The effects of season and moderate nutritional restriction on ovarian function and oocyte nuclear maturation in cycling gilts

Swinbourne, Alyce M.; Kelly, Jennifer; Kind, Karen L.; Kennaway, David J.; Wettere, W. H. E. J. van

doi:10.1016/j.theriogenology.2014.08.016

Cited by 5 publications

(1 citation statement)

References 37 publications

(57 reference statements)

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“…In addition, many studies have also shown that seasons have important effects on the reproductive performance of sows. Normal reproducing sows give birth to more piglets in total and at weaning during the spring and fall than during the summer and winter, indicating that seasonal effects have a significant impact on the litter size of sows in normal reproduction (Hagan & Etim, 2019; Swinbourne et al, 2014; Tantasuparuk et al, 2000). In fact, a previous research has confirmed that seasons have a considerable impact on the efficiency of somatic cell cloning in pigs (Huang et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Influence of season and conditions of surrogate sows on efficiency of somatic cell cloning production

Huang

Zhou

et al. 2023

Reprod Domestic Animals

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This study was focused on the effects of ovary acquisition season, embryo transfer season, and conditions of surrogate sows on cloning efficiency, with the objective of improving the production of cloned pigs. The statistical analysis documented that cloning efficiency was highest when ovary extraction and embryo transfer occurred in the spring, and lowest when such operations occurred in the autumn. This was evidenced by the higher number of recovered oocytes (3.2 ± 0.47 vs. 2.5 ± 0.51), rate of mature oocytes (57.4 ± 0.07% vs. 48.9 ± 0.06%), rate of developed cloned blastocysts (35.7 ± 0.12% vs. 34.4 ± 0.07%), pregnancy rate of surrogate sows (73.5% vs. 33.3%), delivery rate (67.6% vs. 16.7%), litter size (6.9 ± 2.3 vs. 2.3 ± 2.5), and the number of alive newborns (5.7 ± 2.2 vs. 1.3 ± 1.2). Cloning efficiency was little affected by the ovulatory status of the surrogate sow prior to embryo transfer. The length of pregnancy, the parity, and the length of labor of the surrogate sow significantly affected the efficiency of generating pigs cloned from somatic cells. Specifically, when length of pregnancy ranged from 111 to 117 days, surrogate sows with shorter gestation period had larger litter size (8.9 ± 2.8) and a higher number of stillbirths per litter (2.1 ± 2.0). Moreover, statistical analysis indicated that selecting sows with 2–4 parities as surrogates led to increased litter size (7.7 ± 3.0) and the number of alive newborns (6.4 ± 3.1). In comparison with naturally breeding sows, the surrogate sows spent more time giving birth and suffered higher rates of stillbirth. The data obtained in this study provide valuable insights for improving the production efficiency of somatic cell cloned pigs.

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Section: Introductionmentioning

confidence: 99%

Influence of season and conditions of surrogate sows on efficiency of somatic cell cloning production

Huang

Zhou

et al. 2023

Reprod Domestic Animals

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Effect of short-term nutritional supplementation on hormone concentrations in ovarian follicular fluid and steroid regulating gene mRNA abundances in granulosa cells of ewes

Guo

Duan

Hao

et al. 2019

Animal Reproduction Science

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Seasonal infertility in pigs: what have we achieved and where are we up to?

King¹

2017

Anim. Prod. Sci.

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The most common manifestations of seasonal infertility are delayed puberty, prolonged weaning to oestrus intervals and a reduced farrowing rate brought about by increased returns to oestrus, including a proportionally higher incidence of irregular returns to oestrus. Over the past 40 years, there has been considerable investment in Australian pig research that has generated extensive knowledge about the physiological mechanisms behind seasonal infertility. While some of the physiological mechanisms allowing the expression of seasonal infertility still remain unclear, a number of possible intervention strategies have been developed and investigated to ameliorate the effects of seasonal infertility in commercial production. For commercial pork producers, there is considerable information available that is based on both research and practical experience, which the farmers can use to identify strategies to minimise the impact of seasonal infertility on the farm. The industry still provides some support to research and development efforts to address seasonal infertility, although, in the future, it may be more targeted to identifying interventions to ameliorate the impact of seasonal infertility in affected herds, rather than undertaking intensive studies into the possible mechanisms and reasons behind this very complex syndrome.

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The effects of season and moderate nutritional restriction on ovarian function and oocyte nuclear maturation in cycling gilts

Cited by 5 publications

References 37 publications

Influence of season and conditions of surrogate sows on efficiency of somatic cell cloning production

Influence of season and conditions of surrogate sows on efficiency of somatic cell cloning production

Effect of short-term nutritional supplementation on hormone concentrations in ovarian follicular fluid and steroid regulating gene mRNA abundances in granulosa cells of ewes

Seasonal infertility in pigs: what have we achieved and where are we up to?

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