Genetic aspects of piglet survival

Knol, E.F.; Leenhouwers, J.I.; Lende, T. van der

doi:10.1016/s0301-6226(02)00184-7

Cited by 108 publications

(129 citation statements)

References 29 publications

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“…Moreover, unlike many other studies (e.g. Leenhouwers et al, 1999 andKnol et al, 2002b;Canario et al, 2006a), individual birth weight did not appear as a major determinant of probability of stillbirth in G77 and G98 litters. This discrepancy may be partly related to the way stillborn piglets were defined.…”

Section: Discussioncontrasting

confidence: 97%

“…Fahmy and Flipot, 1981;Fraser et al, 1997;Canario et al, 2006a;Pedersen et al, 2006). Birth weight is another major component of farrowing survival (Knol et al, 2002b;Canario et al, 2006a). The experiment of Tribout et al (2003) was extended to a second generation of sows in order to investigate more thoroughly the different causes of increased pre-weaning piglet mortality and their relationships with sow maternal abilities.…”

Section: Introductionmentioning

confidence: 99%

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Estimation of genetic trends from 1977 to 1998 for farrowing characteristics in the French Large White breed using frozen semen

Canario

Rydhmer

Gogué³

et al. 2007

Animal

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The objective of the study was to estimate genetic trends from 1977 to 1998 in the French Large White (LW) breed for stillbirth and associated traits measured at farrowing using frozen semen. Two groups of pigs (G77 and G98) were obtained by inseminating LW sows with semen from LW boars born either in 1977 or in 1998. A second generation was produced by inter se mating in each group. Farrowing was thoroughly supervised through both direct observations and video recording all long farrowing on a total of 137 first-and second-parity litters produced by sows from this second generation (68 G77 and 69 G98 litters, respectively). Measurements included birth time, weight and birth characteristics (including orientation, presence of cyanosis or oedema, membrane obstruction, umbilical cord length/content) of each piglet, as well as sow traits (weight and backfat thickness, farrowing duration, litter size and within-litter variation of weights at birth). The data were analysed using linear or generalised linear mixed models, according to the definition of the trait (continuous or binary data). The importance of several effects to piglet probability of stillbirth was then quantified by computing the reduction of variance associated with the addition of each effect in the model. Litter size did not significantly differ in first parity, but was higher in G98 second-parity sows: the differences for global (including pre partum dead piglets) and total numbers of piglets born per litter were 12.3 6 1.1 and 11.3 6 0.6, respectively. G98 sows also had a higher number of stillbirths in both parities (10.7 6 0.3 stillborn per litter). Piglets from G98 litters were heavier at birth (1130 6 40 g for birth weight adjusted for litter size), without any increase in within-litter heterogeneity of birth weight. No significant difference was detected between G77 and G88 groups for farrowing length and the distribution of time interval between piglet births. G98 stillborn piglets had longer and more often empty umbilical cords at birth. G98 piglets born alive also had more often umbilical nodes than G77 piglets. These characteristics were considered as indicators of increased farrowing difficulties and risk of hypoxia at birth in G98 pigs. Time of birth of each piglet, sow fatness at farrowing and time of first placenta expulsion were the main factors of variation of the piglet's probability of stillbirth.

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Section: Discussioncontrasting

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Estimation of genetic trends from 1977 to 1998 for farrowing characteristics in the French Large White breed using frozen semen

Canario

Rydhmer

Gogué³

et al. 2007

Animal

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“…Sasaki and Koketsu (2007) showed that shorter gestation length was associated with more piglets born and dead piglets. An increase in gestation length has been related with improved piglet vitality at birth and reduced stillbirths (Knol et al, 2002). Variation in maternal ability also exists in different breeds.…”

Section: Introductionmentioning

confidence: 99%

A whole genome scan to detect quantitative trait loci for gestation length and sow maternal ability related traits in a White Duroc × Erhualian F2 resource population

Chen

Guo

Zhang

et al. 2010

Animal

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Gestation length and maternal ability are important to improve the sow reproduction efficiency and their offspring survival. To map quantitative trait loci (QTL) for gestation length and maternal ability related traits including piglet survival rate and average body weight of piglets at weaning, more than 200 F 2 sows from a White Duroc 3 Erhualian resource population were phenotyped. A genome-wide scan was performed with 194 microsatellite markers covering the whole pig genome. QTL analysis was carried out using a composite regression interval mapping method via QTL express. The results showed that total number of born piglets was significantly correlated with gestation length (r 5 20.13, P , 0.05). Three QTL were detected on pig chromosome (SSC)2, 8 and 12 for gestation length. The QTL on SSC2 achieved the 5% genome-wide significant level and the QTL on SSC8 was consistent with previous reports. Four suggestive QTL were identified for maternal ability related traits including 1 QTL for survival rate of piglets at weaning on SSC8, 3 QTL for average body weight of piglet at weaning on SSC3, 11 and 13.

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“…Sorensen and Waagepetersen [29] extended this method to obtain results under a Bayesian approach. Based on these methods, the analyses of genetic parameters for canalisation were carried out on different traits and species such as litter size in sheep [27], within-litter standard deviation of birth weight in pigs [1,2,[11][12][13], birth weight in rabbits [6] or adult weight in snails [23].…”

Section: Introductionmentioning

confidence: 99%

Genetic parameters for canalisation analysis of litter size and litter weight traits at birth in mice

et al. 2006

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-The aim of this research was to explore the genetic parameters associated with environmental variability for litter size (LS), litter weight (LW) and mean individual birth weight (IW) in mice before canalisation. The analyses were conducted on an experimental mice population designed to reduce environmental variability for LS. The analysed database included 1976 records for LW and IW and 4129 records for LS. The total number of individuals included in the analysed pedigree was 3997. Heritabilities estimated for the traits under an initial exploratory approach varied from 0.099 to 0.101 for LS, from 0.112 to 0.148 for LW and from 0.028 to 0.033 for IW. The means of the posterior distribution of the heritability under a Bayesian approach were the following: 0.10 (LS), 0.13 (LW) and 0.03 (IW). In general, the heritabilities estimated under the initial exploratory approach for the environmental variability of the analysed traits were low. Genetic correlations estimated between the trait and its variability reached values of -0.929 (LS), -0.815 (LW) and 0.969 (IW). The results presented here for the first time in mice may suggest a genetic basis for variability of the evaluated traits, thus opening the possibility to be implemented in selection schemes.canalisation / variability / mice / litter size / litter weight

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Genetic aspects of piglet survival

Cited by 108 publications

References 29 publications

Estimation of genetic trends from 1977 to 1998 for farrowing characteristics in the French Large White breed using frozen semen

Estimation of genetic trends from 1977 to 1998 for farrowing characteristics in the French Large White breed using frozen semen

A whole genome scan to detect quantitative trait loci for gestation length and sow maternal ability related traits in a White Duroc × Erhualian F2 resource population

Genetic parameters for canalisation analysis of litter size and litter weight traits at birth in mice

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