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| 2. |
- Wallenbeck, Anna, et al.
(författare)
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Avel för ekologisk anpassning
- 2009
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Ingår i: Ekologiskt lantbruk (Uppsala. 1992). - 1102-6758. ; , s. 10-11
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 4. |
- Wallenbeck, Anna, et al.
(författare)
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GxE interactions for growth and carcass leanness: Re-ranking of boars in organic and conventional pig production
- 2009
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Ingår i: Livestock Science. - : Elsevier BV. - 1871-1413 .- 1878-0490. ; 123, s. 154-160
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Tidskriftsartikel (refereegranskat)abstract
- The objective of this study was to evaluate genotype by environment interactions for growth rate and carcass leanness in organic and conventional pig production environments. Organic breeding values for fattening traits were estimated for 37 Hampshire Al-boars based on slaughter records registered for 1805 crossbred offspring raised in an organic environment. The offspring were born and raised in herds certified for organic production. The statistical model included the fixed effects of sex, litter size at 2 weeks and herd. It also included the random effects of herd-year-season, birth litter and animal. Conventional breeding values for the same boars were captured from the breeding organization's genetic evaluation. In the organic environment h(2) was estimated to 0.30 and 0.37 for growth rate and carcass leanness, respectively (r(g)=-0.11). Spearman rank correlations between organic and conventional breeding values, based on 29 boars with >= 20 progenies, were 0.48 for growth rate and 0.42 for carcass leanness. Both correlations were significantly different from 0 and 1. In conclusion, the results of the present study indicate weak genotype by environment interactions for both growth rate and carcass leanness in organic and conventional pig production environments, and there is some re-ranking of boars' breeding values between environments. (C) 2008 Elsevier B.V. All rights reserved.
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| 8. |
- Wallenbeck, Anna, et al.
(författare)
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Sow performance and maternal behaviour in organic and conventional herds
- 2009
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Ingår i: Acta Agriculturae Scandinavica, Section A - Animal Science. - : Informa UK Limited. - 0906-4702 .- 1651-1972. ; 59, s. 181-191
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Tidskriftsartikel (refereegranskat)abstract
- The study evaluates the first three parities of 144 Swedish LandracexYorkshire sows from three certified organic and three conventional commercial piglet-producing herds. Sows and litters were weaned at seven and five weeks post partum (pp) in organic and conventional herds, respectively. Herdsmen judged sow behaviour and maternal ability at farrowing, two weeks pp and at weaning. Herdsmen collected registrations of litter size, litter weight and sow fat status at farrowing and at weaning. Piglet mortality and oestrous signs were registered continuously during the nursing period. Sows in organic herds were scored to be more cautious among piglets, and to have better nursing behaviour and maternal ability in early lactation than sows in conventional herds. Piglet mortality was higher in organic than in conventional herds. Oestrus during lactation was only observed among sows in organic herds, and sows showing oestrus during lactation were fatter at weaning.
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| 10. |
- Åkerfeldt, Magdalena, et al.
(författare)
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Ny forskning om djurvälfärd
- 2009
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Ingår i: Svensk gris med knorr. - 1650-5077. ; , s. 14-14
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Tidskriftsartikel (populärvet., debatt m.m.)
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