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https://hdl.handle.net/2440/79966
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Type: | Journal article |
Title: | Boar contact is an effective stimulant of ovulation during early lactation |
Author: | Van Wettere, W. Kaisler-Smith, C. Terry, R. Weaver, A. Herde, P. Kennaway, D. Hughes, P. Kind, K. |
Citation: | Livestock Science, 2013; 155(2):454-458 |
Publisher: | Elsevier Science BV |
Issue Date: | 2013 |
ISSN: | 1871-1413 1878-0490 |
Statement of Responsibility: | W.H.E.J. van Wettere, C.R. Kaisler-Smith, R. Terry, A.C. Weaver, P.J. Herde, D.J. Kennaway, P.E. Hughes, K.L. Kind |
Abstract: | The efficacy of 400IU equine chorionic gonadotrophin (eCG) and 200IU human chorionic gonadotrophin (hCG) (PG600; Intervet, Australia) and boar exposure as stimuli of oestrus and ovulation have been established in pre-pubertal gilts and weaned sows, but there is little published data on their use to overcome lactation anoestrus. Designed as a 2×2 factorial, the current study used 40 Large White/Landrace sows (parity 1.9±0.14), to determine the effects of boar exposure (BE) versus NoBE and PG600 versus NoPG600 on the incidence of lactation oestrus and ovulation. On day 1 of lactation, PG600 was administered and BE commenced. Throughout lactation all sows were housed individually in farrowing crates (0.6×2.4m2). BE consisted of 15min of daily, full physical boar exposure in a detection mating area. For all sows, litter size suckled was standardized to 10 piglets on day 1 of lactation, and maintained at this level until weaning on day 26 post-partum. Oestrus detection was performed daily, with oestrus defined as the exhibition of a standing reflex, and ovulation confirmed when progesterone concentrations exceeded 1.0ng/ml on day 3 and 4.0ng/ml on day 10 post-oestrus detection. There was no effect of PG600 on any reproductive measures, and no interactions with the BE treatment. A higher proportion of BE compared to non-BE sows exhibited a behavioural oestrus without ovulation within 5 days of parturition (0.83 versus 0.09; P<0.05). The interval from parturition to lactation ovulation was unaffected by treatment (15.4±1.21 days). However, BE increased the proportion of sows ovulating during lactation (0.61 versus 0.09; P<0.05), and resulted in an earlier ovulation relative to parturition (20.6±1.30 versus 30.1±1.35 days) compared to non-BE sows. In conclusion, this is the first study to demonstrate that taking lactating sows to a detection mating area for 15min of daily, physical boar contact resulted in a high incidence of lactation ovulation within 22 days of parturition. © 2013. |
Keywords: | Boar contact Gonadotrophins Lactation oestrus Pig Sow |
Rights: | Copyright © 2013 |
DOI: | 10.1016/j.livsci.2013.04.017 |
Published version: | http://dx.doi.org/10.1016/j.livsci.2013.04.017 |
Appears in Collections: | Animal and Veterinary Sciences publications Aurora harvest |
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