Fertilization Rate and Number of Embryos on Day 2 after Intrauterine and Deep Intrauterine Insemination Using Frozen-Thawed Boar Semen in Multiparous Sows

Table 1

Means ± standard error of the mean (SEM) of weaning-to-oestrus interval, oestrus-to-ovulation interval, interval from last insemination to ovulation, interval from ovulation to slaughter, number of inseminations, number of ovulations, recovery rate, fertilization rate, percentage of sows having ≥1 embryo, conception rate and percentage of unilateral fertilization after intrauterine (IUI) and deep intra-uterine insemination (DIUI) using frozen-thawed boar semen in multiparous sows.

Parameters	Insemination procedure
	IUI	DIUI
Number of sows	6	6
Weaning-to-oestrus interval (h)	68.0 ±3.4^a	72.6 ± 6.4^a
Oestrus-to-ovulation interval (h)	48.6 ±3.1^a	50.3 ±5.8^a
Interval from last insemination to ovulation (h)	1.4 ±0.7^a	4.3 ± 1.9^a
Interval from ovulation to slaughter (h)	46.6 ±2.4^a	43.8 ±4.7^a
Number of inseminations	3.0 ±0.0^a	3.1 ±0.3^a
Number of ovulations	23.8 ±2.5^a	21.3 ±1.6^a
Number of embryos	13.5 ±2.7^a	5.5 ±3.2^a
Recovery rate (%)	85.3 (122/143)^a	82.0 (105/128)^a
Fertilization rate (%)	66.4 (81/122)^a	31.4 (33/105)^b
Left oviduct	70.9 (39/55)	26.7 (12/45)
Right oviduct	62.7 (42/67)	35.0 (21/60)
Percentage of sows having ≥1 embryo (%)	100.0 (6/6)^a	83.3 (5/6)^a
Conception rate (%)	83.3 (5/6)	33.3 (2/6)
Percentage of unilateral fertilization (%)	16.7 (1/6)	60 (3/5)

^a,bMeans with different superscripts within rows differed significantly (𝑃<.001).