Table 3.
Maximum likelihood estimates (and their standard errors) of the direct effects of CFU* and SCC* on MILK* in the three structural equation models (a, b, c)
|
Models |
(a) |
|
(b) |
|
(c) |
|
|---|---|---|---|---|---|---|
| unrelated SCC*, CFU* | SCC* influence CFU* | CFU* influence SCC* | ||||
| |
CFU* |
SCC* |
CFU* |
SCC* |
CFU* |
SCC* |
| CFU* |
n.a. |
n.a. |
n.a. |
0.12 (0.11) |
n.a. |
n.a. |
| SCC* |
n.a. |
n.a. |
n.a. |
n.a. |
0.05 (0.06) |
n.a. |
| MILK* | −3.08 (1.72) | −9.82** (2.61) | −2.91 (1.74) | −9.78** (2.62) | −2.93 (0.74) | −9.78** (2.62) |
n.a. = non applicable; CFU*, SCC* and MILK* = latent variables for log-transformed CFU, log-transformed SCC, and milk yield, respectively; **p < 0.05.