| 1. |
- Carlström, Caroline, et al.
(författare)
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Genetic Associations of In-line Recorded Milkability Traits and Udder Conformation with Udder Health
- 2016
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Ingår i: Acta Agriculturae Scandinavica, Section A - Animal Science. - : Informa UK Limited. - 0906-4702 .- 1651-1972. ; 66, s. 84-91
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Tidskriftsartikel (refereegranskat)abstract
- Milkability and udder conformation traits of Swedish Holstein (SH) and Swedish Red (SR) cows from 93 herds with automatic milking systems or conventional milking parlors were used to study genetic relationships to lactation average somatic cell score (LSCS) and incidence of clinical mastitis (CM). Estimated genetic correlations between measures of milking speed (average flow rate, milking time and box time) and LSCS ranged between 0.29 and 0.57 and showed that high milking speed is associated with increasing LSCS. Regressions indicated a curvilinear relationship. Genetic correlations between milking speed and CM showed similar values as for LSCS in SH cows, but were inconsistent in SR cows. Shallow udder and strong fore udder attachment were consistently correlated with good udder health. The unfavorable relationships between milking speed and udder health traits should be considered together with a few udder conformation traits when selecting for better milkability.
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| 2. |
- Carlström, Caroline, et al.
(författare)
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Genetic associations of teat cup attachment failures, incomplete milkings, and handling time in automatic milking systems with milkability, temperament, and udder conformation
- 2016
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Ingår i: Acta Agriculturae Scandinavica, Section A - Animal Science. - : Informa UK Limited. - 0906-4702 .- 1651-1972. ; 66, s. 75-83
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Tidskriftsartikel (refereegranskat)abstract
- Automatic milking systems (AMS) allow recording of alternative milkability measures. Our objectives were to estimate genetic parameters for teat cup attachment failures (AtF), incomplete milkings (IM), and handling time (HT), and their genetic correlations with box time (BT), udder traits and temperament. Teat coordinates were to measure udder conformation and teat placement. Genetic correlations were estimated between these traits and linear classification traits. Data on Swedish Holstein and Swedish Red cows in 19 AMS herds and 74 herds with conventional milking parlors were analyzed. HT and IM had low heritabilities, but that of AtF was 0.21-0.31. Genetic correlations between AtF and temperament were 0.44-0.71 (calm cows having low AtF). Short BT was weakly genetically associated with shallow udders with short and thin teats. High genetic correlations (0.91-0.98) were found between teat coordinate traits and linear classification traits. Thus, AMS records can be effectively used to select for improved milkability and temperament.
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| 3. |
- Philipsson, Jan
(författare)
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Community-based livestock breeding programmes: essentials and examples
- 2015
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Ingår i: Journal of Animal Breeding and Genetics. - : Wiley. - 0931-2668 .- 1439-0388. ; 132, s. 155–168-
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Tidskriftsartikel (refereegranskat)abstract
- Breeding programmes described as community-based (CBBP) typically relate to low-input systems with farmers having a common interest to improve and share their genetic resources. CBBPs are more frequent with keepers of small ruminants, in particular smallholders of local breeds, than with cattle, pigs or chickens with which farmers may have easier access to alternative programmes. Constraints that limit the adoption of conventional breeding technologies in low-input systems cover a range of organizational and technical aspects. The analysis of 8 CBBPs located in countries of Latin-America, Africa and Asia highlights the importance of bottom-up approaches and involvement of local institutions in the planning and implementation stages. The analysis also reveals a high dependence of these programmes on organizational, technical and financial support. Completely self-sustained CBBPs seem to be difficult to realize. There is a need to implement and document formal socio-economic evaluations of CBBPs to provide governments and other development agencies with the information necessary for creating sustainable CBBPs at larger scales.
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| 4. |
- Philipsson, Jan
(författare)
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Hästen i ridkonsten genom tiderna
- 2016
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Ingår i: Ridkonsten genom tiderna: utmaningar i framtiden. - 9789198318807 ; , s. 35-42
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 5. |
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| 6. |
- Sjöberg, Rickard L., et al.
(författare)
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Laterality and deep brain stimulation of the subthalamic nucleus : applying a dichotic listening task to patients treated for Parkinson's disease
- 2015
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Ingår i: Neurocase. - : Informa UK Limited. - 1355-4794 .- 1465-3656. ; 21:5, s. 601-606
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Tidskriftsartikel (refereegranskat)abstract
- Ear advantage during a dichotic listening task tends to mirror speech lateralization. Previous studies in stroke patients have shown that lesions in the dominant hemisphere often seem to produce changes in ear advantage. In this study six Parkinson's disease (PD) patients treated for motor symptoms with deep brain stimulation (DBS) of the left subthalamic nucleus (STN) were tested preoperatively and at approximately 6 and 18months postoperatively with a dichotic listening task. Results show a significant decline of the right ear advantage over time. In three of the patients a right ear advantage preoperativley changed to a left ear advantage 18months postoperatively. This suggests the possibility that additional longitudinal studies of this phenomenon could serve as a model for understanding changes in indirect measures of speech lateralization in stroke patients.
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| 7. |
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| 8. |
- Viklund, Åsa, et al.
(författare)
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Genetic composition of Nordic riding horse populations and joint breeding value of stallions
- 2016
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Ingår i: Book of Abstracts, EAAP. - 1382-6077. ; 22, s. 575-575
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Riding horse studbooks has increased the use of foreign stallions steadily during the last decades thus challenging the traditional prediction of breeding values (EBV) based on national data as stallions might have too few offspring for the EBV to be published based on national data only. Genetic composition and genetic similarity of the 4 Nordic sport horse studbooks, Danish (DWB), Finnish (FWB), Norwegian (NWB) and Swedish Warmblood (SWB), were estimated using data from young horse test (YHT), 41 216 records, competition (COMP), 73 962 records, and 229 163 horses in pedigree file. The largest genetic contributors originated from Germany with an average genetic contribution of 50% of the genetic composition of the Nordic studbooks, while horses of Thoroughbred origin contributed between 7.3% (FWB) and 31.7% (DWB). Genetic similarity between populations was from 13% (FWB and NWB) to 57% (DWB and SWB). On average, the Holstein contributed most to the similarity with a contribution ranging from 15.5% (FWB and NWB) to 28.1% (DWB and NWB). SWB had the single largest contribution between SWB and FWB (51.7%), and SWB and NWB (43%), while DWB-stallions contributed between 12.4 to 18.5% to the similarity between DWB and the other studbooks. Correlation between YHT traits ranged from 0.68 (walk) to 0.93 (canter). For a stallion to have official EBVs in DWB or SWB, at least 15 offspring must have test records within the population. There were 631 stallions having offspring with YHT records in at least two ≥15 offspring in total). Including test records of offspring from the other populations increased the number of stallions with publishable EBVs from 167 to 255 (DWB), 1 to 94 (FWB), 3 to 113 (NWB) and 175 to 305 (SWB). Accuracy of EBVs for stallions increased from an average of 0.36 to 0.54 over all studbooks. Joint EBV is beneficial and recommended for the Nordic sport horse populations.
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| 9. |
- Viklund, Åsa, et al.
(författare)
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Genetic conditions of joint Nordic genetic evaluations of lifetime competition performance in warmblood sport horses
- 2015
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Ingår i: Journal of Animal Breeding and Genetics. - : Wiley. - 0931-2668 .- 1439-0388. ; 132, s. 308-317
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Tidskriftsartikel (refereegranskat)abstract
- Breeding programmes for warmblood sport horses are similar in the Nordic countries Sweden, Denmark, Finland and Norway, and stallions of same origin are used. The aim was to investigate whether a joint Nordic genetic evaluation based on lifetime competition performance is feasible and beneficial for breeding competitive sport horses in the Nordic countries. Results for almost 45 000 horses in show jumping and 30 000 horses in dressage were available. The larger populations in Sweden and Denmark contributed with 85% of the results. Heritabilities and genetic correlations between performances in the different countries were estimated, and comparisons of accuracies of estimated breeding values (EBVs) and number of stallions with EBVs based on national or joint data were studied. The heritabilities ranged between 0.25 and 0.42 for show jumping and between 0.14 and 0.55 for dressage. The genetic correlations between competition performances in the Nordic countries were estimated to 0.63- 1.00. EBVs based on joint data increased accuracies for EBVs for stallions by 38-81% and increased the number of available stallions with EBVs by 40-288%, compared to EBVs based on national data only. A joint Nordic genetic evaluation for sport horses is recommended.
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| 10. |
- Zonabend König, Emelie, et al.
(författare)
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Live weight, conformation, carcass traits and economic values of ram lambs of Red Maasai and Dorper sheep and their crosses
- 2017
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Ingår i: Tropical Animal Health and Production. - : Springer Science and Business Media LLC. - 0049-4747 .- 1573-7438. ; 49, s. 121–129-
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Tidskriftsartikel (refereegranskat)abstract
- Meat production is the most important trait in the breeding objectives of sheep production in East Africa. The aim of this study was to investigate breed differences in live weight, conformation, carcass traits and economic values for meat production among Red Maasai and Dorper sheep and their crosses. In total, 88 ram lambs, which were reared at the ILRI experimental station, Kapiti plains Estate in Central Kenya, were used for the study. The lambs were slaughtered at Kenya Meat Commission (KMC) at about 1 year of age. Prior to slaughter, the lambs were weighed, measured and assessed by experienced evaluators, and at the abattoir carcass traits were recorded. Large breed differences were found for most traits. Dorper lambs were heavier at delivery for slaughter and had better carcass grade but lower dressing percentage and fat levels than Red Maasai. Crossbreds were generally better than the parental breeds. Evaluators were willing to pay more for the Dorper lambs for slaughter although carcass weights later were shown not to be higher than for Red Maasai. Evaluators undervalued Red Maasai lambs by 8-13 % compared to Dorper lambs according to the prices quoted per kilogramme live or carcass weight by KMC. Live weight was better than any other live measure in predicting carcass weight. Due to the overall higher ranking of the crossbred lambs for meat production, Dorper may be useful as a terminal sire breed for crossing with Red Maasai ewes.
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