Izvorni znanstveni članak
INFLUENCE OF FEEDING ON QUANTITY AND MILK COMPOSITION ON THE DAIRY FARM OF THE KRIŽEVCI AGRICULTURAL HIGH SCHOOL
Dražen Čuklić
; Visoko gospodarsko učilište Križevci, Hrvatska
Tatjana Jelen
; Visoko gospodarsko učilište Križevci, Hrvatska
Franjo Poljak
; Hrvatski stočarski centar Zagreb, Hrvatska
Josip Crnčić
; Srednja gospodarska škola Križevci, Hrvatska
Dejan Marenčić
; Visoko gospodarsko učilište Križevci, Hrvatska
Sažetak
For milk producers and milk buyers milk chemical composition is a parameter for determining buying up milk price. For nutritionists, the amount of urea in milk is an indicator of dairy cows status. In the years 2004., 2005. and 2006. at the Krizevci Agricultural high school dairy farm was quarterly monitored amount of milk. Milk composition and amount of urea in individual samples were analyzed in the Central laboratory for milk control quality at Krizevacka Poljana. In each controlled period after milk and ration analyses, were done corrections ration resulting in the changes in milk amount and composition. At the beginning the urea amount varied from very low level of 5,38 mg/dl to 15-20 mg/dl in the middle of control, and ending with 25 mg/dl. Increase of urea amount was followed by increased milk amount from 14.46 kg at the beginning to by 26.52 kg at the end of the monitored period. Statistically very high positive correlation (P<0,001) between milk protein content and
fatless dry milk substance was affirmed in all controls. Very high correlation (P<0,001) was also identified between milk fat content and dry substance in milk between third and tenth control, which could be explained by increased amount of ration crude fiber.
Ključne riječi
cows in lactation; urea; influence of feeding
Hrčak ID:
28923
URI
Datum izdavanja:
9.10.2008.
Posjeta: 1.948 *