Control of oestrus in gilts II. Synchronization of oestrus with a progestagen, altrenogest (Regumate): Effect on fertility and litter size

Martinat-Botté, F.; Bariteau, F.; Forgerit, Yvonnick; Macar, C.; Moreau, Ana Maria Souza dos Santos; Terqui, M.; Signoret, J.P.

doi:10.1016/0378-4320(90)90063-l

Cited by 31 publications

(17 citation statements)

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“…For subsequent reproductive performances, a tendency of increased in litter size (NTB, 11.0 ± 2.1 piglets in group B vs 9.3 ± 3.1 in group A) was found in the present study, which is in agreement with other studies (Martinat‐Botté et al. 1990, 1995).…”

Section: Discussionsupporting

confidence: 93%

“…To our knowledge, this is the first study reported about the follicular size at standing oestrus, at 16 h after standing oestrus and pre-ovulatory follicular size, as well as the ovulation time of the progestin altrenogest treatment in the gilts. For subsequent reproductive performances, a tendency of increased in litter size (NTB, 11.0 ± 2.1 piglets in group B vs 9.3 ± 3.1 in group A) was found in the present study, which is in agreement with other studies (Martinat-Botte´et al 1990, 1995. The increase in litter size found in the present study might be due to an increased ovulation rate after the progestin altrenogest treatment (Martinat-Botte´et al 1995;Estienne et al 2001).…”

Section: Discussionsupporting

confidence: 92%

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Study on the Oestrous Synchronization in Gilts by Using Progestin Altrenogest and hCG: Its Effect on the Follicular Development, Ovulation Time and Subsequent Reproductive Performance

Kaeoket¹

2007

Reprod Domestic Animals

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The aim of this study was to further investigate the effect of using progestin altrenogest and hCG to synchronize the oestrous cycle and its effect on follicular development, ovulation time and subsequent reproductive performance. Thirty crossbred gilts were divided into three groups. Group A (control) received a 5 ml of normal saline for 18 consecutive days by individually top-dressing. Groups B and C gilts received 20 mg (5 ml) of progestin altrenogest for 18 consecutive days by individually top-dressing. On day 3 (72 h) after withdrawal of progestin altrenogest, Group C gilts received hCG (500 IU, im). The follicular development and ovulation time were examined by transabdominal ultrasonography. Subsequent reproductive performances, i.e. number of total born per litter (NTB), number of live born per litter (NBA), number of stillbirth per litter (NSB), average piglet birth weight (ABW), lactation length (LL) and weaning to oestrous interval (WOI), were recorded. None of the gilts in Group A showed oestrus within 10 days after withdrawal of normal saline. Groups B (eight of 10) and C gilts (four of 10) came into oestrus at 5.6 +/- 0.5 and 6.5 +/- 0.6 days after withdrawal of progestin altrenogest, respectively. The ovulation time of Groups B and C gilts took placed at 25.0 +/- 4.7 and 25.0 +/- 5.0 h after standing oestrus, respectively. The pre-ovulatory follicular size (diameter) of Groups B and C gilts was 8.0 +/- 2.0 and 11.0 +/- 3.0 mm, respectively. A tendency of larger litter size (NTB) in Group B gilts was found when compared with Group A gilts. To conclude, using progestin altrenogest alone can be used to synchronize the oestrous cycle in gilts without unenthusiastic effect on the follicular development, ovulation time and subsequent reproductive performances. However, treatment of gilts with hCG at day 3 (72 h) after withdrawal of altrenogest had unenthusiastic effect on oestrus synchronization.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionsupporting

confidence: 92%

Study on the Oestrous Synchronization in Gilts by Using Progestin Altrenogest and hCG: Its Effect on the Follicular Development, Ovulation Time and Subsequent Reproductive Performance

Kaeoket¹

2007

Reprod Domestic Animals

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“…However, with few exceptions, treatment of weaned sows with hCG, GnRH, or pLH have been subsequent to a gonadotrophic treatment at weaning to stimulate follicular growth. Such treatments at weaning have been associated with increased embryo mortality due to the poorer oocyte quality (Guthrie et al 1974;Martinat-Botté et al 1990). …”

Section: Introductionmentioning

confidence: 99%

Effect of the administration of GnRH or hCG on time of ovulation and the onset of estrus-to-ovulation interval in sows in Thailand

Wongkaweewit

Prommachart

Raksasub

et al. 2011

Trop Anim Health Prod

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The aim of the present study was to evaluate the control of ovulation by the administration of human chorionic gonadotropin (hCG) or gonadotropin-releasing hormone (GnRH) at the onset of estrus. Thirty-three multiparous sows housed under tropical conditions and showing standing estrus within 5 days after weaning were included. The sows were allocated to three groups, spontaneous ovulation (control group, n = 10), induced ovulation using 750 IU hCG (hCG group, n = 10), and induced ovulation using 50 μg GnRH (GnRH group, n = 13). The hormones were given at the onset of estrus and the occurrence of ovulation was monitored every 6 h by transrectal ultrasonography. Data for weaning-to-estrus interval, onset of estrus-to-ovulation interval (EOI), and the length of estrus were recorded. All sows in the control and hCG groups ovulated, while 3 out of 13 sows treated with GnRH developed cystic ovaries (did not ovulate). Of those sows ovulating, the EOI of the hCG (40.2 ± 1.7 h) and GnRH (37.5 ± 3.3 h) groups were shorter than that of the control group (63.6 ± 9.6 h; P < 0.05). In conclusion, the administration of either hCG or GnRH at the onset of estrus can control time of ovulation but, at the dose employed, sows receiving GnRH may develop ovarian cysts.

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“…Recently, it has become normal to advance puberty in commercial gilts by hormonal stimulation. However, most of the studies that have been done in the past revealed that stimulation of puberty is fraught with difficulties [2]. Particularly, gilts treated with exogenous gonadotropins show wide variability in pubertal response, fail to exhibit signs of estrus, often fail to undergo a normal estrous cycle following the induced estrus, and exhibit poor subsequent reproductive performance [3,4], such as small litter size when inseminated in the first synchronized estrus [5].…”

mentioning

confidence: 99%

Influence of Estrus Synchronization of Prepubertal Gilts on Embryo Quality

Ziȩcik

Biallowicz

Kaczmarek

et al. 2005

Journal of Reproduction and Development

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Abstract. Synchronization and superovulation are commonly used to obtain large numbers of embryos for experimental and practical purposes. This study compared the number, quality, and in vitro development of embryos recovered from gilts following single or double estrus synchronization and superovulation. Prepubertal gilts from the single synchronization group were injected with 1500 I.U. PMSG and 1000 I.U. hCG 72 h later. The double synchronized group of gilts was treated with 750 I.U. PMSG and 500 I.U. hCG 72 h later. After 17 days, 1500 I.U. PMSG followed by 1000 I.U. hCG was administered. Five days after insemination embryos were recovered and cultured for 6 days. Both single and double hormonal stimulation schedules resulted in recovery of elevated numbers of embryos (28.4 and 23.4 vs. 11.3; p<0.01and p≤0.05, respectively) with a higher percentage of embryos classified as degenerated (39.2% and 43.1%, respectively) compared to the non-stimulated, control group (5.1%). The number of embryos destined for culture did not differ between the single and double synchronized groups. The highest percentage of hatched embryos was observed in the control group. In conclusion, the single synchronization and superovulation schedule is sufficient to obtain high numbers of embryos, however, both synchronization methods resulted in the recovery of considerable numbers of degenerated embryos. A higher number and percentage of hatched embryos after culture was found among embryos from the control group compared to gonadotropinstimulated gilts.

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Control of oestrus in gilts II. Synchronization of oestrus with a progestagen, altrenogest (Regumate): Effect on fertility and litter size

Cited by 31 publications

References 1 publication

Study on the Oestrous Synchronization in Gilts by Using Progestin Altrenogest and hCG: Its Effect on the Follicular Development, Ovulation Time and Subsequent Reproductive Performance

Study on the Oestrous Synchronization in Gilts by Using Progestin Altrenogest and hCG: Its Effect on the Follicular Development, Ovulation Time and Subsequent Reproductive Performance

Effect of the administration of GnRH or hCG on time of ovulation and the onset of estrus-to-ovulation interval in sows in Thailand

Influence of Estrus Synchronization of Prepubertal Gilts on Embryo Quality

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