Influence of collection interval, abstraction volume and seasonality on milk quality in the region of Lavras, MG

Carvalho, Fernanda Paul de; Bruhn, Fabio Raphael Pascoti; Faria, Peter Bitencourt

doi:10.1590/1809-6891v25e-78701E

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Veterinary Medicine / Research article • Ciênc. anim. bras. 25 • 2024 • https://doi.org/10.1590/1809-6891v25e-78701E copy

Influence of collection interval, abstraction volume and seasonality on milk quality in the region of Lavras, MG

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

The objective of this study was to determine the influence of production volume, collection interval and time of year on the composition and quality of refrigerated raw milk in the region of Lavras, MG. This study collected information from milk quality monitoring performed by dairies as required by the Federal Inspection Service (SIF). For this study, the farms were classified by milk production per farm (G): 0-200 L/day, 201-500 L/day, 501-1000 L/day, 1001-2000 L/day, and greater than 2000 L/day. The collection intervals were 24 and 48 hours (C), and seasonality (S) was treated as a function of the months of the year (November 2020 to October 2021). The following milk characteristics parameters were analyzed: fat, protein, lactose, total solids (TS), defatted dry extract (DDE), somatic cell count (SCC), urea nitrogen content (UNC), standard plate count (SPC), fat/protein ratio (F/P) and cryoscopic index. There was a seasonality influence for all the parameters studied except for UNC. The production volume per group influenced UNC, TS and SPC. Differences in UNC, protein, lactose, TS, DDE and SPC were associated with the collection interval. There was an interaction effect between seasonality and production volume (SxG) for the parameters SCC, fat and F/P. The findings of this study revealed that the supplier production volume, collection interval, and time of year contribute to variations in chemical composition and milk quality parameters.

Keywords:
Milk quality; production; composition

Parameters				Milk production (L)
Parameters		< 200	201 to 500	501 to 1000	1001 to 2000	> 2000
Milk collected by dairy farmer (L)	Mean	144	323	675	1437	2535
Milk collected by dairy farmer (L)	Minimum	80	205	505	1070	2010
	Maximum	200	500	990	1938	3829
Storage capacity per dairy farmer (L)	Mean	590	904	1471	2548	3450
	Minimum	300	400	700	1500	3000
	Maximum	1600	1900	3000	4600	4500
Number of dairy farmers per municipality	Lavras	6	8	2	2	-
	Itumirim	12	14	9	3	1
	Ijaci	-	-	1	-	-
	Itutinga	3	10	6	1	-
	Ingai	2	6	7	4	1
	Luminarias	1	6	-	-	-
	Carrancas	2	1	2	1	-
	Bom Sucesso	-	2	6	7	2
	Nazareno	-	5	4	1	-
	Conceição da Barra de Minas	-	2	1	-	-
	São Tiago	-	-	2	1	-
Total number of dairy farmers		26	54	40	20	4
Number of farmers per collection interval	24 h	21	38	19	9	1
Number of farmers per collection interval	48 h	5	16	21	11	3
Volume of milk production per group (L)		3,735	17,447	27,004	28,748	10,139
Indices (%)
Dairy farmers by category	%	18.06	37.50	27.78	13.89	2.78
Volume of milk production	%	4.29	20.04	31.01	33.02	11.64
Farmers who collect every 24 hours	%	23.86	43.18	21.59	10.23	1.14
Farmers who collect every 48 hours	%	8.93	28.57	37.50	19.64	5.36
Milk collected every 24 hours	%	6.82	26.88	28.58	29.05	8.67
Milk collected every 48 hours	%	1.68	12.98	33.52	37.11	14.71

	Collection interval (C)					P value
Parameters	24 h	48 h	Means ±SEM	Seasonality (S)^* * 12 months (November 2020 to October 2021).	Milk Production (G)^ Production volume: 200 L; from 201 to 500 L; from 501 to 1000 L; from 1001 to 2000 L and greater than 2000 L. SCC, somatic cell count; SPC, standard plate count; DDE, - defatted dry extract.	Collection interval (C)	SxG	SxC
Cryoscopic index (°h)	538.60±0.17	539.37±0.20	538.87±0.13	<0.001	0.164	0.293	0.518	0.266
Urea nitrogen content (mg/dL)	13.02±0.09	13.85±0.11	13.31±0.07	0.056	0.004	0.024	0.562	0.570
Fat (%)	3.73±0.01	3.79±0.01	3.75±0.01	<0.001	0.080	0.115	0.038	0.429
Protein (%)	3.23±0.01	3.27±0.01	3.24±0.004	<0.001	0.087	0.005	0.343	0.701
Ratio Fat/Protein (F/P)	1.15±0.00	1.16±0.00	1.16±0.002	<0.001	0.241	0.994	0.001	0.639
Lactose (%)	4.46±0.00	4.49±0.01	4.47±0.003	<0.001	0.100	0.015	0.684	0.436
Total Solids (%)	12.35±0.02	12.47±0.02	12.40±0.01	<0.001	0.034	0.007	0.357	0.297
DDE (%)	8.63±0.01	8.69±0.01	8.65±0.01	<0.001	0.068	0.002	0.538	0.370
SPC (CFU/ml)	93.01±10.60	64.74±8.87	83.19±7.54	0.024	0.029	0.017	0.980	0.485
SCC (cell/ml)	536.41 ±13.22	525.67±18.31	532.84+10.72	<0.001	0.130	0.070	0.023	0.721
				P Value	-SxG
Parameters	2020				2021
	Nov	Dez	Jan	Fev Mar	Abr Mai	Jun Jul	Ago Set	Out
SCC (cell/ml)	0.150	0.09	0.606	0.040 0.456	0.044 <0.001	0.126 0.001	0.08 0.004	0.126
Fat (%)	0.027	0.260	0.200	0.287 0.228	0.221 0.821	0.176 0.083	0.042 0.045	0.078
F/P	0.084	0.900	0.026	0.044 0.409	0.636 0.934	0.640 0.136	0.096 0.254	0.165

Universidade Federal de Goiás Universidade Federal de Goiás, Escola de Veterinária e Zootecnia, Campus II, Caixa Postal 131, CEP: 74001-970, Tel.: (55 62) 3521-1568, Fax: (55 62) 3521-1566 - Goiânia - GO - Brazil
E-mail: revistacab@gmail.com

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[1] *corresponding author: peter@ufla.br