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. 2021 Jan 4;7(1):216–223. doi: 10.1016/j.aninu.2020.07.006

Table 3.

Effect of temperature-humidity index (THI) on dry matter intake (DMI) and milk performance of Holstein lactating cows.

Item THI periods1
 P-value
LTHI (42.97) MTHI (61.84) HTHI (86.09)
DMI, kg/d 30.46 ± 0.33a 27.43 ± 0.22b 22.07 ± 0.30c <0.001
Milk yield, kg/d 21.06 ± 0.91b 23.91 ± 0.31a 15.86 ± 0.12c <0.001
4% FCM2, kg/d 22.41 ± 0.49a 23.69 ± 0.64a 15.23 ± 0.31b <0.001
Protein, % 3.07 ± 0.07 3.01 ± 0.07 3.24 ± 0.08 0.183
Fat, % 4.42 ± 0.15a 4.04 ± 0.15ab 3.74 ± 0.05b 0.061
Lactose, % 5.08 ± 0.05 5.13 ± 0.03 5.09 ± 0.05 0.711
Protein yield, kg/d 0.65 ± 0.02a 0.71 ± 0.02a 0.51 ± 0.01b <0.001
Fat yield, kg/d 0.93 ± 0.03a 0.95 ± 0.04a 0.59 ± 0.01b <0.001
Lactose yield, kg/d 1.07 ± 0.01b 1.23 ± 0.02a 0.81 ± 0.01c <0.001

LTHI = low THI; MTHI = moderate THI; HTHI = high THI; FCM = fat-corrected milk.

a-c Means within a row with different superscripts differ (P < 0.05).

1

The data in parentheses were the average THI value.

2

4%FCM, fat-corrected milk, calculated according to NRC (2001).