title: Effect of heat stress on blood rheology in different pigs breeds.
abstract: The main objectives of the present work were to test the effects of heat stress on blood rheology and to determine whether the responses can change according to the pig breeds. Thirty-six pigs from three pig's lines (n = 12 for each line) with assumed different tolerance to heat stress were compared: Large White (LW, little tolerance), Creole (CR, good tolerance) and LW × CR pigs (produced from a cross between LW and CR lines). In a first period, all pigs were exposed to a 9-d period of thermo-neutral environment (24°C; d-9 to d-1; P0). At the end of P0, six pigs from each line were slaughtered (n = 18). Then in a second period, the remaining pigs (6/breed; n = 18) were exposed to a 5-d period of heat stress (32°C; d + 1 -d + 5; P1) and thereafter slaughtered at d + 5. Rectal and skin temperatures, as well as respiratory rate, were recorded on d-1 and d + 5. At slaughter, blood was sampled for hematological and hemorheological measurements. Heat stress caused a rise of the skin temperature and respiratory rate without any changes in the rectal temperature or on the hematological and hemorheological parameters when all pigs' lines were considered. We observed a pig line effect on blood viscosity at high shear rate (375 s-1) and red blood cell deformability at 30 Pa with CR pigs having lower blood viscosity and higher red blood cell deformability than LW pigs. While the changes of blood viscosity under heat stress did not reach statistical significance in LW and CR lines, blood viscosity (at 375 s-1) increased above the temperate values in the LW × CR line. Red blood cell deformability at 30 Pa was higher in CR pigs exposed to heat stress compared to LW pigs in the same condition. In conclusion, thermal loading caused physiological stress but did not widely change the hematological and hemorheological profiles. Although some blood rheological parameters seem to vary with the pig breeds, the responses to heat stress are very similar.
authors.affiliation: UMR Inserm 665, Université des Antilles et de la Guyane, Pointe-à-Pitre, Guadeloupe, France Laboratoire ACTES (EA 3596), Département de Physiologie, Université des Antilles et de la Guyane, Pointe-à-Pitre, Guadeloupe, France Laboratory of Excellence GR-Ex « The red cell: from genesis to death », PRES Sorbonne Paris Cité, Paris, France.
authors.forename: Xavier
authors.initials: X
authors.lastname: Waltz
authors.affiliation: Laboratoire ACTES (EA 3596), Département de Physiologie, Université des Antilles et de la Guyane, Pointe-à-Pitre, Guadeloupe, France.
authors.forename: Michelle
authors.initials: M
authors.lastname: Baillot
authors.affiliation: UMR Inserm 665, Université des Antilles et de la Guyane, Pointe-à-Pitre, Guadeloupe, France Laboratoire ACTES (EA 3596), Département de Physiologie, Université des Antilles et de la Guyane, Pointe-à-Pitre, Guadeloupe, France Laboratory of Excellence GR-Ex « The red cell: from genesis to death », PRES Sorbonne Paris Cité, Paris, France.
authors.forename: Philippe
authors.initials: P
authors.lastname: Connes
authors.affiliation: INRA UR143, Unité de Recherches Zootechniques, Petit Bourg, Guadeloupe, France.
authors.forename: Jean-Luc
authors.initials: JL
authors.lastname: Gourdine
authors.affiliation: INRA UR143, Unité de Recherches Zootechniques, Petit Bourg, Guadeloupe, France.
authors.forename: Lucien
authors.initials: L
authors.lastname: Philibert
authors.affiliation: Laboratoire ACTES (EA 3596), Département de Physiologie, Université des Antilles et de la Guyane, Pointe-à-Pitre, Guadeloupe, France Service d'Hématologie et d'Immunologie, CHU de Pointe-à-Pitre, Pointe-à-Pitre, Guadeloupe, France.
authors.forename: Eric
authors.initials: E
authors.lastname: Beltan
authors.affiliation: Laboratoire ACTES (EA 3596), Département de Physiologie, Université des Antilles et de la Guyane, Pointe-à-Pitre, Guadeloupe, France Service d'Hématologie et d'Immunologie, CHU de Pointe-à-Pitre, Pointe-à-Pitre, Guadeloupe, France.
authors.forename: Tawfik
authors.initials: T
authors.lastname: Chalabi
authors.affiliation: INRA UR143, Unité de Recherches Zootechniques, Petit Bourg, Guadeloupe, France.
authors.forename: David
authors.initials: D
authors.lastname: Renaudeau
mesh_terms: D000818:Animals; D006358:Hot Temperature; D012212:Rheology / Q000379:methods*; D013552:Swine
keywords: Hemorheology; breed; hot temperature; pigs