Table 3.

Productive/reproductive parameters and metabolic/endocrine variables (LSM ± SE) for IGF-I genotypes of Holstein cows in two commercial farms.

	Farm 1 IGF-I genotype					Farm 2 IGF-I genotype
	AA	AB	BB	SM	AA	AB	BB	SM
Milk (L)	18.0	18.2	16.9	0.56	21.4	23.4	22.8	0.96
FCM (L)	15.9	16.2	15.0	0.51	19.7a	22.1b	21.9ab	1.05
Total solids (kg)	1.13	1.16	1.08	0.04	1.46a	1.62b	1.60ab	0.07
Calving 1st service (days)	85ab	73b	103a	10	85	81	77	5
Service/conception	2.2	2.5	2.2	0.3	1.5	1.4	1.5	0.2
Pregnancy rates	80	82	74	8	68	69	66	10
NEFA (mmol/L)	0.42a	0.41a	0.37b	0.01	0.32	0.36	0.34	0.03
BHB (mmol/L)	0.27a	0.27a	0.24b	0.01	0.62	0.66	0.56	0.07
Insulin (μUI/mL)	2.91a	3.19a	4.18b	0.27	2.60	2.55	2.60	0.42
IGF-I (ng/mL)	85.8	97.5	94.8	7.45	117.8	112.9	115.9	12.2
BCS	2.7	2.9	2.7	0.2	3.00	3.02	3.03	0.05

^ab Values marked with different letters are significantly different at P < 0.05