Relationship between the content of chlorinated hydrocarbons and fatty acid composition of milk fat

Chlorinated hydrocarbons	Cow milk			Mare milk
Chlorinated hydrocarbons	Mean	±SD	Range	Mean	±SD	Range
γ-HCH	0.46	±0.32 b	(0.13–1.05)	4.61	±1.16 a	(2.9–6.62)
DDE	4.65	±1.65 a	(2.96–7.92)	3.90	±2.6 a	(1.52–10.56)
DDD	BDL	±ND	(BDL)	0.21	±0.25	(BDL–0.62)
DDT	4.56	±3.06 b	(0.27–10.31)	11.06	±1.57 a	(8.23–13.15)
ΣDDT	9.20	±4.06 b	(3.47–15.69)	15.17	±3.2 a	(10.71–22.24)

[i] a, b – mean values in rows with different letters differ significantly at P < 0.05; BDL – below detection level; ND – not determined; SD – standard deviation

Table 2

Percentage contribution of fatty acids of cow and mare milk fat (%)

Fatty acid	Cow milk			Mare milk
Fatty acid	Mean	±SD	Range	Mean	± SD	Range
C4:0	3.27	±0.28 a	(2.78–3.76)	0.17	±0.07 b	(0.05–0.28)
C6:0	2.22	±0.20 a	(1.81–2.43)	0.31	±0.26 b	(0.01–1.02)
C8:0	1.41	±0.14 b	(1.16–1.59)	2.84	±1.51 a	(0.05–5.45)
C10:0	3.21	±0.45 b	(2.49–3.82)	7.09	±3.05 a	(1.79–13.69)
C11:0	0.05	±0.02 a	(0.03–0.08)	0.02	±0.03 b	(0.00–0.09)
C12:0	3.57	±0.51 b	(2.73–4.25)	6.1	±2.46 a	(2.13–10.42)
C13:0 iso	0.07	±0.02 a	(0.05–0.09)	0.07	±0.10 a	(0.0–0.35)
C13:0	0.20	±0.03 a	(0.14–0.24)	0.11	±0.08 b	(0.02–0.33)
C14:0 iso	0.21	±0.07 a	(0.07–0.28)	0.05	±0.03 b	(0.03–0.17)
C14:0	11.01	±1.49 a	(8.16–12.83)	6.60	±1.79 b	(4.02–9.36)
C15:0 iso	0.43	±0.15 a	(0.18–0.58)	0.06	±0.05 b	(0.0–0.20)
C15:0 aiso	0.76	±0.31 a	(0.27–1.12)	0.08	±0.09 b	(0.0–0.36)
C15:0	1.45	±0.46 a	(0.81–1.94)	0.26	±0.16 b	(0.0–0.74)
C16:0 iso	0.40	±0.11 a	(0.22–0.53)	0.13	±0.04 b	(0.0–0.23)
C16:0	26.22	±2.91 a	(22.63–31.15)	22.3	±1.69 b	(20.0–26.75)
C17:0	0.88	±0.07 a	(0.79–0.98)	0.31	±0.15 b	(0.2–0.83)
C18:0	11.41	±1.88 a	(9.13–14.95)	1.94	±0.48 b	(0.75–2.46)
C20:0	0.18	±0.07 a	(0.03–0.31)	0.08	±0.04 b	(0.01–0.21)
C10:1	0.26	±0.04 b	(0.16–0.32)	0.78	±0.65 a	(0.05–2.54)
C12:1	0.07	±0.03 a	(0.02–0.12)	0.03	±0.03 b	(0.0–0.10)
C14:1	0.81	±0.12 a	(0.61–1.01)	0.30	±0.21 b	(0.0–0.92)
C16:1	1.46	±0.5 b	(0.75–2.22)	5.11	±1.51 a	(2.76–8.14)
C17:1	0.30	±0.10 a	(0.18–0.5)	0.35	±0.13 a	(0.16–0.61)
C18:1 cis 9	19.61	±3.34 b	(15.30–25.24)	22.46	±4.57 a	(14.51–30.0)
C18:1 cis 11	1.27	±2.29 a	(0.45–8.51)	1.69	±0.44 a	(1.0–2.39)
C18:1 cis 12	0.14	±0.04	(0.1–0.26)	0.0	±0.0	(ND)
C18:1 cis 13	0.11	±0.06 a	(0.05–0.23)	0.18	±0.26 a	(0.01–1.07)
C18:1 trans6	0.15	±0.09 a	(0.00–0.28)	0.01	±0.01 b	(0.0–0.04)
C18:1 trans9	0.28	±0.04 a	(0.20–0.33)	0.05	±0.02 b	(0.02–0.12)
C18:1 trans10+trans11	3.55	±1.59 a	(0.87–5.63)	0.27	±0.44 b	(0.0–1.57)
C18:1 trans12	0.21	±0.04 a	(0.16–0.27)	0.01	±0.01 b	(0.0–0.03)
C18:1 trans16	0.32	±0.07 a	(0.23–0.45)	0.02	±0.09 b	(0.0–0.43)
C20:1	0.13	±0.03 b	(0.09–0.19)	0.39	±0.20 a	(0.01–0.94)
C18:2 cis9cis12	1.31	±0.17 b	(1.04–1.54)	11.70	±4.18 a	(3.47–19.76)
C18:2 trans13cis9	0.19	±0.06 a	(0.14–0.32)	0.01	±0.02 b	(0.0–0.08)
C18:2 trans12cis9	0.25	±0.07 a	(0.17–0.41)	0.04	±0.04 b	(0.0–0.14)
C18:2 trans9cis12	0.07	±0.03 a	(0.03–0.12)	0.01	±0.02 b	(0.0–0.08)
C18:2 trans11cis15	0.54	±0.27 a	(0.12–0.95)	0.01	±0.02 b	(0.0–0.6)
C18:2 cis9trans11 CLA	1.18	±0.69 a	(0.41–2.51)	0.02	±0.02 b	(0.0–0.05)
C18:3	0.85	±0.10 b	(0.73–1.05)	8.11	±3.43 a	(1.5–13.3)
ΣSFA	66.93	±4.85 a	(58.39–71.65)	48.51	±8.97 b	(35.96–66.56)
ΣMUFA	28.65	±4.63 a	(23.97–38.30)	31.65	±5.58 a	(22.86–41.31)
ΣPUFA	4.42	±1.08 b	(3.22–6.45)	19.90	±6.27 a	(8.05–28.05)

[i] a, b – mean values in rows with different letters differ significantly at P < 0.05; ND – not determined; SD – standard deviation

Table 3

Correlation between chlorinated hydrocarbons content and fatty acid composition in cow and mare milk fat

Fatty acid	Cow milk				Mare milk
Fatty acid	γ-HCH	DDE	DDT	Σ DDT	γ-HCH	DDE	DDD	DDT	Σ DDT
C4:0	NS	−0.52∗∗	NS	NS	NS	NS	NS	NS	NS
C6:0	0.37∗	NS	NS	NS	NS	NS	NS	NS	NS
C8:0	0.43∗	NS	NS	NS	NS	NS	NS	NS	NS
C10:0	0.47∗∗	NS	0.35∗	NS	NS	NS	NS	NS	NS
C11:0	0.56∗∗∗	0.49∗∗	NS	0.34∗	NS	NS	NS	NS	NS
C12:0	0.49∗∗	NS	0.49∗∗	0.43∗	NS	NS	NS	NS	NS
C13:0 iso	NS	NS	0.36∗	NS	NS	NS	NS	NS	NS
C13:0	NS	0.59∗∗∗	NS	NS	−0.80∗∗	NS	NS	NS	NS
C14:0 iso	NS	0.71∗∗∗	NS	0.39∗∗	0.73∗	NS	NS	NS	NS
C14:0	0.46∗∗	NS	0.66∗∗∗	0.61∗∗∗	−0.72∗	NS	NS	NS	NS
C15:0 iso	NS	0.68∗∗∗	NS	0.47∗	NS	NS	NS	NS	NS
C15:0 aiso	NS	0.70∗∗∗	NS	0.48∗∗	NS	NS	NS	NS	NS
C15:0	NS	0.71∗∗∗	NS	0.51∗∗	NS	NS	NS	NS	NS
C16:0 iso	NS	0.69∗∗∗	NS	0.43∗	NS	−0.72∗	NS	NS	−0.64∗
C16:0	NS	−0.41∗	0.36∗	NS	NS	NS	NS	NS	NS
C17:0	NS	0.56∗∗∗	NS	NS	NS	NS	NS	NS	−0.64∗
C18:0	NS	0.36∗	−0.40∗	NS	NS	NS	NS	−0.69∗	NS
C20:0	NS	NS	NS	NS	NS	NS	NS	NS	NS
C10:1	NS	0.54∗∗∗	0.74∗∗∗	0.79∗∗∗	−0.67∗	NS	NS	NS	NS
C12:1	NS	0.68∗∗∗	NS	0.43∗	NS	NS	NS	NS	NS
C14:1	NS	NS	NS	NS	NS	NS	NS	NS	NS
C16:1	−0.47∗∗	−0.57∗∗∗	NS	−0.39∗	0.71∗	NS	NS	NS	NS
C17:1	−0 55∗∗∗	−0.46∗∗	−0.46∗∗	−0.54∗∗∗	0.63∗	NS	NS	NS	NS
C18:1 c9	−0.49∗∗	NS	−0.39∗	−0.43∗∗	0.64∗	NS	NS	NS	NS
C18:1 c11	NS	NS	−0.47∗∗	−0.49∗∗	0.75∗	NS	NS	NS	NS
C18:1 c12	NS	NS	−0.41∗	NS	ND	ND	ND	ND	ND
C18:1 c13	NS	−0.41∗	−0.63∗∗∗	−0.64∗∗∗	NS	NS	NS	NS	NS
C18:1 t6	NS	0.68∗∗∗	NS	0.47∗∗	NS	NS	NS	NS	NS
C18:1 t9	NS	NS	NS	NS	NS	NS	NS	NS	NS
C18:1 t10+t11	NS		NS	0.42∗	NS	NS	NS	NS	NS
C18:1 t12	NS	0.55∗∗∗	NS	NS	NS	NS	NS	NS	NS
C18:1 t16	0.36∗	0.62∗∗∗	NS	NS	NS	NS	NS	NS	NS
C20:1	NS	0.62∗∗∗	NS	0.49∗∗	NS	NS	NS	NS	NS
C18:2 c9c12	−0.39∗	−0.67∗∗∗	NS	NS	NS	0.70∗	NS	NS	0.73∗
C18:2 t13c9	NS	0.48∗∗	NS	0.36∗	NS	NS	NS	NS	NS
C18:2 t12c9	NS	NS	NS	NS	NS	NS	NS	NS	NS
C18:2 t9c12	NS	0.39∗	NS	0.41∗	NS	NS	NS	0.87∗∗∗	NS
C18:2 t11c15	NS	0.64∗∗∗	NS	0.42∗	NS	0.65∗	NS	NS	NS
C18:2 c9t11	NS	0.47∗∗	0.36∗	0.47∗∗	NS	NS	NS	NS	NS
C18:3	NS	NS	NS	NS	NS	−0.77∗∗	NS	NS	−0.81∗∗
ΣSFA	0.55∗∗∗	NS	0.39∗	0.36∗	NS	NS	NS	NS	NS
ΣMUFA	−0.52∗∗	NS	−0.48∗∗	−0.46∗∗	0.67∗	NS	NS	NS	NS
ΣPUFA	NS	0.41∗	NS	0.42∗	NS	NS	NS	NS	NS

NS – not significant

∗∗ correlation significant at P < 0.01