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EFFECT OF ENERGY LEVEL OF RATIONS IN DRY PERIOD AND EARLY LACTATION ON PRODUCTION OF HIGH YIELDING DAIRY COWS
Zvonimir Uremović
; Agronomski fakultet, Zagreb, Republika Hrvatska
Marija Uremović
; Agronomski fakultet, Zagreb, Republika Hrvatska
Jasmina Lukač-Havranek
; Agronomski fakultet, Zagreb, Republika Hrvatska
Ljupko Tabaković
; Vupik, Vukovar, Republika Hrvatska
Sažetak
Effects of different energy levels in rations offered during the 50 days of dry period (1,57 M.R. and 1.93 M.R.) and different concentration of net energy in rations, 105.0 and 115.0% F. U., in dry matter of rations during the 90 days of early lactation, were studied on four groups of HF cows, 11 in each. The cows were ted rations of different energy levels: low - low, low - high, high - low and high - high during the dry period and in early lactation. Feeding rations of different energy levels in the dry period did not influence milk production in
early lactation. Feeding cows complete rations ad lib. and with higher concentration of net energy significantly increased daily milk production and 4% FCM (P) and nonsignificantly total production
of 4% FCM (P>0,05) during the 90 days of early lactation. The least feed consumption per one kg of 4 % FCM was observed in the group fed low - high energy level. The least utilization of the feed in milk production was observed in the group fed high - high energy level. Cows fed rations with high concentration of energy in early lactation consumed more concentrates per one kg of 4 % FCM. Cows fed low - high and high - high energy levels reached earlier and higher peak of their milk production, which accounted for a nonsignificant increase of total production of 4% FCM. Based on results of testing, it comes out that feeding rations with low - high energy level during the dry period and early lactation represents a basis for i better utilization of production facilities and milk production of HF cows.
Ključne riječi
Hrčak ID:
162412
URI
Datum izdavanja:
22.5.1992.
Posjeta: 643 *