Uterine involution time and ovarian activity in weaned and suckling ewes

Rubianes, E.; Ungerfeld, Rodolfo; Viñoles, C.; Carbajal, B.; Castro, T. de; Ibarra, D.

doi:10.4141/cjas96-022

Cited by 19 publications

(26 citation statements)

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“…The interval from parturition to first progesterone increase phase in untreated ewes (CE-E1 ewes) was similar to our previous observations (Rubianes et al, 1996), and is within the range reported in other breeds (Mandiki et al, 1990;Wright et al, 1990). However, that value corresponds to a small percentage of ewes, as 24.4% of them did not have luteal progesterone concentrations during the observed period (65 days).…”

Section: Resultssupporting

confidence: 59%

“…Uterine involution is completed by the third week (Rubianes & Ungerfeld, 1993) and the first oestrus is observed ~50 days after parturition (Rubianes et al, 1996) when ewes are maintained in a high nutritional plane. Therefore, as not all ewes are cyclic during early postpartum, for accelerated lambing programmes, oestrus induction managements should be included.…”

Section: Introductionmentioning

confidence: 99%

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Oestrus synchronization in postpartum autumn-lambing ewes: effect of postpartum time, parity, and early weaning

Ungerfeld

Sánchez-Dávila²

2012

Span. j. agric. res.

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Three experiments were performed to determine the effect of postpartum time interval, the influence of parity (primimarous vs multiparous), and lamb weaning on the response of postpartum ewes to oestrus synchronization/induction treatments during the breeding season. In the Experiment 1 ewes were treated with an 8-days medroxyprogesterone priming and 350 IU of eCG, starting 14-18 (EPP), 24-30 (MPP), or 42-48 (LPP) days postpartum. More EPP than LPP ewes were marked by rams (p < 0.05), but conception rate was similar. In Experiment 2, 36 primiparous and 47 multiparous ewes that lambed during autumn received a 12-days medroxyprogesterone treatment followed by the introduction of rams. Ewes that came into oestrus, and that had a corpus luteum on Day 5 was greater in multiparous than in primiparous ewes (p = 0.04 and p = 0.03 respectively). Pregnancy rates on Day 35 and on Day 90 were similar. Experiment 3 was conducted with 26 ewes that remained with their lambs suckling during all the experiment, and 26 that were weaned ~27 days after birth, 3 days before the introduction of the rams. There were no differences on the percentage of ewes that came into oestrus, or the conception rate. We concluded that in postpartum ewes that had lambed during the breeding season: (1) is possible to induce fertile oestrus during early postpartum; (2) the early response was greater in multiparous rather than in primiparous ewes, although after a 35 d-breeding period differences disappeared and (3) weaning lambs early before stimulation did not improve the response.Additional key words: intensive breeding; lactation; postpartum anoestrous; progestagen; sheep. ResumenSincronización de celos en ovejas posparto que paren en otoño: efecto del intervalo posparto, la paridad y el destete temprano Se realizaron 3 experimentos para determinar el efecto del tiempo posparto, de la paridad (primíparas-multíparas) y el destete sobre la respuesta de ovejas posparto a una sincronización/induccción de celos durante la estación reproductiva. En el Experimento 1 se trató a las ovejas con medroxiprogesterona durante 8 días y eCG (350 IU), a los 14-18 (EPP), 24-30 (MPP), o 42-48 (LPP) días posparto. Más ovejas EPP que LPP (p < 0,05) manifestaron celo, siendo la tasa de concepción similar. En el Experimento 2 se utilizaron 36 ovejas primíparas y 47 multíparas que parieron durante otoño, y recibieron un tratamiento con medroxiprogesterona seguido de la introducción de carneros. El porcentaje de ovejas en celo, y ovejas que ovularon a los 5 días fue mayor en las multíparas que en las primíparas (p = 0,04 y p = 0,03 respectivamente); la tasa de preñez fue similar. En el Experimento 3 se utilizaron 26 ovejas que permanecieron con sus corderos lactando durante todo el experimento, y 26 que fueron destetados a ~27 días posparto, 3 días antes de la introducción de los carneros. No hubo diferencias en los porcentajes de ovejas en celo, ni en la tasa de concepción. Se concluyó que en ovejas postparto que parieron durante la estación reproductiva: (1) fue ...

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Section: Resultssupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Oestrus synchronization in postpartum autumn-lambing ewes: effect of postpartum time, parity, and early weaning

Ungerfeld

Sánchez-Dávila²

2012

Span. j. agric. res.

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“…Complete uterine involution is a prerequisite to the maintenance of pregnancy. The time estimated for the completion of uterine involution in sheep varies between 17 and 40 days (Ungerfeld and Sanchez-Davila, 2012;Rubianes et al, 1996;Hauser and Bostedt, 2002). In goat, completion of uterine involution and resumption of sexual activity following parturition depend on several factors, such as nutrition, parity, breed, nursing of offspring and season of parturition (Badawi et al, 2014;Delgadillo et al, 1998 Greyling, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…In most studies, uterine involution was investigated after slaughter (Van Wyk et al, 1972;Rubianes and Ungerfeld, 1993) or by laparotomy (Rubianes et al, 1996) or using radio-opaque markers (Tian and Noakes, 1991).…”

Section: Introductionmentioning

confidence: 99%

Ultrasonographic assessment of uterine involution and ovarian activity in West Africa Sahelian goats

Zongo¹,

Mohammed²,

Hanzen³

et al. 2015

J. Vet. Med. Anim. Health

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This study aimed to characterize uterine involution and early ovarian postpartum activity in Sahelian goats. A total of 21 goats were allowed to nurse their kids and were examined every other day for complete uterine involution or daily for follicular development using a 5 MHz transrectal linear transducer. The obtained results indicated three phases of uterine regression, a fast involution phase (rates of 0.71 cm/day), a second moderate involution phase (0.17 cm/day), and a low rate of 0.14 cm/day that ended by day 22.44 ± 1.54. During the experiment, two goats showed an abnormal uterine involution and were excluded from the general profile. The 19 other goats exhibited a very similar profile of uterine involution described by the logarithmic equation y = -2.33ln(x) + 9.43 (R 2 = 0.98, P < 0.05) where y = uterine diameter (cm) and x = days postpartum. Ovarian activity started within the first week postpartum and was characterized by appearance of one to three follicles ranged in mean size [4.95 ± 1.45 to 8.56 ± 0.66] on both ovaries. These findings could assist practitioners to decide when goats should be bred following parturition.

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“…A normal luteal phase was defined as the presence of progesterone concentrations above 0.5 ng mL -1 for at least 10 d (Rubianes et al 1996). An LH surge was defined as being at least six times higher than basal concentrations.…”

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confidence: 99%

Ovarian responses of anestrous ewes to the "ram effect"

Ungerfeld¹,

Pinczak²,

Forsberg³

et al. 2002

Can. J. Anim. Sci.

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Ungerfeld, R., Pinczak, A., Forsberg, M. and Rubianes, E. 2002. Ovarian responses of anestrous ewes to the "ram effect". Can. J. Anim. Sci. 82: 599-602. Ovarian responses to the "ram effect" were characterized in 11 anestrous Corriedale ewes. In seven ewes, there was a luteinizing hormone (LH) surge 36.7 ± 12.3 h (mean ± SEM) after ram introduction and a concurrent increase (P < 0.05) in serum follicle stimulating hormone (FSH). Ovarian responses (monitored ultrasonographically) were highly variable. One ewe had two luteal phases (short and normal, respectively), three had delayed ovulation (days 5-7), two had luteinization of non-ovulatory follicles, one developed a luteinized follicular cyst, and four had no luteal phase. Key words:Ram effect, ovarian follicular dynamics, seasonal anestrus, ultrasonography, gonadotropin Ungerfeld, R., Pinczak, A., Forsberg, M. et Rubianes, E. 2002. Réaction ovarienne des brebis non en chaleur à un bélier. Can. J. Anim. Sci. 82: 599-602. Onze brebis Corriedale non en chaleur ont servi à déterminer la réaction ovarienne à la présence du mâle. Sept sujets présentaient une élévation de la concentration de LH 36,7 ± 2.3 h (moyenne ± E.-T.) après introduction du béli-er, parallèlement à hausse (P < 0,05) de la concentration de FSH dans le sang. La réaction des ovaires (contrôlée par échographie) varie considérablement. Une brebis a connu deux phases lutéales (une brève et une normale, respectivement); trois ont affiché un retard d'ovulation (de 5 à 7 jours); dans deux cas, les follicules non ovulatoires s'étaient transformés en corps jaune; un animal a développé un kyste folliculaire lutéinisé et quatre n'ont passé par aucune phase lutéale.Mots clés : réaction au mâle, dynamique des follicules ovariens, anoestrus saisonnier, échographie, gonadotrophineThe response of isolated anestrous ewes to the introduction of rams (the "ram effect") has been known for many years. This response is characterized by an increase in luteinizing hormone (LH) pulse frequency and a decrease in the negative feedback of estradiol-17β on the hypothalamic-pituitary axis (Martin et al. 1986), culminating in an LH surge (approximately 30 h after ram introduction) that is followed by a "silent" ovulation (not associated with estrous behaviour). The resulting corpus luteum (CL) has either a normal or a short life span. Most ewes with a normal life span CL following their first ovulation display estrus prior to their second ovulation, whereas most of those with a short lifespan CL have a silent second ovulation and display estrus (for the first time) prior to their third ovulation. Consequently, a bimodal distribution of the estrus is observed, with two peaks concentrated 17-20 and 21-25 d, respectively, after ram introduction (Martin et al. 1986).Transrectal ultrasonography has been used to monitor ovarian follicular development in ewes. During seasonal anestrous, the interval between successive waves of follicular development was approximately 5 d (Bartlewski et al. 1998), similar to that during the estrous c...

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Uterine involution time and ovarian activity in weaned and suckling ewes

Cited by 19 publications

References 5 publications

Oestrus synchronization in postpartum autumn-lambing ewes: effect of postpartum time, parity, and early weaning

Oestrus synchronization in postpartum autumn-lambing ewes: effect of postpartum time, parity, and early weaning

Ultrasonographic assessment of uterine involution and ovarian activity in West Africa Sahelian goats

Ovarian responses of anestrous ewes to the "ram effect"

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