No reason to believe calf gains differed, but it appears that calf gains in the no fire treatment came at the expense of cow performance. Cows lost weight in continuously-grazed pastures without fire, presumably because they continued to make milk to support their calves while grazing a lower-quality forage base.
There are two different ways to ask questions of these data:
In a nutshell, cow gains on both PBG treatments are significantly different than no-fire, but PBG treatments are not different from each other:
Coefficient | SE | z | P | |
---|---|---|---|---|
Spring + Summer - No fire | 1.23 | 0.47 | 2.65 | 0.02 |
Spring only - No fire | 1.19 | 0.47 | 2.55 | 0.03 |
Spring only - Spring + Summer | -0.05 | 0.47 | -0.10 | 0.99 |
Gains on both PBG treatments were significantly different (greater) than zero, but gains on no-fire continous controls were not different than zero (and tended to be lower than zero).
Sum Sq | Mean Sq | NumDF | DenDF | F value | Pr(>F) | |
---|---|---|---|---|---|---|
No Fire |
0.66 | 0.66 | 1 | 11.97 | 3.14 | 0.1 |
Spring only |
1.2 | 1.2 | 1 | 12.02 | 5.71 | 0.03 |
Spring + Summer |
1.38 | 1.38 | 1 | 11.9 | 6.58 | 0.02 |