Genetic variability of age and weight  at puberty, ovulation rate and embryo  survival in gilts and relations with  production traits

Bidanel, J. P.; Legault, C.

doi:10.1051/gse:19960106

Cited by 11 publications

(21 citation statements)

References 26 publications

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“…This was particularly true for direct effects, as a single significant genetic correlation was obtained for OR with AGET. In particular, the genetic correlation between OR and ADG was close to zero, unlike the results of Young et al (1977) and Bidanel et al (1996), who reported significant positive genetic correlations between the 2 traits (0.41 and 0.20, respectively). Ruiz-Flores and Johnson (2001) reported a strong positive direct genetic correlation between birth weight and OR (0.44), but much lower values for subsequent BW and backfat thickness.…”

Section: Discussioncontrasting

confidence: 87%

“…They also obtained estimates of maternal genetic correlations with piglet BW at birth and at weaning (−0.26 and 0.11, respectively) that were very similar to those reported here. The low direct genetic correlation between most growth traits and PS is also consistent with the value obtained by Bidanel et al (1996) and the estimates between growth traits and litter size at birth reported by Ruiz-Flores and Johnson (2001). There do not seem to be any previous estimates of the maternal genetic correlations between PS and growth traits in the literature, the only related result being the strong negative estimates between growth and litter size obtained in the Nebraska experiment (Ruiz-Flores and Johnson, 2001).…”

Section: Discussionsupporting

confidence: 86%

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Correlated responses of pre- and postweaning growth and backfat thickness to six generations of selection for ovulation rate or prenatal survival in French Large White pigs

Rosendo¹,

Canario²,

Druet³

et al. 2007

Journal of Animal Science

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Correlated effects of selection for components of litter size on growth and backfat thickness were estimated using data from 3 pig lines derived from the same base population of Large White. Two lines were selected for 6 generations on either high ovulation rate at puberty (OR) or high prenatal survival corrected for ovulation rate in the first 2 parities (PS). The third line was an unselected control (C). Genetic parameters for individual piglet BW at birth (IWB); at 3 wk of age (IW3W); and at weaning (IWW); ADG from birth to weaning (ADGBW), from weaning to 10 wk of age (ADGPW), and from 25 to 90 kg of BW (ADGT); and age (AGET) and average backfat thickness (ABT) at 90 kg of BW were estimated using REML methodology applied to a multivariate animal model. In addition to fixed effects, the model included the common environment of birth litter, as well as direct and maternal additive genetic effects as random effects. Genetic trends were estimated by computing differences between OR or PS and C lines at each generation using both least squares (LS) and mixed model (MM) methodology. Average genetic trends for direct and maternal effects were computed by regressing line differences on generation number. Estimates of direct and maternal heritabilities were, respectively, 0.10, 0.12, 0.20, 0.24, and 0.41, and 0.17, 0.33, 0.32, 0.41, and 0.21 (SE = 0.03 to 0.04) for IWB, IW3W, IWW, ADGBW, and ADGPW. Genetic correlations between direct and maternal effects were moderately negative for IWB (-0.21 +/- 0.18), but larger for the 4 other traits (-0.59 to -0.74). Maternal effects were nonsignificant and were removed from the final analyses of ADGT, AGET, and ABT. Direct heritability estimates were 0.34, 0.46, and 0.21 (SE = 0.03 to 0.05) for ADGT, AGET, and ABT, respectively. Direct and maternal genetic correlations of OR with performance traits were nonsignificant, with the exception of maternal correlations with IWB (-0.28 +/- 0.13) and ADGPW (0.23 +/- 0.11) and direct correlation with AGET (-0.23 +/- 0.09). Prenatal survival also had low direct but moderate to strong maternal genetic correlations (-0.34 to -0.65) with performance traits. The only significant genetic trends were a negative maternal trend for IBW in the OR line and favorable direct trends for postweaning growth (ADGT and AGET) in both lines. Selection for components of litter size has limited effects on growth and backfat thickness, although it slightly reduces birth weight and improves postweaning growth.

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Section: Discussioncontrasting

confidence: 87%

Section: Discussionsupporting

confidence: 86%

Correlated responses of pre- and postweaning growth and backfat thickness to six generations of selection for ovulation rate or prenatal survival in French Large White pigs

Rosendo¹,

Canario²,

Druet³

et al. 2007

Journal of Animal Science

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show abstract

“…Even though prenatal survival decreases when the ovulation rate increases, there are positive phenotypic and genetic correlations between ovulation rate and litter size in European breeds (Haley and Lee, 1992;Bidanel et al, 1996). Ovulation rate can be improved through genetic selection (Cunningham et al, 1979, Bidanel et al, 1996 and through nutritional and hormonal manipulation. Ovulation is the last step of a slow and complex process of growth and maturation of the follicles.…”

Section: Introductionmentioning

confidence: 99%

Control of Folliculogenesis and Mechanisms Triggering Alterations in Ovulation Rate in the Pig

Quesnel¹,

Prunier²,

Driancourt

1998

Reprod Domestic Animals

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“…This was also confirmed in the research of Tummaruk et al (2001), Čechova and Tvrdoň (2006), and Mijatović et al (2009). Gilts reach puberty with different body composition, however puberty is initiated by metabolic signals, among which special significance for growth and differentiation of cells plays leptin and insulin-like growth factor-I (IGF-I; Bidanel et al, 1996;Barb et al, 1997;Roongsitthichai and Tummaruk, 2014). Some authors have emphasized that the traits associated with reproduction should be taken into account in the development of breeding strategies aimed at improving the fattening and slaughter traits (Kuehn et al, 2009;McPherson et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Appropriate level of gilt fatness and muscularity during insemination can improve the efficiency of piglet production

Knecht¹,

Środoń²,

Jankowska-Mąkosa³

et al. 2017

Anim Reprod

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The aim of this study was to determine the degree of fatness and muscularity of gilts with different genotypes on the basis of intravital measurements using an Aloka SSD-500 ultrasound scanner and defining the influence of these parameters on selected indicators of reproductive performance. Research was performed on 462 gilts maintained under the same production conditions. Gilts were divided into 3 groups according to genotype: 154 Landrace gilts (L), 154 Large White (LW), 154 Landrace × Large White -[L × LW]. Four selected reproductive indicators were analyzed: the number of piglets born alive (n), average piglet birth weight (kg), number of piglets weaned at 28 days (n) and the average weaned piglet weight (kg). Our results clearly show that an appropriate level of gilt fatness during insemination can contribute to significant improvements in the efficiency of piglet production. In order to increase the number of piglets born alive, the number of piglets at weaning and the masses in these periods, it is recommended insemination of L, LW and [L × LW] gilts when their backfat thickness behind the last rib 3 cm from the midline of the spine exceeds 25 mm. In the case of backfat thickness measured 8 cm from the midline of the spine, to improve the production efficiency of these gilts it is recommended to proceed to insemination, when the value of this trait exceeds 20 mm. In addition, insemination of gilts with the genotype [L × LW] should occur when the amount of LD muscle exceeds 60 mm, the width of the muscle is greater than 135 mm, and its surface is greater than 70 cm 2 .

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Genetic variability of age and weight at puberty, ovulation rate and embryo survival in gilts and relations with production traits

Abstract: 214.9 ! 1.4, 197.8 ! 3.3 and 190.1 ! 2.1 days for AFE, 116.1 ± 0.9, 102.5 ± 2.2 and 97.7 ± 1.4 kg for WFE, 14.4 ± 0.1, 13.0 0.3 and 13.9 ± 0.2 for OR and 9.6 ! 0.1, 9.6 f 0.4 and 10.5 ! 0.3 for NE in LW, LF

Cited by 11 publications

References 26 publications

Correlated responses of pre- and postweaning growth and backfat thickness to six generations of selection for ovulation rate or prenatal survival in French Large White pigs

Correlated responses of pre- and postweaning growth and backfat thickness to six generations of selection for ovulation rate or prenatal survival in French Large White pigs

Control of Folliculogenesis and Mechanisms Triggering Alterations in Ovulation Rate in the Pig

Appropriate level of gilt fatness and muscularity during insemination can improve the efficiency of piglet production

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