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| Frevert, H.; Yin, T.; Simianer, H.; König, S.. |
| In the past decade, successful selection on production traits for dairy cattle has greatly increased milk production. Recently, selection indices for female fertility were gradually and increasingly introduced into the overall breeding goals for dairy cattle (Miglior et al., 2005). As a by-product of fermention in ruminants, enteric methane emissions (ME) should also be controlled and mitigated due to their contribution to global warming (Forster et al., 2007) and as a cause for inefficient use of dietary energy. Moderate heritabilities ranging between 0.30 and 0.35 for predicted and real measurements of ME were reported for dairy cows and ewe lambs (de Haas et al., 2011; Pinares-Patiño et al., 2011), indicating that a heritable component for ME is... |
| Tipo: Working paper |
Palavras-chave: Dairy cattle; Breeding and genetics. |
| Ano: 2014 |
URL: http://orgprints.org/26639/1/Frevert-etal-2014-paper-lowinputbreeds-dairy-cattle.pdf |
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| Jaeger, Maria; Brügemann, Kerstin; König, S.. |
| The aims of the present study were i) to analyse the genetic structure of the local black and white cattle breed (DSN), and ii) to analyse genotype by environment interactions based on defined herd parameter groups (geographic, environmental, phenotypic descriptors). The study considered 3688 DSN and 3599 HF cows from 46 herds keeping both breeds. Farms mostly reflected pasture based low input production systems. A multiple trait approach, i.e. defining same traits in different clusters as two different traits, was applied to prove genotype by environment interactions based on genetic correlation estimates. Genetic correlations between low heritability functional traits were lower than for production traits. Especially for functional traits such as somatic... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Beef cattle; Breeding and genetics. |
| Ano: 2017 |
URL: http://orgprints.org/31802/1/Studien%20zu%20Genotyp-Umwelt-Interaktionen%20beim.pdf |
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