Induction and synchronisation of oestrus in prepuberal gilts and anoestrous sows by a PMS-HCG-compound

Schilling, Erich; C̆erne, F.

doi:10.1136/vr.91.20.471

Cited by 45 publications

(17 citation statements)

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“…The range and level of ovulation rate achieved with PG600 were in agreement with those found in other studies using gilts of similar weights (Paterson and Lindsay, 1981;Paterson and Martin, 1981), but the failure of 10/22 of the gilts to show oestrus contrasts markedly with other studies (Schilling and Cerne, 1972;Paterson and Lindsay, 1981).…”

Section: Methodssupporting

confidence: 90%

“…puberty attainment, the degree of Evidence suggests that the prepubertal gilt synchronization of oestrus achieved may be m a y i n d e e d b y induced to ovulate with variable (Hughes, 1982). Schilling and Cerne (1972) reported fertilization rates of over 0-80 and litter sizes of 9-8 pigs per litter from gilts mated following induction of ovulation with a combination of 400 international unitst PMSG and 200 international unitst HCG; other workers, however, have reported unacceptably low fertilization rates and litter sizes using the same treatment (Miskovic, Simic, Jojkic and Stancic, 1977;Bielanski, 1978). Schilling and Cerne (1972) reported fertilization rates of over 0-80 and litter sizes of 9-8 pigs per litter from gilts mated following induction of ovulation with a combination of 400 international unitst PMSG and 200 international unitst HCG; other workers, however, have reported unacceptably low fertilization rates and litter sizes using the same treatment (Miskovic, Simic, Jojkic and Stancic, 1977;Bielanski, 1978).…”

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confidence: 99%

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Reproductive performance of gilts induced into puberty with oestradiol benzoate or a combination of pregnant mare's serum gonadotropin and human chorionic gonadotropin

et al. 1984

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The efficacy of a single injection of oestradiol benzoate, or a combination of pregnant mare's serum gonadotropin (PMSG) and human chorionic gonadotropin (HCG), for the induction of a fertile oestrus and ovulation in the prepubertal pig was investigated in two experiments.In the first experiment, 1·2 mg of oestradiol benzoate induced 21/23 gilts to ovulate, and 22/23 gilts showed oestrus and were inseminated on day 4 or 5 after treatment. At 28 days after insemination, 12 gilts were pregnant and carrying a mean of 7·1 (s.d. 3·3) live embryos, giving an embryonic survival rate of 0·703. All the 22 gilts treated with 400 international units PMSG plus 200 international units HCG as a single injection ovulated but only 10 showed oestrus and were inseminated. At 28 days after insemination, six gilts were pregnant with a mean of 13·0 (s.d. 5·8) live embryos, giving an embryonic survival rate of 0·583.In the second experiment, 9/11 oestradiol benzoate and 10/10 PMSG/HCG gilts ovulated in response to treatment. Oestrous detection and insemination were delayed until the expected time of the second oestrus, 20 to 30 days after treatment. Nine gilts (3 oestradiol benzoate, 6 PMSG/HCG) showed oestrus in this period and eight were inseminated. Five gilts were pregnant 28 days after insemination with a mean of 11·4 (s.d. 1·1) live embryos, giving an embryonic survival rate of 0·860.

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Section: Methodssupporting

confidence: 90%

mentioning

confidence: 99%

Reproductive performance of gilts induced into puberty with oestradiol benzoate or a combination of pregnant mare's serum gonadotropin and human chorionic gonadotropin

et al. 1984

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“…Our results are in agreement with other studies in that a combined injection of eCG and hCG could induce estrus and ovulation in 80 to 90% of prepubertal gilts within 3 to 7 days [16-19]. Furthermore, it is known that an injection of eCG can induce accessory corpora lutea at any stage of the estrous cycle [20-22].…”

Section: Discussionsupporting

confidence: 93%

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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“…Sows that lactated during the summer may there¬ fore have been in a deeper state of anoestrus at weaning, and the prolonged weaning-to-oestrus interval of these sows may reflect a slower response of the hypothalamus to removal of the inhibitory effects of suckling by the litter. Factors responsible for this delayed response by the hypothalamus are unclear and may involve higher brain centres because the ovary (Schilling & Cerne, 1972;King, Williams & Barker, 1982;Dial, Bevier, Hixon & Gustafsson, 1984), anterior pituitary and hypothalamus (Cox, Esbenshade & Britt, 1983;Dial et al, 1984) of chronically anoestrous sows are capable of responding to appropriate endocrine stimuli. Furthermore, Hurtgen & Leman (1979) and Britt, Esbenshade & Heller (1984) reported that exogenous stimulation (PMSG) at weaning hastened the onset of ovarian activity in primiparous sows weaned during summer.…”

Section: Discussionmentioning

confidence: 99%

Seasonal differences in function of the hypothalamic--hypophysial--ovarian axis in weaned primiparous sows

Armstrong¹,

Britt²,

Cox³

1986

Reproduction

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Summary. Primiparous sows were fed to appetite during lactations that occurred during winter or summer, and 11\m=.\4\m=+-\ 0\m=.\4 pigs per litter were weaned at 23\m=.\5\ m=+-\ 0\m=.\1 days of age. Sows were slaughtered at 0 or 72 h after weaning or blood samples were collected until 24 h after onset of oestrus. Sows that lactated during summer consumed less food and lost more (P < 0\m=.\05)weight, heartgirth and backfat than those that lactated during winter. Weaning-to-oestrus interval was greater (P < 0\m=.\05) in summer (224 \ m=+-\ 25 h) than in winter (93 \m=+-\ 13 h). Content of GnRH in the hypothalamus and concentrations of LH in the anterior pituitary and serum were lower (P < 0\m=.\05) after weaning in summer than winter. The numbers of visible ovarian follicles < 5 mm in diameter at weaning were lower (P < 0\m=.\05) in summer than in winter. In contrast to LH, FSH concentration in serum was higher (P < 0\m=.\10) in summer than winter, but FSH values in the anterior pituitary were lower (P < 0\m=.\05) in summer than in winter. Post-weaning patterns of secretion of oestradiol and follicular development differed between winter and summer. For example, in some sows weaned during the summer, transient surges of oestradiol occurred repeatedly during 0 to 280 h after weaning without provoking surges of LH. These results indicate that the period of post-weaning anoestrus in summer is prolonged because of altered activity of the hypothalamic\p=n-\ pituitary axis, possibly because of changes in sensitivity to the feedback of oestradiol. Lower feed intake during lactations that occur during summer may predispose the endocrine system to the aberrations.

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Induction and synchronisation of oestrus in prepuberal gilts and anoestrous sows by a PMS-HCG-compound

Cited by 45 publications

References 0 publications

Reproductive performance of gilts induced into puberty with oestradiol benzoate or a combination of pregnant mare's serum gonadotropin and human chorionic gonadotropin

Reproductive performance of gilts induced into puberty with oestradiol benzoate or a combination of pregnant mare's serum gonadotropin and human chorionic gonadotropin

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

Seasonal differences in function of the hypothalamic--hypophysial--ovarian axis in weaned primiparous sows

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