Evaluation of Growth Performance, Efficiency of Dietary Net Energy Utilization, and Carcass Trait Responses of Heavy Finishing Lambs Administered 12 mg of Zeranol Subcutaneously in the Ear 59 d before Harvest

Q4 Veterinary
Emily R. Nold, Thomas Norman, W. Rusche, Rosemarie A. Nold, Z. Smith
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Abstract

The objective of this research was to determine the influence of implanting heavy wether lambs with 12 mg of zeranol (1 pellet Ralgro, Merck Animal Health. Madison, NJ, USA) 59 d before harvest. Average daily gain (ADG), feed efficiency, and carcass merit were evaluated. Polypay and crossbred wethers (n = 32) were equally divided into two treatment groups: non-implanted; (CON) or implanted with 12 mg of zeranol (IMP) in a randomized complete block design. Sixteen pens were used, resulting in eight replicate pens per treatment. Wethers were fed a finishing diet consisting of cracked corn, soybean meal, and soybean hulls ad libitum for 59 d. Lambs had access to clean water at all times from water fountains. Lambs were weighed on d -1, 1, 14, and 59. On d 59, 16 lambs (8 lambs/treatment) were harvested in the South Dakota State University Meat Lab. Hot carcass weight (HCW), dressing percent (DP), rib fat, body wall thickness, loin eye area, boneless closely trimmed retail cut percentages, and yield grades were recorded. Final body weight (BW), cumulative ADG, and gain efficiency were greater (p ≤ 0.01) for implanted lambs by 2.9%, 25.0%, and 35.2%, respectively, while dry matter intake (DMI) was unaffected by implant treatment (p = 0.18); thus, the efficiency of dietary net energy utilization was increased for IMP (p ≤ 0.01). No appreciable differences were noted (p ≥ 0.17) between treatments for any carcass traits measured. These results indicate that zeranol improves growth performance in heavy finishing lambs without detriment to carcass quality, which implies that producers can improve profitability due to increased gains and efficiency.
采前59 d皮下注射12 mg泽兰醇对重肥育羔羊生长性能、饲粮净能利用效率和胴体性状响应的影响
本研究的目的是确定用12毫克的zeranol(1颗粒,Ralgro,默克动物保健公司)植入重阉羔羊的影响。麦迪逊,新泽西州,美国)收获前59天。评价平均日增重、饲料效率和胴体品质。多花羊和杂交羊(n = 32)平均分为两个治疗组:未植入;(CON)或在随机完全区组设计中植入12mg zeranol (IMP)。共使用16支笔,每次处理8支重复笔。饲粮由玉米、豆粕和大豆壳组成,饲喂59 d。羔羊可随时从饮水机获得干净的水。分别在第1、1、14和59天称重。第59天,在南达科他州立大学肉类实验室收获了16只羔羊(每组8只)。记录了热胴体重(HCW)、屠宰率(DP)、肋脂、体壁厚度、腰眼面积、无骨精整零售切肉百分比和产量等级。植入羔羊的末重、累积日增重和增重效率分别提高2.9%、25.0%和35.2% (p≤0.01),干物质采食量不受植入羔羊处理的影响(p = 0.18);饲粮净能量利用效率显著提高(p≤0.01)。各处理间各胴体性状无显著差异(p≥0.17)。这些结果表明,zeranol在不损害胴体质量的情况下提高了重肥育羔羊的生长性能,这意味着生产者可以通过增加增重和效率来提高盈利能力。
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来源期刊
Indian Journal of Small Ruminants
Indian Journal of Small Ruminants Veterinary-Small Animals
CiteScore
0.40
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0.00%
发文量
81
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