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The effect of ACTH during oestrus on the reproduction in the sow

with special reference to duration of oestrus, ovulation, hormonal patterns, gametes and early embryo development

Brandt, Ylva (2006). The effect of ACTH during oestrus on the reproduction in the sow. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2006:14
ISBN 91-576-7063-3
[Doctoral thesis]

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Abstract

Regrouping of weaned sows gives rise to stressful situations during the critical time when the sows must resume oestrous activity after lactation. The aim of these studies was to simulate the social stress seen after regrouping through repeated injections of synthetic ACTH during oestrus in the sow. The period of treatment lasted for about 48 h from the onset of standing oestrus. The following reproductive events were studied and compared between the ACTH-treated sows (ACTH group) and the control sows (C group): duration of standing oestrus, time of ovulation, hormonal patterns, the number of spermatozoa and their morphology as well as the intraluminal environment of the uterine tubal junction (UTJ) and of isthmus shortly after ovulation, oocyte/embryo transport in the oviduct, and embryo development at 48 or 60 h after ovulation. The sows in the ACTH group stopped displaying signs of standing oestrus sooner after ovulation than the C group, but no effect was found on the time of ovulation. Cortisol and progesterone concentrations were elevated significantly in jugular blood samples taken after the ACTH injections. There were minor differences in oestradiol and LH concentrations between the groups. Overall, inhibin α concentrations were significantly higher during the treatment period in the ACTH group than in the C group. There was a tendency towards a larger number of spermatozoa in the UTJ and oviduct among the sows in the ACTH group. A majority of sows in the ACTH group had moderately to exaggerated amounts of mucus in the intraluminal environment of the sperm reservoir. The ACTH injections had no effect on embryo development. However, fewer oocytes/embryos were retrieved from the ACTH group than from the C group and there was a tendency towards faster embryo transportation to the uterus. In conclusion, simulated stress caused significant loss of oocytes and embryos, shortened the duration of standing oestrus and changed the hormonal pattern of progesterone, and possibly of inhibin α, oestradiol and LH. There were also tendencies towards an altered intraluminal environment in the oviduct and UTJ and augmented transportation of spermatozoa and embryos through the female genital tract in the ACTH-treated sows.

Authors/Creators:Brandt, Ylva
Title:The effect of ACTH during oestrus on the reproduction in the sow
Subtitle:with special reference to duration of oestrus, ovulation, hormonal patterns, gametes and early embryo development
Year of publishing :April 2006
Volume:2006:14
Number of Pages:55
Papers/manuscripts:
NumberReferences
ALL I. Brandt, Y., Lang, A., Madej, A., Rodríguez-Martínez, H. & Einarsson, S. 2006. Impact of ACTH administration on the oviductal sperm reservoir in sows: The local endocrine environment and distribution of spermatozoa. Animal Reproduction Science 92, 107–122. II. Brandt, Y., Lang, A., Madej, A., Rodríguez-Martínez, H. & Einarsson, S. 2006. Impact of ACTH during oestrus on the ultrastructure of the spermatozoa and their environment in the tubal reservoir of the postovulatory sow. Animal Reproduction Science, in press (e-published ahead of print 2005). III. Brandt, Y., Lundeheim, N., Madej, A., Rodríguez-Martínez, H. & Einarsson, S. 2006. Effects of ACTH injections during estrus on concentrations and patterns of progesterone, estradiol, LH, and inhibin α and time of ovulation in the sow. Accepted for publication in Domestic Animal Endocrinology. IV. Brandt, Y., Madej, A., Rodríguez-Martínez, H. & Einarsson, S. 2006. Effects of exogenous ACTH during oestrus on early embryo development and oviductal transport in the sow. Accepted for publication in Reproduction in Domestic Animals.
Place of Publication:Uppsala
ISBN for printed version:91-576-7063-3
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:sows, wild boar, corticotropin, stress, oestrous cycle, ovulation, endocrinology, hormones, gametes, reproduction, embryonic development
Keywords:Pig, Sus Scrofa, ACTH, stress, oestrus, ovulation, endocrinology, sperm transport, embryo transport, embryo development.
URN:NBN:urn:nbn:se:slu:epsilon-1004
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-1004
ID Code:1078
Department:(VH) > Dept. of Clinical Sciences
Deposited By: Ylva Brandt
Deposited On:06 Apr 2006 00:00
Metadata Last Modified:02 Dec 2014 10:09

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