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| Registros recuperados: 14 | |
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| Gredler, B.; Sargolzaei, M.; Bapst, B.; Bieber, A.; Simianer, H.; Seefried, F.R.. |
| Imputation of genotypes can be used to reduce the implementation costs of genomic selection. In this study, we evaluated the accuracy of genotype imputation from Illumina 54k to Illumina High Density (HD) in Brown Swiss cattle. Genotype data comprised 6,106 54k and 880 HD genotyped bulls and cows of Brown Swiss and Original Braunvieh cattle. Genotype data was checked for parentage conflicts and SNP were excluded if MAF was below 0.5% and SNP call rate was lower than 90%. The final data set included 39,004 SNP for the 54k and 627,306 SNP for the HD chip. HD genotypes of animals born between 2004 and 2008 (n=365) were masked to mimic animals genotyped with the 54k chip. Methods used for imputation were FImpute and Findhap V2. Both programs use pedigree... |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Breeding and genetics. |
| Ano: 2013 |
URL: http://orgprints.org/36412/1/Gredler-etal-2013_Plant_Animal_Genome_XXI_Congress_SanDiego_USA.pdf |
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| Kramer, M.; Erbe, M.; Seefried, F.R.; Gredler, B.; Bapst, B.; Bieber, A.; Simianer, H.. |
| In this study, direct genomic values for the functional traits general temperament, milking temperament, aggressiveness, rank order in herd, milking speed, udder depth, position of labia, and days to first heat in Brown Swiss dairy cattle were estimated based on ∼777,000 (777k) single nucleotide polymorphism (SNP) information from 1,126 animals. Accuracy of direct genomic values was assessed by a 5-fold cross-validation with 10 replicates. Correlations between deregressed proofs and direct genomic values were 0.63 for general temperament, 0.73 for milking temperament, 0.69 for aggressiveness, 0.65 for rank order in herd, 0.69 for milking speed, 0.71 for udder depth, 0.66 for position of labia, and 0.74 for days to first heat. Using the information of... |
| Tipo: Journal paper |
Palavras-chave: Beef cattle; Breeding and genetics. |
| Ano: 2014 |
URL: http://orgprints.org/25080/1/Kramer_2014_Accuracy%20of%20direct%20genomic%20values.pdf |
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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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| Bapst, B.; Baes, C.; Seefried, F.R.; Bieber, A.; Simianer, H.; Gredler, B.. |
| The effect of including 1,236 cows in the current reference population of Swiss Brown Swiss cattle on the accuracy of genomic breeding values was studied. The accuracy of genomic predictions based on reference populations consisting of bulls only and bulls and cows was compared. The gain in accuracy was very small or not existing at all. Reasons could be that the number of cows was too small for a reference population consisting of 4,085 bulls and that the cows and bulls were too closely related. Nevertheless, genotyping cows and subsequent inclusion in the reference population should be accelerated. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Breeding and genetics. |
| Ano: 2013 |
URL: http://orgprints.org/36411/1/Bapst-etal-2013-Interbull-Bulletin-No47-p187-191.pdf |
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| Kramer, M.; Erbe, M.; Bapst, B.; Bieber, A.; Simianer, H.. |
| The aim of this study was to estimate genetic parameters and accuracies of breeding values for milk content traits of individual udder quarters in Brown Swiss cattle. Data of 1,799 phenotyped cows from 40 Swiss dairy herds were analyzed, taking the complete pedigree into account. Fat, protein, lactose, and urea contents, somatic cell score (SCS), and information about hyperkeratosis were available for each udder quarter. The milk of rear udder quarters was found to have significantly higher lactose content and significantly lower fat content than milk of the front udder quarters. The same trend found for fat content was observed for protein content, whereas no differences between the udder quarters were observed for urea content, SCS, or hyperkeratosis.... |
| Tipo: Journal paper |
Palavras-chave: Dairy cattle; Breeding and genetics. |
| Ano: 2013 |
URL: http://orgprints.org/25079/1/Kramer2013%20invidual%20udder%20quarter.pdf |
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| Kramer, M.; Erbe, M.; Bapst, B.; Bieber, A.; Simianer, H.. |
| The aim of this study was to estimate genetic parameters and accuracies of breeding values for a set of functional, behavior, and conformation traits in Brown Swiss cattle. These traits were milking speed, udder depth, position of labia, rank order in herd, general temperament, aggressiveness, milking temperament, and days to first heat. Data of 1,799 phenotyped Brown Swiss cows from 40 Swiss dairy herds were analyzed taking the complete pedigree into account. Estimated heritabilities were within the ranges reported in literature, with results at the high end of the reported values for some traits (e.g., milking speed: 0.42±0.06, udder depth: 0.42±0.06), whereas other traits were of low heritability and heritability estimates were of low accuracy (e.g.,... |
| Tipo: Journal paper |
Palavras-chave: Dairy cattle; Breeding and genetics. |
| Ano: 2013 |
URL: http://orgprints.org/23587/1/kramer-etal-JDS_2013_96_5954.pdf |
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| Bieber, A.; Kramer, M.; Erbe, M.; Bapst, B.; Isensee, A.; Maurer, V.; Simianer, H.. |
| Parameter estimation on low-input dairy shows that it is worthwile to invest into phenotyping of new traits. EBVs based on phenotypes of cows are informative, this might be benefical for integration of genomic data of phenotyped cows into genomic breeding programs. |
| Tipo: Conference paper, poster, etc. |
Palavras-chave: Dairy cattle; Breeding and genetics. |
| Ano: 2013 |
URL: http://orgprints.org/25081/1/Nantes_2013_Abstracts.pdf |
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| Simianer, H.; Augsten, F.; Bapst, B.; Franke, E.; Maschka, R.; Reinhardt, F.; Schmidtko, J.; Stricker, C.. |
| In dem Projekt wurden für verschiedene Merkmalskomplexe an zwei verschiedenen Datensätzen Genotyp x Umwelt-Interaktionen zwischen ökologischen und konventionellen Produktionssystemen geschätzt. Anhand Schweizer Daten wurden für Braunvieh und Fleckvieh für Milchleistungsmerkmale Korrelationen > 0.9 zwischen beiden Betriebsformen geschätzt, wohingegen die genetische Korrelationen für funktionale Merkmale (Rastzeit, Zellzahl) geringer (0.8 bis 0.9) waren. Diese Korrelationen konnten für die Rasse Holstein Friesian auf Grund einer Auswertung Deutscher Daten bestätigt werden. Generell liegt für Leistungsmerkmale keine und für funktionale Merkmale eine geringe Genotyp x Umwelt-Interaktion zwischen ökologischen und konventionellen Betrieben vor, wobei... |
| Tipo: Project description |
Palavras-chave: Dairy cattle; Breeding and genetics. |
| Ano: 2007 |
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| Simianer, H.; Augsten, F.; Bapst, B.; Franke, E.; Maschka, R.; Reinhardt, F.; Schmidtko, J.; Stricker, C.. |
| In dem Projekt wurden für verschiedene Merkmalskomplexe an zwei verschiedenen Datensätzen Genotyp x Umwelt-Interaktionen zwischen ökologischen und konventionellen Produktionssystemen geschätzt. Anhand Schweizer Daten wurden für Braunvieh und Fleckvieh für Milchleistungsmerkmale Korrelationen > 0.9 zwischen beiden Betriebsformen geschätzt, wohingegen die genetische Korrelationen für funktionale Merkmale (Rastzeit, Zellzahl) geringer (0.8 bis 0.9) waren. Diese Korrelationen konnten für die Rasse Holstein Friesian auf Grund einer Auswertung Deutscher Daten bestätigt werden. Generell liegt für Leistungsmerkmale keine und für funktionale Merkmale eine geringe Genotyp x Umwelt-Interaktion zwischen ökologischen und konventionellen Betrieben vor, wobei... |
| Tipo: Report |
Palavras-chave: Dairy cattle; Breeding and genetics. |
| Ano: 2007 |
URL: http://orgprints.org/11222/1/11222%2D03OE373%2Duni%2Dgoettingen%2Dsimianer%2D2007%2Dmilchviehzucht.pdf |
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| Registros recuperados: 14 | |
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