Milk Fatty Acid Profile of Holstein Cows When Changed from a Mixed System to a Confinement System or Mixed System with Overnight Grazing

Table 3

Effect of treatment (), month (), and interaction between treatment and month () on fatty acid profile (FAP) in month 1 (M1) and month 3 (M3) of lactation.

	GTMR		GCHD		GTMR+P		SEM	value
	M1	M3	M1	M3	M1	M3
FA saturation (g/100 g of fat)
SFA	64.84	71.57	61.01	70.70	63.01	70.40	1.67	ns	<0.001	ns
MUFA	30.01	25.82	35.18	26.83	32.90	26.71	1.54	ns	<0.001	ns
PUFA	5.10^Aa	2.60^Ab	3.80^Aa	2.46^Ab	4.07^Aa	2.87^Ab	0.35	ns	<0.001	<0.001
n-3	0.31^Aa	0.19^ABa	0.41^Aa	0.18^Ab	0.43^Aa	0.30^Ba	0.04	ns	<0.001	0.01
n-6	3.66^Aa	1.48^Ab	2.09^Ba	1.64^Ab	1.94^Ba	1.39^Ab	0.19	ns	<0.001	<0.001
n6/n3	12.30^Aa	8.52^Ab	5.02^Ba	8.95^Ab	4.47^Ba	4.72^Ba	0.37	<0.01	ns	<0.001
Trans	4.93	1.87	4.14	2.12	5.37	3.16	0.50	ns	<0.001	ns
FA origin (g/100 g of fat)
De novo	24.72^Aa	25.98^Aa	18.23^Aa	25.64^Ab	19.84^Aa	25.0^Ab	1.90	ns	<0.001	0.02
(C4 : 0-C15 : 1)
Mixed origin	26.73	36.2	29.59	38.95	28.58	36.3	1.20	ns	<0.001	ns
(C16 : 0+C16 : 1)
Preformed	48.07	37.45	52.31	35.58	51.43	38.49	2.60	ns	<0.001	0.08
(>C17 : 0)

Treatments: GTMR: cows fed TMR; GCHD: cows diet change; GTMR+P: cows TMR+pasture. When there was significant interaction between treatment and month: differences between treatments in the same month (different capital letters) and difference between months within each treatment (different small letters) indicate were shown. ns: no significance; SFA: saturated; MUFA: monounsaturated; PUFA: polyunsaturated; SEM: standard error of the mean.