期刊文献

Effects of pen cleaning on feedlot performance and carcass characteristics of beef steers fed during the winter in the northern Great Plains 收藏

围栏清洗对大平原北部冬季饲喂的牛肉ers的育肥性能和car体特性的影响
摘要
The objective of this study was to evaluate the impacts of winter pen cleaning on livestock performance of beef cattle fed to finish in the northern Great Plains. To accomplish our research objective, 156 mixed-breed beef steers (284 ± 14 kg) were stratified by weight and randomly assigned to one of 12 open-lot feedyard pens for a 195 day feeding study. Treatments were assigned randomly to pen and consisted of: 1) Control - no cleaning, 2) Apron - bunk aprons cleaned twice throughout the study, and 3) Full - entirety of the pen cleaned twice throughout the study. Full pens or bunk aprons were cleaned on d 49 and 133. Pens were stocked at 30.1 m2 of pen space per steer. Steers were adapted to and finished on a common finishing diet. Fresh wheat straw was placed on bedding areas weekly, with an estimated 2.5 kg cereal straw·steer−1·d−1 used as bedding during the study. Pen cleaning did not influence (P ≥ 0.48) animal performance. Hot carcass weight, ribeye area, back fat and yield grade of carcasses were not affected (P ≥ 0.44) by pen cleaning treatment. We observed that increasing extent of pen cleaning increased (P = 0.03) marbling score (444, 463, and 484 ± 11.1 for control, apron, and full, respectively). Increasing extent of pen cleaning resulted in increased (P = 0.03) quality grade of carcasses. Visual assessment of pen condition, apron score, and tag score were impacted by cleaning regimen by period interaction (P ≤ 0.01). Pen cleaning resulted in improved pen conditions or apron scores compared to control pens, and decreased tag scores compared to control steers (P < 0.05). Pen cleaning did not improve animal performance but did improve marbling score of carcasses in this study.
摘要译文
这项研究的目的是评估冬季围栏清洗对在大平原北部饲养的肥牛的家畜性能的影响。为了实现我们的研究目标,按重量对156头混种公牛肉(284±14千克)进行分层,并随机分配给12只开敞式饲养场钢笔之一,进行195天的喂养研究。将治疗随机分配给笔,包括:1)对照–不清洁,2)围裙–上下铺围裙在整个研究中清洗两次,和3)Full –整个研究期间,笔清洗两次。在第49和133天时清洗全部的围栏或双层围裙。围栏的存储量为每头公牛30.1 m 2 。对牛皮进行调整以使其适应普通的饮食习惯。每周将新鲜的麦草放到被褥区域,研究期间估计将2.5公斤谷物麦草·钢 −1 ·d −1 用作被褥。清洁笔不会影响动物的性能(P≥0.48)。围栏清洁处理不影响体的热重,肋眼面积,背脂肪和yield体的收成等级(P≥0.44)。我们观察到,笔清洁程度的增加使大理石花纹的大理石花纹得分(对照组,围裙和饱足分别为444、463和484±11.1)(P = 0.03)。笔清洁程度的提高导致(体的质量等级提高(P = 0.03)。视觉效果评估笔的状态,围裙评分和标签评分受定期互动清洁方案的影响(P≤0.01)。与对照笔相比,清洁笔可以改善笔的状况或围裙得分,与对照组相比,可以降低标签得分(P <0.05)。在这项研究中,笔的清洁并不能改善动物的生产性能,但是可以改善mar体的大理石花纹得分。
B.W.Neville;R.L.Moore;W.J.Rodehorst. Effects of pen cleaning on feedlot performance and carcass characteristics of beef steers fed during the winter in the northern Great Plains[J]. Livestock Science, 2020,241