Staff Publications

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 405293
Title The effect of different postweaning altrenogest treatments of primiparous sows on follicular development, pregnancy rates, and litter sizes
Author(s) Leeuwen, J.J.J. van; Williams, S.I.; Martens, M.R.T.M.; Jourquin, J.; Draincourt, M.A.; Kemp, B.; Soede, N.M.
Source Journal of Animal Science 89 (2011)2. - ISSN 0021-8812 - p. 397 - 403.
Department(s) Adaptation Physiology
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) feed-intake - reproductive-performance - progestagen treatment - different patterns - lactating sows - ovulation rate - estrous-cycle - gilts - fertility - piglet
Abstract This study investigated follicular development during and after postweaning altrenogest treatment of primiparous sows in relation to subsequent reproductive performance. Primiparous sows (n = 259) were randomly assigned at weaning (d 0) to 1 of 4 groups: control (no altrenogest, n = 71), RU4 (20 mg of altrenogest from d –1 to 2, n = 62), RU8 (20 mg of altrenogest from d –1 to 6, n = 65), or RU15 (20 mg of altrenogest from d –1 to 13, n = 61). Average follicular size (measured by ultrasound) increased during altrenogest treatment and resulted in larger follicles at the start of the follicular phase for RU4, RU8, and RU15 compared with controls (5.3 ± 0.9, 5.5 ± 1.3, 5.1 ± 1.2, and 3.4 ± 0.6 mm, respectively; P <0.0001). Farrowing rate was greater in RU15 (95%) than in RU8 (76%; P = 0.04). The RU15 group also had more piglets (2 to 3 more piglets total born and born alive; P <0.05) than the other treatment groups. Follicular development at weaning clearly affected reproductive performance. At weaning, average follicular size: small (
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