International Journal of Biometeorology

, Volume 62, Issue 9, pp 1663–1674 | Cite as

Relationship between climatic variables and the variation in bulk tank milk composition using canonical correlation analysis

  • Morgana Stürmer
  • Marcos Busanello
  • João Pedro Velho
  • Vanessa Isabel Heck
  • Ione Maria Pereira Haygert-Velho
Original Paper


A number of studies have addressed the relations between climatic variables and milk composition, but these works used univariate statistical approaches. In our study, we used a multivariate approach (canonical correlation) to study the impact of climatic variables on milk composition, price, and monthly milk production at a dairy farm using bulk tank milk data. Data on milk composition, price, and monthly milk production were obtained from a dairy company that purchased the milk from the farm, while climatic variable data were obtained from the National Institute of Meteorology (INMET). The data are from January 2014 to December 2016. Univariate correlation analysis and canonical correlation analysis were performed. Few correlations between the climatic variables and milk composition were found using a univariate approach. However, using canonical correlation analysis, we found a strong and significant correlation (rc = 0.95, p value = 0.0029). Lactose, ambient temperature measures (mean, minimum, and maximum), and temperature-humidity index (THI) were found to be the most important variables for the canonical correlation. Our study indicated that 10.2% of the variation in milk composition, pricing, and monthly milk production can be explained by climatic variables. Ambient temperature variables, together with THI, seem to have the most influence on variation in milk composition.


Milk quality Bovine milk Protein Fat Somatic cell count Total bacterial count 


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Copyright information

© ISB 2018

Authors and Affiliations

  1. 1.Graduate in Animal Science, Campus de Palmeira das MissõesFederal University of Santa MariaPalmeira das MissõesBrazil
  2. 2.Department of Animal Science, College of Agriculture“Luiz de Queiroz”/University of São Paulo - ESALQ/USPSão PauloBrazil
  3. 3.Department of Animal Science and Biological Sciences, Campus de Palmeira das MissõesFederal University of Santa MariaPalmeira das MissõesBrazil

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