Heat stress of gilts around farrowing causes oxygen insufficiency in the umbilical cord and reduces piglet survival

被引：4

作者：

Zhao, W. ^{[1
]}

Artaiz, O. ^{[1
]}

Iqbal, Y. ^{[1
]}

Le, H. H. ^{[1
]}

DiGiacomo, K. ^{[1
]}

Leury, B. J. ^{[1
]}

Fothergill, L. J. ^{[2
,3
]}

Furness, J. B. ^{[2
,3
]}

Liu, F. ^{[4
]}

Green, M. P. ^{[5
]}

Finger, B. J. ^{[5
]}

Navarro, M. ^{[6
]}

Roura, E. ^{[6
]}

D'Souza, D. N. ^{[7
]}

Dunshea, F. R. ^{[1
,8
,9
]}

Plush, K. J. ^{[7
]}

Cottrell, J. J. ^{[1
]}

机构：

[1] Univ Melbourne, Fac Vet & Agr Sci, Parkville, Vic, Australia

[2] Univ Melbourne, Dept Anat & Neurosci, Parkville, Vic, Australia

[3] Florey Inst Neurosci & Mental Hlth, Parkville, Vic, Australia

[4] Rivalea Australia Pty Ltd, Corowa, NSW, Australia

[5] Univ Melbourne, Sch Biosci, Parkville, Vic, Australia

[6] Univ Queensland, Ctr Nutr & Food Sci, Queensland Alliance Agr & Food Innovat, Brisbane, Qld, Australia

[7] SunPork Grp, Eagle Farm, Qld, Australia

[8] Univ Leeds, Fac Biol Sci, Leeds, England

[9] Univ Melbourne, Fac Vet & Agr Sci, Parkville, Vic 3010, Australia

来源：

ANIMAL | 2022年 / 16卷 / 11期

关键词：

Asphyxia; Hyperthermia; Parturition; Sow; Stillbirth; RISK-FACTORS; TEMPERATURE; STILLBIRTH; PERFORMANCE; MORTALITY; ASPHYXIA; LACTATE; LEVEL; HOUSE; BIRTH;

D O I：

10.1016/j.animal.2022.100668

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

Late gestating sows are susceptible to high ambient temperatures, possibly causing farrowing complica-tions and reducing piglet survival. This experiment aimed to quantify in the days leading up to farrowing the impact of sow heat stress (HS) on farrowing physiology and survival of the piglets. Pregnant primi-parous sows (gilts) were allocated to either thermoneutral control (CON, n = 8; constant 20 degrees C) or cyclical HS conditions (n = 8; 0900 h to 1700 h, 30 degrees C; 1700 h to 0900 h, 28 degrees C) from d 110 of gestation until far-rowing completion. Gilt respiration rate, skin temperature and rectal temperature were recorded daily, and farrowing duration was quantified by video analyses. Blood samples were collected from the piglet umbilical vein at birth. At 48 h of age, piglet growth was quantified by morphometric analyses. The ther-mal exposure model induced HS and respiratory alkalosis in the gilts, as indicated by increased respira-tion rate, rectal temperature, skin temperature (all P < 0.001), plasma cortisol (P = 0.01) and blood pH (P < 0.001). Heat-stressed gilts took longer to start expelling placentae (P = 0.003), although the active farrowing duration was not significantly different between treatments. Stillbirth rates were higher in the HS group (P < 0.001), with surviving piglets at birth having lower umbilical vein partial pressure of oxygen (P = 0.04), oxygen saturation rate (P = 0.03) and tending to have increased lactate concentrations (P = 0.07). At birth, piglet skin meconium staining scores were greater in the HS group (P = 0.022). At 48 h of age, piglets from the HS group had reduced small intestinal length (P = 0.02), reduced jejunal crypt depth (P = 0.02) and lighter absolute brain weight (P = 0.001). In contrast, piglet BW, growth rate, relative organ weight and small intestinal mucosal barrier function did not change between treatments. Collectively, these findings demonstrated gilt HS during late gestation caused farrowing complications and reduced the umbilical oxygen supply to the piglets at parturition, leading to increased risks of piglet stillbirth with implications on impaired neonatal survivability and development.(c) 2022 The Authors. Published by Elsevier B.V. on behalf of The Animal Consortium. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

引用

页数：10