Izvorni znanstveni članak
Changes in the chemical composition of milk and milk fat to protein ratio compared to the amount of milk produced
Dražen Đuričić
orcid.org/0000-0002-8013-2091
; Mount-trade d.o.o., Garešnica, Hrvatska
Ana Zupčić
Jozo Grbavac
; Agronomski i prehrambeno-biotehnološki fakultet Sveučilišta u Mostaru
Marko Samardžija
orcid.org/0000-0003-0402-3173
; Veterinarski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Sažetak
The aim of the study was to determine any correlation between milk quantity and the chemical composition of milk and milk fat to protein ratio of Holstein breed cows. The study was conducted on cows of the Holstein breed at the age of 2-5 years. The cows were divided into three groups according to the daily average amount of milk produced (DAM): group A cows <15 kg DAM (n=8), group B 15-25 kg DAM (n=8) and group C ≥25 kg DAM (n=8). The parameters investigated were: milk fat, proteins, lactose and urea, and the number of somatic cells. The statistically significant parameters between the investigated three animal groups (P<0.05) were protein content (%) and milk fats (%), the total amount of milk in 305 days of lactation, and the average daily amount of milk. It was concluded that the higher the milk production over 305 days of lactation, in terms of the average daily amount of milk, the lower the percentage of milk fat and protein in the total milk composition.
Ključne riječi
Holstein cows; Milk; Chemical composition
Hrčak ID:
263639
URI
Datum izdavanja:
1.6.2021.
Posjeta: 802 *