Table 3. Comparative performance of serum pH in Holstein and Jersey cows by THI range

THI	Holstein	Jersey	Total¹⁾	PSEM	p-value
THI	Holstein	Jersey	Total¹⁾	PSEM	THI	Breed	THI × Breed
61–63	7.376^e	7.421^a	7.395^d	0.024	0.365	< 0.001	< 0.001
64–66	7.432^cd	7.401^a	7.420^cd	0.013	0.270
67–69	7.465^bc	7.429^a	7.460^bc	0.012	0.273
70–72	7.502^b^x	7.409^a^y	7.485^b	0.010	0.000
73–75	7.443^cd^x	7.417^a^y	7.438^cd	0.008	0.232
76–78	7.471^bc^a	7.385^ab^y	7.451^bc	0.009	0.000
79–81	7.606^a^x	7.383^ab^y	7.548^a	0.024	0.000
82–84	7.409^de^x	7.327^by	7.399^d	0.009	0.000

Values are expressed as the mean ± SEM of 7 dairy cows in each group.
Values are the average of data for both breeds in the same THI ranges.
Denote comparisons made within (same breed) columns.
Denote comparisons made between Holstein and Jersey cows in the same THI ranges.
THI, temperature-humidity index; PSEM, pooled standard error of the mean.