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首页> 美国卫生研究院文献>Translational Animal Science >Effects of low-moisture sugarcane molasses-based block supplementation on growth physiological parameters and liver trace mineral status of growing beef heifers fed low-quality warm-season forage
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Effects of low-moisture sugarcane molasses-based block supplementation on growth physiological parameters and liver trace mineral status of growing beef heifers fed low-quality warm-season forage

机译：低水分以甘蔗糖蜜为基础的块状添加物对饲喂劣质暖季饲草的生长后小母牛的生长生理参数和肝脏微量矿物质状况的影响

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The objectives of the study were to evaluate the growth, physiological parameters, and liver trace mineral status of beef heifers provided low-quality warm-season forage and different forms (meal vs. block) of trace mineral-fortified supplementation. One hundred yearling Nellore heifers were blocked by initial body weight (BW) (184 ± 2.5 kg) and randomly assigned into 1 of 20 drylot pens (5 heifers/pen). Treatments were randomly assigned to pens (5 pens/treatment) and consisted of heifers receiving: 1) a loose meal trace mineral supplement (TM; De Heus Animal Nutrition Industry); 2) free choice access to a low-moisture, cooked sugarcane molasses-based protein block (LMB); 3) isocaloric and isonitrogenous, loose meal protein supplement pair-fed to LMB supplement dry matter (DM) intake (PSPF); and (4) loose meal protein supplement offered at 0.2% of BW (PS). Supplements were formulated to achieve same daily intake of supplemental trace mineral among treatments. Hence, TM supplement was offered at 66.6% of the supplement DMI of LMB heifers. Heifers were offered free choice access to water and ground brachiaria ( ) hay from day 0 to 45. Overall average daily gain from day 0 to 45 was the least for TM heifers ( ≤ 0.05) and did not differ among LMB, PSPF, and PS heifers ( ≥ 0.60). Daily hay DMI did not differ among treatments ( ≥ 0.63). Total intake of DM and TDN were least for TM heifers ( ≤ 0.03) and did not differ ( ≥ 0.66) among LMB, PSPF, and PS heifers. Total supplemental intake of crude protein (CP) and rumen degradable protein (RDP) and total intake of CP and RDP (supplement + hay) were least for TM and greatest for PS heifers ( ≤ 0.05), and intermediate for LMB and PSPF heifers ( ≥ 0.70). Effects of treatment × day and treatment were not detected ( ≥ 0.61) for plasma concentrations of insulin-like growth factor 1 (IGF-1), and non-esterified fatty acids (NEFA). Effects of treatment were detected for plasma concentrations of PUN ( = 0.005) and tended to be detected for plasma concentrations of glucose ( = 0.08), which were least for TM heifers ( ≤ 0.03) and did not differ ( ≥ 0.17) among LMB, PSPF, and PS heifers. Trace mineral intake and liver concentrations of all trace minerals did not differ ( ≥ 0.13) among treatments. Hence, the use of LMB supplementation resulted in positive effects on growth without impacting trace mineral status compared to a loose meal trace mineral salt, and similar growth performance and trace mineral status compared to a conventional protein supplementation offered at 0.2% of body weight.
机译：该研究的目的是评估牛肉小母牛的生长，生理参数和肝脏中的微量矿物质状况，这些牛肉提供了低质量的暖季饲草和不同形式的（矿物质或块状）微量矿物质强化补充剂。一百岁的内罗尔小母牛被初始体重（BW）（184±2.5公斤）阻滞，并随机分配到20只干圈钢笔中的1个（5个小母牛/笔）中。将处理随机分配给围栏（每支处理5支），由接受以下操作的小母牛组成：1）微量膳食微量矿物质补充剂（TM; De Heus动物营养工业）; 2）免费选择低水分，煮熟的甘蔗糖蜜糖基蛋白块（LMB）; 3）等热量和等氮的松散膳食蛋白质补充剂，与LMB补充剂干物质（DM）摄入量（PSPF）配对; （4）膳食补充蛋白质的松散度为体重的0.2％（PS）。制定了补充剂，以在治疗之间实现每日相同的补充微量矿物质摄入量。因此，TM补充剂占LMB小母牛补充剂DMI的66.6％。从第0天到45天，小母牛可以自由选择水和地上的腕chi干草。从0天到45天，TM小母牛的总体平均日增重最少（≤0.05），LMB，PSPF和PS之间没有差异小母牛（≥0.60）。每日干草DMI在不同处理之间无差异（≥0.63）。 TM母牛的DM和TDN总摄入量最少（≤0.03），而LMB，PSPF和PS母牛之间的总摄入量没有差异（≥0.66）。 TM仔猪补充粗蛋白（CP）和瘤胃可降解蛋白（RDP）的总摄入量以及CP和RDP的总摄入量（补充+干草）最小，PS小母牛最大（≤0.05），而LMB和PSPF小母牛中等（ ≥0.70）。血浆胰岛素样生长因子1（IGF-1）和非酯化脂肪酸（NEFA）的血浆浓度未检测到治疗×天和治疗的效果（≥0.61）。检测到PUN血浆浓度（= 0.005）的治疗效果，并且倾向于检测到葡萄糖血浆浓度（= 0.08）的治疗效果，这对于TM小母牛而言最小（≤0.03），并且在LMB之间没有差异（≥0.17）， PSPF和PS小母牛。治疗之间所有痕量矿物质的痕量矿物质摄入和肝脏浓度均无差异（≥0.13）。因此，与散装的微量矿物质盐相比，使用LMB补充剂对生长产生了积极的影响，而不会影响微量矿物质的状态，与以0.2％体重提供的常规蛋白质补充物相比，LMB的生长性能和微量矿物质的状态也相似。

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