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Poster De Conférence Année : 2016

A meta-analysis of the effect of the diet fed to Holstein cows on their milk calcium content

Résumé

Milk Ca is an important determinant of milk coagulation and cheese-making abilities. Milk and dairy products in westernized diets also represent an optimum source of Ca. This meta-analysis aimed to determine the effect of the diet fed to the cows on the calcium content of their milk. The 611 measurements of milk calcium contents and diet composition, obtained during 31 experiments realized at the INRA experimental farm of Méjussaume, were gathered in a data basis. Each data represents an average of measurements obtained on a same individual during a period of 3 to 5 days. The experiments aimed to determine whether milk quality was affected by the nature of the forage (148 data), the nature and the amount of dietary N (108 data) or the nature and the amount of dietary energy (223 data). Milk calcium content was on average 1.19 g/kg (±0.13). It was not affected by the dietary calcium balance, i.e. the difference between calcium intake and calcium requirement, as long as the balance remained lower than 20 g/d. Above this limit, milk calcium contents declined with dietary calcium balance. In experiments comparing natures of forage, total, soluble and colloidal calcium contents of milk were lower when diets were based on pasture rather than maize silage while milk calcium contents obtained with diets based on grass silage or hay were intermediary. The dietary calcium and phosphorus balances were also higher with the diet based on pasture. Both the dietary PDI and net energy balance had slight positive effect on colloidal calcium content of milk (P<0.05) but they did not affect soluble or total calcium content. It could not be concluded from this study if the lower milk calcium content of grazing cows was explained by high dietary calcium and phosphorus balances or by other intrinsic differences between maize silage and grazed pasture.
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Dates et versions

hal-01361241 , version 1 (06-09-2016)

Identifiants

  • HAL Id : hal-01361241 , version 1
  • PRODINRA : 369787

Citer

Anne Boudon, Tiphaine Havard, Marine Gele, Benoît Rouillé, Catherine Hurtaud. A meta-analysis of the effect of the diet fed to Holstein cows on their milk calcium content. 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-01361241⟩
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