W.Z. Yang , P.M.T. Lima , S. Ramirez , E. Schwandt , T.A. McAllister
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Steers were fed a TMR ad libitum once daily and weighed on d 32, 59, and 110 in the growing phase but only at the beginning and the end of the finishing phase.</p></div><div><h3>Results and Discussion</h3><p>During growing, DMI did not differ, whereas final BW (trend; 415 vs. 403 kg) and ADG (numerically; 1.31 vs. 1.20 kg/d) were greater with PFA than control but did not differ from monensin (BW = 422 kg and ADG = 1.38 kg/d). Gain:feed was greater with monensin (0.173) than with PFA (0.161) and for the control (0.156). During finishing, ADG, G:F, and carcass traits did not differ, whereas DMI and acute proteins were lesser with monensin than with PFA and for the control.</p></div><div><h3>Implications and Applications</h3><p>Growing steers fed PFA had similar DMI and ADG but lesser G:F than did those given monensin. Both PFA and monensin resulted in similar growth performance and G:F in the finishing phase.</p></div>","PeriodicalId":8519,"journal":{"name":"Applied Animal Science","volume":null,"pages":null},"PeriodicalIF":1.4000,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590286523000678/pdf?md5=7c47d81c5b0c8e9e7f638a4c00ce8014&pid=1-s2.0-S2590286523000678-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Effects of a phytogenic feed additive on growth performance, feed intake, and carcass traits of beef steers\",\"authors\":\"W.Z. Yang , P.M.T. Lima , S. Ramirez , E. Schwandt , T.A. 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引用次数: 0
摘要
目的研究一种市产植物性饲料添加剂(PFA)对生长肥育肉牛生长性能、饲料效率、胴体性状、肝脓肿及免疫应答的影响。材料与方法选用45头安格斯杂交阉牛(初始体重= 272±20.5 kg)，饲养在4.9 × 1.8 m的单栏内，采用完全随机区组设计，进行生长110 d和肥育120 d试验。牛被体重阻断，并被分配到3个处理中的1个:对照组(不含PFA和莫能菌素)，PFA剂量为500毫克/头每天，或莫能菌素剂量为300毫克/头每天。每天1次自由饲喂TMR，生长期在第32、59和110天称重，肥育期只在开始和结束时称重。结果与讨论在生长过程中，DMI无显著差异;415 vs 403 kg)和日增重(数值;1.31 vs. 1.20 kg/d)，但与莫能菌素组(体重= 422 kg，平均日增重= 1.38 kg/d)差异不显著。增重:莫能菌素组(0.173)高于PFA组(0.161)和对照组(0.156)。在肥育期间，平均日增重、G:F和胴体性状无显著差异，而莫能菌素组的DMI和急性蛋白含量低于PFA组和对照组。与给予莫能菌素相比，饲喂PFA的生长公牛具有相似的DMI和ADG，但G:F较低。PFA和莫能菌素在肥育期的生长性能和G:F相似。
Effects of a phytogenic feed additive on growth performance, feed intake, and carcass traits of beef steers
Objective
This study examined the effects of a commercial phytogenic feed additive (PFA) on growth performance, feed efficiency, carcass traits, liver abscesses, and the immune response of growing and finishing steers.
Materials and Methods
Forty-five crossbred Angus steers (initial BW = 272 ± 20.5 kg) housed in individual pens (4.9 × 1.8 m) were used in a randomized complete block design in a 110-d growing and 120-d finishing experiment. Steers were blocked by BW and allocated to 1 of 3 treatments: control (without PFA and monensin), PFA at 500 mg/steer daily, or monensin at 300 mg/steer daily. Steers were fed a TMR ad libitum once daily and weighed on d 32, 59, and 110 in the growing phase but only at the beginning and the end of the finishing phase.
Results and Discussion
During growing, DMI did not differ, whereas final BW (trend; 415 vs. 403 kg) and ADG (numerically; 1.31 vs. 1.20 kg/d) were greater with PFA than control but did not differ from monensin (BW = 422 kg and ADG = 1.38 kg/d). Gain:feed was greater with monensin (0.173) than with PFA (0.161) and for the control (0.156). During finishing, ADG, G:F, and carcass traits did not differ, whereas DMI and acute proteins were lesser with monensin than with PFA and for the control.
Implications and Applications
Growing steers fed PFA had similar DMI and ADG but lesser G:F than did those given monensin. Both PFA and monensin resulted in similar growth performance and G:F in the finishing phase.
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