本研究的目的是评估单宁和莫能菌素补充剂在饲养场饮食和品种中的作用(荷斯坦与安格斯×荷斯坦)关于增长业绩,能量效率,和胴体特征。80头纯种荷斯坦小牛(HOL;初始体重(BW)=130±5kg)和80头安格斯×荷斯坦小牛(AXH;初始BW=129±6kg)被初始BW阻断,并随机分配到40笔。饮食治疗包括以蒸汽片玉米为基础的饮食,补充1)无饲料添加剂(CON);2)30毫克莫能菌素/千克干物质(DM)(MON;Rumensin90,Elanco,格林菲尔德,IN);3)1.5g单宁)/kgDM(TAN;ByPro,70%缩合单宁,SilvaFeed,Indunor,S.A.,布宜诺斯艾利斯,阿根廷);4)M+T,MON+TAN膳食治疗的组合。数据以2×4阶乘排列的随机完整块进行分析,使用笔作为实验单位。饲料添加剂与品种间无交互作用(P>0.05)。补充MON增加(P≤0.04)初始112天BW并获得效率。然而,饲粮处理对总体生长性能无影响(P>0.10)。与其他饮食治疗相比,7月份补充莫能菌素降低了最低每日瘤胃温度(P=0.04),但TAN不影响瘤胃温度。与AXH相比,荷斯坦啤酒的总DM摄入量更高(P=0.04),总体ADG无差异(P=0.19),与HOL相比,AXH的增益效率增加(P<0.01)。用于维持和获得的膳食净能量,基于增长表现,AXH比HOL更大(P≤0.01)。与HOL相比,AXH牛的屠体重量更大(P≤0.01),敷料百分比,肾,骨盆,和心脏脂肪,第12肋脂肪厚度,长肌区,和初步产量等级。与AXH相比,6月荷斯坦州的最低平均瘤胃温度较低(P≤0.04),7月或8月品种间无差异(P≥0.14)。结果表明,饲料添加剂不会明显影响母牛的生长性能和car体特性,但是杂种AXH牛的增长表现更好,膳食能量利用效率,与HOL相比,car体质量措施。这项研究观察到AXH与HOL相比,维持能量消耗减少了4.7%。意味着HOL和AXH的维护能量系数为0.086对0.082,分别。
The objective of the current study was to evaluate the effects of tannin and monensin supplementation in feedlot diets and breed (Holstein vs. Angus × Holstein) on growth performance, energetic efficiency, and carcass characteristics. Eighty purebred
Holstein calves (HOL; initial body weight (BW) = 130 ± 5 kg) and 80 Angus ×
Holstein calves (AXH; initial BW = 129 ± 6 kg) were blocked by initial BW and randomly assigned to 40 pens. Dietary treatments consisted of a steam-flaked corn-based diet supplemented with (1) no feed additive (CON); (2) 30 mg of monensin/kg of dry matter (DM; MON; Rumensin 90, Elanco, Greenfield, IN); (3) 1.5 g tannin)/kg of DM (TAN; ByPro, 70% condensed tannin, SilvaFeed, Indunor, S.A., Buenos Aires, Argentina); (4) M + T, the combination of MON plus TAN dietary treatments. Data were analyzed as a randomized complete block in a 2 × 4 factorial arrangement of treatments, using pens as experimental units. There were no interactions (P > 0.05) between feed additives and breed. Supplemental MON increased (P ≤ 0.04) initial 112-d BW and gain efficiency. However, there were no dietary treatment effects (P > 0.10) on overall growth performance. Monensin supplementation decreased (P = 0.04) minimum daily ruminal temperature compared with other dietary treatments during July, but TAN did not affect ruminal temperature. Holstein steers had greater (P = 0.04) overall DM intake compared with AXH, with no difference (P = 0.19) in overall ADG, leading to increased (P < 0.01) gain efficiency for AXH compared with HOL. Dietary net energy for maintenance and gain, based on growth performance, were greater (P ≤ 0.01) for AXH vs HOL. Compared with HOL, AXH steers had greater (P ≤ 0.01) carcass weight, dressing percentage, kidney, pelvic, and heart fat, 12th rib fat thickness, longissimus area, and preliminary yield grade. Holstein steers had lower (P ≤ 0.04) minimum average ruminal temperature during June compared with AXH, with no differences (P ≥ 0.14) between breeds during July or August. Results indicate that feed additives did not appreciably affect steer growth performance and carcass characteristics, but crossbred AXH steers had greater growth performance, efficiency of dietary energy utilization, and carcass quality measures compared with HOL. This study observed a reduction (4.7%) in maintenance energy expenditure in AXH compared with HOL, implying in maintenance energy coefficient of 0.086 vs 0.082 for HOL and AXH, respectively.
Effects of tannin and monensin supplementation on growth performance, energetic efficiency, and carcass characteristics were evaluated in Holstein and Angus ×
Holstein steers. The investigation used a factorial design to access the impacts of both feed additives and breed on the study’s parameters. Tannin supplementation did not affect growth performance. There were no dietary treatment effects on overall steer growth performance. Calf
Holstein steers were fed with grain diet based.
Holstein steers had greater overall DM intake than Angus ×
Holstein steers, but breed did not affect average daily gain. Thus, gain efficiency was greater for Angus ×
Holstein vs
Holstein steers. There was no effect of dietary treatment on carcass measures. Compared with Holsteins, Angus × Holstein steers had greater carcass weight, dressing percentage, internal and external fat, longissimus area, and marbling score than Holstein steers. The current study suggests that monensin and tannin supplementation did not affect overall steer growth performance and carcass characteristics. Compared with Holsteins, crossbred Angus × Holstein steers had increased growth performance and carcass quality measures.