Influence of altitude and lactation period on composition and physical properties of milk in crossbred Sharri sheep
Laen...
Kuupäev
2023
Kättesaadav alates
Autorid
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Estonian University of Life Sciences
Abstrakt
The aim of this study was to compare the changes in chemical composition and
physical properties of raw milk from crossbred ‘Sharri’ sheep as a function of altitude
(1,200 m - variant A and 1,600 m - variant B) and lactation period. Milk composition (total
solids - TS, milk fat–MF, solids non-fat-SNF, protein - P, lactose - L, ash, freezing point - FP,
titratable acidity - TA, active acidity - AA, and density - D) were analysed once per month during
the period of June, July, August, and September of 2021. Sheep milk at 1,600 m altitude showed
significantly higher values (P < 0.05) for all analysed parameters and lower values for FP
compared to milk from 1,200 m altitude, except SNF, FP and AA, which were not statistically
significant. The analysed milk during the four months of lactation period has significantly
increased (P < 0.05) in TS (from 15.65 to 25.46%); MF (6.49 to 10.80%); SNF (9.16 to 14.66%);
P (4.46 to 6.94%); L (3.96 to 6.52%); ash (0.74 to 1.20%); TA (9.90 to 14.53 °SH); whereas
changes in FP value (-0.611 to -0.709 °C), AA (6.68 to 6.76) and D (1.035 to 1.053 g cm-3
), have
been statistically non-significant. The interactions between altitude*lactation period on milk
composition (TS, MF, SNF, P, L, ash) of crossbred ‘Sharri’ sheep and physical properties
(FP, TA, AA and D) were nonsignificant.
Kirjeldus
Received: March 19th, 2023 ; Accepted: May 7th, 2023 ; Published: May 22nd, 2023 ; Correspondence: alltane.kryeziu@uni-pr.edu
Märksõnad
altitude, crossbred ‘Sharri’ sheep, lactation period, milk composition, physical properties, articles