@article{MAKHILLJAVA201211133556,
    title = {Effects of Fasting Duration and Body Weight on Fasting Heat Production in 
  Growing Pigs},
    journal = {Journal of Animal and Veterinary Advances},
    volume = {11},
    number = {13},
    pages = {2333-2341},
    year = {2012},
    issn = {1680-5593},
    doi = {javaa.2012.2333.2341},
    url = {https://makhillpublications.co/view-article.php?issn=1680-5593&doi=javaa.2012.2333.2341},
    author = {D.F.,Q.,F.L.,X.S.,J.J. and},
    keywords = {Body weight,fasting duration,fasting heat production,pigs,experement,China},
    abstract = {Two experiments were conducted to determine the effects of fasting duration and body weight on the fasting heat production of Duroc x Large White x Landrace crossbred barrows. In exp. 1, 6 pigs were fasted for 96 h. Heat production was measured every 12 h and the experiment was repeated at 3 separate body weights (31.1&plusmn;1.1, 50.3&plusmn;0.8 and 89.7&plusmn;1.2 kg) to investigate the effects of different fasting durations on heat production and substrate oxidation. In Exp. 2, 12 Duroc x Large White x Landrace crossbred barrows were used to determine the effect of different body weights on fasting heat production. Fasting heat production was measured at 35.6&plusmn;2.4, 44.7&plusmn;3.1, 53.4&plusmn;2.8, 63.9&plusmn;2.7, 73.4&plusmn;2.4, 83.3&plusmn;3.0 and 95.6&plusmn;2.0 kg following a fast of 48 h for the 35.6 as well as 44.7 pigs and a fast of 72 h for pigs at the remaining body weights. Before fasting, pigs were fed twice daily at 09:00 and 17:00. Fasting heat production was measured using indirect calorimetry after pigs were deprived of feed and the temperature was controlled at 24&plusmn;1&deg;C for pigs weighing 35.6 and 44.7 kg and 22&plusmn;1&deg;C for pigs weighing 53.4-95.6 kg. The results of exp. 1 showed that the heat production decreased rapidly in the first 48 (31.1 kg) and 60 h (50.3 and 89.7 kg) of fasting (p&lt;0.05) and then reached a stable period (p&gt;0.05) between 48-96 (31.1 kg) and 60-96 h (50.3 and 89.7 kg) of fasting, respectively. In Exp. 2, with an increase in body weights (35.6-95.6 kg) the fasting heat production of pigs went up from 1577-2683 kcal day<SUP>-1</SUP>. In conclusion, the fasting heat production was 220 kcal/kg BW<SUP>0.55</SUP>/day (R<SUP>2</SUP> = 0.97, p = 0.01) in pigs with body weights from 35.6-95.6 kg.}
    }