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QUANTITATIVE INDICATORS OF MILK QUALITY AND NUTRITIONAL STATUS OF SIMMENTAL AND HOLSTEIN COWS IN THE KALNIK PIEDMONT REGION
Nataša Pintić
; Središnji laboratorij za kontrolu mlijeka, Križevci, Hrvatska
Franjo Poljak
; Središnji laboratorij za kontrolu mlijeka, Križevci, Hrvatska
Ana Dakić
; Središnji laboratorij za kontrolu mlijeka, Križevci, Hrvatska
Davorka Blažek
; Središnji laboratorij za kontrolu mlijeka, Križevci, Hrvatska
Tatjana Jelen
; Visoko gospodarsko učilište Križevci, Križevci, Hrvatska
Vinko Pintić
; Visoko gospodarsko učilište Križevci, Križevci, Hrvatska
Sažetak
Aimed at determining the indicators of milk quality and nutritional status of Simmental and Holstein cows investigations were conducted at four husbandries in the Kalnik piedmont region. Two husbandries own Simmental cows (A-SM, B-SM) and other two own Holstein cows (A-HF, B-HF). Investigations were conducted on the basis of 2nd and 3rd lactation on ten selected cows of each husbandry. Control checks were performed at the Central laboratory for milk control of the Croatian Livestock Centre by delivering samples once per month where usual analyses of milk were performed that provided needed indicators of milk quality and milk urea. With all studied cows similar milk production technology was used and all cows were held in similar environmental conditions. On the basis of the investigated 2nd and 3rd lactation realized differences in milk production per day were not significant (P>0.05) within each husbandry of Simmental and Holstein cows, but between all husbandries differences were significant (P<0.05), not dependent on breed. The results of correlation coefficient and regression analysis for A-HF (y1) husbandry show positive and weak correlation (r1 = 0.133) while on the husbandry B-HF (y2) results show positive but relatively strong correlation (r2 = 0.654) between achieved mean milking capacity per day and the concentration of milk urea (mg/1dl) at both husbandries of Holstein cows. Positive and moderately strong correlations were determined at simmental cow husbandries A-SM (y1) and B-SM (y2) between achieved mean milking capacity per day and the concentration of milk urea, at A-SM r1 = 0.491 and B-SM r2 = 0.334.
The results of milk urea concentration below 15 mg/dl were determined at A-SM husbandry on four Simmental cows of 40 studied cows and all other cows were in the range of normal concentration of milk urea which means that ratios were on the level of realized milking capacity relatively well balanced in energy and protein component regardless of determined good concentration of protein (3.19-3.38%) and milk fat (3.92-4.49%).
Investigation results of partial milking capacity (parts of lactation) of all cows show expected values of standard deviation from 365 to 804 kg with Simmental cows and from 688 to 1183 kg with Holstein cows with common variability at all heads ranging 8.71 to 17.74%.
Ključne riječi
milk production; milk quality; nutritional status; urea
Hrčak ID:
26508
URI
Datum izdavanja:
30.4.2007.
Posjeta: 2.022 *