Figure 1.
Figure 1.

Pattern of change during lactation of γ-glutamyl transferase (GGT) activity in the defatted milk of cows categorized according to the average GGT activity of defatted milk during lactation (line with empty circles: least squares means of cows with greater average GGT activity; lines with black triangles: least squares means of cows with lower average GGT activity). Vertical bars represent SEM. DIM, days in milk.

 


Figure 2.
Figure 2.

Pattern of change during lactation of milk yield (continuous line) and DMI (dotted line) of cows categorized according to the average γ-glutamyl transferase (GGT) activity of defatted milk during lactation (line with empty circles: least squares means of cows with greater average GGT activity; lines with black triangles: least squares means of cows with lower average GGT activity). Vertical bars represent SEM. DIM, days in milk.

 


Figure 3.
Figure 3.

Pattern of change during lactation of milk fat (a), milk protein (b), and lactose (c) of cows categorized according to the average γ-glutamyl transferase (GGT) activity of defatted milk during lactation (line with empty circles: least squares means of cows with greater average GGT activity; lines with black triangles: least squares means of cows with lower average GGT activity). Vertical bars represent SEM. DIM, days in milk.

 


Figure 4.
Figure 4.

(a) Score plot of principal components analysis (PCA)-analyzed milk samples from the cows involved in the research (cows categorized according to the average γ-glutamyl transferase [GGT] activity of defatted milk during lactation: empty circles represent cows with greater average GGT activity; filled triangles represent cows with lower average GGT activity) using the first 2 principal components (PC1 and PC2). (b) Loading plot of the first 2 (PC1 and PC2) principal components (RCT, rennet coagulation time; k20, curd firming rate; a30, curd firmness; SH, titratable acidity). DIM, days in milk; MY, milk yield; SCC, somatic cell count.

 


Figure 5.
Figure 5.

Pattern of change during lactation of plasma glucose (a) and plasma urea (b) of cows categorized according to the average γ-glutamyl transferase (GGT) activity of defatted milk during lactation (line with empty circles: least squares means of cows with greater average GGT activity; lines with black triangles: least squares means of cows with lower average GGT activity). Vertical bars represent SEM. DIM, days in milk.