Follicular size, luteinizing hormone (LH), and progesterone (P4) levels in postpartum Santa Inês ewes subjected to ram effect combined with suckling interruption

Ferreira-Silva, José Carlos; Filho, Fernando Tenório; Moura, Marcelo Tigre; Nascimento, Pábola Santos; Oliveira, Luís Rennan Sampaio; Bartolomeu, Cláudio Coutinho; Oliveira, Marcos Antônio Lemos

doi:10.1016/j.livsci.2018.05.016

Cited by 8 publications

(6 citation statements)

References 25 publications

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“…Some management tools can also increment reproductive efficiency. For example, the exposure of the male to the female with temporary weaning for 24 h improved the reproductive performance in ewes under postpartum anestrous ( 54 ). Also, the male effect promotes pre-ovulatory LH peaks up to 80 h after physical contact ( 55 ).…”

Section: Discussionmentioning

confidence: 99%

Technologies Used in Production Systems for Santa Inês Sheep: A Systematic Review

2022

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This study identifies the number of publications that presented technologies used in the production systems of Santa Inês sheep in the last 5 years (2017–2021) carried out in Brazil. Therefore, the objective was to identify where we are in terms of knowledge about technologies in different fields (health, reproduction, animal breeding, behavior and welfare, nutrition and feeding, forage and pasture, carcass and meat quality, and economics and management of livestock systems). After rigorous selection, 114 studies were appointed and classified by knowledge field, and the main approaches within each theme were evaluated, pointing out research gaps. Most technologies have been in northeastern states. However, government agencies should develop public policies to disseminate techniques in rural areas because the production system in this region is still subsistence. This study highlighted the need for works that present management practices and tools that impact the improvement of animal welfare. Agro-industrial by-products have been widely used as an alternative for sheep feeding. However, economic feasibility analyses are recommended with these foodstuffs to substantiate their use as an option to reduce production costs. There is a lack of research allusive to the management of production systems, especially those related to estimates of economic feasibility indicators.

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Section: Discussionmentioning

confidence: 99%

Technologies Used in Production Systems for Santa Inês Sheep: A Systematic Review

2022

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“…Similar results were obtained by Atkinson and Williamson (1985) and Rubianes et al (1997) who observed that, the diameter and number of the larger follicles increased subjected to the presence of the rams with ewes. Moreover, it leads to larger ovulatory follicle size (Ferreira-Silva et al, 2018). It could be deduced that, follicles number and size were higher of ewes in REG compared with the ewes in CG may be due to the presence of the rams.…”

Section: Follicular Dynamicsmentioning

confidence: 92%

“…After ram introduction, follicular growth and development begins immediately, this may be due to the response to the initial in the LH basal levels and pulse frequency (Atkinson and Williamson, 1985). However, the presence of ram with ewes until the ovulation leads to peaks of preovulatory LH in ewes, that acts upon this role of the growth and development of the ovarian follicles (Okamura et al, 2010;Hawken and Martin, 2012;Ferreira-Silva et al, 2017 ab andFerreira-Silva et al, 2018). Table (2) that, the lambing rate was higher (P <0.01) in the REG compared to the CG (97.14 vs 81.43 %).…”

Section: Follicular Dynamicsmentioning

confidence: 99%

Ovarian Activity and Reproductive Performance of Mature Ossimi Ewes as Affected by Presence of Ram

Mahmoud

Hussein

2019

Egyptian Journal of Animal Production

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Two experiments were conducted in this study to assess the role of ram effect prior to mating on ovarian follicular dynamics and reproductive performance of Ossimi ewes. In Expt. 1, fourteen Ossimi ewes 3-6 years old were used. The first group (n=7), ewes were exposed with two trained teaser rams (REG), whilst, the second group (n=7) remaining ewes were isolated of rams (CG). The number and size of all follicles ≥2 mm and corpus luteum were monitored by ultrasonography. Expt. 2, including two mating season, 70 Ossimi ewes (3-6 years old) were selected from 115 ewes in each mating season, multiparous, non-lactating and clinically healthy. The first mating season (n=70), ewes were kept in the presence with teaser rams (REG) during the estrus detection and mating for two consecutive estrous cycles (45 d). The second mating season (n=70), ewes were remaining isolated of rams (CG) except at the time for detection of estrus. Ewes were mated after detection of estrus. While, ewes return to estrus, were mated again. At lambing, birth dates and the lambs born number per each ewe were recorded. All ewes isolated of males for three months before the beginning of the experiments. There were significant (P < 0.01) increases in the small (2-2.9 mm) and medium (3-5 mm) follicles number on ovaries of ewes in REG compared to CG. Moreover, the size of maximum ovulatory follicles and subdominant follicles (next largest follicle) were larger (P <0.001) in ewes of REG compared with those of CG. In addition, the ovulation rate mean was higher (P =0.05) in the REG than that of the CG (Expt. 1). The lambing rate was higher (P <0.01) in the first mating season (REG) compared to the ewes in the second mating season (CG). At the same time, the mean number of fecundity and litter size were higher (P <0.01) in the REG compared to the CG. Moreover, twining lambing rate was higher (P <0.01) in the REG. by contrary, the percentage of single lambing was lower (P <0.01) in the first mating season (REG). The percentage of ewes lambing at first service was higher in the REG than in CG but the difference was insignificant (Expt. 2). In conclusion, these results show that, ram introduction prior to mating season increased the ovarian activity and reproductive performance after period of isolation of Ossimi ewes.

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“…Considering that lactation inhibits the functionality of the reproductive axis (Morales-Terán et al, 2004), temporary or permanent weaning can enhance the response to estrous induction in ewes (Ronquillo et al, 2008;Ferreira-Silva et al, 2018). Other authors, however, did not observe any reproductive advantage of weaning lambs (Ungerfeld & Sánchez-Dávila, 2012;Goff et al, 2014;Orihuela et al, 2016), which is probably related to the strength of the seasonal inhibition of the reproductive axis according to the breed and/or other metabolic and environmental constraints.…”

Section: Introductionmentioning

confidence: 99%

Does litter size affect the response of postpartum nursing ewes to hormonal estrous induction during spring?

Bottino

Pérez-Clariget

Ungerfeld

2022

Preprint

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The objective of this study was to determine if the litter size of nursing ewes affects the response to hormonal treatments to induce estrus and ovulation during the non-breeding season. For this, 124 Corriedale ewes were used, 56 ewes that had lambed during spring and remaining nursing a single lamb (GS, n = 30) or twin lambs (GT, n = 26). Another group of ewes that did not lamb was included as a control group (GC, n = 68). Estrus was induced 38 days after lambing with intravaginal sponges impregned with medroxyprogesterone acetate, that remained 7 days in situ, plus the administration of 350 IU of eCG at withdrawal. Once detected in estrus, the ewes were cervically inseminated, and 8 and 40 days later the presence of corpus luteum (CL) and pregnancy was determined by transrectal ultrasonography respectively. The percentage of ewes that came into estrus did not differ between groups. More GC than GT ewes had CL (P = 0.02), with GS not differing from the other groups. The conception and pregnancy rates were greater in GC than in GS and GT ewes (P ≤ 0.03). The litter size had no effect on the response to estrous induction; however, nursing impaired the pregnancy outcome, probably due to the failure in the ovulatory process or the early regression of the CL.

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Follicular size, luteinizing hormone (LH), and progesterone (P4) levels in postpartum Santa Inês ewes subjected to ram effect combined with suckling interruption

Cited by 8 publications

References 25 publications

Technologies Used in Production Systems for Santa Inês Sheep: A Systematic Review

Technologies Used in Production Systems for Santa Inês Sheep: A Systematic Review

Ovarian Activity and Reproductive Performance of Mature Ossimi Ewes as Affected by Presence of Ram

Does litter size affect the response of postpartum nursing ewes to hormonal estrous induction during spring?

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