Feed Preference Response of Weaner Bull Calves to Bacillus amyloliquefaciens H57 Probiotic and Associated Volatile Organic Compounds in High Concentrate Feed Pellets

Animals

Ben Hayes¹  Athol Klieve¹  Matthew Callaghan²  Peter Dart³  NguyenN. Bang⁴  David McNeill⁴  ThiThuy Ngo⁴ 

[1] Queensland Alliance for Agriculture and Food Innovation, the University of Queensland, St Lucia, QLD 4069, Australia;Ridley AgriProducts Pty Ltd., Toowong, QLD 4066, Australia;School of Agriculture and Food Sciences, the University of Queensland, Gatton, QLD 4343, Australia;School of Veterinary Science, the University of Queensland, Gatton, QLD 4343, Australia;

关键词: microbial volatile organic compounds;    odour;    microbial spoilage;    concentrate pellets;    weaned calf preference;   

DOI  :  10.3390/ani11010051

来源: DOAJ

【 摘 要 】

This study tested the hypothesis that Bacillus amyloliquefaciens strain H57 (H57) improves preference by reducing the development of microbial volatile organic compounds (mVOCs) in feed pellets. Sixteen bull calves were, for 4 weeks, provided equal access to a panel of 8 automated feed bunks in a single paddock with some hay. Each bunk contained pellets with (H57) or without (Control) the H57, each aged for 4 months at either ambient or chiller temperature. Each treatment was changed to a new bunk pair position weekly. Relative preference was determined according to weight of pellets remaining per hour per treatment bunk pair per 24 h. Pellets were analysed for volatile organic compounds (VOCs) and the concentrations tested for correlation with relative preference. Calves showed the lowest preference (p < 0.0001) for the Control/Ambient treatment whereas preference for all other treatments (H57/Ambient; H57/Chiller; Control/Chiller) was similar. The Control/Ambient treatment odour profile grouped differently to the other 3 treatments which grouped similarly to each other. Up to 16 mVOCs were determined to have potential as pre-ingestive signals for the extent of microbial spoilage. Further studies are required to find which combination of these mVOCs, when added to pellets, results in feed aversion.

【 授权许可】

Unknown