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Intérêt de la luzerne déshydratée dans des rations complètes pour vaches laitières en début de lactation

Abstract : Two trials were performed in order to study the interest of 3 kg dehydrated alfalfa (18% crude protein content, fibres of a few centimetres) in maize and grass silage diets. Multiparous dairy cows (27 Montbeliard and 27 Holstein) received complete experimental diets during the first 15 weeks of lactation. The use of 3 kg dehydrated alfalfa permitted to reduce the quantity of soybean meal without reducing the energy and crude protein in the feed supply. DM intake was increased when cows were fed alfalfa (23.4 versus 21.1 kg/d; P < 0.001). But this higher DM intake did not permit to increase milk production which was 31.1 kg/d. Milk fat content was unaffected by the dehydrated alfalfa (43.0 g/kg). Adding alfalfa increased milk protein content (31.2 versus 32.3 g/kg; P < 0.05) without changing the milk casein content. In this experiment with individually fed cows, we noticed that many dairy cows did not easily consume dehydrated alfalfa. Calculated nitrogen excretion was more important with the alfalfa diet (372 versus 321 g N/d; P < 0.001) because DM intake was higher with an inadequate N mobilisation in milk protein. At the beginning of lactation, weight and fattening score variations were unaffected by the diets. No difference was noticed for reproduction capacities. Although it is difficult to study animal health with only a few animals, added alfalfa might decrease mastitis risks by improving animal health due to the neutralisation power of alfalfa and reducing acidosis conditions.
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  • HAL Id : hal-02676885, version 1
  • PRODINRA : 132
  • WOS : 000177067300004

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Vincent Thenard, M. Mauriès, Jean-Marie Trommenschlager. Intérêt de la luzerne déshydratée dans des rations complètes pour vaches laitières en début de lactation. Productions animales, Institut National de la Recherche Agronomique, 2002, 15 (2), pp.119-124. ⟨hal-02676885⟩

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