Published in Scientific Papers. Series D. Animal Science., Vol. LVI
Written by Roxana ARGHIRIADE, Dumitru DRĂGOTOIU, Monica MARIN, Tomiţa DRĂGOTOIU, Izabela OPREA
To ensure the necessary amount of protein for dairy cows with high milk production represents for farmers a permanent challenge directed both to supply and store raw protean materials, as well as to search for the means to exploit the ruminant digestive peculiarities in terms of producing microbial endogenous protein with high biological value of non-protean nitrogen sources in terms of energy and mineral optimization. Starting from these considerations, we have achieved a formula optimization during the ‘’stable’’ period, meant for this category of animals by means of total or partial substitution of the main raw protein material in compound feed structure (soya meal) with an alternative source of nitrogen (urea) in four experimental variants of formula. For this operation, we approached the three basic levels necessary for the replacement of an organic protean source with an inorganic one, such as: adjusting the speed of decomposition at ruminating level, speed and length of nitrogen release ; to ensure a suitable level of energy support, speed and duration of release of nitrogen; creating a suitable spectrum for some mineral elements involved in microbial protein synthesis. In these circumstances, we managed the formulation of some compound feed in where the share of total provided non-protein nitrogen varied between 18.3 and 29.6%.
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mineral supplement
