Cited by 114Effects of Environmental Stressors on LivestockReproductive Physiology in LivestockHypothalamic control of reproductive hormones

Endocrine changes in sows exposed to elevated ambient temperature during lactation

Barb, C.R., Estienne, M.J., Kraeling, R.R., Marple, D.N., Rampacek, G.B., Rahe, C.H., Sartin, J.L.·1991·Domestic Animal Endocrinology

Abstract

Seven sows were placed into one of two environmental chambers at 22 C, 5 d prior to farrowing. On day 9 of lactation, one chamber was changed to 30 C (n = 4) and the other remained at 22 C (n = 3). On days 24 and 25, blood samples were collected every 15 min for 9 hr and 7 hr, respectively. On day 24, thyrotropin releasing hormone (TRH) and gonadotropin releasing hormone (GnRH) were injected iv at hour 8. On day 25 naloxone (NAL) was administered iv at hour 4 followed 2 hr later by iv injection of TRH and GnRH. Milk yield and litter weights were similar but backfat thickness (BF) was greater in 22 C sows (P less than .05) compared to 30 C sows. Luteinizing hormone (LH) pulse frequency was greater (P less than .003) and LH pulse amplitude was less (P less than .03) in 22 C sows. LH concentrations after GnRH were similar on day 24 but on day 25, LH concentrations after GnRH were greater (P less than .05) for 30 C sows. Prolactin (PRL) concentrations were similar on days 24 and 25 for both groups. However, PRL response to TRH was greater (P less than .05) on both days 24 and 25 in 30 C sows. Growth hormone (GH) concentrations, and the GH response to TRH, were greater (P less than .0001) in 30 C sows. Cortisol concentrations, and the response to NAL, were less (P less than .03) in 30 C sows. NAL failed to alter LH secretion but decreased (P less than .05) PRL secretion in both groups of sows. However, GH response to NAL was greater (P less than .05) in 30 C sows. Therefore, sows exposed to elevated ambient temperature during lactation exhibited altered endocrine function.

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Crossref · 10.1016/0739-7240(91)90046-m

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Authors
Barb, C. R., Estienne, M. J., Kraeling, R. R., Marple, D. N., Rampacek, G. B., Rahe, C. H., & Sartin, J. L.
Affiliations
  • United States Department of Agriculture (US)
  • University of Georgia (US)
  • Auburn University (US)
Corresponding author
Barb, C.R.
Venue
Domestic Animal Endocrinology
Publisher
Elsevier BV
Published
1991-01
Volume
8
Issue
1
Pages
117-127
ISSN
0739-7240 (ISSN-L)
OpenAlex
W2004270939
Cited by
114
References
52
Citations by year
2026: 1 · 2025: 3 · 2024: 1 · 2023: 6 · 2022: 4 · 2021: 3 · 2020: 4 · 2019: 1 · 2018: 1 · 2017: 2 · 2016: 1 · 2015: 4 · 2014: 1 · 2013: 2 · 2012: 5
FWCI
6.65
Type
journal article
Language
en
Open access
closed
Locations
  • Domestic Animal Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Effects of Environmental Stressors on Livestock
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Reproductive Physiology in Livestock
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
Keywords
sows, high ambient temperature, heat stress, lactation, luteinizing hormone secretion, prolactin, growth hormone, cortisol, thyrotropin-releasing hormone, gonadotropin-releasing hormone, naloxone, backfat thickness
MeSH terms
Animals, Eating, Female, Hot Temperature, Hydrocortisone, Lactation, Luteinizing Hormone, Gonadotropin-Releasing Hormone, Naloxone, Progesterone, Prolactin, Swine, Thyrotropin-Releasing Hormone

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