Cited by 91Effects of Environmental Stressors on LivestockAnimal Nutrition and PhysiologyPhysiological and biochemical adaptations

The effects of plane of nutrition and environmental temperature on the energy metabolism of the growing pig

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Close, W. H., Mount, L. E.·1978·British Journal of Nutrition

Abstract

1. The heat losses and energy balances of thirty-eight individually housed pigs (initial body-weights 21–38 kg) were measured continuously for periods of 14 d when they were maintained at environmental temperatures of 10, 15, 20, 25 or 30°. At each temperature four levels of feeding were given approximating to once, twice and three times the maintenance energy intake and the ad lib. level. The minimal maintenance energy requirement (M) was calculated to be 440 kJ metabolizable energy (me)/kg 0.75 per d at 25°. 2. me intake at the ad lib. level decreased from 1965 kJ/kg 0.75 per d at 10° to 1202 at 30°. 3. Heat loss calculated from multiple regression analysis decreased to minimum levels between 20 and 25° 30° was within the hyperthermic zone at each plane of nutrition. 4. The partition of heat loss into its sensible and evaporative components showed that evaporation increased from 25% at 10° to 78% at 30°. 5. Critical temperature was dependent upon food intake and decreased from 23.1° at M to 20.7° at 2M, 18.0° at 3M and 16.7° at 4M. 6. The extra food required to meet extra thermoregulatory heat production per 1° below the effective critical temperature was 0.65 g/kg body-weight per d.

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Crossref · 10.1079/bjn19780142

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Authors
Close, W. H., & Mount, L. E.
Venue
British Journal of Nutrition
Published
1978-11
Volume
40
Issue
3
Pages
413-421
ISSN
  • 0007-1145 (ISSN-L)
  • 1475-2662
OpenAlex
W2398689833
Cited by
91
References
29
Citations by year
2025: 1 · 2022: 2 · 2021: 1 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 2 · 2015: 1 · 2014: 2 · 2013: 3 · 2012: 1
FWCI
10.73
Type
journal article
Language
en
Open access
Locations
  • British Journal Of Nutrition (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Effects of Environmental Stressors on Livestock
  • Life Sciences › Agricultural and Biological Sciences › Animal Science and Zoology › Animal Nutrition and Physiology
  • Physical Sciences › Environmental Science › Ecology › Physiological and biochemical adaptations
Keywords
growing pigs, energy metabolism, ambient temperature, heat loss, maintenance energy, feeding level, ad libitum feeding, evaporative heat loss, sensible heat loss, critical temperature, thermoregulation, metabolizable energy intake
MeSH terms
Animals, Animal Nutritional Physiological Phenomena, Body Temperature Regulation, Diet, Energy Metabolism, Swine, Temperature

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