A note on the heat production of fasting pigs in the range 16 to 96 kg live weight

Abstract

SUMMARYThe results of earlier work by Breirem have been reanalysed, and some recent results are presented. Breirem's results indicated that for pigs of 16 to 96 kg live weight and fasted for 4 to 9 days, heat production (HP) was related to live weight (LW) according to:HP = 229 LW0·512which could be converted to:HP = 185 LW0·569This equation gives values for fasting heat production which are about 20% higher than those usually estimated from Breirem's results on pigs of 16 to 196 kg. The recent results, for pigs fasted for 24 hr, were slightly higher than would be indicated by the latter equation. If the values derived from the reanalysis of Breirem's data are related to several estimates of the energy required for maintenance by pigs, values for km% between 87 to 103% are obtained.

A Literature Review of Swine Heat Production

“…Their 1992 report was published in the CIGR Handbook (CIGR, 1999) and was updated in 2002 (CIGR, 2002). Body Mass (kg) Heat Production (W/pig) Breirem, 1936Holmes and Breirem, 1974Tess et al, 1984Noblet, 2002 [a] FHP = fasting heat production in W/pig; m = mass in kg. [b] --= previously developed.…”

“…Comparisons were made between four FHP studies (Breirem, 1936, as referenced by Holmes and Breirem, 1974;Holmes and Breirem, 1974;Tess et al, 1984;Noblet, 2002). Non-linear regression analyses were performed on data sets from Tess et al (1984) and Noblet (2002) using a power equation (Microsoft Excel 2002).…”

“…Non-linear regression analyses were performed on data sets from Tess et al (1984) and Noblet (2002) using a power equation (Microsoft Excel 2002). Because Breirem (1936) and Holmes and Breirem (1974) originally used power equations, the equations were modified only to change the units of HP. The resulting equations, predicted FHP, and percent increase from 1936 are shown in table 2.…”

A Literature Review of Swine Heat and Moisture

“…Changes in production performance statistics have been reported on four commercial breeds of pigs over a 10 year period (Table 1) (Anderson, 2002). Breirem (1936) and Holmes and Breirem (1974) were originally power equations, the equations were modified only to change the units of measure. The resulting equations, predicted FHP, and percent increase from 1936 are shown in Table 2.…”