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Processability of milk in the production of curd cheeses on family farms in the summer and winter seasons
The aim of the study was to compare quality of curd cheeses produced from raw and pasteurized milk in a family farm in the summer and winter seasons. Conducted analyses showed that the season of the year, in which milk was produced, influenced its chemical composition and selected quality attributes. In terms of milk processability a more advantageous composition and better quality attributes were found in winter compared to summer. Quality of produced curd cheeses was affected by the season of milk production as well as milk type (raw vs. pasteurized). In the winter season the yield of curd cheese was over 1.5-fold greater from pasteurized milk in comparison to the summer season. Curd cheeses produced from raw milk were firmer, more elastic and sliceable, while those produced from pasteurized milk were less cohesive and more suitable was spreads. The organoleptic analysis of curd cheeses showed that more advantageous consumer value was found for cheeses produced in the winter season.
Effect of herbal feed additives on goat milk volatile flavor compounds
The aim of this study is to investigate the effects of herbal supplements administered to goats on sensory quality and volatile flavor compounds in their milk. The experiment was conducted on sixty Polish white improved goats randomly allocated into five feeding groups (four experimental and one control) of twelve goats each. The trial lasted 12 weeks. The experimental animals received supplements containing a mixture of seven or nine different species of herbs at 20 or 40 g/animal/day. The control group received feed without any herbal supplements. Milk obtained from experimental and control groups of animals was characterized by a low content of aroma compounds, with only 11 chemical compounds being identified. Decanoic methyl ester, methylo 2-heptanone and methylo-butanoic methyl ester had the highest share in the total variability of the tested aroma compounds (PCA). During the sensory evaluation, the smell and taste of most of the samples were similar (p > 0.05). However, the addition of herbal feed supplements lowered the concentration of Caproic acid (C6:0), Caprylic acid (C8:0) and Capric acid (C10:0), which caused a significant reduction in the goaty smell of milk. The obtained results indicate that the studied herbal supplements can reduce the intensity of goaty smell and allow goat milk production without modification of other sensory features.