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 352372
Title Influence of repeated regrouping on reproduction in gilts
Author(s) Soede, N.M.; Sleuwen, M.J.W. van; Molenaar, R.; Rietveld, F.W.; Schouten, W.G.P.; Hazeleger, W.; Kemp, B.
Source Animal Reproduction Science 96 (2006)1-2. - ISSN 0378-4320 - p. 133 - 145.
Department(s) Adaptation Physiology
Agrotechnology and Food Sciences
AFSG Agrisystems & Environment
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) repeated acute elevation - female pigs - hormonal profiles - salivary cortisol - sexual-behavior - early-pregnancy - induced stress - sows - estrus - ovulation
Abstract It is generally assumed that stress around oestrus and during early pregnancy reduces reproductive performance of pigs. In our experiment, late prepuberal gilts (age at arrival 225 ± 6 days) were housed in groups of four. Stress treatment consisted of once weekly regrouping and twice weekly feed competition of the 28 Stress gilts during 6 consecutive weeks, starting 13 days after arrival. Control gilts (n = 28) were not treated. During the 0.5¿1.5 h after regroupings, Stress animals fought consistently more than the Control animals; up to 13 of the Stress animals fought for at most 60% of the time compared to one Control animal fighting for at most 3.3% of the time. The day before first regrouping, gilts had on average 4.0 ± 0.9 skin scratches. By week 6, this number had reduced to 2.1 ± 1.0 in Control, but remained 4.0 ± 1.3 in Stress gilts (P <0.05). In the afternoon after regroupings, skin scratches increased up to 6.3 ± 1.6 in the Stress gilts. Saliva cortisol in the afternoon before regrouping did not differ between weeks 1, 3 and 6, nor did it differ between Stress and Control. In Stress gilts, saliva cortisol was increased in the afternoon of first regrouping, in Batch 2 only (from 1.8 ± 0.4 to 4.1 ± 0.9 ng/ml; P <0.05). Animals showing a second oestrus within 5 weeks after arrival were inseminated. Duration of second oestrus of these animals was 2.48 ± 0.66 days in the Stress gilts (n = 24) and 2.21 ± 0.58 days in the Control gilts (n = 22; P > 0.10). At Day 35 after insemination, pregnancy rate was 100% in both groups. Ovulation rate and number of total and vital fetuses was similar (P > 0.10). The Stress treatment during a 6-week period around insemination consistently resulted in fighting but did not result in long term effects on cortisol levels and did not impair reproductive performance
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