Reimplant strategies improve rate of weight gain in growing beef steers and heifers fed in confinement for slaughter for at least 200 days

IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Applied Animal Science Pub Date : 2023-12-01 DOI:10.15232/aas.2023-02449

Jase J. Ball , PAS, Patrick C. Taube , John W. Hallberg , Lilian Franz , Jezaniah Kira Tena , Angela N. Nadrasik , Nicole L. Eberhart , Shelby L. Jones , Karmella D. Borchers , Jordan A. Scramlin , David T. Bechtol , Audie R. Waite , Matthew D. Edmonds , Ryan T. Herrick , PAS, Kelly F. Lechtenberg , Ty E. Lawrence , PAS

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Abstract

Objective

Our objective was to evaluate growth performance of feedlot steers and heifers administered a sham terminal implant or Synovex Choice, Synovex Plus, or Synovex ONE Feedlot terminal implant 60 or 120 d after initial implantation with Synovex Choice.

Materials and Methods

Two studies (steer and heifer) were conducted across 4 locations using 2,400 crossbred steers (n = 1,200; BW = 300.5 ± 31.1 kg) and heifers (n = 1,200; BW = 296.5 ± 27.5 kg). Within sex, cattle were blocked by BW and pen and randomized to 1 of 4 treatments: (1) Choice-Sham, initial implant of Synovex Choice (Zoetis Inc., Parsippany, NJ; 100 mg of trenbolone acetate [TBA] and 14 mg of estradiol benzoate [EB]) fol- lowed by terminal reimplantation of an empty needle; (2) Choice-Choice, initial implant of Synovex Choice followed by terminal reimplantation with Synovex Choice; (3) Choice-Plus, initial implant of Synovex Choice followed by terminal reimplantation with Synovex Plus (Zoetis Inc.; 200 mg of TBA and 28 mg of EB); and (4) Choice-One, initial implant of Synovex Choice followed by terminal reimplantation with Synovex ONE Feedlot (Zoetis Inc.; 200 mg of TBA and 28 mg of EB). Within sex, each site was assigned randomly to reimplant on either d 60 or 120. Data were pooled across reimplant interval by sex. Within sex, animal was the experimental unit and treatments were commingled within pen (n = 3 or 4 pens per site per sex). Body weights were recorded on d 0 and 200.

Results and Discussion

Overall ADG from d 0 to 200 was greater for steers (P < 0.01) and heifers (P ≤ 0.02) in the Choice-Choice, Choice-Plus, and Choice-One treatments compared with Choice-Sham, with no differences (P ≥ 0.15) between reimplant treatments. Minimal differences were noted in implant site retention and reaction rates between treatments within sex. There were no differences (steers, P = 0.67; heifers, P = 0.51) between treatments for the percentage of deads and removals nor the incidence of bullers (P = 0.80).

Implications and Applications

Synovex Choice as an initial implant followed by terminal implantation with Synovex Choice, Synovex Plus, or Synovex ONE Feedlot 60 to 120 d later improves ADG in feedlot steers and heifers for at least 200 d.

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再植入策略提高生长中的肉牛和小母牛的增重率，饲养至少200天用于屠宰

本研究的目的是评估在首次植入Synovex Choice后60天或120天，饲喂假末端植入物或Synovex Choice、Synovex Plus或Synovex ONE的饲养场阉牛和小母牛的生长性能。材料和方法在4个地点进行了两项研究(阉牛和小母牛)，使用了2400头杂交阉牛(n = 1200;体重= 300.5±31.1 kg)和小母牛(n = 1200;体重= 296.5±27.5 kg)。在性别范围内，牛被BW和围栏阻断，并随机分为4种处理中的1种:(1)Choice- sham，初始植入Synovex Choice (Zoetis Inc.， Parsippany, NJ);100 mg醋酸trenbolone [TBA]和14 mg苯甲酸雌二醇[EB])，最后再插入空针;(2) Choice-Choice，首次种植Synovex Choice，末梢再种植Synovex Choice;(3) Choice-Plus，首次植入Synovex Choice，最后再植入Synovex Plus (Zoetis Inc.);TBA 200毫克，EB 28毫克);(4) Choice- ONE，首次植入Synovex Choice，最后再植入Synovex ONE Feedlot (Zoetis Inc.);200毫克TBA和28毫克EB)。在性别范围内，每个部位随机分配在第60天或第120天重新植入。数据按性别汇总。在性别范围内，以动物为实验单位，在围栏内混合处理(每个性别每个地点n = 3或4个围栏)。于第0、200天分别记录体重。结果和讨论从第0天到第200天，公牛的总体平均日增重更大(P <与Choice-Sham相比，Choice-Choice、Choice-Plus和Choice-One处理的肥育率(P≤0.02)和肥育率(P≤0.02)，再种植处理之间无差异(P≥0.15)。在不同性别的治疗中，植体部位保留和反应率的差异很小。两组间无差异(对照组，P = 0.67;小母牛，P = 0.51)，处理之间的死亡和切除百分比和破体发生率(P = 0.80)。影响和应用最初使用Synovex Choice，然后在60 - 120 d后再使用Synovex Choice、Synovex Plus或Synovex ONE，可使饲养场阉牛和小母牛的平均日增重提高至少200 d。

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