Large rotary dairies achieve high cow throughput but are not more labour efficient than medium-sized rotaries
J. P. Edwards A B C , J. G. Jago A and N. Lopez-Villalobos BA DairyNZ, Private Bag 3221, Hamilton 3240, New Zealand.
B Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand.
C Corresponding author. Email: Paul.Edwards@dairynz.co.nz
Animal Production Science 53(6) 573-579 https://doi.org/10.1071/AN12312
Submitted: 3 September 2012 Accepted: 18 December 2012 Published: 27 March 2013
Abstract
It was hypothesised that large rotary dairies (>60 clusters) are not more operator efficient than medium-sized rotaries (40–60 clusters). This was tested by collecting and analysing milking data, during peak and late lactation, from block calving herds milked in rotary dairies fitted with electronic milk meters. Data were collected from a total of 61 unique farms around New Zealand, with rotary dairies ranging in size from 28 to 80 clusters, for two 5-day periods during spring (September–November 2010; 47 farms; average milk yield 23.1 kg/day) and autumn (February–April 2011; 60 farms; average milk yield 16.4 kg/day). A telephone survey was conducted to collect basic farm details: size, land area, the number of herds managed (including hospital herds), number of operators in the dairy and total labour input. A site visit was conducted to collect data such as the number of bails/stalls over the entrance and exit of the platform. The herd management software on each farm was programmed to record similar fields for each of the six machine manufacturers represented. Variables recorded included cow, date, identification time, bail number, milk yield, milking duration, and average milk flow rate. Calculations were performed to determine the number of cows milked and milk harvested per hour as well as the operator efficiency values for these measures and an estimate of cluster utilisation. Mixed models were used to determine the relationship between the dependent variables, cows milked per hour, milk harvested per hour, cows milked per operator per hour, milk harvested per operator per hour, and cluster utilisation, and the independent variables collected. Cows milked and milk harvested per hour increased linearly with rotary size, during both spring and autumn and there was a quadratic relationship between operator efficiency measures and rotary size, which peaked at ~60 clusters. Cluster utilisation, the amount of time clusters were harvesting milk out of the plant running time, was estimated at 46 ± 6%. Larger rotary dairies on average achieved greater throughput; however, they were not more operator efficient than medium-sized rotaries. Thus, large rotary dairies are best suited to farms where the additional throughput is required.
References
Armstrong DV, Quick AJ (1986) Time and motion to measure milking parlour performance. Journal of Dairy Science 69, 1169–1177.| Time and motion to measure milking parlour performance.Crossref | GoogleScholarGoogle Scholar |
Armstrong DV, Gamroth MJ, Smith JF (2001) Milking parlour performance. Proceedings of the Western Dairy Management Conference 5, 7–12.
Bruckmaier RM, Hilger M (2001) Milk ejection in dairy cows at different degrees of udder filling. The Journal of Dairy Research 68, 369–376.
| Milk ejection in dairy cows at different degrees of udder filling.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD3MXotl2ntro%3D&md5=f197d5014cbbe5ff8210c5801c6c5b2dCAS |
Copeman PJA (1985) Achieving efficient throughput in rotary dairies. In ‘The challenge: efficient dairy production’. (Ed. TI Phillips) pp. 523–524. (Australian Society of Animal Production: Warragul, Vic.)
Cuthbert S (2008) ‘DairyNZ milking practices and technology use survey.’ (LIC: Hamilton, New Zealand)
DairyNZ, LIC (2011) New Zealand dairy statistics 2010–11. Available at http://www.dairynz.co.nz/file/fileid/39959 [Verified 29 August 2012]
Edwards JP, Lopez-Villalobos N, Jago JG (2012) Increasing platform speed and the percentage of cows completing a second rotation improves throughput in rotary dairies. Animal Production Science 52, 969–973.
| Increasing platform speed and the percentage of cows completing a second rotation improves throughput in rotary dairies.Crossref | GoogleScholarGoogle Scholar |
Fuentes-Pila J, DeLorenzo MA, Beede DK, Staples CR, Holter JB (1996) Evaluation of equations based on animal factors to predict intake of lactating Holstein cows. Journal of Dairy Science 79, 1562–1571.
| Evaluation of equations based on animal factors to predict intake of lactating Holstein cows.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DyaK28Xmt1Kmtr4%3D&md5=35c368ca075abd24ddb9240929785aa8CAS |
García SC, Holmes CW (2001) Lactation curves of autumn- and spring-calved cows in pasture-based dairy systems. Livestock Production Science 68, 189–203.
| Lactation curves of autumn- and spring-calved cows in pasture-based dairy systems.Crossref | GoogleScholarGoogle Scholar |
O’Donnell S, Shalloo L, Butler AM, Horan B (2008) A survey analysis of opportunities and limitations of Irish dairy farmers. Journal of Farm Management 13, 419–434.
Smith JF, Harner J, Brouk ML, Armstrong DV, Gamroth MJ, Meyer MJ (1999) Relocation and expansion planning. Proceedings of the Western Dairy Management Conference 4, 73–85.
Smith JF, Harner J, Armstrong DV, Fuhrmann T, Gamroth MJ, Brouk ML, Reid DA, Bray DR (2003) Selecting and managing your milking facility. Proceedings of the Western Dairy Management Conference 6, 119–133.
Taylor G, van der Sande L, Douglas R (2009) Smarter not harder: improving labour productivity in the primary sector. Available at http://maxa.maf.govt.nz/sff/about-projects/search/05-028/technical-report.pdf [Verified 29 August 2012]
