Izvorni znanstveni članak
https://doi.org/https://doi.org/10.5513/MSNE2250
Effects of Stevia rebaudiana and Hippophae rhamnoides on dairy cow metabolism and milk quality
Radena Nenova
; Agricultural Academy - Sofia, Agricultural Institute - Shumen, Bulgaria
Stanimir Enchev
; Agricultural Academy - Sofia, Agricultural Institute - Shumen, Bulgaria
Sažetak
The present study aimed to evaluate the effects of the phytogenic feed additives
Stevia rebaudiana Bertoni and Hippophae rhamnoides on the serum biochemical
profile and physicochemical characteristics of milk in dairy cows. Thirty clinically
healthy Black-and-white dairy cows were assigned to three experimental groups
(Each group n = 10) using the analogue-group method: a control group (C), a Stevia
rebaudiana group (SR) receiving 100 g/day of dried stevia leaves, and a Hippophae
rhamnoides group (HR) receiving 100 g/day of dried sea buckthorn leaves over
a period of 30 days. No formal randomisation procedure was applied. Serum
concentrations of alanine aminotransferase (ALT), aspartate aminotransferase
(AST), urea, glucose, total cholesterol, high-density lipoprotein (HDL) cholesterol,
low-density lipoprotein (LDL) cholesterol, and triglycerides were determined
on Days 0 and 30, while milk was analysed on Day 30. Supplementation had no
statistically significant effect on milk fat, protein, lactose, total solids, solids-notfat,
density, pH, titratable acidity, ash content, or freezing point (p > 0.05). No
significant changes were observed in serum AST activity, urea concentration, or
glucose levels. Although ALT activity increased significantly in both supplemented
groups, the recorded values remained within physiological reference limits. Both
supplements had a positive effect by reducing total cholesterol, LDL cholesterol,
and triglyceride concentrations while increasing HDL cholesterol levels. In this
study, the tested supplements were not associated with adverse changes in the
measured biochemical variables or physicochemical characteristics of milk and
were associated with a more favourable serum lipid profile.
Ključne riječi
Stevia rebaudiana; Hippophae rhamnoides; Phytogenic additives; Dairy cows; Serum biochemistry
Hrčak ID:
351427
URI
Datum izdavanja:
28.9.2026.
Posjeta: 0 *