The influence of feeding level from 20 to 45 kilograms live weight on the performance and body composition of female and entire male pigs

Campbell, R.G.; Taverner, M.R.; Curic, D.M.

Animal Production 36(2): 193-200

1983


ISSN/ISBN: 0003-3561
Accession: 006697088

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Abstract
Pigs (42) representing equal numbers of entire males and females were used to study the effects on the performance and body composition of 4 restricted levels of feeding (14.5, 20.3, 24.9 and 29.4 MJ digestible energy/day), and of offering the same diet (14.5 MJ digestible energy per kg and 210 g crude protein per kg) ad lib between 20 and 45 kg live weight. Over the 4 restricted feeding treatments there were no significant differences between the sexes for the performance and body composition of 4 restricted levels of feeding (14.5, 20.3, 24.9 and 29.4 MJ digestible energy/day), and of offering the same diet (14.5 MJ digestible energy/kg and 210 g crude protein/kg) ad lib between 20 and 45 kg live weight. Although ad lib energy intake was the same for both sexes (34.2 MJ digestible energy/day), raising digestible energy intake from that provided by the highest restricted feeding treatment (29.4 MJ/day) to ad lib resulted in marked differences between the sexes for performance and body composition. For males, raising digestible energy intake from 29.3-34.2 MJ/day improved the rate of live-weight gain and protein deposition by 0.15 and 0.10, respectively, but had no further effect on food conversion ratio or body fat. The same increase in digestible energy intake for females improved growth rate by only 0.065, had no further effect on the rate of protein deposition but increased markedly food conversion ratio and body fat.