caa a22 4500 386320489 CHVBK 20180307111624.0 cr unu---uuuuu 161130e198812 xx s 000 0 eng 10.1017/S0003356100003615 doi S0003356100003615 pii (NATIONALLICENCE)cambridge-10.1017/S0003356100003615 Influence of diurnally fluctuating high temperature on growth and energy retention of growing pigs [Elektronische Daten] Abstract The effects of two temperatures (thermoneutral, 22°C v. fluctuating high temperature, 35·22°C), four food levels (ad libitum and three levels of food restriction) on growth and energy retention of growing pigs (male and female) was investigated in a 2 × 2 × 4 factorial experiment involving 48 individually penned pigs from 20 to 50 kg live weight. A second experiment was conducted over the 50 to 80 kg liveweight range using a 2 × 2 × 3 design. Mean daily digestible energy (DE) intake, daily gain, P2 backfat thickness, carcass fat proportion, total body energy retained and body energy retained as protein did not differ significantly between the temperature treatments in either experiment. Mean carcass protein proportion was greater at 35·22°C than at a constant 22°C. With pigs given food ad libitum during the 50 to 80 kg phase, an increase in temperature from 22°C to 35·22° reduced daily DE intake by 4·1 MJ (38·9 v. 34·8 MJ or 300 g food per day), reduced energy retention by 2·3 MJ/day (15·6 v. 13·3 MJ/day), and increased carcass protein proportion by 11 g/kg (142 v. 153 g/kg). There was a significant interaction between the effects of sex and temperature on P2 backfat thickness over both live-weight ranges. Female pigs housed at 35·22°C had 2·6 mm less P2 backfat at 50 kg (13 v. 15·6 mm) and 2 mm less at 80 kg (20 v. 22 mm) compared with females housed at 22°C. The P2 backfat thickness of male pigs did not vary at 50 kg (13·2 v. 13·5 mm) but when housed at 35·22°C males had 1·4 mm more P2 backfat at 80 kg (18·2 v. 19·6 mm). Copyright © British Society of Animal Science 1988 Giles L. R. Department of Agriculture, North Coast Agricultural Institute, Wollongbar, NSW 2480, Australia Dettmann E. Belinda Department of Agriculture, North Coast Agricultural Institute, Wollongbar, NSW 2480, Australia Lowe R. F. Department of Agriculture, North Coast Agricultural Institute, Wollongbar, NSW 2480, Australia Animal Production Cambridge University Press 47/3(1988-12), 467-474 0003-3561 47:3<467 1988 47 ASC https://doi.org/10.1017/S0003356100003615 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0003356100003615 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Giles L. R. Department of Agriculture, North Coast Agricultural Institute, Wollongbar, NSW 2480, Australia NATIONALLICENCE 700 1- Dettmann E. Belinda Department of Agriculture, North Coast Agricultural Institute, Wollongbar, NSW 2480, Australia NATIONALLICENCE 700 1- Lowe R. F. Department of Agriculture, North Coast Agricultural Institute, Wollongbar, NSW 2480, Australia NATIONALLICENCE 773 0- Animal Production Cambridge University Press 47/3(1988-12), 467-474 0003-3561 47:3<467 1988 47 ASC CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge