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.

ParametersInsemination procedure
IUIDIUI

Number of sows66
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 inseminations3.0 ± 0 . 0 a 3.1 ± 0 . 3 a
Number of ovulations23.8 ± 2 . 5 a 21.3 ± 1 . 6 a
Number of embryos13.5 ± 2 . 7 a 5.5 ± 3 . 2 a
Recovery rate (%)85.3 ( 1 2 2 / 1 4 3 ) a 82.0 ( 1 0 5 / 1 2 8 ) a
Fertilization rate (%)66.4 ( 8 1 / 1 2 2 ) a 31.4 ( 3 3 / 1 0 5 ) b
 Left oviduct70.9 (39/55)26.7 (12/45)
 Right oviduct62.7 (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 , b M e a n s with different superscripts within rows differed significantly ( 𝑃 < . 0 0 1 ).