Confronto tra due tecniche di gestione della mandria di vacche da latte - con o senza ritorno notturno alla stalla [Piemonte]. Comparison de deux techniques de conduite du tropeau de vaches laitieres - avec au sans nuit a l' etable [Piemont].
1993
Cavallero A. | Pascal G. | Reyneri A. | Talamucci P.
In an Alpine pasture (S.W. Italian Alps, 2.200 m altitude), during 4 grazing seasons (1987-1990) of about 60 days, 2 herds of 15-18 "Piemontese" dairy cows were managed according to 2 different systems. The first group (E) grazed 12 hours during the day, spending the night in the shed, 200-1.800 m far from the pasture, with a gradient of 100-300 m. The cows of the second group (P) remained on the pasture overnight and were milked in the paddock. The pasture (27 ha) was divided into 6 couples of similar paddocks, assigned to the two managements. The cows fed only on grass. After a 4 years' trial, the evolution of vegetation was characterized by an important raise of pasture quality (VP), thanks to a decrease of Nardus stricta and an increase of good grasses (mainly Festuca nigrescens). The two management systems attained no difference on the vegetation. because of its permanence in the shed, the herd E grazed every day, as an average, 2 hours less than P; hence a higher intake for P (+12%) and a little more production milk. The return of dung on the pasture was higher for P, and its distribution resulted more abundant on easy slopes. Using local cows, adapted to the environment, the exposure to harsh weather was counterbalanced by a better utilization of the herbage. The simplification of herd management by rotational grazing with cows permanently on the pasture seems to be feasible even in high altitude Alpine conditions.
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