Effect of Season and Outdoor Climate on Litter Size at Birth in Purebred Landrace and Yorkshire Sows in Thailand
Open accessAbstract
The objective of the present study was to retrospectively investigate causes of variation on litter size at birth (total number of piglets born per litter (TB) and number of piglets born alive per litter (BA)) of Landrace (L) and Yorkshire (Y) sows in swine nucleus herds in Thailand. The data included sows farrowed during a four-year period from January 1998 to December 2001. The analyzed data set included observations on 8020 litters from 2199 L sows and 6919 litters from 1680 Y sows. Analysis of variance (ANOVA) was applied for statistical analyses using General Linear Mixed Model (MIXED) procedure of SAS. No breed difference was found for both TB and BA. Farrowing months significantly influenced TB and BA (P<0.001). Sows farrowed in August and September had a lower BA than sows farrowed from November to June (P<0.05). Effect of farrowing months on both TB and BA was more pronounced in primiparous compared with multiparous sows. Average minimum daily temperature during gestation negatively correlated with both TB and BA, average maximum daily temperature during gestation negatively correlated with BA and average daily humidity during gestation negatively correlated with both TB and BA. The correlations were stronger in L than in Y sows.
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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 [4]
The Discussion (page not provided) reports that heat stress during days 0–16 of pregnancy decreased conception rate in gilts, citing an experimental study. The paper does not report that heat stress affects estrus time; its mention of oestrus in Materials and Methods concerns when gilts were mated. (LLM, conf=0.86)
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Cites
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Physiological mechanisms through which heat stress compromises reproduction in pigs
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“Heat stress can reduce fertility rate [3,4], decrease piglet weight gain [5], decrease milk production [6], increase weight loss through lactation [5] and increase death rate [7].”
Background
- Authors
- TUMMARUK, P., TANTASUPARUK, W., TECHAKUMPHU, M., & KUNAVONGKRIT, A.
- Affiliations
- Chulalongkorn University (TH)
- ORCID
- TUMMARUK, Padet
- Venue
- Journal of Veterinary Medical Science
- Published
- 2004
- Volume
- 66
- Issue
- 5
- Pages
- 477-482
- ISSN
- 0916-7250 (ISSN-L)
- 1347-7439
- OpenAlex
- W2022612682
- Cited by
- 66
- References
- 17
- Citations by year
- 2026: 2 · 2025: 2 · 2023: 4 · 2022: 5 · 2021: 4 · 2020: 4 · 2019: 4 · 2018: 3 · 2017: 6 · 2016: 3 · 2015: 3 · 2014: 3 · 2013: 2 · 2012: 5
- FWCI
- 4.51
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- cc-by-nc-nd
- Locations
- Journal of Veterinary Medical Science (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- Funders
- Chulalongkorn University
- 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
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and phenotypic traits in livestock
- Keywords
- litter size at birth, outdoor climate, primiparous sows, multiparous sows, Landrace sows, swine reproduction, Thailand
- MeSH terms
- Analysis of Variance, Animals, Animal Husbandry, Female, Humidity, Litter Size, Seasons, Temperature, Thailand, Linear Models, Sus scrofa
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