Endocrine changes in sows exposed to elevated ambient temperature during lactation
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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Heat stress adversely affects sow reproduction, including estrus time and conception rate.
“Heat stress affects the estrus time and conception rate of sows.”
From Modeling of Heat Stress in Sows—Part 1: Establishment of the Prediction Model for the Equivalent Temperature Index of the Sows (2021) · cites this paper as [1]
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“Introduction Heat stress can affect the reproductive endocrine system in sows and inhibit the ovarian function, which in turn affects estrus activity [1], causing delayed estrus, hidden estrus or even no estrus phenomenon [2].”
Background
- 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.
- ORCID
- Estienne, M.J.
- 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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