Genetic parameters and genetic trends in the Chinese × European <it>Tiameslan </it>composite pig line. II. Genetic trends
<p>Abstract</p> <p>The <it>Tiameslan </it>line was created between 1983 and 1985 by mating <it>Meishan </it>× <it>Jiaxing </it>crossbred Chinese boars with sows from the <it>Laconie </it>composite male line. The <it>Tiameslan &l...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | deu |
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BMC
2000-01-01
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| Series: | Genetics Selection Evolution |
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| Online Access: | http://www.gsejournal.org/content/32/1/57 |
| _version_ | 1818525307185922048 |
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| author | Legault Christian Burlot Thierry Bidanel Jean-Pierre Zhang Siqing Naveau Jean |
| author_facet | Legault Christian Burlot Thierry Bidanel Jean-Pierre Zhang Siqing Naveau Jean |
| author_sort | Legault Christian |
| collection | DOAJ |
| description | <p>Abstract</p> <p>The <it>Tiameslan </it>line was created between 1983 and 1985 by mating <it>Meishan </it>× <it>Jiaxing </it>crossbred Chinese boars with sows from the <it>Laconie </it>composite male line. The <it>Tiameslan </it>line has been selected since then on an index combining average backfat thickness (ABT) and days from 20 to 100 kg (DT). Direct and correlated responses to 11 years of selection were estimated using BLUP methodology applied to a multiple trait animal model. A total of 11 traits were considered, i.e.: ABT, DT, body weight at 4 (W4w), 8 (W8w) and 22 (W22w) weeks of age, teat number (TEAT), number of good teats (GTEAT), total number of piglets born (TNB), born alive (NBA) and weaned (NW) per litter, and birth to weaning survival rate (SURV). Performance data from a total of 4 881 males and 4 799 females from 1 341 litters were analysed. The models included both direct and maternal effects for ABT, W4w and W8w. Male and female performances were considered as different traits for W22w, DT and ABT. Genetic parameters estimated in another paper (Zhang et al., Genet. Sel. Evol. 32 (2000) 41-56) were used to perform the analyses. Favourable phenotypic (Δ<it>P</it>) and direct genetic trends (Δ<it>G</it><sub><it>d</it></sub>) were obtained for post-weaning growth traits and ABT. Trends for maternal effects were limited. Phenotypic and genetic trends were larger in females than in males for ABT (e.g. Δ<it>G</it><sub><it>d </it></sub>= -0.48 vs. -0.38 mm/year), were larger in males for W22w (Δ<it>G</it><sub><it>d </it></sub>= 0.90 vs. 0.58 kg/year) and were similar in both sexes for DT (Δ<it>G</it><sub><it>d </it></sub>= -0.54 vs. -0.55 day/year). Phenotypic and genetic trends were slightly favourable for W4w, W8w, TEAT and GTEAT and close to zero for reproductive traits.</p> |
| first_indexed | 2024-12-11T06:07:42Z |
| format | Article |
| id | doaj.art-699594c0382d44ed9de914fe4f5a73aa |
| institution | Directory Open Access Journal |
| issn | 0999-193X 1297-9686 |
| language | deu |
| last_indexed | 2024-12-11T06:07:42Z |
| publishDate | 2000-01-01 |
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| record_format | Article |
| series | Genetics Selection Evolution |
| spelling | doaj.art-699594c0382d44ed9de914fe4f5a73aa2022-12-22T01:18:14ZdeuBMCGenetics Selection Evolution0999-193X1297-96862000-01-01321577110.1186/1297-9686-32-1-57Genetic parameters and genetic trends in the Chinese × European <it>Tiameslan </it>composite pig line. II. Genetic trendsLegault ChristianBurlot ThierryBidanel Jean-PierreZhang SiqingNaveau Jean<p>Abstract</p> <p>The <it>Tiameslan </it>line was created between 1983 and 1985 by mating <it>Meishan </it>× <it>Jiaxing </it>crossbred Chinese boars with sows from the <it>Laconie </it>composite male line. The <it>Tiameslan </it>line has been selected since then on an index combining average backfat thickness (ABT) and days from 20 to 100 kg (DT). Direct and correlated responses to 11 years of selection were estimated using BLUP methodology applied to a multiple trait animal model. A total of 11 traits were considered, i.e.: ABT, DT, body weight at 4 (W4w), 8 (W8w) and 22 (W22w) weeks of age, teat number (TEAT), number of good teats (GTEAT), total number of piglets born (TNB), born alive (NBA) and weaned (NW) per litter, and birth to weaning survival rate (SURV). Performance data from a total of 4 881 males and 4 799 females from 1 341 litters were analysed. The models included both direct and maternal effects for ABT, W4w and W8w. Male and female performances were considered as different traits for W22w, DT and ABT. Genetic parameters estimated in another paper (Zhang et al., Genet. Sel. Evol. 32 (2000) 41-56) were used to perform the analyses. Favourable phenotypic (Δ<it>P</it>) and direct genetic trends (Δ<it>G</it><sub><it>d</it></sub>) were obtained for post-weaning growth traits and ABT. Trends for maternal effects were limited. Phenotypic and genetic trends were larger in females than in males for ABT (e.g. Δ<it>G</it><sub><it>d </it></sub>= -0.48 vs. -0.38 mm/year), were larger in males for W22w (Δ<it>G</it><sub><it>d </it></sub>= 0.90 vs. 0.58 kg/year) and were similar in both sexes for DT (Δ<it>G</it><sub><it>d </it></sub>= -0.54 vs. -0.55 day/year). Phenotypic and genetic trends were slightly favourable for W4w, W8w, TEAT and GTEAT and close to zero for reproductive traits.</p>http://www.gsejournal.org/content/32/1/57pigsgenetic trendperformance traitreproductive traitChinese breed |
| spellingShingle | Legault Christian Burlot Thierry Bidanel Jean-Pierre Zhang Siqing Naveau Jean Genetic parameters and genetic trends in the Chinese × European <it>Tiameslan </it>composite pig line. II. Genetic trends Genetics Selection Evolution pigs genetic trend performance trait reproductive trait Chinese breed |
| title | Genetic parameters and genetic trends in the Chinese × European <it>Tiameslan </it>composite pig line. II. Genetic trends |
| title_full | Genetic parameters and genetic trends in the Chinese × European <it>Tiameslan </it>composite pig line. II. Genetic trends |
| title_fullStr | Genetic parameters and genetic trends in the Chinese × European <it>Tiameslan </it>composite pig line. II. Genetic trends |
| title_full_unstemmed | Genetic parameters and genetic trends in the Chinese × European <it>Tiameslan </it>composite pig line. II. Genetic trends |
| title_short | Genetic parameters and genetic trends in the Chinese × European <it>Tiameslan </it>composite pig line. II. Genetic trends |
| title_sort | genetic parameters and genetic trends in the chinese european it tiameslan it composite pig line ii genetic trends |
| topic | pigs genetic trend performance trait reproductive trait Chinese breed |
| url | http://www.gsejournal.org/content/32/1/57 |
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