A step-up ractopamine (Paylean) program increases lean tissue in all sexes and decreases fat tissue in boars and immunocastrates

Document Type

Conference Proceeding

Publication Date

2005

Conference Title

Tenth Biennial Conference of the Australasian Pig Science Association

Place of Publication

Christchurch

ISBN

978-0-9806880-4-7

ISSN

1324-9177

Keywords

pigs, swine, pork

Disciplines

Animal Sciences | Meat Science

Abstract

The ß-agonist ractopamine (Paylean®1 , RAC) has recently been approved in Australia for use as a dietary ingredient to improve lean tissue mass and growth in fi nisher pigs (Dunshea et al., 1993). In gilts and barrows it appears that RAC increases lean mass without changing fat mass (Dunshea et al., 1993). However, further analyses of the limited data that exist for boars (Dunshea et al., 1993) suggest that RAC may increase lean tissue and decrease fat deposition. There are no data on the effect of RAC on body composition in immunocastrated boars (IM, boars treated with Improvac®2 at 11 and 17 weeks of age). The aim of this investigation was to determine if a step-up RAC feeding program would increase lean mass in all sexes and decrease fat mass in entire and IM male pigs.

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