Table 5.

Blood plasma analytes least square means (confidence interval) across the performance evaluation test in pregnant heifers by feed efficiency group repeatedly sampled.

Traits (Abbreviation; Unit)	Efficient	Inefficient	p-Value
Enzymes
Alkaline phosphatase (ALP; U/L)	112 (97.9, 155)	71.2 (62.6, 82.6)	<0.01
Aspartate aminotransferase (AST; U/L)	55.4 (52.6, 58.2)	58.4 (55.5, 61.3)	0.14
Creatine kinase (CK; U/L)	131 (122, 143)	143 (132, 158)	0.14
Gamma glutamyl transferase (GGT; U/L)	16.2 (15.1, 17.4)	16.2 (15.0, 17.4)	0.98
Glutamate dehydrogenase (GLDH; U/L)	14.3 (12.1, 17.0)	16.3 (13.7, 19.3)	0.30
Compounds
Albumin (g/L)	33.7 (33.2, 34.3)	33.9 (33.3, 34.5)	0.61
Albumin globulin ratio	1.02 (0.98, 1.06)	0.97 (0.93, 1.01)	0.07
Beta hydroxy butarate acid (BHBA; µmol/L)	161 (148, 176)	166 (151, 181)	0.67
Carbon dioxide (CO2; mmol/L)	22.9 (22.2, 23.6)	22.3 (21.6, 23.0)	0.22
Cholesterol (mmol/L)	2.68 (2.40, 2.97)	3.42 (3.13, 3.72)	<0.01
Creatinine (µmol/L)	131 (123, 140)	120 (111, 128)	0.05
Globulin (g/L)	33.7 (32.5, 34.7)	35.6 (34.4, 36.7)	0.02
Glucose (mmol/L)	3.96 (3.87, 4.05)	3.93 (3.84, 4.02)	0.62
Non-esterified fatty acids (NEFA: mmol/L)	0.34 (0.30, 0.38)	0.24 (0.21, 0.28)	<0.01
Urea (mmol/L)	2.74 (2.59, 2.89)	2.57 (2.43, 2.72)	0.10
Ions
Anion Gap (mmol/L)	26.5 (25.8, 27.3)	26.6 (25.8, 27.3)	0.99
Calcium (mmol/L)	2.37 (2.34, 2.40)	2.42 (2.38, 2.45)	0.06
Chloride (mmol/L)	96.6 (95.8, 97.3)	96.5 (95.7, 97.3)	0.95
Magnesium (mmol/L)	0.88 (0.85, 0.91)	0.89 (0.87, 0.92)	0.54
Osmolality (mmol/L)	278 (277, 279)	277 (275, 278)	0.20
Potassium (mmol/L)	4.15 (4.06, 4.24)	4.24 (4.15, 4.34)	0.15
Phosphorus (mmol/L)	2.02 (1.91, 2.14)	1.97 (1.86, 2.09)	0.52
Sodium (mmol/L)	141 (141, 141)	141 (140, 142)	0.20
Hormone
Triiodothyronine (T3; nmol/L)	1.83 (1.70, 1.95)	1.71 (1.58, 1.84)	0.20