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Communication Dans Un Congrès Année : 2006

Comparative evaluation of the transfer of two forms of Vitamin A into milk of dairy cows

Résumé

Eight Holstein lactating dairy cows (6 primiparous and 2 multiparous) were assigned in a cross over design with two treatments and two periods. The two treatments consisted of spot supply of 2 different forms of Vitamin A containing 1 million IU Vitamin A per g (300 mg retinol): products A (Microvit A SupraTM 1000, Adisseo France SAS) and B (RovimixTM A 1000, DSM) differed by their coating technology. Each period consisted of 3 weeks depletion (ration without Vitamin A supplementation) and one week measurements. A basal diet without Vitamin A supplementation, consisting of (%DM): corn silage (68.2), wheat straw (6.7), cracked wheat (9.5), SBM (14.2) and minerals (1.4), was supplied during all the trial. During the measurement week, control milk was collected during the 2 milking times on the rst experimental day. The second day a spot dose of 1 Million IU of vitamin A was orally supplied and milk samples were collected for 8 consecutive milkings. Milk yield was individually recorded and retinol concentrations determined in milk samples. The variations of retinol concentrations and quantities were used to calculate the Area Under the Curves (AUC), which were statistically compared for the two treatments. Although large variations between cows, AUC values were respectively for products A and B, 4068 and 3068 for milk retinol concentrations, (p<0.01) (SED: 433) and 52.9 and 35.9 for milk retinol quantities (p<0.01) (SED: 4.8). The increases of retinol quantities passed into the milk (quantities in the milk after spot supply minus control values) were 68.2 mg and 41.5 mg respectively for products A and B (p<0.01) (SED: 7.2). The retinol transfer ratios were: (%) 22.7 and 13.8 respectively for products A and B (p<0.01) (SED: 2.4). In conclusion, the higher transfer of retinol into milk with Microvit A Supra 1000 shows its better bioavailability in relation with its specific coating technology preventing it from ruminal degradation.

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Dates et versions

hal-02758163 , version 1 (04-06-2020)

Identifiants

  • HAL Id : hal-02758163 , version 1
  • PRODINRA : 19103

Citer

Stefan Jurjanz, Yves Le Roux, F. Rouffineau, Cédric Robert Robert. Comparative evaluation of the transfer of two forms of Vitamin A into milk of dairy cows. American Dairy Science Association - American Society of Animal Science 2006 Joint annual Meeting, Jun 2006, Minneapolis, United States. ⟨hal-02758163⟩
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