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 417168
Title Split-weaning Before Altrenogest Synchronization of Multiparous Sows Alters Follicular Development and Reduces Embryo Survival
Author(s) Leeuwen, J.J.J. van; Verhoeven, M.; Heden-van Noort, I. van; Kranenbarg, S.; Kemp, B.; Soede, N.M.
Source Reproduction in Domestic Animals 47 (2012)4. - ISSN 0936-6768 - p. 530 - 536.
DOI http://dx.doi.org/10.1111/j.1439-0531.2011.01913.x
Department(s) Adaptation Physiology
Experimental Zoology
WIAS
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) primiparous sows - progestagen treatment - luteinizing-hormone - bovine oocytes - ovulation rate - litter size - estrus - follicles - gilts - pregnancy
Abstract This study used split-weaning (SW) to induce differences in follicle size at weaning and study its consequences for follicle development during and after post-weaning altrenogest feeding and for reproductive performance. Multiparous sows (n = 47) were assigned to SW (n = 23; litter size reduced to the six smallest piglets 3 days before weaning) or control (C; n = 24; normal weaning). Altrenogest (20 mg/day) was fed to all 47 sows from Day -1 till Day 5 (complete weaning = Day 0). Follicle size on Day 1, 2 and 8 was smaller in C than in SW (p = 0.05). Ovulation rate was similar, but C sows had higher embryo survival rate (ESR) than SW sows (83 ± 19 and 58 ± 31%, respectively; p = 0.001). SW sows with low ESR (63%; n = 10; p = 0.04). A decrease in follicle size between Day 5 and 6 of altrenogest feeding was associated with increased ESR in both treatments (p = 0.002). Follicle pool analyses (assessment of all follicles >2 mm) revealed that on Day 3, sows with low ESR had a higher % of follicles >5 mm compared with sows with high ESR (30% vs 10%; p = 0.04). Thus, sows in which follicle growth was less suppressed during altrenogest feeding had a lower ESR. These effects on follicle development and ESR were more pronounced in split-weaned sows.
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