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                <forename type="first">Jean Pierre</forename>
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            <idno type="halRefHtml">&lt;i&gt;Genetics Selection Evolution&lt;/i&gt;, 1990, 22 (4), pp.431-445. &lt;a target="_blank" href="https://dx.doi.org/10.1186/1297-9686-22-4-431"&gt;&amp;#x27E8;10.1186/1297-9686-22-4-431&amp;#x27E9;&lt;/a&gt;</idno>
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                <title xml:lang="en">Estimation of crossbreeding parameters between Large White and Meishan porcine breeds. II : Growth before weaning and growth of females during the growing and reproductive periods</title>
                <title xml:lang="fr">Estimation des parametres du croisement entre les races porcines Large White et Meishan. 2 : croissance avant sevrage et croissance des femelles pendant les periodes de croissance et de reproduction</title>
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                <title level="j">Genetics Selection Evolution</title>
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                <term xml:lang="en">race chinoise</term>
                <term xml:lang="en">growth</term>
                <term xml:lang="en">Chinese breed</term>
                <term xml:lang="en">crossbreeding parameter</term>
                <term xml:lang="en">pig</term>
                <term xml:lang="fr">croissance</term>
                <term xml:lang="fr">paramètres du croisement</term>
                <term xml:lang="fr">porcin</term>
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              <classCode scheme="vocinrae-old" n="porcin">porcin</classCode>
              <classCode scheme="vocinrae-old" n="race porcine chinoise">race porcine chinoise</classCode>
              <classCode scheme="vocinrae-old" n="croissance">croissance</classCode>
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              <p>A crossbreeding experiment using Large White (LW) and Meishan (MS) pig strains was conducted. Direct, maternal and grand-maternal additive genetic effects together with direct, maternal and paternal heterosis effects were estimated for traits during the preweaning, growing and reproductive periods. Weight at birth (WB) and at 21 d of age (W21) was recorded in 3731 male and female piglets. After weaning at 28 d, 543 females were weighed at 73 (W73) and 154 (W154) d of age. From these, 148 sows were weighed before farrowing from 1st to 5th parity. Average daily gains were computed from birth to 21 days of age (ADG 0-21), 21 to 73 days of age (ADG 21-73) and 73 to 154 days of age (ADG 73-154). The genetic influence on preweaning traits was mainly maternal in origin. Maternal additive differences between breeds significantly increased with parity of the dam. Average values were 0.33 ± 0.05 kg (26%) and 1.24 ± 0.22 kg (26%) in favour of LW for WB and W21 respectively. Maternal heterosis effects were 0.05 ± 0.02 kg (6%) for WB and 0.65 ± 0.09 kg (14%) for W21. Significant grand-maternal additive and direct heterosis effects were also observed on WB. Adjustment of data for litter size slightly increased additive and heterosis maternal values. After weaning, direct effects became important. Additive differences between breeds rapidly increased during the growing period and averaged 4.1 ± 1.0 kg (18%), 22.9 ± 3.3 kg (36%) and 231 ± 33 g/d (47%) in favour of LW for W73, W154 and ADG 73-154 respectively. Direct heterosis effects for these traits were 3.7 ± 0.7 kg (15%), 19.2 ± 2.3 kg (25%) and 187 ± 24 g/d (30%) respectively. Direct additive differences in favour of LW increased from 58 ± 9 kg at the first farrowing to 111 ± 10 kg at the fifth one. Direct heterosis effects were similar throughout reproductive life and averaged 27 ± 3 kg (11%). The other crossbreeding parameters were small and non-significant after weaning, with the exception of maternal heterosis effects, which remained significant until 154 days.</p>
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              <p>Une expérience de croisement entre des lignées Large White (LW) et Meishan (MS) a été réalisée. Les effets génétiques additifs directs, maternels, grand-maternels ainsi que les effets d’hétérosis directs, maternels et paternels ont été estimés pour les caractères de croissance au cours des périodes d’allaitement, de croissance et de reproduction. Les poids à la naissance (PN) et à 21 j (P21) ont été mesurés sur 3731 porcelets mâles et femelles. Après sevrage à 28 j, 543 femelles ont été pesées à 73 (P73) et 154 (P 154) j d’âge. Cent quarante-huit d’entre elles ont ensuite été pesées avant mise bas de la 1er à la 5e portée. Les gains moyens quotidiens ont été calculés entre la naissance et 21 j d’âge (GMQ 0-21), 21 et 73 j d’âge (GMQ 21-73) et de 73 à 154 j d’âge (GMQ 73-154). La variabilité génétique des performances avant sevrage était essentiellement d’origine maternelle. Les différences additives maternelles entre races augmentaient de façon significative avec le numéro de portée. Elles s’élevaient en moyenne à 0,33 ± 0,05 kg (26%) et 1,24 ± 0,22 kg (26%) en faveur de LW pour PN et P21 respectivement. Les effets d’hétérosis maternel s’élevaient à 0,05 ± 0,02 kg (6%) pour PN et 0,65 ± 0,09 kg (14%) pour P21. Des effets grand-maternels et d’hétérosis direct significatifs ont également été observés sur PN. L’ajustement des données pour la taille de la portée a légèrement accru les valeurs des effets additifs et d’hétérosis maternel. Après le sevrage, les effets directs devenaient importants. Les différences additives directes entre races ont augmenté rapidement au cours de la croissance après sevrage et atteignaient 4,1 ± 1,0 kg (18%), 22,9 ± 3,3 kg (36%) et 231 ± 33 g/j (47%) en faveur de LW pour W73, W154 et GMQ 73-154 respectivement. Les effets d’hétérosis directs pour ces caractères s’élevaient à 3,7± 0,7 kg (15%); 19,2 ± 2,3 kg (25%) et 187 ± 24g/j (30%)respectivement. Les différences additives directes en faveur de LW ont augmenté de 58 ± 9 kg à la première mise bas à 111 ± 10 kg à la cinquième mise bas. Les effets d’hétérosis directs sont restés similaires tout au long de la période de reproduction et atteignaient en moyenne 27 ± 3 kg (11 %). Les autres paramètres du croisement étaient faibles et non significatifs après le sevrage, à l’exception des effets d’hétérosis maternels, qui subsistaient jusqu’à 154 j.</p>
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