Simultaneous estimation of the covariance structure of traits from field test, station test and litter recording in pigs

Peškovičová, D.; Wolf, Jochen B. W.; Groeneveld, Eildert; Wolfová, M.

doi:10.1016/s0301-6226(02)00064-7

Cited by 23 publications

(45 citation statements)

References 25 publications

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“…The observed common environmental litter effects obtained in this study, which represent a non-genetic likeness between sibs in the same litter, were lower than literature values (Hermesch et al, 2000b;Peskovicova et al, 2002). Peskovicova et al (2002) also reported differences in the heritability estimates based on-farm test records versus on-station record.…”

Section: Discussioncontrasting

confidence: 83%

“…The heritability was higher for K5 than for K7.5, suggesting that, when selection intensity and accuracy are the same, more gain in leanness is likely to be achieved for selecting Mukota pigs using the former. Chen et al (2002) reported a heritability of 0.48 for Yorkshire, Duroc, Hampshire and Landrace breeds, while Peskovicova et al (2002) also reported a similar value in the Czech Landrace. Kanengoni et al (2004) also indicated that the positions which are used for assessing carcass grades in largeframed pigs seem inappropriate for small-framed pigs, such as the Mukota.…”

Section: Fixed Factorsmentioning

confidence: 90%

“…Peskovicova et al (2002) also reported differences in the heritability estimates based on-farm test records versus on-station record. The estimates for these two production systems in the Czech Republic were 0.18 and 0.36, respectively.…”

Section: Discussionmentioning

confidence: 99%

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Estimation of genetic parameters for growth performance and carcass traits in Mukota pigs

Chimonyo

Dzama

2007

Animal

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The objective of the study was to determine genetic parameters for growth and carcass traits in Mukota pigs, maintained on a fibrous diet. Records (n ¼ 1961) were obtained from a population housed at the University of Zimbabwe Farm (Harare, Zimbabwe) between January 1998 and August 2003. Backfat thickness was measured at 50 and 75 mm (K5 and K7.5), respectively. Carcass length (CL) was measured from the anterior edge of the first rib to the pubic bone using a measuring tape. Variance components were estimated using a model that accounted for direct, common environmental litter and maternal genetic effects, using average information restricted maximum likelihood. Heritability estimates for average daily gain from birth to weaning (ADGW) and average daily gain from weaning to 12 weeks (ADG1) were 0.15 and 0.27, respectively. Maternal genetic effects accounted for 2.6% of variation for ADG1. Heritability for average daily gain from 12 weeks to slaughter (ADG2) was 0.20. Common environmental litter effects accounted for 18% of phenotypic variance for cold dressed mass (CDM). Heritability estimates for CDM and CL were 0.32 and 0.62, respectively. Maternal genetic effects accounted for 10.5% of variance in CL. Heritability estimates for K5 and K7.5 were 0.64 and 0.40, respectively. The CDM was positively genetically correlated to K5, but negative to K7.5. The K5 and K7.5 had a high genetic correlation (0.88). Genetic correlations between ADGW and K5, K7.5 and CL were 0.30, 0.05 and 0.35, respectively. The existence of sufficient genetic variation makes genetic improvement for many growth and carcass traits in the Mukota breed possible through effective selection methods.

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Section: Discussioncontrasting

confidence: 83%

Section: Fixed Factorsmentioning

confidence: 90%

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Estimation of genetic parameters for growth performance and carcass traits in Mukota pigs

Chimonyo

Dzama

2007

Animal

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“…Value obtained on farm 2 is in concordance with values presented by Petrović et al (1998), Kim (2001) and Vuković (2003). Higher heritability coefficient value for LBP compared to result obtained in this research was reported by Peškovičova et al (2002).…”

Section: Resultscontrasting

confidence: 53%

The effect of scope of analyzed data on the value of the heritability coefficient of litter size traits in pigs

Radojković¹,

Petrović²,

Mijatovic³

et al. 2011

BIOTEC ANIM HUSB

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Low heritability of pig litter size traits at birth (number of live born piglets -LBP and total born piglets -TBP) and weaning (number of reared piglets -RP) is one of the major problems in their genetic improvement. The effect of selection is directly proportional to trait heritability and inversely proportional to the duration of generation interval. Objective of this study was to establish presence of difference in regard to heritability coefficient values of observed traits, as well as their accuracy depending on the size of data used in the analysis. Heritability coefficients in this study were calculated based on fertility results obtained for Swedish Landrace sows on three pig farms (farms 1, 2 and 3) in the Republic of Serbia. Observed traits -LBP, TBP and RP on farms 1, 2 and 3 were analyzed in the first (2422, 1677 and 2015 litters), in the first two (4190, 2897 and 3377 litters), in the first three (5576, 3809 and 4425 litters) and all available parities (9538, 6340 and 7750 litters) by applying the adequate mixed model of the Least square method. Heritability of LBP calculated based on fertility realized in the first partus ranged from 5.6 to 16.4 %, TBP ranged from 7.0 to 16.8 % and RP ranged from 3.4 to 7.7 %. Introduction into the analysis of the results pertaining to the second, third and subsequent parities lead mainly to detection of lower values of heritability coefficients for observed traits.

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“…The dominance effect was The main reason for using different models was to increase the validity of the results by excluding the chance that a certain result was caused just by a concrete model. The models were identical to a great extent with the model used for these traits in routine genetic evaluation of maternal pig breeds in the Czech Republic (Peškovičová et al, 2002). All calculations were carried out by the PEST program (Groeneveld et al, 1992).…”

Section: Methodsmentioning

confidence: 99%

Herd specific effects of the ESR gene on litter size and production traits in Czech Large White sows

Goliášová¹,

Wolf²

2004

CZECH J ANIM SCI

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ABSTRACT:The effect of PvuII polymorphism of the oestrogen receptor gene on li�er size and production traits in a Czech Large White population (882 sows, 2 455 li�ers) was evaluated. Data were analysed by four four-trait animal models. The traits analysed were lifetime average daily gain in the field test, lean meat percentage, number of piglets born alive in parity 1 and number of piglets born alive in parity 2 and subsequent parities. The animal models differed in considering the herd-year-season effect as random or fixed and in including or not including the dominance effect. For each model two variants were calculated: the ESR effects were calculated either across herds or within herds. On the genetic level, no significant overall effects of the ESR gene were detected. The effects of the ESR gene within herds were mostly insignificant as well. There was a certain tendency for allele A to increase li�er size in parity 1. Nevertheless, on the basis of the present knowledge, the use of the ESR gene for selection for li�er size in the Czech Large White breed seems to be of questionable benefit and cannot be recommended.

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Simultaneous estimation of the covariance structure of traits from field test, station test and litter recording in pigs

Cited by 23 publications

References 25 publications

Estimation of genetic parameters for growth performance and carcass traits in Mukota pigs

Estimation of genetic parameters for growth performance and carcass traits in Mukota pigs

The effect of scope of analyzed data on the value of the heritability coefficient of litter size traits in pigs

Herd specific effects of the ESR gene on litter size and production traits in Czech Large White sows

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