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Poster De Conférence Année : 2017

Characterization of the non-genetic causes of variation of bovine milk calcium concentrations on French farms

Résumé

Our objective was to identify and quantify non-genetic factors of variation in CaC (Calcium Concentration) in milk samples collected from a significant pool of French dairy farms. This study was based on program PhénoFinLait that consisted in a survey performed between 2009 and 2010 in about a thousand dairy farms located in the major French milk production areas, with three breeds: Holstein, Normande and Montbeliarde. Information about cows' diet was gathered and individual milk samples were collected in arder to extract their mid-infrared (MIR) spectra. More than 200,000 MIR spectra were measured. We estimated CaC in milk samples from their MIR spectra. From the composition of the cow diets collected, we characterized 7 feeding strategies. The feeding strategy affected milk Ca with the constant fact that the diets based on fresh or conserved grass induced lower milk CaC regardless of the month of the year (p<0.05). The difference in CaC can be up to 100 mg/kg between two extreme diets at a given month, which was as important as the drop in CaC observed at the beginning of lactation. This study reinforced the idea that the diet of cows has an influence on milk CaC.
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Dates et versions

hal-01607526 , version 1 (02-10-2017)

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Paternité - Partage selon les Conditions Initiales

Identifiants

  • HAL Id : hal-01607526 , version 1
  • PRODINRA : 403003

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Pierre Gaignon, Catherine Hurtaud, M. Gelé, Anne Boudon. Characterization of the non-genetic causes of variation of bovine milk calcium concentrations on French farms. 12. International meeting on moutain cheese, Jun 2017, Padova, Italy. Université de Padova, 2017, Proceedings. ⟨hal-01607526⟩
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