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Out of 6 conservative flocks (Khaki Campbell – Kh1, Orpington – O1, Miniducks – K2,Polish Pekin – P33, Pekin originated from Danish – P8 and cross-breeds in Pekin type – SB)60 female ducks were used for comparison (10 ducks in each group). Birds wereslaughtered at 7 week of age. The investigation of breast muscles covers: determination of the colour parameters L*(lightness), a* (redness), b* (yellowness), C (saturation), ho (hue) and ΔE (colour difference),total haem pigments’ content (THP) including myoglobin (Mb), oxymyoglobin (MbO2)and metmyoglobin (MMb) content. Sensory evaluation of raw muscles’ colour intensity in10 point scale and Principal Component Analysis (PCA) of all measured parameters werealso performed. Low THP and MbO2 were shown by Kh1 and P33 (THP: 3.79 and 3.74 mg/g, MbO2: 2.32and 2.46 mg/g respectively). They were also characterized by the highest L* value of theall flocks (45.27 and 44.25 respectively) (P≤0.01, P≤0.05). The Kh1 was evaluated by the sensory panel as the lightest (5.01 conventional units[CU]) (P≤0.01). However P8 and K2 were assessed as darker than Kh1 and P33 (6.12 and6.22 CU vs. 5.01 and 5.71 CU) (P≤0.01, P≤0.05) and also had significantly higher pigmentscontent (4.48 and 4.57 mg/g respectively) (P≤0.01). Additionally K2 was characterized bythe highest MMb content (0.48 mg/g) (P≤0.01), but this value is below the level thatmakes the colour undesirable. The ΔE values between flocks were in the 1.02–2.86 range.With just few exceptions, flocks with ΔE value higher than 2, differed significantly inpigments content, L* parameter, and sensory panel scores. As regards the obtainedresults Kh1 and P33 appeared significantly lighter than P8 and K2. Kh1 and P33 had lowerpigments content, higher L* value and were assessed by a sensory panel as having lowercolour intensity than P8 and K2. PCA analysis confirmed ANOVA results and also indicatedlarge total colour variation of the samples within breeds except of O1 muscles

Characteristic of meat colour of different duck populations