Conséquences du stress thermique pendant la gestation sur la santé et le bien-être du porcelet

Abstract : This study is a part of a preliminary experiment on the consequences of prenatal thermal stress on pigs’ metabolism, robustness and growth performance. This internship aims to determine the consequences of thermal stress on pregnant sows on the health and welfare of their offspring during the lactation period and in post-weaning, especially focusing on the effects on immunity variables and on piglets’ corticotropic axis. The sows were exposed to temperatures above thermoneutrality (n=15, 28-34°C) or not (n=14, 18-24°C) from day 7 to day 106 of gestation. From the 110th day of gestation, in lactation and post-weaning, the sows and their piglets from the two lots were raised together, in thermoneutral conditions. The results of this study show that pregnant sows adapt well to the heat (no variation in salivary cortisol). This exposure induces a reduction in the number of blood lymphocytes in piglets at 27 days of age, just before weaning, but has a favourable impact on piglets’ health after weaning (less diarrhea and respiratory problems cases) and causes an increase in the reactivity of the corticotropic axis (increase in salivary cortisol in response to social grouping at 58 days of age). In the long term, this study will allow a better understanding of the health and economic impact of global warming on the pig industry.
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Master Thesis
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Caroline Constancis. Conséquences du stress thermique pendant la gestation sur la santé et le bien-être du porcelet. Science des productions animales. 2018. ⟨dumas-01957191⟩

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