conception rate, and the REV of litter size was most affected by weaning strategy for lambs. On the basis of the results of sensitivity analyses, it is recommended that economic values of traits for the overall breeding objective for dairy sheep be calculated as the weighted average of the economic values obtained for the most common production strategies of Slovak dairy sheep farms and that economic values be adjusted after substantial changes in performance levels of the traits.

Keywords

sensitivity analysisproduction traitsfunctional traitsImproved Valachian sheep breed
Type
Full Paper
Information
animal , Volume 6 , Issue 3: 61th EAAP Annual Meeting, 2010, Heraklion, Greece: 10th International Workshop on Biology of Lactation in Farm Animals (BOLFA) and Session “Evolution of mammary gland and milk secretion: consequences for lactation in farm animals” , 27 January 2012 , pp. 440 - 448
Copyright
Copyright © The Animal Consortium 2011

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References

Albera, A, Carnier, P, Groen, AF 2004. Definition of a breeding goal for the Piemontese breed: economic and biological values and their sensitivity to production circumstances. Livestock Production Science 89, 67–78.CrossRefGoogle Scholar
Amer, PR, McEwan, JC, Dodds, KG, Davis, GH 1999. Economic values for ewe prolificacy and lamb survival in New Zealand sheep. Livestock Production Science 58, 75–90.CrossRefGoogle Scholar
Byrne, TJ, Amer, PR, Fennessy, PF, Cromie, AR, Keady, TWJ, Hanrahan, JP, McHugh, MP, Wickham, BW 2010. Breeding objectives for sheep in Ireland: a bio-economic approach. Livestock Science 132, 135–144.CrossRefGoogle Scholar
Cloete, SWP, Misztal, I, Olivier, JJ 2009. Genetic parameters and trends for lamb survival and birth weight in a Merino flock divergently selected for multiple rearing ability. Journal of Animal Science 87, 2196–2208.CrossRefGoogle Scholar
Conington, J, Bishop, SC, Waterhouse, A, Simm, G 2004. A bioeconomic approach to derive economic values for pasture-based sheep genetic improvement programs. Journal of Animal Science 82, 1290–1304.CrossRefGoogle ScholarPubMed
Dempster, ER, Lerner, IM 1950. Heritability of threshold characters. Genetics 35, 212–236.CrossRefGoogle ScholarPubMed
Fuerst-Waltl, B, Baumung, R 2009. Economic values for performance and functional traits in dairy sheep. Italian Journal of Animal Science 8, 341–357.CrossRefGoogle Scholar
Haghdoost, A, Shadparvar, AA, Nasiri, MTB, Fayazi, J 2008. Estimates of economic values for traits of Arabic sheep in village system. Small Ruminant Research 80, 91–94.CrossRefGoogle Scholar
Jones, HE, Amer, PR, Lewis, RM, Emmans, GC 2004. Economic values for changes in carcass lean and fat weights at a fixed age for terminal sire breeds of sheep in the UK. Livestock Production Science 89, 1–17.CrossRefGoogle Scholar
Kosgey, IS, van Arendonk, JAM, Baker, RL 2003. Economic values for traits of meat sheep in mediumto high production potential areas of the tropics. Small Ruminant Research 50, 187–202.CrossRefGoogle Scholar
Krupová, Z, Wolfová, M, Wolf, J, Oravcová, M, Margetín, M, Peškovičová, D, Krupa, E, Daňo, J 2009. Economic values for dairy sheep breeds in Slovakia. Asian Australasian Journal of Animal Science 22, 1693–1702.CrossRefGoogle Scholar
Legarra, A, Ramón, M, Ugarte, E, Pérez-Guzmán, MD 2007. Economic weights of fertility, prolificacy, milk yield and longevity in dairy sheep. Animal 1, 193–203.CrossRefGoogle ScholarPubMed
Olivier, WJ, Snyman, MA, van Wyk, JB, Erasmus, GJ 1998. Genetic parameter estimates for fitness traits in South African Merino sheep. Livestock Production Science 56, 71–77.CrossRefGoogle Scholar
Oravcová, M, Groeneveld, E, Kovač, M, Peškovičová, D, Margetín, M 2005. Estimation of genetic and environmental parameters of milk production traits in Slovak purebred sheep using test-day model. Small Ruminant Research 56, 113–120.CrossRefGoogle Scholar
Phocas, F, Bloch, C, Chapelle, P, Bécherel, F, Renand, G, Ménissier, F 1998. Developing a breeding objective for a French purebred beef cattle selection programme. Livestock Production Science 57, 49–65.CrossRefGoogle Scholar
Safari, A, Fogarty, NM 2003. Genetic parameters for sheep production traits: estimates from the literature. Technical Bulletin 49, NSW Agriculture, Orange, Australia, 98pp.Google Scholar
Vargas, B, Groen, AF, Herrero, M, van Arendonk, JAM 2002. Economic values for production and functional traits in Holstein cattle of Costa Rica. Livestock Production Science 75, 101–116.CrossRefGoogle Scholar
Visscher, PM, Bowman, PJ, Goddard, ME 1994. Breeding objectives for pasture based dairy production systems. Livestock Production Science 40, 123–137.CrossRefGoogle Scholar
Willham, RL 1972. The role of maternal effects in animal breeding: III. Biometrical aspects of maternal effects in animals. Journal of Animal Science 35, 1288–1293.CrossRefGoogle Scholar
Wolf, J, Wolfová, M, Krupová, Z, Krupa, E 2010. User's manual for the program package ECOWEIGHT (C programs for calculating economic weights in livestock), version 5.0.2. Part 2: Program EWSH1 for Sheep, version 1.1.6. Institute of Animal Science, Prague. Retrieved April 7, 2011, from http://www.vuzv.cz/index.php?p=ecoweight&site=GenetikaSlechteniGoogle Scholar
Wolfová, M, Přibyl, J, Wolf, J 2001. Economic weights for production and functional traits of Czech dairy cattle breeds. Czech Journal of Animal Science 46, 421–432.Google Scholar
Wolfová, M, Wolf, J, Milerski, M 2011. Economic weights of production and functional traits for Merinolandschaf, Romney, Romanov and Sumavska sheep in the Czech Republic. Small Ruminant Research 99, 25–33.CrossRefGoogle Scholar
Wolfová, M, Wolf, J, Krupová, Z, Kica, J 2009. Estimation of economic values for traits of dairy sheep: I. Model development. Journal of Dairy Science 92, 2183–2194.CrossRefGoogle ScholarPubMed