heat stress dairy, trouw nutrition, animal nutrition

1

Increased Respiration Rate

Brouk et al 2002 demonstrated a strong correlation in respiratory rate to internal body temperature

2

Reduced feed intake by up to 30%

(Wheelock et al, 2010)

3

Decreased milk yield and milk fat

4

Increased standing time 

Cook et al 2007 demonstrated ~ 40% decrease in laying time in replacement of time spent standing in the alley or stalls

5

Decrease body weight

Cook et al 2007 demonstrated ~ 40% decrease in laying time in replacement of time spent standing in the alley or stalls

6

Decreased conception rate 

De Rensis & Scaramuzzi 2003 stated 20-30% decrease

7

Decreased birth weight of calves (~5.5 kg less), immunoglobulin absorption (~15%), and on average 4.5 kg/day less 1st lactation future milk (Dahl, 2016)