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Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 405300
Title Reproductive cycles in pigs
Author(s) Soede, N.M.; Langendijk, P.; Kemp, B.
Source Animal Reproduction Science 124 (2011)3-4. - ISSN 0378-4320 - p. 251 - 258.
DOI https://doi.org/10.1016/j.anireprosci.2011.02.025
Department(s) Adaptation Physiology
WIAS
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) growth-factor-i - porcine corpora-lutea - dietary energy-source - 2 feeding levels - luteinizing-hormone - primiparous sows - follicular development - estrous-cycle - ovulation rate - pulsatile release
Abstract The oestrous cycle in pigs spans a period of 18–24 days. It consists of a follicular phase of 5–7 days and a luteal phase of 13–15 days. During the follicular phase, small antral follicles develop into large, pre-ovulatory follicles. Being a polytocous species, the pig may ovulate from 15 to 30 follicles, depending on age, nutritional status and other factors. During the luteal phase, follicle development is less pronounced, although there is probably a considerable turnover of primordial to early antral follicles that fail to further develop due to progesterone inhibition of gonadotrophic hormones. Nevertheless, formation of the early antral follicle pool during this stage probably has a major impact on follicle dynamics in the follicular phase in terms of number and quality of follicles. Generally, gilts are mated at their second or third estrous cycle after puberty. After farrowing, pigs experience a lactational anoestrus period, until they are weaned and the follicular phase is initiated, resulting in oestrus and ovulation 4–7 days after weaning. This paper describes the major endocrine processes during the follicular and luteal phases that precede and follow ovulation. The role of nutrition and metabolic status on these processes are briefly discussed
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