Lerma Valley is located in Salta province from Argentina, between 1100 and 1450 m above sea level, which absolute maximum temperatures stand out in November, reaching up to 40.9 °C, while July records absolute minimums of − 8.1 °C (Belmonte 2009; Martinez 2015). There are a total of 51 dairy farms with approximately 6500 Holstein cows in milking each (Suarez and Martinez 2015). The number of lactating cows in farm A (FA) and in farm B (FB) was 180 and 370 and an average of 23 and 25 of milk/cow/day, respectively. Both farms used a vaccine to prevent diarrheas with two doses 60 and 30 days prior to delivery as a general protocol.

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