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

Table 4

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

	GTMR		GCHD		GTMR+P		SEM	value
	M1	M3	M1	M3	M1	M3
FA (g/100 g of fat)
C6 : 0	1.67	1.38	1.38	1.26	1.43	1.34	0.30	ns	0.04	ns
C8 : 0	1.48	1.24	1.04	1.07	1.08	1.16	0.20	ns	ns	ns
C10 : 0	3.81^Aa	3.34^Aa	2.31^Ba	2.95^Ab	2.52^Aa	3.0^Aa	0.40	ns	ns	0.03
C11 : 0	0.30^Aa	0.32^Aa	0.14^Ba	0.32^Ab	0.16^Ba	0.26^Ab	0.03	ns	<0.001	<0.001
C12 : 0	3.93^Aa	3.77^Aa	2.32^Ba	3.49^Ab	2.65^Ba	3.36^Ab	0.30	ns	<0.001	0.008
C12 : 1 cis	0.05	0.07	0.03	0.06	0.03	0.07	0.04	ns	<0.001	ns
C13 : 0	0.17^A	0.20^A	0.10^B	0.26^A	0.12^AB	0.18^A	0.02	ns	<0.001	<0.001
C14 : 0	11.16	12.6	9.12	12.7	9.83	12.68	0.80	ns	<0.001	0.09
C14 : 1 cis	0.51	0.84	0.39	0.89	0.43	0.82	0.10	ns	<0.001	ns
C15 : 0	1.63^Aa	2.22^Ab	1.38^Aa	2.60^Ab	1.57^Aa	2.16^Ab	0.10	ns	<0.001	<0.01
C16 : 0	26	34.87	28.04	37.17	27.24	34.8	1.20	ns	<0.001	ns
C16 : 1 cis	0.65	1.26	1.42	1.67	1.2	1.38	0.10	0.03	0.001	ns
C16 : 1 trans	0.08	0.07	0.13	0.11	0.13	0.11	0.01	0.07	<0.001	ns
C17 : 0	1.46	1.66	1.27	1.47	1.42	1.5	0.10	ns	<0.01	ns
C17 : 1 cis	0.11	0.16	0.22	0.23	0.18	0.19	0.02	0.04	ns	ns
C18 : 0	12.5^Aa	9.43^Ab	13.86^Aa	7.43^Ab	14.6^Aa	9.62^Ab	1.00	ns	<0.001	0.02
C18 : 1 cis	24.0^Aa	21.8^Aa	29.43^Aa	22.15^Ab	26.2^Aa	21.4^Ab	1.80	ns	<0.001	0.05
C18 : 1 trans	4.45	1.39	3.47	1.59	4.58	2.55	0.40	ns	<0.001	ns
C18 : 2 cis (n-6)	3.49^Aa	1.33^Ab	2.01^Ba	1.55^Ab	1.84^Ba	1.29^Ab	0.20	0.08	<0.001	<0.001
C18:2 trans	0.34^Aa	0.34^Aa	0.49^Ba	0.34^Ab	0.59^Ca	0.42^Ab	0.04	0.07	<0.001	<0.001
C18 : 2 CLA	0.78^Aa	0.57^Ab	0.80^Aa	0.29^Ab	1.10^Aa	0.76^Bb	0.10	0.05	<0.001	0.02
C18 : 3 (n-3)	0.23^Aa	0.15^ABb	0.37^Aa	0.13^Bb	0.37^Aa	0.25^Ab	0.04	ns	<0.001	<0.001
C20 : 0	0.1	0.09	0.11	0.09	0.12	0.11	0.02	ns	0.04	ns
C20 : 1 cis	0.05	0.04	0.05	0.04	0.05	0.04	0.01	ns	0.04	ns
C20 : 1 trans	0.05	0.07	0.05	0.07	0.06	0.08	0.01	ns	<0.001	ns
C20 : 3 cis	0.07^Aa	0.05^Ab	0.04^Ba	0.05^Ab	0.05^Ba	0.05^Aa	0.01	ns	ns	<0.001
C20 : 4 (n-6)	0.18	0.17	0.08	0.09	0.1	0.11	0.02	ns	ns	ns
C22 : 0	0.11	0.09	0.04	0.03	0.07	0.06	0.02	ns	0.02	ns

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; SEM: standard error of the mean.