The effects of increasing supplementation of zinc-amino acid complex on growth performance, carcass characteristics, and inflammatory response of beef cattle fed ractopamine hydrochloride

Abstract Previously, we reported that supplementing a water soluble zinc via drinking water (0 to 80 mg/L) to nursery pigs improved ADG and G:F. To evaluate the efficacy of higher titrated levels of this water soluble zinc amino acid complex (ProPath®Zn LQ, Zinpro Corporation, Eden Prairie, MN) on growth performance, 280 crossbred pigs (5.5 kg BW; 19 d of age) were randomly allotted to four water treatments (7 pens/treatment; 10 pigs/pen). The water treatments were 0, 40, 80 and 160 mg Zn/L of water. Pigs were fed in 4 dietary phases with complex, nutrient-dense, corn-soybean meal-based diets: Phase 1 and 2 (2,500 and 1,750 mg Zn as ZnO/kg; d 1–7 and 7–14, respectively) and Phase 3 and 4 (200 mg Cu as CuSO4/kg; d 14–23 and 23–42, respectively). Pigs and feeders were weighed weekly to determine ADG, ADFI, and G:F. Water meters were used to record and calculate water disappearance and zinc intake. Data were analyzed as a randomized complete block design. Orthogonal polynomial contrasts were used to determine linear and curvilinear effects. Water and total zinc intake increased linearly (P < 0.001) with increasing water zinc concentration. From d 0–14 when high dietary zinc was fed, there were no differences (P > 0.10) in ADG, ADFI, or G:F. However, from d 14–42 when basal levels of zinc were fed, quadratic improvements in ADG (0.545, 0.561, 0.578, 0.546 kg; P < 0.05) and G:F (0.686, 0.706, 0.723, 0.702; P < 0.01) were observed with increasing zinc via water. Similarly for d 0–42, ADG (0.435, 0.440, 0.454; 0.434 kg; P = 0.07), G:F (0.726, 0.740, 0.763, 0.749; P = 0.05) and average ending wt (23.73, 23.97, 24.55, 23.70 kg; P = 0.07) improved quadratically with increasing zinc. In conclusion, supplementing ProPath®Zn LQ via water resulted in improvements in ADG and G:F for nursery pigs.

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291 Influence of feeding amino acid complexes of zinc and copper on growth performance and carcass response of finishing steers fed ractopamine hydrochloride

Journal of Animal Science ◽

10.1093/jas/skaa278.392 ◽

2020 ◽

Vol 98 (Supplement_4) ◽

pp. 212-213

Author(s):

Chanda Engel ◽

Gary Tibbetts ◽

Mark Branine

Keyword(s):

Amino Acid ◽

Animal Health ◽

Experimental Unit ◽

Beef Steers ◽

Individual Animal ◽

Acid Complex ◽

Amino Acid Complex ◽

Finishing Steers ◽

Ractopamine Hydrochloride ◽

Eden Prairie

Abstract A 42-d research study evaluated effects of feeding beef steers increasing levels of dietary Zn from Zn methionine (AAC-Zn; ZINPRO, Zinpro Corporation, Eden Prairie, MN) with or without supplemental Cu from Cu amino acid complex (AAC-Cu; Availa Cu, Zinpro Corp.) concurrently with ractopamine hydrochloride (RAC; Optaflexx, Elanco Animal Health, Greenfield, IN). One hundred-twenty steers (mean BW = 624 kg), ≤ 50 d from projected harvest were randomized to three pens (40 steers/pen) equipped with GrowSafe Systems (Calgary AB, Canada) feed bunk technology. Each pen was assigned to one of three treatment diets: 1) basal finishing diet + 30 mg Zn/kg DM from AAC-Zn (CON); 2) basal finishing diet + 90 mg Zn/kg DM from AAC-Zn (AAC-Zn90); or 3) AAC-Zn90 diet + 10 mg Cu/kg DM from AAC-Cu (AAC-Zn/Cu). Following allocation to treatments, cattle were acclimated to pen cohorts and GrowSafe feed bunks for 7 days. All steers were fed 300 mg RAC∙hd-1∙d-1 starting 35 d prior to harvest. Individual feed intake measurements began with RAC feeding and continued for 35 d until cattle were shipped for harvest. Carcass data were collected from each steer. Data were analyzed with individual animal as the experimental unit using PROC MIXED and PROC GLIMMIX procedures of SAS 9.4 (SAS Institute, Cary, NC). Numerically AAC-Zn90 fed cattle had heavier carcass weights than CON and AAC-Zn/Cu. Steers fed AAC-Zn90 had greater (P = 0.02) marbling scores compared to AAC-Zn/Cu. Steers fed AAC-Zn90 had lower backfat thickness (P = 0.02) and numerically greater marbling scores compared to CON. A biphasic program of feeding a lower level of AAC-Zn for the duration of the finishing phase followed by an increased rate of AAC-Zn during RAC feeding may optimize overall live and carcass response and improve total individual animal value.

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396 Effect of zinc amino acid complexes on growth performance and carcass characteristics of finishing beef steers fed with or without ractopamine hydrochloride- a nine study pooled analysis

Journal of Animal Science ◽

10.1093/jas/skz258.327 ◽

2019 ◽

Vol 97 (Supplement_3) ◽

pp. 159-159

Author(s):

Christopher Reinhardt ◽

Allison Millican ◽

Tryon Wickersham ◽

Connie Larson ◽

Mark Branine

Keyword(s):

Amino Acid ◽

Growth Performance ◽

Basal Diet ◽

Pooled Analysis ◽

Feed Ratio ◽

Experimental Unit ◽

Beef Steers ◽

Acid Complex ◽

Main Effect ◽

Ractopamine Hydrochloride

Abstract A nine-study retrospective pooled analysis was conducted to evaluate supplemental Zn provided as an amino acid complex (ZnAA) on growth performance, carcass quality and yield in finishing beef steers fed with or without ractopamine hydrochloride (RAC) prior to slaughter. Data from nine well-controlled studies conducted at university and commercial feedlot research facilities in AB, IA, KS, OK and TX were evaluated using 249 pens ranging from 6 to 275 steers /pen (Total number=14,096 animals.; initial BW = 340± 6.2 kg). Treatments evaluated were: (1) Control (CON) =basal diet with 0 to 11 mg-1·kg-1 DM ZnAA and no RAC; (2) RAC = 200 to 320 mg RAC ∙hd-1∙d-1 fed 28 to 42 d prior to slaughter; (3) ZnAA only =30 to 120 mg-1·kg-1 DM fed throughout finishing period; (4) ZnAA + RAC. Main effects of feeding RAC, ZnAA and RAC × ZnAA interaction were determined for growth performance and carcass data with pen as experimental unit and initial BW as covariate. Combined analyses indicated no RAC × ZnAA interactions (P ≥ 0.23). RAC main effect improved carcass-adjusted growth performance and increased HCW and ribeye area (P ≤ 0.01). Main effect ZnAA increased carcass-adjusted final BW, ADG, and HCW (P ≤ 0.01); improved carcass-adjusted Gain: DM feed ratio (P = 0.06), dressing percentage (P = 0.02), and increased calculated yield grade, backfat thickness and percentage of carcass internal fat (P ≤ 0.10). A RAC × ZnAA interaction (P ≤ 0.10) was observed for USDA quality and yield grade distribution of carcasses. Incidence and severity of liver abscesses were reduced (P ≤ 0.05) by feeding either ZnAA or RAC. Feeding ZnAA and RAC to finishing cattle separately or in combination were additive for producing incremental improvements in production and carcass traits of economic importance.

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