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2004 - 274 p.

Estimation of protein availability in ruminant feeds: A comparison of different methodologies

Yáñez Ruiz D.R., Molina Alcaide E., Weisbjerg M.R., Hvelplund T.

Intestinal digestibility of undegraded feed protein is an important parameter in modern protein evaluation systems for ruminants. Different methods may estimate the intestinal digestibility of a wide range of feeds. Three methods based on the: acid detergent insoluble nitrogen (ADIN) content, protein disappearance from the mobile bag and in vitro intestinal digestibility using a preincubation stage in both sheep and goats were compared. Different feedstuffs were used in the experiment. N post-ruminal availability of olive by-products was low and varied depending on factors such as year or treatment. Compared with the mobile bag technique, total N digestibility was overestimated by the in vitro method. If N disappearance from the mobile bag is accepted as a physiologically reasonable estimation for in vivo true protein digestibility, acid detergent soluble nitrogen (ADSN) content and the in vitro method may give good estimates of digestibility of N although some differences between by-products and conventional feeds are observed.

Mots-clés    

AZOTE, DIGESTIBILITE, INTESTIN, RUMINANT, SOUS-PRODUIT, TECHNIQUE DE PREVISION

Citer cet article    

Yáñez Ruiz D.R., Molina Alcaide E., Weisbjerg M.R., Hvelplund T. Estimation of protein availability in ruminant feeds: A comparison of different methodologies. In : Ben Salem H. (ed.), Nefzaoui A. (ed.), Morand-Fehr P. (ed.). Nutrition and feeding strategies of sheep and goats under harsh climates . Zaragoza : CIHEAM, 2004. p. 127-132. (Options Méditerranéennes : Série A. Séminaires Méditerranéens; n. 59). 9. Seminar of the Sub-Network on Nutrition of the FAO-CIHEAM Inter-Regional Cooperative Research and Development Network on Sheep and Goats, 2001/11/08-10, Hammamet (Tunisia). http://om.ciheam.org/om/pdf/a59/04600018.pdf