4种不同的种植方案对本地轻质肉牛的饲料性能、健康和胴体特性的影响

IF 2.7 2区农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Journal of animal science Pub Date : 2025-05-20 DOI:10.1093/jas/skaf102.242

Ty J Schoelerman, John P Hutcheson, Lee-Anne J Walter, Wade T Nichols, Ben P Holland, Alyssa B Word

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引用次数: 0

摘要

由于新的再种植限制，延迟种植剂给药可以防止在喂养期结束时种植体覆盖率不足。因此,本研究的目标是确定的影响传统reimplant程序[Synovex选择(100毫克trenbolone醋酸和14毫克苯甲酸雌二醇)与Synovex reimplanted到达110天+(200毫克trenbolone醋酸和28毫克苯甲酸雌二醇)(CHPL)相对于一个延长释放植入(Revalor XH(200毫克trenbolone醋酸和20毫克雌二醇)(XH)]在到达(XH0)或延迟40 (XH40)或80 d (XH80)来确定一个理想的植入窗口试验选取初始体重为254±27.24 kg的2800头犊牛，按犊牛到达时间进行分组，随机分组。XH80犊牛干物质采食量降低（P = 0.02）， XH0犊牛和CHPL犊牛干物质采食量最大，XH40犊牛无显著差异。两组间的最终体重、平均日增重和净重比无显著差异（P≥0.12）。热胴体重在不同处理间差异不显著（P≥0.19），而肋眼面积在XH40 （83.42 cm2）或CHPL （83.35 cm2）组大于XH80 （81.61 cm2）组（P = 0.02）；XH0 （82.64 cm2）与其他处理无显著差异。种植体治疗对背膘和EBF无影响（P≥0.10）；CHPL（455）处理的大理石纹评分低于XH80（478）处理（P = 0.04），而XH0（470）和XH40（459）处理与其他处理差异不显著。USDA优级的胴体比例最高(P <；0.01), XH80(5.78%)，而XH0（2.55%）和CHPL（2.72%）。与其他处理（XH0、XH40和XH80分别为76.11%、71.94%和74.84%）相比，CHPL处理的胴体分级选择率（65.89%）也降低（P = 0.05）。相反，分级选择的胴体比例最大(P <；与所有XH处理相比，CHPL为0.01)。没有治疗中不同比例的尸体分类YG 1, 3或5 (P≥0.20)。而在CHPL中，YG2组的屠体比例最高（31.74%），XH0组最低（24.95%），XH40组最低（26.83%），XH80组与其他处理差异无统计学意义（27.39%）。与CHPL（19.21%）和XH40（19.58%）相比，XH80（25.74%）和XH0（24.68%）的YG4分类率更高（P = 0.01）。revvalor - xh在到达或延迟40、80d时对小母牛的活生长性能没有影响，尽管在第80天施用revvalor - xh会降低DMI。再植入Synovex Choice和Synovex Plus并不影响活体性能或HCW，但与Revalor-XH到达或延迟给药相比，结果是胴体更瘦，质量等级降低。

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120 The effect of four different implant programs on feedyard performance, health, and carcass characteristics of native light weight beef heifers

Due to new reimplant restrictions, delaying implant administration after arrival could prevent inadequate implant coverage at the end of the feeding period. Therefore, the objectives of this study were to determine the effects of a traditional reimplant program [Synovex Choice (100 mg trenbolone acetate and 14 mg estradiol benzoate) on arrival reimplanted at 110 days with Synovex Plus (200 mg trenbolone acetate and 28 mg estradiol benzoate) (CHPL)] relative to an extended release implant [Revalor XH (200 mg trenbolone acetate and 20 mg estradiol) (XH)] administered on arrival (XH0) or delayed 40 (XH40) or 80 d (XH80) to determine an ideal implant window in heifers fed 219 d. A total of 2,800 heifers (initial BW = 254 ± 27.24 kg.) were enrolled, blocked by time of arrival and randomized to treatment. Dry matter intake was reduced (P = 0.02) in XH80 heifers, greatest in XH0 and CHPL heifers with XH40 heifers not different. There were no differences in final BW, ADG or G:F between treatments (P ≥ 0.12). Hot carcass weight did not differ (P ≥ 0.19) between treatments, whereas ribeye area was greater (P = 0.02) when heifers were administered XH40 (83.42 cm2) or CHPL (83.35 cm2) vs XH80 (81.61 cm2); XH0 (82.64 cm2) did not differ from other treatments. Implant treatment did not affect backfat and EBF (P ≥ 0.10); however, marbling score was lower (P = 0.04) for CHPL (455) heifers vs. XH80 (478) while XH0 (470) and XH40 (459) were not different than other treatments. Percentage of carcasses grading USDA Prime was greatest (P < 0.01) for XH80 (5.78%), vs XH0 (2.55%) and CHPL (2.72%). Percentage of carcasses grading Choice was also reduced (P = 0.05) for CHPL (65.89%) compared to all other treatments (76.11, 71.94 and 74.84% for XH0, XH40 and XH80, respectively). Conversely, the percentage of carcasses grading Select was greatest (P < 0.01) for CHPL compared to all XH treatments. There were no differences among treatments in percentage of carcasses classified YG 1, 3, or 5 (P ≥ 0.20). However, percentage of carcasses classified YG2 was greatest (P = 0.02) in CHPL (31.74%), least in XH0 (24.95%) and XH40 (26.83%), with XH80 (27.39%) not different than other treatments. Percentage of carcasses classified YG4 was greater (P = 0.01) for XH80 (25.74%) and XH0 (24.68%) compared to CHPL (19.21%) and XH40 (19.58%). Revalor-XH on arrival or delayed 40, or 80d did not affect live growth performance of heifers, although DMI was reduced when Revalor-XH was administered on day 80. A reimplant program of Synovex Choice followed by Synovex Plus did not affect live performance or HCW but resulted in leaner carcasses and reduced quality grade compared to an on-arrival or delayed administration of Revalor-XH.

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来源期刊

Journal of animal science 农林科学-奶制品与动物科学

CiteScore

4.80

自引率

12.10%

发文量

1589

审稿时长

3 months

期刊介绍： The Journal of Animal Science (JAS) is the premier journal for animal science and serves as the leading source of new knowledge and perspective in this area. JAS publishes more than 500 fully reviewed research articles, invited reviews, technical notes, and letters to the editor each year. Articles published in JAS encompass a broad range of research topics in animal production and fundamental aspects of genetics, nutrition, physiology, and preparation and utilization of animal products. Articles typically report research with beef cattle, companion animals, goats, horses, pigs, and sheep; however, studies involving other farm animals, aquatic and wildlife species, and laboratory animal species that address fundamental questions related to livestock and companion animal biology will be considered for publication.