Feeding Behavior of Finishing Pigs under Diurnal Cyclic Heat Stress

The impact of cyclic heat stress (CHS) and turning the lights on and off on pig feeding behavior (FB) was investigated. The FB of 90 gilts was recorded in real-time under two ambient temperatures (AT): thermoneutrality (TN, 22 °C) or CHS (22/35 °C). The day was divided into four periods: PI (06–08 h...

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Detalles Bibliográficos
Autores: de Oliveira, Marllon José Karpeggiane [UNESP], Valk, Marcio, Melo, Antônio Diego Brandão [UNESP], Marçal, Danilo Alves [UNESP], Silva, Cleslei Alisson [UNESP], Valini, Graziela Alves da Cunha [UNESP], Arnaut, Pedro Righetti [UNESP], Gonçalves, Joseane Penteado Rosa [UNESP], Andretta, Ines, Hauschild, Luciano [UNESP]
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:Brasil
Institución:Universidade Estadual Paulista (UNESP)
Repositorio:Repositório Institucional da UNESP
Idioma:inglés
OAI Identifier:oai:repositorio.unesp.br:11449/249750
Acceso en línea:http://dx.doi.org/10.3390/ani13050908
http://hdl.handle.net/11449/249750
Access Level:acceso abierto
Palabra clave:circadian rhythm
feed pattern
light program
meal pattern
precision feeding
swine
Descripción
Sumario:The impact of cyclic heat stress (CHS) and turning the lights on and off on pig feeding behavior (FB) was investigated. The FB of 90 gilts was recorded in real-time under two ambient temperatures (AT): thermoneutrality (TN, 22 °C) or CHS (22/35 °C). The day was divided into four periods: PI (06–08 h); PII (08–18 h); PIII (18–20 h); and PIV (20–06 h). Automatic and Intelligent Precision Feeders recorded each feed event for each pig. An estimated meal criterion (49 min) was used to calculate the FB variables. Feed behavior in both ATs followed a circadian pattern. The CHS reduced the feed intake by 6.9%. The pigs prioritized feed intake during the coolest hours of the day; however, nocturnal cooling did not allow the pigs to compensate for the reduced meal size due to CHS. The highest meal size and most of the meals were observed during the lighting-on period. The pigs reduced their interval between meals during PII and PIII. The lighting program increased the meal size when the lights were switched on and reduced the meal size when the lights were switched off. Thus, the dynamics of the FB were largely influenced by AT, whereas the meal size was affected by the lighting program.

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