Economic weights for production and reproduction traits of pigs in the Czech Republic

Houška, L.; Wolfová, M.; Fiedler, J.

doi:10.1016/s0301-6226(03)00128-3

Cited by 28 publications

(31 citation statements)

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Section: Definition Of Traits Characterising Repeated Animal Performancementioning

confidence: 99%

Section: Definition Of Traits Characterising the Growth Potential Of mentioning

confidence: 99%

“…De Vries (1989) divided the growth period of pigs into three stages, assumed linear growth within each segment (growth of piglets till weaning, in rearing and during fattening) and considered mature weight of sows to be a separate trait. These same growth periods were utilised by Houška et al (2004), but they defined weight gain from birth to slaughter as the only growth trait in the breeding objective for pigs.The EVs of growth rate in a specific time period can easily be converted to EVs for alternative traits to characterise growth ability, for example, animal weight at a certain age or animal age at a fixed weight (Coopman et al, 1999;Bett et al, 2007;Byrne et al, 2010;Houška et al, 2010).As shown in this section, growth ability of animals can be described by many different traits. The approaches and assumptions used for the calculation of the EV for a specific growth trait (in particular for mature weight) by different authors are highly variable, having a material impact on the EV of this trait.…”

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confidence: 99%

“…Similarly, Shalev and Pasternak (1999) defined egg production for geese as the average annual egg number. Houška et al (2004) characterised sow fertility by conception rates averaged over all reproductive cycles, but distinguished conception rates after the first, second and third inseminations.Treating repeated performance as repeated expressions of the same trait In more recent papers, repeated animal performances have been assumed to be only different expressions of the same trait. When calculating the EV for such a trait, the average values of all repeated trait expressions were changed simultaneously.…”

mentioning

confidence: 99%

“…For conception rate, the reference trait was the value obtained for a single insemination at the 2nd month of the first lactation. Houška et al (2004) chose the number of piglets born alive in the first farrowing as reference trait for litter size and applied multiplicative factors for higher parities.Referring the EV of a repeatedly expressed trait to one unit of a reference quantity could be appropriate in situations where breeding value estimation for such a trait is also based on a specific trait definition, for example, on 305-day milk yield in the first lactation only or on conception rate of females after the first insemination. …”

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Strategies for defining traits when calculating economic values for livestock breeding: a review

Wolfová

Wolf

2013

Animal

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The objective of the present review was (i) to survey different approaches for choosing the complex of traits for which economic values (EVs) are calculated, (ii) to call attention to the proper definition of traits and (iii) to discuss the manner and extent to which relationships among traits have been considered in the calculation of EVs. For this purpose, papers dealing with the estimation of EVs of traits in livestock were reviewed. The most important reasons for incompatibility of EVs for similar traits estimated in different countries and by different authors were found to be inconsistencies in trait definitions and in assumptions being made about relationships among traits. An important problem identified was how to choose the most appropriate criterion to characterise production or functional ability for a particular class of animals. Accordingly, the review covered the following three topics: (i) which trait(s) would best characterise the growth ability of an animal; (ii) how to define traits expressed repeatedly in subsequent reproductive cycles of breeding females and (iii) how to deal with traits that differ in average value between sexes or among animal groups. Various approaches that have been used to solve these problems were discussed. Furthermore, the manner in which diverse authors chose one or more traits from a group of alternatives for describing a specific biological potential were reviewed and commented on. The consequences of including or excluding relationships among economically important traits when estimating the EV for a specific trait were also examined. An important conclusion of the review is that, for a better comparability and interpretability of estimated EVs in the literature, it is desirable that clear and unique definitions of the traits, complete information on assumptions used in analytical models and details on interrelationships between traits are documented. Furthermore, the method and the model used for the genetic evaluation of specific traits in a certain breeding organisation are important for the exact definition of traits, for which the economic values will be calculated, and for the inclusion or exclusion of relationships among traits in the calculation of the EVs in livestock breeding. Keywords: livestock, economic values, definition of traits, relationships among traits ImplicationsA literature review was conducted on different ways of defining traits and considering relationships among them in the calculation of economic values (EVs) in livestock breeding. Diversity among trait definitions makes it difficult to compare EVs from different investigations and individual authors. It was shown that, for the EV of a trait to be correctly interpreted, it is necessary to know exactly how the trait was defined, how its relationships with other traits were accounted for and what assumptions were made in the model for the calculation of EVs. IntroductionHazel (1943) proposed the breeding objective or aggregate genotype of an animal to be defined as 'the sum of its sever...

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Section: Definition Of Traits Characterising Repeated Animal Performancementioning

confidence: 99%

Section: Definition Of Traits Characterising the Growth Potential Of mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Strategies for defining traits when calculating economic values for livestock breeding: a review

Wolfová

Wolf

2013

Animal

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Impact of Swine Reproductive Technologies on Pig and Global Food Production

Knox

2013

Advances in Experimental Medicine and Biology

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Reproductive technologies have dramatically changed the way pigs are raised for pork production in developed and developing countries. This has involved such areas as pigs produced/sow, more consistent pig flow to market, pig growth rate and feed efficiency, carcass yield and quality, labor efficiency, and pig health. Some reproductive technologies are in widespread use for commercial pork operations [Riesenbeck, Reprod Domest Anim 46:1-3, 2011] while others are in limited use in specific segments of the industry [Knox, Reprod Domest Anim 46:4-6, 2011]. Significant changes in the efficiency of pork production have occurred as a direct result of the use of reproductive technologies that were intended to improve the transfer of genes important for food production [Gerrits et al., Theriogenology 63:283-299, 2005]. While some technologies focused on the efficiency of gene transfer, others addressed fertility and labor issues. Among livestock species, pig reproductive efficiency appears to have achieved exceptionally high rates of performance (PigCHAMP 2011) [Benchmark 2011, Ames, IA, 12-16]. From the maternal side, this includes pigs born per litter, farrowing rate, as well as litters per sow per year. On the male side, boar fertility, sperm production, and sows served per sire have improved as well [Knox et al., Theriogenology, 70:1202-1208, 2008]. These shifts in the efficiency of swine fertility have resulted in the modern pig as one of the most efficient livestock species for global food production. These reproductive changes have predominantly occurred in developed countries, but data suggests transfer and adoption of these in developing countries as well (FAO STAT 2009; FAS 2006) [World pig meat production: food and agriculture organization of the United Nations, 2009; FAS, 2006) Worldwide Pork Production, 2006]. Technological advancements in swine reproduction have had profound effects on industry structure, production, efficiency, quality, and profitability. In all cases, the adoption of these technologies has aided in the creation of a sustainable supply of safe and affordable pork for consumers around the world [den Hartog, Adv Pork Prod 15:17-24, 2004].

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Introducing the Study of Lean and Value-Based Management

Kaufmann

2020

Contributions to Management Science

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Economic weights for production and reproduction traits of pigs in the Czech Republic

Cited by 28 publications

References 10 publications

Strategies for defining traits when calculating economic values for livestock breeding: a review

Strategies for defining traits when calculating economic values for livestock breeding: a review

Impact of Swine Reproductive Technologies on Pig and Global Food Production

Introducing the Study of Lean and Value-Based Management

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