Table 1.

Factors associated to pregnancy (P/ET) on days 30 and 60, and calving rate in buffalo recipients.

		P/ET				Calving rate
	N	30 days	OR (95% CI)*	60 days	OR (95% CI)	Calving	OR (95% CI)
Season
Breeding season	80	35.0	Ref.#	35.0	Ref.	33.8	Ref.
Nonbreeding season	104	45.2	1.53 (0.84–2.79)	39.4	1.21 (0.66–2.21)	28.9	0.80 (0.43–1.49)
Recipient parity
Cow	134	40.3	Ref.	36.6	Ref.	28.4	Ref.
Heifer	49	40.8	1.02 (0.56–1.99)	38.8	1.10 (0.56–2.16)	36.7	1.47 (0.74–2.93)
Protocol
Ovsynch	36	36.1b	Ref.	36.1b	Ref.	33.3	Ref.
P4 + EB$	148	41.9a	1.28 (0.6–2.71)	37.8a	1.08 (0.51–2.30)	30.4	0.87 (0.40–1.90)
CL diameter
<14.5 mm	83	32.5B	Ref.	27.7B	Ref.	21.7B	Ref.
≥14.5 mm	95	47.4A	1.87 (1.01–3.44)	45.3A	2.16 (1.15–4.04)	37.9A	2.20 (1.13–4.29)
Asynchrony
0	47	34.0	Ref.	29.8	Ref.	21.3	Ref.
+1	122	42.6	1.44 (0.71–2.90)	40.2	1.58 (0.77–3.26)	34.4	1.94 (0.88–4.29)
Day of recipient estrous cycle
7	73	41.1	Ref.	38.4	Ref.	31.5	Ref.
6	111	40.5	0.98 (0.54–1.78)	36.9	0.94 (0.51–1.73)	30.6	0.96 (0.51–1.82)
Embryo
Vitrified	70	37.1	Ref.	31.4	Ref.	24.3	Ref.
Fresh	114	43.0	1.28 (0.69–2.35)	41.2	1.53 (0.82–2.87)	35.1	1.69 (0.86–3.29)
Day of embryo development
6	114	36.5	Ref.	33.1	Ref.	26.1	Ref.
5	55	48.2	1.61 (0.84–3.11)	46.3	1.75 (0.90–3.38)	40.7	1.95 (0.98–3.86)
Embryo stage
Expanded blastocyst	135	40.7	Ref.	37.8	Ref.	30.4	Ref.
Blastocyst	18	44.4	1.16 (0.43–3.14)	38.9	1.05 (0.38–2.88)	38.9	1.46 (0.53–4.03)
Early blastocyst	15	33.3	0.73 (0.24–2.25)	33.3	0.82 (0.27–2.55)	26.7	0.83 (0.25–2.77)

^*OR, odds ratio; CI, confidence interval.

^#Ref., reference point odds ratio = 1.0.

^$P4 + EB: progesterone associated to estradiol plus eCG protocol.

A ≠ B (P ≤ 0.05); a ≠ b (0.05 ≤ P ≤ 0.10).