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Poster De Conférence Année : 2016

Ability to digest explains part to between cow feed efficiency variability

Résumé

Improving feed efficiency may be a solution to increase farms economic and environmental sustainability, through decreasing feed consumption and maintaining or increasing milk production. The main issue is to understand why inefficient cows need to consume more feed than the most efficient ones independently of their energy requirements level. Feed inefficiency could result from a lower dry matter (DM) diet digestibility: inefficient cows need to consume more feed than the efficient ones to cover their energy requirements. The aim of this study was to assess the relationship between feed efficiency and DM diet digestibility in dairy cows. Sixty Holstein cows were fed ad libitum a unique TMR during the 238 first days of lactation. Feed efficiency was defined as the residual energy intake (REI). The 60 individual REI were calculated as the residuals of the linear regression of cumulated net energy intake (UFL) not corrected for digestibility differences on cumulated requirements for fat corrected milk yield, metabolic BW, BCS, empty BW gain and empty BW loss. The cows were dosed with ytterbium oxide as an external marker during 2 periods of 14 days (2 × 5 days of rectal faecal sampling) to assess individual mean DM digestibility (known individual DM intake). Intake level (kg DMi/kg BW) explained 14% of REI variation and DM digestibility explained 9% of REI variation. Intake level explained 15% of DM digestibility variation. The more efficient the cow is, the lower the intake level is and the higher its digestibility is. Further investigation is planned to test the hypothesis that inefficient cows would be able to increase their feed efficiency through restricting their feeding level.
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Dates et versions

hal-01455933 , version 1 (03-02-2017)

Identifiants

  • HAL Id : hal-01455933 , version 1
  • PRODINRA : 378563

Citer

Amélie Fischer, Remy Delagarde, Philippe Faverdin. Ability to digest explains part to between cow feed efficiency variability. 67. Annual Meeting of the European Federation of Animal Science (EAAP), Aug 2016, Belfast, United Kingdom. Wageningen Academic Publishers, Annual Meeting of the European Association for Animal Production, 22, 2016, Annual Meeting of the European Association for Animal Production. ⟨hal-01455933⟩
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