Table 4. Analysis of age at test, parity, and cumulative days in milk by year
Conventional feed
Low-methane feed
sig
2021
2022
2023
Age at test (mouths)
49.5±16.8
a
50.7±19.4
a
51.2±18.9
a
ns
Parity
2.2±1.1
b
2.3±1.3
ab
2.4±1.3
a
*
Cumulative days in milk (days)
185.7±119.8
a
169.3±109.7
b
184.6±121.9
a
ns
Values are mean±SD.
p
<0.05
values with different superscripts in the same row differ significantly.
NS, not significant.