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首页> 外文期刊>The Bovine Practitioner >Comparison of feedlot health, nutritional performance, carcass characteristics and economic value of unweaned beef calves with an unknown health history and weaned beef calves receiving various herd-of-origin health protocols
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Comparison of feedlot health, nutritional performance, carcass characteristics and economic value of unweaned beef calves with an unknown health history and weaned beef calves receiving various herd-of-origin health protocols

机译：未知健康史的断奶牛肉犊和接受各种原产地卫生规程的断奶牛肉犊的饲养场健康，营养性能，car体特性和经济价值的比较

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摘要

This study was conducted in a commercial feedlot to compare the health, nutritional performance, carcass characteristics and economic value of three groups of 600 lb (273 kg) beef steer calves-one group of unweaned calves of unknown health history and two groups of calves administered a herd-of-origin health protocol with at least a 45-day weaning period. Calves were purchased between December 1 and December 20, 2003, and were harvested between April 22 and June 2, 2004. Calves identified as persistently infected with bovine viral diarrhea virus remained in their respective treatment groups for the duration of the study. Mortality rates were low in all groups of steers and were unaffected (P>0.14) by treatment. Compared with steers administered health protocols, steers of unknown health history had higher (P<0.05) morbidity, lower average daily gain and lower feed intake, particularly early in the feeding period. Additionally, steers with an unknown health history were more likely than health protocol steers to receive multiple treatments for respiratory disease during the entire feeding period. Treatment costs were approximately $7 per head higher for steers of unknown health history. Although feed efficiency was not affected (P>0.57) by treatment, steers of unknown health history required an additional 16 days-on-feed to reach the desired back fat thickness. Neither quality grade nor yield grade was affected by treatment, but the trend was towards a lower (less favorable) quality grade and lower (more favorable) yield grade in calves of unknown health history. Unadjusted for days-on-feed, profit per head was not affected (P=0.64) by treatment; however, on the basis of an equal number of days-on-feed, steers administered the WeanVACO(R) health protocol at the herd of origin returned $33.71 more net income per head than steers of unknown health history, whereas steers administered other 45-day programs returned $11.36 more net income per head than steers of unknown health history.
机译：这项研究是在一个商业饲养场进行的，比较了三组600磅（273千克）牛ste牛的健康，营养性能，car体特性和经济价值，一组是无奶牛，健康史未知，另一组是犊牛至少有45天断奶期的原住民健康协议。在2003年12月1日至12月20日之间购买了小牛，并在2004年4月22日至6月2日之间收获了小牛。在研究期间，被确定为持续感染牛病毒性腹泻病毒的小牛仍留在各自的治疗组中。所有ste牛皮组的死亡率均较低，且未受到治疗的影响（P> 0.14）。与管理健康方案的ers牛皮相比，未知健康史的ste牛皮的发病率更高（P <0.05），平均日增重较低，且采食量较低，尤其是在饲喂初期。此外，在整个喂养期间，具有未知健康史的ste牛比健康规程ste牛更有可能接受多种呼吸道疾病治疗。对于未知健康史的ste牛皮，每头治疗费用高出约7美元。尽管治疗不会影响饲料效率（P> 0.57），但健康史未知的ers牛需要额外进食16天才能达到所需的背部脂肪厚度。品质等级和产量等级均不受治疗的影响，但趋势是在健康史未知的犊牛中，品质等级较低（不利）而产量等级较低（较有利）。未经调整的饲喂日数，人均利润不受治疗影响（P = 0.64）;但是，根据同等的喂食天数，在来源群中执行WeanVACO（R）健康协议的ste牛皮的人均纯收入比未知健康历史的ste牛皮的人均纯收入高33.71美元，而在其他45-日程计划返回的人均纯收入比未知健康史的人高出11.36美元。

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