N. N. Gorb1, S. N. Gudkov1 , A. Intkhanukhak1 , E. Yu. Smertina2
1 Novosibirsk State Agrarian University, Novosibirsk, Russia
2 Siberian Federal Scientific Center for Agrobiotechnologies of the Russian Academy of Sciences, Krasnoobsk settlement, Novosibirsk region, Russia
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Volume 25 No. 10
Date of paper submission: 05.02.2025, date of review: 02.05.2025, date of acceptance: 15.07.2025.
Published: 10/31/2025
Abstract. The purpose is to study the effect of heat stress on some reproductive parameters of Landrace sows inseminated before, during and after exposure to high temperatures in an industrial pig farm. Methods. The data for analysis were obtained from a large pig farm. The object of the study was 464 Landrace sows divided into groups depending on the time of exposure to high temperatures: group 1 – sows inseminated before exposure to elevated temperatures, group 2 – sows inseminated during exposure to high temperatures, group 3 – sows inseminated after exposure to high temperatures. The subject of the study was the effect of heat stress on: fertility, prolificacy, number of live, productive, underdeveloped, stillborn and mummified piglets. Scientific novelty. A comparative analysis of the effect of heat stress on conception rate, litter live-born piglets, underdeveloped, stillborn, and mummified piglets in Landrace sows was performed for the first time on a large pig population. High sensitivity of sows of this breed to heat stress was revealed. Results. It was found that heat stress had the most pronounced destructive effect on sows inseminated during the period of high temperatures. In comparison with sows inseminated before exposure to high temperatures, their conception rate decreased by 7.43 % (р ≤ 0.001). The number of productive piglets in the 2nd group was 11.74 and 12.37 % (р ≤ 0.001) less than in the 1st and 3rd groups; and the number of weak and stillborn piglets naturally increased by 0.52, 5.53 % (р ≤ 0.01), and 11.22, and 6.84 % (р ≤ 0.001). Thus, when inseminating sows during periods of exposure to high temperatures, the enterprise lost 2, and more often 3, conditional business piglets from each sow.
Keywords: heat stress, sows, Landrace breed, reproductive indicators, fertility, multiple pregnancy
For citation: Gorb N. N., Gudkov S. N., Intkhanukhak A., Smertina E. Yu. The effect of heat stress on reproductive performance of Landrace sows. Agrarian Bulletin of the Urals. 2025; 25 (10): 1615‒1627. https://doi.org/10.32417/1997-4868-2025-25-10-1615-1627 (In Russ.)
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