Impact of breeding factors on milk spontaneous lipolysis in dairy cows
| Autor: | Vanbergue, Elise, Peyraud, Jean-Louis, Hurtaud, Catherine |
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| Přispěvatelé: | Physiologie, Environnement et Génétique pour l'Animal et les Systèmes d'Elevage [Rennes] (PEGASE), AGROCAMPUS OUEST-Institut National de la Recherche Agronomique (INRA), Institut de l'Elevage, Institut National de la Recherche Agronomique (INRA)-AGROCAMPUS OUEST, Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro), Institut de l'élevage (IDELE) |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | 69. Annual Meeting of the European Federation of Animal Science (EAAP) 69. Annual Meeting of the European Federation of Animal Science (EAAP), Aug 2018, Dubrovnik, Croatia. Wageningen Academic Publishers, 24, 2018, Annual Meeting of the European Association for Animal Production 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 |
| Popis: | 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 |
| Databáze: | OpenAIRE |
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