Table 13.

Effect of zinc methionine complex in combination with zilpaterol hydrochloride on concentrations (mg/g muscle tissue) and percentages (g/100 g total fatty acids) of individual polar lipid fatty acids (FA) and FA categories (saturated fatty acids (SFA), monounsaturated (MUFA), and polyunsaturated fatty acids (PUFA)) of neutral and polar lipid fractions (LF) from semimembranosus tissue

FA	mg/g muscle tissue				%, g/100 g total FA
	CONa	ZnMetb	SEMc	P value	CONa	ZnMetb	SEMc	P value
Total FA	1.913	2.212	0.197	0.292
SFA	0.752	0.909	0.084	0.197	41.523	40.829	1.207	0.678
14:0	0.041	0.051	0.007	0.318	2.271	2.278	0.206	0.980
15:0	0.016	0.017	0.001	0.280	0.791	0.821	0.043	0.619
16:0	0.413	0.482	0.053	0.369	21.421	21.393	0.577	0.972
17:0	0.011	0.013	0.002	0.678	0.630	0.568	0.065	0.498
18:0	0.280	0.336	0.028	0.172	15.873	15.163	0.826	0.536
23:0	0.014	0.011	0.001	0.255	0.758	0.691	0.137	0.727
MUFA	0.576	0.544	0.057	0.701	32.358	32.791	2.079	0.880
14:1	0.020	0.023	0.002	0.361	1.119	1.186	0.074	0.513
16:1	0.039	0.047	0.007	0.431	2.190	2.074	0.172	0.625
17:1	0.015	0.018	0.002	0.427	0.865	0.790	0.049	0.272
18:1 trans	0.055	0.071	0.009	0.194	3.038	3.282	0.248	0.480
18:1 cis-9	0.429	0.429	0.047	0.997	24.198	24.644	1.662	0.846
20:1	0.019	0.020	0.001	0.625	1.058	1.064	0.163	0.979
PUFA	0.525	0.567	0.040	0.467	26.119	26.378	2.333	0.936
18:2 n-6	0.287	0.322	0.023	0.304	14.366	14.961	1.267	0.734
18:3 n-3	0.008b	0.009a	<0.001	0.014	0.373	0.395	0.033	0.630
20:3 n-6	0.040	0.043	0.003	0.581	2.008	1.994	0.204	0.958
20:4 n-6	0.191	0.195	0.014	0.836	9.426	9.146	0.895	0.821

Means in the same row having different letters are significant at P ≤ 0.05 due to ZnMet/CON × LF interaction

^aCON: Control 90 ppm Zn added from ZnSO₄ (n = 20 steers)

^bZnMet: Control plus 720 mg Zn added from ZINPRO^® zinc methionine (n = 20 steers)

^cPooled standard error of the mean