title: Effect of daily fluctuations in ambient temperature on reproductive failure traits of Landrace and Yorkshire sows under Thai tropical environmental conditions.
abstract: The aim of this study was to determine the effects of daily ranges and maximum ambient temperatures, and other risk factors on reproductive failure of Landrace (L) and Yorkshire (Y) sows under an open-house system in Thailand. Daily ambient temperatures were added to information on 35,579 litters from 5929 L sows and 1057 Y sows from three commercial herds. The average daily temperature ranges (ADT) and the average daily maximum temperatures (PEAK) in three gestation periods from the 35th day of gestation to parturition were classified. The considered reproductive failure traits were the occurrences of mummified fetuses (MM), stillborn piglets (STB), and piglet death losses (PDL) and an indicator trait for number of piglets born alive below the population mean (LBA). A multiple logistic regression model included farrowing herd-year-season (HYS), breed group of sow (BG), parity group (PAR), number of total piglets born (NTB), ADT1, ADT2, ADT3, PEAK1, PEAK2, and PEAK3 as fixed effects, while random effects were animal, repeated observations, and residual. Yorkshire sows had a higher occurrence of LBA than L sows (P = 0.01). The second to fifth parities sows had lower reproductive failures than other parities. The NTB regression coefficients of log-odds were positive (P < 0.01) for all traits. Narrower ranges of ADT3 increased the occurrence of MM, STB, and PDL (P < 0.01), while higher PEAK3 increased the occurrence of MM, STB, PDL, and LBA (P < 0.001). To reduce the risk of reproductive failures, particularly late in gestation, producers would need to closely monitor their temperature management strategies.
authors.affiliation: Department of Animal Science, Faculty of Agriculture, Kasetsart University, Bangkok, 10900, Thailand.
authors.forename: Teerapong
authors.initials: T
authors.lastname: Jaichansukkit
authors.affiliation: Department of Animal Science, Faculty of Agriculture, Kasetsart University, Bangkok, 10900, Thailand. agrtts@ku.ac.th.
authors.forename: Thanathip
authors.identifier: http://orcid.org/0000-0002-9707-6428
authors.initials: T
authors.lastname: Suwanasopee
authors.affiliation: Department of Animal Science, Faculty of Agriculture, Kasetsart University, Bangkok, 10900, Thailand.
authors.forename: Skorn
authors.initials: S
authors.lastname: Koonawootrittriron
authors.affiliation: Department of Obstetrics, Gynaecology and Reproduction, Faculty of Veterinary Science, Chulalongkorn University, Bangkok, 10330, Thailand.
authors.forename: Padet
authors.initials: P
authors.lastname: Tummaruk
authors.affiliation: Department of Animal Sciences, University of Florida, Gainesville, FL, 32611-0910, USA.
authors.forename: Mauricio A
authors.initials: MA
authors.lastname: Elzo
mesh_terms: D000034:Abortion, Veterinary; D000818:Animals; D005260:Female; D005313:Fetal Death; D008098:Litter Size; D016015:Logistic Models; D010298:Parity; D036801:Parturition; D010641:Phenotype; D011247:Pregnancy; D012098:Reproduction; D012307:Risk Factors; D012621:Seasons; D013552:Swine / Q000502:physiology*; D013696:Temperature; D013785:Thailand; D014329:Tropical Climate
keywords: Ambient temperature; Reproduction; Risk factors; Swine; Tropic