Modeling heat stress under organic dairy farming conditions in warm temperate climates within the Mediterranean basin

Sammanfattning

We studied the effect of heat stress on milk quality in Spanish organic dairy farms using published milk productivity equations. We collected data from 23 weather stations and 14,424 milk test-days for milk yield and milk fat and protein content for the period July 2011 to June 2013. As an indicator of heat stress, we used the maximum daily temperature-humidity index (THI) from 2 days before the milk test date. We fitted the data using hierarchical regression models stratified by farm, cow parity and monthly test-day milk records. The effect of THI was deemed low on biological costs through milk yield. However, the known negative relationship between milk yield and milk quality (protein and fat content) became even steeper when the THI increased, suggesting a significant negative correlation between heat stress and milk quality. Therefore, although the milk yield of cows in the organic farming systems analyzed appeared resilient to heat stress conditions, milk quality, a major selling point for organic dairy products, was negatively affected. The model presented here could be used to predict the potential impacts of different climate change scenarios on dairy farming, and to delineate adaptation strategies within organic systems.

Nyckelord

Organic farming; Dairy cow; Heat stress; THI; Milk yield; Milk quality; Farm resilience

Publicerad i

Climatic Change
2020, volym: 162, nummer: 3, sidor: 1269-1285

SLU författare

• Blanco Penedo, Isabel

  • Institutionen för kliniska vetenskaper, Sveriges lantbruksuniversitet
    
  • Institut de Recerca i Tecnologia Agroalimentàries (IRTA)

• Ruete, Alejandro

  • Greensway AB

UKÄ forskningsämne

Husdjursvetenskap

Publikationens identifierare

• DOI: https://doi.org/10.1007/s10584-020-02818-y

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/107806