去除润滑油对肉牛组织浓度、计算的氨气排放、活产性能和胴体特性的影响

IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Applied Animal Science Pub Date : 2023-12-01 DOI:10.15232/aas.2023-02442
Gary J. Vogel , William C. Kayser , Michael C. Savides , Matt Edmonds , Nick Van Engen , Tracye M. Edwards , Janet B. Allen , Phillip J. Rincker , Ty E. Lawrence , Floyd K. McKeith , Scott E. Roland , G. Allen Bridges , K.D. Miller , Cory T. Herr
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引用次数: 0

摘要

本研究的目的是评估饲喂润滑脂(LB)的育肥牛的组织残留水平,计算NH3气体排放以及活畜和胴体生长情况。材料与方法在试验1中,将50头阉牛自由饲喂饲粮,饲粮中LB的DM含量分别为1.54或5.53 mg/kg,饲喂14 d,屠宰前分别在0、1、2、4、6或8 d进行去除试验。收集和分析的非胃肠道组织包括肌肉、肝脏、舌头、心脏、骨骼、骨髓和肌腱。在试验2中,700头阉牛分别在56 d的饲粮中添加3.5 mg/kg DM的LB或阴性对照。在屠宰前,分别在饲粮中添加0、2、4、6、8和16 d去除LB。屠宰时,一小部分阉牛(35头;每处理5头)分别从胃肠道和非胃肠道组织取样LB残留,剩余动物用于活体和胴体生长评估。结果与讨论实验1中,除舌外,其余非胃肠道组织均低于3 μg/kg定量限。在较高添加水平(5.53 mg/kg)下,去除0 d和1 d后,舌部残留分别为3.80和2.08 μg/kg。在胃肠道组织,引导补充低剂量(1.54毫克/公斤)检测残留在网(0 - 2 d)、瘤胃(0 - 1 d),重瓣胃(0 - 4 d)和皱胃(0 - 2 d)。引导补充与高剂量(5.53毫克/公斤),有可检测残留在网(0 - 4 d),瘤胃(0 - 2 d),重瓣胃(- d),小肠(0-1d)和大肠(0 d)。在实验2中,磅残留的定量限为1μg / kg,和残留检测在肝(0 d),肌肉(0 - 2 d)、瘤胃(0 - 4 d),网肌(0-4 d)和瓣肌(0-16 d)。添加LB的阉牛最终体重(P <0.001), ADG (P <0.001), G:F (P<0.001),热胴体重(P <0.001), DP (P <0.001),肋眼面积(P <0.001),高于阴性对照。此外,饲喂LB的阉牛的大理石纹评分(P <0.001)和YG (P <0.001)。计算出的NH3气体排放量更大(P<0.001),对照组(6,204 g/头)与补充lb的牛(5,202至5,348 g/头)相比。这些结果表明,LB残留浓度受补充浓度、组织类型和屠宰前去除时间的影响。此外,添加LB可提高红肉产量,减少计算的NH3气体排放量。
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Effects of lubabegron removal on tissue concentration, calculated ammonia gas emissions, live performance, and carcass characteristics of beef steers

Objective

Our objective was to evaluate tissue residue levels, calculated NH3 gas emissions and live and carcass growth in finishing beef steers fed lubabegron (LB).

Materials and Methods

In Exp 1, 50 steers were fed ad libitum a diet containing LB at 1.54 or 5.53 mg/kg of DM for 14 d, followed by a voluntary removal duration of 0, 1, 2, 4, 6, or 8 d before slaughter. Nongastrointestinal tract (GI) tissues collected and analyzed were muscle, liver, tongue, heart, bone, bone marrow, and tendon. In Exp 2, 700 steers were supplemented with either a diet containing LB at 3.5 mg/kg of DM or a negative control for 56 d. Supplementation was followed by removal durations of 0, 2, 4, 6, 8, and 16 d before slaughter. At slaughter, a subset of steers (35; 5 per treatment) were selected to sample GI and non-GI tissues for LB residues, and the remaining animals were used to evaluate the live and carcass growth.

Results and Discussion

In Exp 1, all non-GI tract tissues were below the 3 μg/kg limit of quantification (LOQ), except for the tongue. At the greater supplementation level (5.53 mg/kg) tongue had residues of 3.80 and 2.08 μg/kg for removal durations 0 and 1 d, respectively. Within GI tissues, steers supplemented with the lower dose (1.54 mg/kg) had detectable residues within the reticulum (0–2 d), rumen (0–1 d), omasum (0–4 d), and abomasum (0–2 d). Steers supplemented with the higher dose (5.53 mg/kg), had detectable residues within the reticulum (0–4 d), rumen (0–2 d), omasum (0–6 d), small intestine (0–1d), and large intestine (0 d). In Exp 2, the LOQ for LB residues was 1 μg/kg, and residues were detectable in liver (0 d), muscle (0–2 d), rumen (0–4 d), reticulum (0–4 d), and omasum (0–16 d). Steers supplemented with LB had greater final BW (P < 0.001), ADG (P < 0.001), G:F (P< 0.001), hot carcass weight (P < 0.001), DP (P < 0.001), and rib-eye area (P < 0.001) than the negative control. Furthermore, steers fed LB exhibited reduced marbling score (P < 0.001) and YG (P < 0.001) compared with control steers. Calculated NH3 gas emissions were greater (P< 0.001) for control steers (6,204 g/head) compared with LB-supplemented steers (5,202 to 5,348 g/head).

Conclusions and Application

These results demonstrate that LB residue concentrations are affected by supplementation concentrations, tissue type, and duration of removal before slaughter. Furthermore, the LB supplementation results in greater red meat yield and decreased calculated NH3 gas emissions.

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来源期刊
Applied Animal Science
Applied Animal Science AGRICULTURE, DAIRY & ANIMAL SCIENCE-
CiteScore
3.00
自引率
6.70%
发文量
68
期刊最新文献
Table of Contents Editorial Board Call for Submissions Fabrication yields and allometric growth coefficients of carcass components of serially slaughtered implanted or non-implanted beef steers Comparison of a single extended-release implant and a re-implant strategy on performance and carcass characteristics of beef finishing heifers
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