The effect of unilateral ovariectomy on early embryonic survival and embryo development in rabbits

Peiró, Rosa; Gallego, M J; Blasco, A.; Santacreu, M. A.

doi:10.4995/wrs.2014.2105

Cited by 6 publications

(5 citation statements)

References 22 publications

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“…However, comparing both groups, Synthetic line showed a lower percentage of normal embryos (95 vs. 98%) and a higher percentage of abnormal embryos (5 vs. 2%). It appears that an increasing ovulation rate is accompanied by an increase in number of abnormal embryos due to decreasing quality of oocytes, which is in agreement with other studies (Angel et al, 2014;Peiró et al, 2014). In fact, it has been shown that embryonic losses, number of oocytes and degenerated embryos are increased as ovulation rate rises (Angel et al, 2014).…”

Section: Discussionsupporting

confidence: 90%

Ovulation rate and early embryonic survival rate in female rabbits of a synthetic line and a local Algerian population

et al. 2016

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A higher litter size at birth has been reported in female rabbits from a Synthetic line than in those of the Local Algerian population. The aim of this work was to analyse whether this difference in litter size was due to a higher ovulation rate and/or embryonic survival rate in Synthetic line than in Local Algerian population. In total, 24 multiparous female rabbits from Synthetic line and 23 from Local population were used in this experiment. Litter size at birth was recorded up to the first 3 parities. Litter size was 20% higher in Synthetic line than Local population. At their 4 th gestation, the females were euthanized at 72 h post coitum. Synthetic line females had 50% more ova and embryos than those of Local population (+4.42 ova and +3.92 embryos, respectively). Synthetic line displayed a lower percentage of normal embryos and a larger number of unfertilized oocytes than Local population (-2.81% and +0.64 oocytes, respectively), but differences were not relevant. Synthetic line showed a lesser embryonic stage of development at 72 h post coitum, showing a higher percentage of early morulae (31.50 vs. 8.50%) and a lower percentage of compact morulae (51.45 vs. 78.65%) than Local population. No relevant difference was found for early embryonic survival rate between Synthetic line and Local population. In conclusion, the difference in litter size was mainly due to a higher ovulation rate in the Synthetic line, allowing more embryos to develop in this line.

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Section: Discussionsupporting

confidence: 90%

Ovulation rate and early embryonic survival rate in female rabbits of a synthetic line and a local Algerian population

et al. 2016

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“…Litter size is limited by several components of traits such as ovulation rate, fertilisation and prenatal mortality (see review in Blasco et al, 1993a). Fertilisation rate is generally high, exceeding 90 to 95% (Peiró et al, 2014), and is therefore not considered a constraining component of litter size (Belabbas et al, 2016). However, ovulation rate is, together with pre and postimplantation mortality, the foremost component of litter size, and is also a limiting factor for its improvement (Laborda et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

“…However, ovulation rate is, together with pre and postimplantation mortality, the foremost component of litter size, and is also a limiting factor for its improvement (Laborda et al, 2011). Preimplantation losses are mainly related to the embryo's viability related to chromosomal abnormalities, oocyte quality or embryonic development (Fechheimer and Beatty, 1974;Pope et al, 1990) and to the quality of oviduct and uterine secretions (Peiró et al, 2014). After implantation, the losses are related to the placenta development and uterine capacity of the female (Argente et al, 2003…”

Section: Introductionmentioning

confidence: 99%

Litter size components traits in two Algerian rabbit lines

et al. 2021

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The aim of this study was to estimate the limiting litter size components in rabbit females from a Synthetic line (n=32) and a Local population (n=34). Ovulation rate, number of implanted and live embryos were counted by laparoscopy at 12 d after mating. Prolificacy (total newborn, number born alive and mortality) and embryonic, foetal and prenatal survival at day of birth of the 3rd gestation were measured. The analysed traits were body weight of the female at mating, ovulation rate, implanted, live and resorbed embryos, embryonic, foetal and prenatal survival, as well as total newborn, number born alive and mortality at birth. Synthetic line females had a higher ovulation rate compared to the Local population (11.03±0.23 vs. 8.41±0.23 corpora lutea; P<0.0001). Synthetic line displayed a higher number of implanted embryos (10.00±0.25 vs. 7.85±0.25 embryos; P<0.0001). No difference was found between groups for number of resorbed embryos. Similar embryonic, foetal and prenatal survival rates were reported between the Synthetic line and the Local population. Additionally, total newborn was higher in the Synthetic line than in the Local population (+1.46 kits; P<0.05). A principal components analysis was performed. The first four principal components (PC) explained more than 90% of the total variation in both lines. Total newborn, number born alive and live embryos were the main variables defining the 1st PC. Resorbed embryos and foetal survival were located in the 2nd PC. Ovulation rate and embryonic survival were the predominant variables defining the 3rd PC. The body weight of females was located in the 4th PC. The phenotypic correlation between total newborn and its components were high and positive in both lines, except for ovulation rate and total newborn, where it was moderate in Synthetic line. In conclusion, the females from Synthetic line have a higher total newborn than those from Local population, as a consequence of a higher number of released oocytes and embryos that successfully reach implantation. However, a higher uterine crowding in Synthetic line seems to limit survival of foetuses that reach term of gestation, while ovulation rate is the principal limiting factor of total newborn in Local population.

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“…In rabbits, no differences were observed in either embryo quality or survival rates between intact and unilaterally ovariectomised females (Peiro et al 2014 ). This suggested that unilateral ovariectomy was not associated with any physiological or hormonal imbalance leading to increased embryo loss (Peiro et al 2014 ). It further suggested that fertility in various species is apparently unaffected by unilateral ovariectomy.…”

Section: Introductionmentioning

confidence: 99%

Unilateral salpingectomy in Sprague Dawley rats and its effect on litter size

Bester

Schulman

Kirberger

et al. 2021

J. S. Afr. Vet. Assoc.

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The study described a novel, rapidly performed, successful and safe surgical procedure in rats to achieve a reduction in the number of conceptuses. The objectives were to investigate the total foetal count and foetal health in both uterine horns after unilateral salpingectomy compared to the control group. Sixteen female Sprague-Dawley rats ( Rattus norvegicus ) were allocated to the study of which 10 rats underwent unilateral salpingectomy with six controls before all 16 were mated at 8–10 weeks of age. Gestational length was taken as 22 days, determined from the day of appearance of the copulatory plug. The female rats were terminated on day 19 or 20 of the gestational period. The foetuses in each horn were mapped and counted for comparison between the salpingectomy and control groups. The gravid uteri, individual foetal weights and placental weights were measured and compared between the two groups. This study described a novel, rapidly performed, successful and safe surgical procedure in rats. The mean number of foetuses in the salpingectomy group was significantly smaller than the control group. No significant differences in foetal and placental development were observed between the groups. These observations support future investigation of unilateral salpingectomy in other species as an alternative surgical method for population control.

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The effect of unilateral ovariectomy on early embryonic survival and embryo development in rabbits

Cited by 6 publications

References 22 publications

Ovulation rate and early embryonic survival rate in female rabbits of a synthetic line and a local Algerian population

Ovulation rate and early embryonic survival rate in female rabbits of a synthetic line and a local Algerian population

Litter size components traits in two Algerian rabbit lines

Unilateral salpingectomy in Sprague Dawley rats and its effect on litter size

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