Analysis of quality and antibiotic residues in raw milk marketed informally in the Province of Pichincha – Ecuador

Figures & data

Table 1. Minimum, maximum and average values and their compliance in relation to NTE INEN 9: total results.

Parameter	Requirement NTE INEN 9	Minimum Value	Maximum Value	Media	P value between samples	P value between cantons	Complies	Does not comply
Relative density (g/ml)	1.028–1033	1.015	1.040	1.030	0.4132	0.06259	507/650	143/650
							78.00%	22.00%
Titratable acidity (° D)	13–17	12	20.29	55	0.02221*	0.00029 *	177/650	473/650
							27.23%	72.77%
Fat (%)	Min. 3.2	0.75	16.94	4.39	0.00157*	6.28e-06 *	569650	81/650
							87.54%	12.46%
Crude protein (%)	Min. 2.9	1.33	4.88	3.19	0.3202	0.5803	554/650	96/650
							85.23%	14.77%
Total Solids (%)	Min. 11.2	4.72	12.94	25.86	0.000817*	1.49e-05*	588/650	62/650
							90.46%	9.54%
Non-fat solids (%)	Min. 8.2	4.64	8.56		0.07034	0.03113	548/650	102/650
							80.31%	15.69%
Lactose (%)	4.8–5.5	2.650	8.72	4.60	2.26e-05*	0.0051*	477/650	173/650
							73.38%	26.62%
Somatic cells (CS/ml)	Max. 700000	4000	10235000	581900	0.06941	0.00026*	502/650	148/650
							77.23%	22.77%
TOTAL:							37/650	613/650
							5.69%	94.31%

Figure 1. Boxplot of density, acidity and somatic cell count, evaluated between cantons.

Figure 2. Boxplot of density, acidity and somatic cell count, evaluated between cantons.

Figure 3. Boxplot of fat, protein, lactose, total solids and solids-non-fat, evaluated between samples.

Figure 4. Boxplot of fat, protein, lactose, total solids and solids-non-fat, evaluated between samples.

Table 2. Positive results by antibiotic family.

Antibiotic	Positive samples	Percentage
Gentamicin	1/185	0.54%
Streptomycin	7/185	3.79%
Betalactams	6/185	3.24%
Tetracyclines	8/185	4.32%
Neomycin	17/185	9.19%
Sulfonamides	152/185	82.16%