Ovarian activity and uterus organometry in delayed puberty gilts

Stančić, Ivan; STANČIĆ, BLAGOJE; Božić, Aleksandar; Anderson, Robin C.; Harvey, Roger B.; Gvozdić, Dragan

doi:10.1016/j.theriogenology.2011.05.004

Cited by 22 publications

(25 citation statements)

References 10 publications

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“…; Stancic et al . ). Failure of gilts to exhibit estrus signs rather than delayed puberty contributes to a substantial number of pigs removed because most impubertal gilts examined at this time have had one or more ovarian cycles (Stancic et al .…”

Section: Summary Of Marker Results For Delayed Puberty In Giltsmentioning

confidence: 97%

Genome‐wide association with delayed puberty in swine

et al. 2013

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An improvement in the proportion of gilts entering the herd that farrow a litter would increase overall herd performance and profitability. A significant proportion (10-30%) of gilts that enter the herd never farrow a litter; reproductive reasons account for approximately a third of gilt removals, with anestrous and failure to conceive the most common reasons for culling. Tools to select gilts for reproductive longevity through genomics or alternative phenotypes would be of great benefit to the producer. Ninety-one gilts that failed to display behavioral estrus by 240 days (cases) and 127 pubertal littermates (controls) were genotyped with the Illumina Porcine SNP60 Beadchip. One hundred and seventy-four SNPs with the most significant associations were genotyped in an additional 86 cases and 103 controls. Twelve of these associations were significant in the final analysis. The most significant (P < 1.5 × 10(-14) ) region associated with failure to attain puberty was on chromosome 4 surrounding the NHLH2 gene. Delayed pubertal development and age at first estrus have been associated with NHLH2 in mice. Because attainment of puberty is a complex trait, identifying genes that affect pubertal age would greatly contribute to our knowledge of reproductive development as well as overall fertility.

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Section: Summary Of Marker Results For Delayed Puberty In Giltsmentioning

confidence: 97%

Genome‐wide association with delayed puberty in swine

et al. 2013

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“…Functional structures such as PoF, CH, CL, and CA present on the ovaries, would indicate that a gilt is sexually mature and cyclic, whereas a gilt would be acyclic if ovarian follicles were ≤ 7 mm in diameter [12,13,26,27]. …”

Section: Discussionmentioning

confidence: 99%

“…delayed puberty (when estrus is not detected in gilts older than 8 months of age) is the most common reason for culling gilts from the breeding herds [8,9]. However, post mortem examination of reproductive organs has shown that many delayed puberty gilts actually have cyclic ovarian activity [10-13]. Based on these finding, it can be concluded that such gilts are not truly prepubertal anestrous.…”

Section: Introductionmentioning

confidence: 99%

Ovarian reaction and estrus manifestation in delayed puberty gilts after treatment with equine chorionic gonadotropin

Stančić

Bošnjak

Radović

et al. 2012

Reprod Biol Endocrinol

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BackgroundProlonged pre-insemination anestrus (i.e. delayed puberty) is a major contributing factor for culling up to 30% of the replacement gilts at large breeding farm units in Vojvodina. It is imperative to determine if these gilts are acyclic (prepubertal) or cyclic, but just fail to exhibit behavioural estrus. Recent investigations demonstrate that treatment with equine chorionic gonadotropin (eCG) can increase the diestrous phase duration in sexually mature gilts. Based on these finding, the aim of the present studies was to determine the reproductive status of delayed puberty gilts following injection with eCG.MethodsTwo experiments were conducted on a swine breeding farm in Vojvodina. In Exp. 1, 20 prepubertal (acyclic) gilts, and 120 sexually mature (cyclic) gilts were injected with a single injection of 400 IU eCG + 200 IU human chorionic gonadotropin (hCG) or with 1000 IU eCG (cyclic gilts), at d5, d11 or d17 after spontaneous estrus detection, to determine their ovarian reaction and induced estrus manifestation. In Exp. 2, sixty delayed puberty gilts (estrus not detected until 8 month of age, av. 258 days) were culled from breeding herd and slaughtered to determine their reproductive status based on ovarian anatomical features. The second group of gilts (n = 60) was treated with a single 1000 IU eCG injection to determine their reproductive status, based on the interval between eCG injection to estrus detection and duration. The data were analyzed by descriptive statistics, t-test, analysis of variance and Duncan’s test in the software package Statistics 10th.ResultsOvulations were induced in 90% of acyclic (sexually immature) and, on average, 93.3% of cyclic (sexually mature) gilts after the eCG injection. On average, 4 days after the eCG injection, estrus was detected in 85% of the treated acyclic (sexually immature) gilts and in 95% (19/20) of the cyclic (sexually mature) gilts, treated with eCG on day 17 after spontaneous estrus detection. The interval from eCG to induced estrus detection was prolonged (av. 25 days) in 95% (19/20) of the sexually mature gilts treated with eCG on day 5 and in 90% (18/20) of gilts treated on day 11 after spontaneous estrus detection (Exp. 1). Forty anestrous gilts reached cyclic pubertal ovarian activity. Estrus manifestation was detected in 56 gilts (93.3% of the total 60 treated prolonged anestrous gilts, av. 259 days of age), after a single 1000 IU eCG injection. Thirty-four gilts (60.7% of the total gilts in estrus) with prolonged eCG to estrus interval (av. 24.7 days) were considered spontaneously cyclic (sexually mature), but behaviourally anestrous before treatment. The remaining 22 (39.3% of the total gilts in estrus) were considered truly sexually immature (acyclic) before the treatment or were eCG injected in the late luteal or proestrous phase of spontaneous estrous cycle (Exp. 2).ConclusionsIn 66.7% of the delayed puberty gilts, pre-ovulatory follicles (PoF), corpora hemorrhagica (CH), corpora lutea (CL), or corpora albicantia (CA) were found on the ovar...

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“…In physiological terms, the moment of reaching sexual maturity (puberty) is defined by the appearance of the first ovulation and the establishment of the first estrous cycle in normal duration (18-24 days), or a gilts' ability to establish and maintain a normal pregnancy, after insemination (Dyck, 1988). However, a large number of gilts, culled from breeding because of long-term prepuberty anoestrus, had established a normal cyclical ovarian activity, as shown by the results of morphological examination of their ovaries post-mortem (Stančić et al, 2011). Modern technology of ultrasound diagnosis of ovarian cyclicity, pregnancy and pathological changes in the reproductive organs of gilts and sows is a very precise method (Moeller, 2002;Williams et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Ovulation Rate in Gilts Treated with Different Hormone Protocols

Stančić

Bošnjak

Apić

et al. 2017

AGR

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In this study different hormonal protocols were used, in order to determine their effectiveness in ovulation value rated postmortem by the inspection of the ovaries of treated gilts. The total of 48 prepubertal Swedish Landrace gilts were used in the study, aged 150 to 160 days, 30 sexually mature gilts, aged 180 to 210 days, with a pre-established one spontaneous estrus (first pubertal), 30 gilts aged 210 to 240 days, with a determined two spontaneous (first and second pubertal) estrus, and 40 long-term anestric gilts, aged 280 to 290 days. The following hormone protocols were conducted: 400 I.U. eCGone-time; 750 I.U. ECG -one time; 1000 IU eCG-one-time; 1500 IU eCGone-time; 250 ηg PGF2α-one time; 20 mg Altrenogest and the combination of 20 mg Altrenogest and 1,000 I.U. eCG at the end of treatment with altrenogest. An overview of the reproductive organs of slaughtered gilts was carried out in the Laboratory for Reproduction of Domestic Animals at the Faculty of Agriculture, Novi Sad. It was found that the ovulation value of the treated gilts depends primarily on the dose of ECG and reproductive status of gilts at the moment of initiation of hormone treatment.

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Ovarian activity and uterus organometry in delayed puberty gilts

Cited by 22 publications

References 10 publications

Genome‐wide association with delayed puberty in swine

Genome‐wide association with delayed puberty in swine

Ovarian reaction and estrus manifestation in delayed puberty gilts after treatment with equine chorionic gonadotropin

Ovulation Rate in Gilts Treated with Different Hormone Protocols

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