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Poster De Conférence Année : 2018

Impact of breeding factors on milk spontaneous lipolysis in dairy cows

Résumé

Lipolysis is an enzymatic reaction which leads to off-flavour in milk and impairs technological properties of milk. Lipolysis corresponds to the hydrolysis of milk fat located in milk fat globules (MFG) by the lipoprotein lipase (LPL) and its cofactors, leading to free fatty acid accumulation. Variability of spontaneous lipolysis (SL) levels depend on individuals and on breeding systems. Five trials were set up to understand SL variations. The effect of breed, parity, physiological stage, milking frequency, milking time, feeding systems and lipid supplementation on SL were evaluated by continuous designs. The effects of milking time, feeding restriction and nature of forage on all enzymatic system were evaluated by two cross-over studies. Data were analysed using linear models. Cows from the five trials could be classified in two groups according to their phenotype: ‘susceptible’ and ‘non-susceptible’ to SL, confirming the strong impact of the individual effect. Among ‘susceptible’ cows, we confirmed the effects of breed, parity, physiological stage, milking time, milking frequency and feeding systems. SL was higher in Holstein cows’ milk than in Normande cows’ milk (P<0.001). For high merit multiparous cows, SL was higher in early lactation than in mid lactation probably due to negative energy balance. SL was also higher in late lactation than in mid and early lactation (P<0.001). SL was higher in evening milks than in morning milks (0.03
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Dates et versions

hal-01904397 , version 1 (24-10-2018)

Identifiants

  • HAL Id : hal-01904397 , version 1
  • PRODINRA : 450224

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Elise Vanbergue, Jean-Louis Peyraud, Catherine Hurtaud. Impact of breeding factors on milk spontaneous lipolysis in dairy cows. 69. Annual Meeting of the European Federation of Animal Science (EAAP), Aug 2018, Dubrovnik, Croatia. Wageningen Academic Publishers, Annual Meeting of the European Association for Animal Production, 24, 2018, Annual Meeting of the European Association for Animal Production. ⟨hal-01904397⟩
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