Follicular dynamic and reproductive performance of gilts submitted to estrous cycle synchronization using two different progestogen sources

Quirino, Monike; Ulguim, Rafael da Rosa; Bernardi, Mari Lourdes; Pereira, Victória Nunes; Magoga, Joana; Gianluppi, Rafael Dal Forno; Mellagi, Ana Paula Gonçalves; Gasperin, Bernardo Garziera; Bortolozzo, Fernando Pandolfo

doi:10.1016/j.theriogenology.2020.08.035

Cited by 5 publications

(2 citation statements)

References 33 publications

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“…Therefore, developing alternatives for daily oral progestogen application is crucial. An intravaginal device impregnated with medroxyprogesterone acetate was recently evaluated in gilts (Quirino et al, 2020; Ulguim et al, 2019). Despite the interesting results, technological adjustments must be performed to improve the reproductive results.…”

Section: Sow Fertilitymentioning

confidence: 99%

Update on artificial insemination: Semen, techniques, and sow fertility

Mellagi

Will

Quirino

et al. 2022

Molecular Reproduction Devel

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Over the years, reproductive efficiency in the swine industry has focused on reducing the sperm cell number required per sow. Recent advances have included the identification of subfertile boars, new studies in extended semen quality control, new catheters and cannulas for intrauterine artificial insemination (AI), and fixed‐time AI under commercial use. Therefore, it is essential to link field demands with scientific studies. In this review, we intend to discuss the current status of porcine AI, pointing out challenges and opportunities to improve reproductive efficiency.

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Section: Sow Fertilitymentioning

confidence: 99%

Update on artificial insemination: Semen, techniques, and sow fertility

Mellagi

Will

Quirino

et al. 2022

Molecular Reproduction Devel

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“…Gilts often stay in the gilt replacement pool for three to four estrous cycles before they are detected in estrus at the right time to fit into a breeding group [ 3 ]. The hormonal synchronization of estrus is a management strategy that facilitates the introduction of breeding-eligible females into insemination groups [ 4 ]. Therefore, the development of alternative estrus synchronization protocols that optimize labor and time would benefit pig production.…”

Section: Introductionmentioning

confidence: 99%

Estrus Synchronization of Replacement Gilts Using Estradiol Cipionate and PGF2α and Its Effects on Reproductive Outcomes

Leal

Viana

Almond

et al. 2022

Animals

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In this study, we evaluated the effectiveness of using estrogen-induced prolonged luteal function followed by prostaglandin F2 alpha (PGF2α) treatment to synchronize estrus in gilts. On day12 of the estrus cycle (D0 = first day of standing estrus), 52 gilts were assigned at random to two experimental groups: non-treated gilts (CON, n = 22), serving as controls, and prolonged luteal function group (CYP, n = 30), receiving a single treatment with 10 mg of estradiol cypionate intramuscularly Starting on day 12, blood samples were collected for estradiol and progesterone assays. Estrus detection started on day 17. Gilts from the CON group were inseminated at the onset of natural estrus. On day 28 CYP gilts were treated with PGF2α to induce luteolysis and inseminated at the onset of estrus. Gilts were slaughtered 5 d after the last insemination. A single treatment with estradiol cypionate prolonged luteal function in 90% of treated gilts. The duration of the estrous cycle was longer (p < 0.0001) for CYP gilts compared to CON gilts. CYP gilts showed synchronized estrus 3.96 ± 0.19 d after induction of luteolysis. The conception rate was similar (p = 0.10) for CON and CYP gilts. No difference was observed in the embryo recovery rate (p = 0.18) and total number of embryos per female (p = 0.06). The percentage of unfertilized oocytes, fragmented embryos and viable embryos was similar among females from CON and CYP groups (p > 0.05). The treatment of gilts with a single application of 10 mg of estradiol cypionate on day 12 of the estrous cycle was effective in prolonging luteal function and treatment with PGF2α resulted in synchronized estrus. Additionally, the synchronization protocol had no deleterious effect on fertility and embryonic development.

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