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Stress and early pregnancy in sow

effect on endocrinology, ova transport and embryo development

Razdan, Pia (2003). Stress and early pregnancy in sow. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Veterinaria, 1401-6257 ; 153
ISBN 91-576-6377-7
[Doctoral thesis]

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Mixing unfamiliar breeding female pigs creates stressful situations due to aggressive interactions, which can lead to food deprivation of the more submissive animals. The aim of this thesis was to study the type of stress occurring when sows are regrouped into unfamiliar groups and to determine the effect of this type of stress during two different stages of pregnancy in multiparous sows. Ova transport rate, embryo cleavage rate, the number of spermatozoa attached to the zona pellucida and the hormonal patterns were studied in sows subjected to food deprivation or ACTH-stimulation for 48 h, immediately after ovulation in their second oestrus after weaning. In sows subjected to the same treatments during the time of maternal recognition of pregnancy, the effect on hormonal concentrations in the blood plasma and allantoic fluid was examined, as well as the conceptus growth and foetal survival rate at day 30 of pregnancy. Food deprivation decreased ova transport rate, which might be due to an impact of the elevated levels of PGF2α-metabolite on oviductal motility. Sows stimulated with ACTH had an increased level of cortisol and a decreased baseline level of PGF2α-metabolite. There was no difference in ova transport rate but ACTH-stimulated sows had decreased embryonic cleavage rate and a lower number of spermatozoa attached to the zona pellucida compared with controls, indicating an alteration in the oviductal environment. Food deprivation and ACTH-stimulation during days 13 and 14 of pregnancy had no effect on embryo survival at day 30 of pregnancy, but both treatments increased the plasma levels of cortisol. ACTH-stimulation caused a two-day delay in the increase of plasma oestrone concentration seen at day 19 of pregnancy in control sows. This delay might reflect an impeded development of the embryos. Plasma levels of cortisol, progesterone, and free fatty acids increased concomitantly with a decrease in insulin in food-deprived sows, indicating an adrenal activation as well as a catabolic metabolism with decreased metabolic clearance rate in the liver. Progesterone concentration in allantoic fluid among food-deprived sows was elevated. This increase in progesterone concentration was positively correlated with the weight of the placentas, suggesting an influence of progesterone on placenta size. Post-ovulatory stress appears to alter the oviductal environment and post-ovulatory food deprivation also induces a decrease in ova transport rate. However, multiparous, well-nursed sows appear to have the capacity to compensate for moderate stress induced around the time of maternal recognition of pregnancy.

Authors/Creators:Razdan, Pia
Title:Stress and early pregnancy in sow
Subtitle:effect on endocrinology, ova transport and embryo development
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Veterinaria
Year of publishing :May 2003
Number of Pages:44
ALLI. Razdan, P., Mwanza, A.M, Kindahl H., Hultén, F., Einarsson, S. 2001. Impact of postovulatory food deprivation on the ova transport, hormonal profiles and metabolic changes in sows. Acta veterinaria scandinavia 42, 15-25. II. Razdan, P., Mwanza, A.M., Kindahl, H., Hultén, F., Einarsson, S. 2002. Effects of repeated ACTH-stimulation on early embryonic development and hormonal profiles in sows. Animal Reproduction Science 70, 127-137. III. Razdan, P., Tummaruk, P., Kindahl, H., Rodriguez-Martinez, H., Hultén, F., Einarsson, S. Hormonal profiles and embryo survival of sows subjected to induced stress during days 13 and 14 of pregnancy. Manuscript submitted for publication. IV. Razdan, P., Tummaruk, P., Kindahl, H., Rodriguez-Martinez, H., Hultén, F., Einarsson, S. The effect of stressors during days 13 and 14 of pregnancy on the composition of allantoic fluid and conceptus development in sows. Manuscript submitted for publication.
Place of Publication: Uppsala
ISBN for printed version:91-576-6377-7
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:L Animal production > L52 Animal physiology - Growth and development
L Animal production > L53 Animal physiology - Reproduction
Subjects:Not in use, please see Agris categories
Agrovoc terms:sows, corticotropin, glucocorticoids, starvation, stress, progesterone, prostaglandins, ova, embryonic development
Keywords:ACTH, food deprivation, cortisol, progesterone, PGF2-metabolite, oestrone, ova transport, cleavage rate and foetal development
Permanent URL:
ID Code:284
Department:(VH) > Institutionen för obstetrik och gynekologi
Deposited By: Pia Razdan
Deposited On:09 May 2003 00:00
Metadata Last Modified:02 Dec 2014 10:03

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