Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

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Implementing genonomic prediction models in generic evaluation of large populations
Napel, J. ten; Schopen, Ghyslaine ; Vandenplas, J. ; Cromie, A.R. ; Grevenhof, E.M. van; Veerkamp, R.F. - \ 2018
Towards routine estimation of breeding values using one million genotyped animals
Napel, J. ten; Cromie, Andrew ; Schopen, Ghyslaine ; Vandenplas, J. ; Veerkamp, R.F. - \ 2018
In: World Congress on Genetics Applied to Livestock Production IAVS / Massey University
The Theory of Genetics Applied to Livestock Production; Some Experiences from Ireland.
Cromie, A.R. ; Amer, P.R. ; Veerkamp, R.F. ; Berry, D.P. ; Wickham, B.W. - \ 2010
Multiple-breed genetic evaluations of cattle in Ireland
Hickey, J.M. - \ 2008
University of Dublin. Promotor(en): S. Ward, co-promotor(en): Roel Veerkamp; E. O'Riordan; A.R. Cromie. - - 168 p.
Developments in national and international beef evaluations; some experiences from Ireland
Evans, R.D. ; Pabiou, T. ; Cromie, A.R. ; Kearney, F. ; Veerkamp, R.F. ; Amer, P.R. - \ 2008
In: Proceedings of the Interbull meeting, 16-19 June 2008, Niagra Falls USA. - - p. 18 - 24.
The efficacy of an ivermectin/closantel injection against experimentally induced infections and field infections with gastrointestinal nematodes and liver fluke in cattle
Borgsteede, F.H.M. ; Taylor, S. ; Gaasenbeek, C.P.H. ; Couper, A. ; Cromie, L. - \ 2008
Veterinary Parasitology 155 (2008)3-4. - ISSN 0304-4017 - p. 235 - 241.
resistant fasciola-hepatica - triclabendazole - calves - sheep - b1a - avermectins - closantel
Three studies were performed to test the efficacy of an ivermectin/closantel injection (200 ¿g/kg¿1 ivermectin and 5 mg/kg¿1 closantel) in cattle. Two were experimentally induced infections of Ostertagia ostertagi, Cooperia oncophora and Fasciola hepatica in calves, and the third had natural field infections in cattle with several species of gastrointestinal nematodes and F. hepatica. In the two studies with artificial infections, four groups of 8 calves were used. All calves were infected with metacercariae on Day 0. Infection with the nematodes took place on Day 33 in groups 1 and 2 and on Day 54 in groups 3 and 4. Treatment was given to calves of group 1 on Day 63 and to calves of group 3 on Day 84. Calves of groups 2 and 4 served as untreated control groups. Calves of groups 1 and 2 were sacrificed on Day 84, calves of groups 3 and 4 on Day 105. The field study was carried out on a commercial farm in the Netherlands. Six groups of cattle were used. Groups A and B consisted of 10 parasite free calves, introduced to the farm and grazed for four weeks on pastures naturally infected with gastrointestinal nematode larvae and liver fluke metacercariae. Group C were the farmers own calves (15), group D heifers (10), group E dry cows (6) and group F milking cows (20). Treatment was given to animals of group A, C, D and E 10 weeks after housing of group A and B. Animals of groups B and F served as untreated controls. Calves of groups A and B were sacrificed 14 days after treatment. The efficacy of the treatment was calculated on basis of the post-mortem fluke and nematode worm counts in the first two studies and on a combination of post-mortem fluke and nematode worm counts and faecal egg output in the field study. In the two experimental studies, the efficacy of the treatment against F. hepatica was 99.2% and 94.5% for 9-week-old flukes and 98.4% and 99.5% for 12-week-old flukes. For O. ostertagi in both studies efficacy was 100% and against C. oncophora in both Groups 1 efficacy was 84.9% and 99.0% and in Groups 3 85.0% and 99.4%. In the field study, based on the post mortem fluke and nematode worm counts in groups A and B, efficacy against F. hepatica was 98.4%, O. ostertagi 100%, C. oncophora 99.4%, C. punctata 100%, Nematodirus helvetianus 60.8%, Trichuris spp. 100% and against larval intestinal nematodes 100%. The results of the faecal examinations 14 days after treatment confirmed the post-mortem results with 100% reduction of egg output for O. ostertagi, C. punctata, Trichostrongylus spp. and Trichuris spp. and low egg output of C. oncophora and N. helvetianus.
Estimation of accuracy and bias in genetic evaluations with genetic groups using sampling
Hickey, J.M. ; Keane, M.G. ; Kenny, D.A. ; Cromie, A.R. ; Mulder, H.A. ; Veerkamp, R.F. - \ 2008
Journal of Animal Science 86 (2008)5. - ISSN 0021-8812 - p. 1047 - 1056.
breeding values - animal-model - mixed models - beef-cattle
Accuracy and bias of estimated breeding values are important measures of the quality of genetic evaluations. A sampling method that accounts for the uncertainty in the estimation of genetic group effects was used to calculate accuracy and bias of estimated effects. The method works by repeatedly simulating phenotypes for multiple traits for a defined data and pedigree structure. These simulated values are analysed using BLUP with genetic groups in the relationship matrix. Accuracies and biases are then calculated as correlations among and differences between true and estimated values across all replicates, respectively. The method was applied to the Irish beef production data set for 15 traits and with 15 genetic groups to account for differences in breed means. Accuracy and bias of estimated genetic groups effects, estimated comparisons between genetic groups effects, estimated breeding values within genetic group, and estimated breeding values across genetic group were calculated. Small biases were detected for most estimated genetic group effects and most estimated comparisons between genetic group effects. Most of these were not of importance relative to the phenotypic standard deviation of the traits involved. For example, a bias of 0.78% of the phenotypic standard deviation was detected for carcass conformation in Aberdeen Angus. However, one trait, calf quality, which has very few performance records in the data set, displayed larger bias ranging from -10.31% to 5.85% of the phenotypic standard deviation across the different estimated genetic group effects. Large differences were observed in the accuracies of genetic group effects, ranging from 0.02 for feed intake in Holstein, which had no data recorded, to >0.97 for carcass conformation, a trait with large amounts of data recorded in the different genetic groups. Large differences were also observed in the accuracies of the comparisons among genetic group effects. The accuracies of the estimated breeding values within genetic group and estimated breeding values across genetic group were sometimes different; for example, carcass conformation in Belgian Blue had an average accuracy within genetic group of 0.69 compared to an average accuracy across genetic group of 0.89. This suggests that the accuracy of genetic groups should be taken into account when publishing estimated breeding values across genetic groups.
Heterogeneity of genetic parameters for calving difficulty in Holstein heifers in Ireland
Hickey, J.M. ; Keane, M.G. ; Kenny, D.A. ; Cromie, A.R. ; Amer, P.R. ; Veerkamp, R.F. - \ 2007
In: Proceedings of the Irish Agricultural Research Forum, Tullamore, Ireland, 12 - 13 March, 2007. - - p. 79 - 79.
Heterogeneity of genetic parameters for calving difficulty in Holstein heifers in Ireland
Hickey, J.M. ; Keane, M.G. ; Kenny, D.A. ; Cromie, A.R. ; Veerkamp, R.F. - \ 2007
In: Book of abstracts, EAAP, 58st Annual Meeting - Feed for Pig Health Workshop, 26 - 29 August, 2007, Dublin, Ireland. - Wageningen : Wageningen Academic Publishers - ISBN 9789086860456 - p. 55 - 55.
Heterogeneity of genetic parameters for calving difficulty in Holstein heifers in Ireland
Hickey, J.M. ; Keane, M.G. ; Kenny, D.A. ; Cromie, A.R. ; Amer, P.R. ; Veerkamp, R.F. - \ 2007
Journal of Dairy Science 90 (2007). - ISSN 0022-0302 - p. 3900 - 3908.
random regression-model - dairy-cattle - covariance functions - breeding strategies - sire evaluation - calf mortality - beef-cattle - dystocia - weight - ease
Calving difficulty is a trait that greatly affects animal welfare, herd profitability, and the amount of labor required by cattle farmers. It is influenced by direct and maternal genetic components. Selection and breeding strategies can optimize the accuracy of genetic evaluations and correctly emphasize calving difficulty in multiple-trait indices provided there are accurate estimates of genetic parameters. In Ireland, large differences exist in the age at which heifers first give birth to calves. The objective of this study was to estimate genetic parameters for calving difficulty in first-parity Holsteins and to determine whether these differed with age of the heifer at calving. Transformed calving difficulty records for 18,798 Holstein heifers, which calved between January 2002 and May 2006, were analyzed using univariate, multitrait, and random regression linear sire-maternal grandsire models. The model that 1) fitted a second-order random regression of dam age at first parity for the direct component, 2) treated the maternal component as a single trait regardless of dam age, and 3) fitted a single residual variance component was optimal. Heritabilities for direct (0.13) and maternal (0.04) calving difficulty were significantly different from zero. These 2 components were moderately negatively correlated (¿0.47). Estimates of direct genetic variance and heritability were heterogeneous along the dam age trajectory, decreasing initially with dam age before subsequently increasing. Heritability estimates ranged between 0.11 and 0.37 and were higher for records with younger and older dams at parturition. Genetic correlations between the direct components of calving difficulty decreased from unity to 0.5 with increasing distance between dam ages at parturition. The results of this study indicated that heterogeneity of direct genetic variance existed for calving difficulty, depending on dam age at first parturition.
Genetic parameters for EUROP carcass traits within different groups of cattle in Ireland
Hickey, J.M. ; Keane, M.G. ; Kenny, D.A. ; Cromie, A.R. ; Veerkamp, R.F. - \ 2007
Journal of Animal Science 85 (2007)2. - ISSN 0021-8812 - p. 314 - 321.
dairy-cattle - finnish ayrshire - milk-production - quality traits - beef traits - model - records - growth - bulls
The first objective of this study was to test the ability of systems of weighing and classifying bovine carcasses used in commercial abattoirs in Ireland to provide information that can be used for the purposes of genetic evaluation of carcass weight, carcass fatness class, and carcass conformation class. Secondly, the study aimed to test whether genetic and phenotypic variances differed by breed of sire. Variance components for carcass traits were estimated for crosses between dairy cows and 8 breeds of sire commonly found in the Irish cattle population. These 8 breeds were Aberdeen Angus, Belgian Blue, Charolais, Friesian, Hereford, Holstein, Limousin, and Simmental. A multivariate animal model was used to estimate genetic parameters within the Holstein sire breed group. Univariate analyses were used to estimate variance components for the remaining 7 sire breed groups. Multivariate sire models were used to formally test differences in genetic variances in sire breed groups. Field data on 64,443 animals, which were slaughtered in commercial abattoirs between the ages of 300 and 875 d, were analyzed in 8 analyses. Carcass fat class and carcass conformation class were measured using the European Union beef carcass classification system (EUROP) scale. For all 3 traits, the sire breed group with the greatest genetic variance had a value of more than 8 times the sire breed group with least genetic variance. Heritabilities ranged from zero to moderate for carcass fatness class (0.00 to 0.40), from low to moderate for carcass conformation class (0.04 to 0.36), and from low to high for carcass weight (0.06 to 0.65). Carcass weight was the most heritable (0.26) of the 3 traits. Carcass conformation class and carcass fatness class were equally heritable (0.17). Genetic and phenotypic correlations were all positive in the Holstein sire breed group. The genetic correlations varied from 0.11 for the relationship between carcass weight and carcass fatness class to 0.44 for the relationship between carcass conformation class and carcass fatness class. Carcass weight and classification data collected in Irish abattoirs are useful for the purposes of genetic evaluation for beef traits of Irish cattle. There were significantly different variance components across the sire breed groups.
A field efficacy study to determine the efficacy of ivermectin/closantel injection (Norbrook Laboratories Limited, Produce code P-CIV-170) against naturally acquired infections of Fasciola hepatica and gastrointestinal nematode in cattle.
Cromie, L. ; Couper, A. ; Borgsteede, F.H.M. ; Taylor, S. - \ 2007
In: Proceedings of the21st WAAVP Conference, 19 - 23 August, Gent, Belgium. - - p. 303 - 303.
Genetic parameters for carcass traits within crossbred groups of cattle in Ireland
Hickey, J.M. ; Keane, M.G. ; Brophy, P.M. ; Cromie, A.R. ; Veerkamp, R.F. - \ 2006
In: Agricultural Research Forum Tullamore Ireland 15-16 maart 2006. - Tullamore : - p. 82 - 82.
Accounting for heterogeneous variance components in multiple breed evaluations of beef traits in black and white cattle
Hickey, J.M. ; Calus, M.P.L. ; Cromie, A.R. ; Keane, M.G. ; Brophy, P.M. ; Veerkamp, R.F. - \ 2006
To one cow survival and fertility evaluation for Irish dairy and beef cattle
Pool, M.H. ; Olori, V.E. ; Cromie, A.R. ; Wickman, B.W. ; Veerkamp, R.F. - \ 2005
In: Proceedings of the 2005 Interbull meeting, Uppsala, Sweden, June 2-4 2005, Uppsala : - p. 55 - 58.
Utilizing multibreed commercial slaughter information in beef selection indices in Ireland
Hickey, J.M. ; Amer, P.R. ; Cromie, A.R. ; Grogan, A. ; Calus, M.P.L. ; Wickman, B.W. ; Veerkamp, R.F. - \ 2005
In: Proceedings of the 2005 Interbull meeting, Uppsala, Sweden, June 4-6, 2005 Uppsala : - p. 109 - 112.
Multiple breed evaluation for cow survival and fertility in Irish beef cattle
Pool, M.H. ; Olori, V.E. ; Cromie, A.R. ; Veerkamp, R.F. - \ 2005
- 496 p.
Accuracy of predicting milk yield from alternative recording schemes
Berry, D.P. ; Olori, V.E. ; Cromie, A.R. ; Rath, M. ; Veerkamp, R.F. ; Dilon, P. - \ 2005
Animal Science 80 (2005)1. - ISSN 1357-7298 - p. 53 - 60.
estimating lactation yields - dairy-cattle - interval
The effect of reducing the frequency of official milk recording and the number of recorded samples per test-day on the accuracy of predicting daily yield and cumulative 305-day yield was investigated. A control data set consisting of 58 210 primiparous cows with milk test-day records every 4 weeks was used to investigate the influence of reduced milk recording frequencies. The accuracy of prediction of daily yield with one milk sample per test-day was investigated using 41 874 test-day records from 683 cows. Results show that five or more test-day records taken at 8-weekly intervals (A8) predicted 305-day yield with a high level of accuracy. Correlations between 305-day yield predicted from 4-weekly recording intervals (A4) and from 8-weekly intervals were 0·99, 0·98 and 0·98 for milk, fat and protein, respectively. The mean error in estimating 305-day yield from the A8 scheme was 6·8 kg (s.d. 191 kg) for milk yield, 0·3 kg (s.d. 10 kg) for fat yield, and -0·3 kg (s.d. 7 kg) for protein yield, compared with the A4 scheme. Milk yield and composition taken during either morning (AM) or evening (PM) milking predicted 24-h yield with a high degree of accuracy. Alternating between AM and PM sampling every 4 weeks predicted 305-day yield with a higher degree of accuracy than either all AM or all PM sampling. Alternate AM-PM recording every 4 weeks and AM + PM recording every 8 weeks produced very similar accuracies in predicting 305-day yield compared with the official AM + PM recording every 4 weeks
Breeding for survival and calving interval in Ireland
Pool, M.H. ; Meuwissen, T.H.E. ; Olori, V.E. ; Cromie, A.E. ; Calus, M.P.L. ; Veerkamp, R.F. - \ 2002
In: "Proceedings of the 7th World Congress on Genetics Applied to Livestock Production," p.4 pp
Dairy cattle breeding objectives combining yield, survival and calving interval for pasture based systems in Ireland under different quota scenarios
Veerkamp, R.F. ; Dillon, P. ; Kelly, E. ; Cromie, A.R. ; Groen, A.F. - \ 2002
Livestock Production Science 76 (2002). - ISSN 0301-6226 - p. 137 - 151.
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