Dr Simon Archer
Simon has worked in veterinary practice, academia, and as a government vet. His research to date has focussed on the epidemiology of lameness, mastitis, fertility, and infectious disease in dairy cattle. He is interested in developing cost effective control plans for endemic and exotic diseases of farmed animals. His most recent post was at the Veterinary Medicines Directorate, assessing the safety and efficacy of veterinary medicines for terrestrial and aquatic animals. Simon joined University of Surrey in 2019 as Lecturer in Veterinary Clinical Research.
Simon is developing a research strategy for the Department of Veterinary Clinical Sciences.
Module Lead: Veterinary Research and Evidence Based Veterinary Medicine (VMS3008)
This study estimates the birth weight and growth rate for UK dairy calves and partitions unexplained variability in the weight of calves aged up to 20 wk. Raising replacements is a major contributor to the sustainability of dairying, but existing industry targets may not be applicable and achievable on all farms. For hierarchical data, variance partition coefficients (VPC) describe the proportion of unexplained variance residing at each level of the hierarchy due to clustering and indicate the potential to change outcomes through influencing variables acting at each level. This information could be used to inform the allocation of resources for further investigation. Calves were weighed according to farm-specific protocols. The data set analyzed contained records between June 5, 2014, and February 28, 2020, from 28 veterinary practices servicing 139 farms with 19,708 calves up to 20 wk of age, from which there were 59,588 weight recordings. Calves were Holstein-Friesian females. Calf weight was described using a multivariable mixed linear model with fixed effects for age. Mean birth weight was 41 kg. Mean growth rate increased from 0.59 kg/d at 1 d of age to 0.87 kg/d after 138 d. Cumulative mean growth rate up to 138 d of age was 0.73 kg/d. Birth weight and growth rate estimates are comparable with those made previously but are more precise due to larger sample size. Calf growth rate varied between farms, meaning that VPC at the calf, farm, and veterinary practice levels depended on calf age. Most unexplained variation in the weight of calves aged 66 d and over was due to differences between farms. At birth and 130 d of age, VPC at the farm level was 0.02 and 0.77, respectively. In contrast, most variation in neonatal calf weight was due to differences between calves. At birth and 130 d of age, VPC at the calf level was 0.84 and 0.20, respectively. The 0.025 to 0.975 quantile coverage of cluster-specific mean calf birth weight for combinations of veterinary practice and farm was 34 to 49 kg. The 0.025 to 0.975 quantile coverage of cluster-specific cumulative mean calf growth rate for combinations of veterinary practice and farm was 0.56 to 1.00 kg/d. Understanding reasons for these differences should be the basis of research into optimal calf management strategies to define economic targets for specific circumstances.
- Randall, L. V., M. J. Green, M. G. G. Chagunda, C. Mason, S. C. Archer, and J. N. Huxley. 2018. The contribution of previous lameness events and body condition score to the occurrence of lameness in dairy herds: A study of 2 herds. J. Dairy Sci. 101:1311-1324.
- Archer, S. C., Bradley, A. J., Cooper, S. Davies, P. L, and M. J. Green. 2017. Prediction of Streptococcus uberis clinical mastitis risk using Matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF MS) in dairy herds. Prev. Vet. Med. 144:1-6.
- Davies, P. L., J. A. Leigh, A. J. Bradley, S. C. Archer, R. D. Emes, and M. J. Green. 2016. Molecular epidemiology of Streptococcus uberis clinical mastitis in dairy herds: Strain heterogeneity and transmission. J. Clin. Microbiol. 54:68-74.
- Statham, J. M. E., L. V. Randall, and S. C. Archer. 2015. Reduction in daily milk yield associated with sub-clinical Bovine Herpes Virus 1 infection. Vet. Rec. 177: doi:10.1136/vr.
- Leach, K. A., S. C. Archer, J. E. Breen, M. J. Green, I. C. Ohnstad, S. Tuer, and A. J. Bradley. 2015. Recycling manure as cow bedding: Potential risks and benefits for UK dairy farms. Vet. J. doi: 10.1016/j.tvjl.2015.08.013.
- Archer, S. C., R. Newsome, H. Dibble, C. J. Sturrock, M. G. G. Chagunda, C. S. Mason, and J. N. Huxley. 2015. Claw length recommendations for dairy cow foot trimming. Vet. Rec. doi: 10.1136/vr.103197.
- Archer, S. C., C. D. Hudson, and M. J. Green. 2015. Use of stochastic simulation to evaluate the reduction in methane emissions and improvement in reproductive efficiency from routine hormonal interventions in dairy herds. PLOS ONE 10: e0127846. doi:10.1371/journal.pone.0127846.
- Randall, L. V., M. J. Green, M. G. G. Chagunda, C. Mason, S. C. Archer, L. E. Green, and J. N. Huxley. 2015. Low body condition predisposes cattle to lameness: an 8 year study of one dairy herd. J. Dairy Sci. 98: 3766-3777.
- Thomas, H. J., G. G. Miguel-Pacheco, N. J. Bollard, S. C. Archer, N. J. Bell, C. Mason, O. J. R. Maxwell, J. G. Remnant, P. Sleeman, H. R. Whay, and J. N. Huxley. 2015. Evaluation of treatments for claw horn lesions in dairy cows in a randomized controlled trial. J. Dairy Sci. 98: 1-10.
- Archer, S. C., F. Mc Coy, W. Wapenaar, and M.J. Green. 2014. Association between somatic cell count during the first lactation and the cumulative milk yield of cows in Irish dairy herds. J. Dairy Sci. 97: 2135-2144.
- Archer, S. C., F. Mc Coy, W. Wapenaar, and M. J. Green. 2014. Bayesian evaluation of budgets for endemic disease control; an example using management changes to reduce milk somatic cell count early in the first lactation of Irish dairy cows. Prev. Vet. Med. 113: 80-87.
- Archer, S. C., F. Mc Coy, W. Wapenaar, and M. J. Green. 2013. Association between somatic cell count after first parturition and cumulative milk yield in dairy cows. Vet. Rec. doi: 10.1136/vr.101558.
- Archer, S. C., F. Mc Coy, W. Wapenaar, and M. J. Green. 2013. Association between somatic cell count early in the first lactation and the lifetime milk yield of cows in Irish dairy herds. J. Dairy Sci. 96:2951-2959.
- Archer, S. C., F. Mc Coy, W. Wapenaar, and M. J. Green. 2013. Association between somatic cell count early in the first lactation and the longevity of Irish dairy cows. J. Dairy Sci. 96:2939-2950.
- Archer, S. C., F. Mc Coy, W. Wapenaar, and M. J. Green. 2013. Association of season and herd size with somatic cell count for cows in Irish, English, and Welsh dairy herds. Vet. J. 196: 515-521.
- Archer, S.C., M.J. Green, A. Madouasse, and J.N. Huxley, 2011. Association between somatic cell count and serial locomotion score assessments in UK Dairy Cows. J. Dairy Sci. 94: 4383-4388.
- Archer, S.C., N.J. Bell, and J.N. Huxley. 2010. Lameness in UK dairy cows: A review of the current status. In Pract. 32: 492-504.
- Archer, S.C., M.J. Green and J.N. Huxley, 2010. Association between milk yield and serial locomotion score assessments in UK Dairy Cows. J. Dairy Sci. 93: 4045-4053.
- Wendela Wapenaar, Simon Archer, John Remnant, and Alan Murphy, 2016, Control of Infectious Disease. In Achieving Sustainable Production of Milk, Volume 3, ed John Webster, University of Bristol, UK.
- Jon Huxley, Simon Archer, Nick Bell, Mark Burnell, Laura Green, Sarah Potterton and Jon Reader, 2012. Control of Lameness. In Dairy Herd Health, CABI, ed Martin Green.
- Laura Green, Simon Archer, Andrew Biggs, Andrew Bradley, James Breen, Peter Down, Mike Kerby, Martin Green, Gerdien van Schaik, Wendela Wapenaar. 2012. Control of Infectious Disease. In Dairy Herd Health.