. 2019 Sep 27;97(11):4647–4656. doi: 10.1093/jas/skz304

Table 4.

Body weight (BW), body condition score (BCS), and milk production of cows fed stearic acid (SA) and oleic acid (OA) dietary treatments in low and high rumen-active unsaturated fatty acids (RUFA) experiments

Items	LRUFA experiment¹						HRUFA experiment¹
	Treatment²		SEM	P-value			Treatment²		SEM	P-value
	SA	OA		Trt	Wk	Trt × Wk	SA	OA		Trt	Wk	Trt × Wk
BW, kg	693	689	13.5	0.82	0.15	0.30	726	682	13.8	<0.001	0.54	0.70
BW gain, kg/d	0.9	0.7	0.43	0.69	0.22	0.42	0.5	−0.1	0.24	0.07	0.67	0.73
BCS	2.69	2.66	0.04	0.59	0.04	0.84	2.59	2.63	0.06	0.35	0.13	0.83
BCS change	−0.004	−0.002	0.001	0.43	0.92	0.88	−0.004	−0.001	0.01	0.82	0.02	0.6
Milk yield, kg/d	50.6	48.8	1.3	0.2	<0.01	0.93	54.4	55.2	1.11	0.58	<0.001	0.84
ECM, kg/d³	51.8	48.0	0.8	<0.01	0.02	0.90	51.6	52.1	0.93	0.69	<0.01	0.87
Milk fat, %	3.7	3.4	0.08	<0.01	<0.01	0.98	3.1	3.2	0.1	0.74	<0.001	0.48
Milk fat yield, kg/d	1.9	1.7	0.03	<0.01	0.01	0.96	1.7	1.7	0.05	0.65	0.61	0.64
Milk protein, %	2.9	2.9	0.05	0.5	<0.01	0.30	2.9	2.8	0.03	<0.001	<0.001	0.24
Milk protein yield, kg/d	1.5	1.4	0.02	0.02	0.07	0.63	1.6	1.5	0.02	0.52	<0.001	0.82
Milk lactose, %	5.0	4.9	0.04	0.07	0.77	0.83	4.8	4.8	0.03	0.67	0.1	0.36
Milk lactose yield, kg/d	2.5	2.4	0.06	0.09	<0.01	0.78	2.6	2.7	0.06	0.56	<0.001	0.87
Milk SNF, %⁴	8.8	8.7	0.08	0.10	0.01	0.44	8.7	8.6	0.06	0.15	0.01	0.49
Milk SNF yield, kg/d	4.5	4.2	0.09	0.05	0.05	0.7	4.7	4.7	0.09	0.96	<0.001	0.7
MUN, mg/dL	15.0	14.1	0.7	0.17	0.59	0.5	13.4	13.7	0.35	0.51	<0.001	0.67
ECM/DMI	1.8	1.8	0.05	0.18	0.47	0.44	1.8	1.9	0.03	0.01	<0.001	0.83
NE_l balance, Mcal/d	−3.0	−3.9	0.70	0.31	<0.01	0.99	7.2	4.7	0.71	0.01	<0.001	0.72

¹LRUFA represents the diets contain low content of RUFA; HAUFA represents the diets contain high content of RUFA.

²SA dietary treatment contained approximately 0.4% more C18:0 than OA dietary treatment on DM basis; OA dietary treatment contained approximately 0.3% more C18:1 cis-9 than SA dietary treatment on DM basis.

³Energy-corrected milk = [(0.327 × kg of milk) + (12.95 × kg of milk fat) + (7.2 × kg of milk protein)].

⁴Solids nonfat.