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"April" Cover "四月 "封面
IF 1.5 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2024-03-27 DOI: 10.1016/S2590-2865(24)00038-7
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引用次数: 0
February" Cover 二月 "封面
IF 1.5 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2024-02-01 DOI: 10.1016/S2590-2865(24)00007-7
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引用次数: 0
Effects of starch dilution with corn stalks or wet distillers grains with solubles on growth performance and carcass characteristics of feedlot steers 用玉米秸秆或带溶解物的湿蒸馏谷物稀释淀粉对饲养场母牛生长性能和胴体特征的影响
IF 1.5 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2024-02-01 DOI: 10.15232/aas.2023-02459
A.M. Kobza , J.D. Young , J.T. Richeson , T.E. Lawrence , M.E. Youngers , K.L. Samuelson

Objective

This study evaluated the effects of starch dilution with different sources of dietary fiber from terminal implant to slaughter on growth performance, energy utilization, and carcass characteristics of feedlot cattle.

Materials and Methods

Steers (n = 416; initial BW = 372 ± 2.67 kg) were allocated to 48 pens in a randomized complete block design. Pens of cattle (n = 12 per treatment) were assigned to 1 of 4 treatments consisting of diets based on steam-flaked corn, containing (1) 7.50% corn stalks on a DM basis fed for the entire feeding period (CON), (2) 14.75% corn stalks on a DM basis fed from terminal implant to slaughter (CS), (3) 9.50% wet distillers grains with solubles and 7.50% corn stalks on a DM basis fed from terminal implant to slaughter (WD), and (4) 19.00% wet distillers grains with solubles and 0.0% corn stalks on a DM basis fed from terminal implant to slaughter (NR). Six days before administration of the terminal implant, steers were transitioned to their treatment diets using a 2-ration system, whereas CON consumed the same diet throughout the entire feeding period.

Results and Discussion

As expected, performance (BW, DMI, ADG, G:F) was not different from d 0 of the study to dietary transition. Dry matter intake and calculated ME intake from dietary transition to slaughter were greatest for cattle consuming CS, intermediate for WD and CON, and least for NR. Final BW and ADG did not differ among treatments from dietary transition to slaughter; G:F was greatest for NR, intermediate for WD, and least for CS and CON. There was no difference in hot carcass weight, DP, marbling score, QG, YG, or percentage KPH among treatments. Steers consuming CS had greater 12th-rib s.c. fat thickness. The proportion of abscessed livers did not differ among treatments.

Implications and Applications

Increasing the proportion of corn stalks in the diet after terminal implant administration increased DMI and ME intake with no effect on G:F. In contrast, removing corn stalks from the diet and increasing the proportion of wet distillers grains with solubles to provide an equivalent starch concentration reduced DMI and improved G:F.

本研究评估了从末期植入到屠宰期间用不同来源的日粮纤维稀释淀粉对饲养场牛的生长性能、能量利用和胴体特征的影响。每栏牛(n = 12 头)被分配到 4 个处理中的 1 个,这些处理由基于蒸汽压片玉米的日粮组成,其中包含:(1) 在整个饲养期间饲喂 DM 为 7.50% 的玉米秸秆(CON);(2) 从末期植入到屠宰期间饲喂 DM 为 14.75% 的玉米秸秆(CS);(3) 从末期植入到屠宰期间饲喂 DM 为 9.50%的带淀粉湿蒸馏谷物和 7.50%的玉米秸秆(以 DM 为基础),从末期植入到屠宰(WD);以及(4)19.00%的带淀粉湿蒸馏谷物和 0.0%的玉米秸秆(以 DM 为基础),从末期植入到屠宰(NR)。在末期植入前六天,使用 2 种日粮系统将母牛过渡到处理日粮,而 CON 在整个饲养期间食用相同的日粮。结果和讨论正如预期的那样,从研究的第 0 天到日粮过渡期间,性能(体重、DMI、ADG、G:F)没有差异。从日粮过渡到屠宰的整个过程中,CS 的干物质摄入量和计算的 ME 摄入量最大,WD 和 CON 居中,NR 最小。从日粮过渡到屠宰期间,各处理的最终体重和ADG没有差异;NR的G:F最大,WD的G:F居中,CS和CON的G:F最小。不同处理的热胴体重量、DP、大理石纹评分、QG、YG 或 KPH 百分比没有差异。食用 CS 的母牛第 12 肋 s.c. 脂肪厚度更大。不同处理的脓肝比例没有差异。意义和应用在末期植入后增加日粮中玉米秆的比例可增加 DMI 和 ME 摄入量,但对 G:F 没有影响。与此相反,从日粮中去除玉米秆并增加湿蒸馏酒糟的比例以提供同等的淀粉浓度可降低 DMI 并改善 G:F。
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引用次数: 0
Economic-impact variability among F1 Nellore–Angus herd sires reared together and used in multiple-sire mating groups 多胎交配组中共同饲养的 F1 内洛尔-安格斯种群父本之间的经济影响差异
IF 1.5 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2024-02-01 DOI: 10.15232/aas.2023-02419
Logan T. Dodd , David P. Anderson , David G. Riley , Andy D. Herring

Objective

This study investigated variation of calf number and resulting economic impacts of F1 crossbred sires that were reared together as calves and used in multi- sire, natural-service breeding groups.

Materials and Methods

Birth (n = 540) and weaning (n = 533) calf records were evaluated retrospectively in a crossbred research herd. Sires per annual breeding group varied from 6 to 9; females exposed per bull ranged from 12.5 to 19.5 across years. Bulls born in the same year were reared together, and all bulls were pastured together when not in breeding groups. Calf performance and economic value were determined annually per sire. Mixed model analyses were conducted that included fixed categorical effects of calf birth year, F1 sire type (Angus-sired vs. Nellore-sired), sire nested within type, calf sex, and the interaction of F1 sire type with calf sex.

Results and Discussion

Large differences were observed in calf numbers and performance. Weaned calves produced annually per sire ranged from 0 to 48, when average expectations were 10.5 to 15.2. Average annual calf performance per sire ranged from 29.7 to 49.4 kg for birth weight and 197.4 to 241.4 kg for weaning weight. Annual economic contribution per sire ranged from $0 to $29,582 when considering half of calf value as being attributed to the sire.

Implications and Applications

Commercial cow- calf producers should consider potential sire variability for calf numbers and birth date in combination with traditional calf performance for improved economic assessments in their herds.

材料与方法 在一个杂交研究牛群中,对出生(n = 540)和断奶(n = 533)的犊牛记录进行了回顾性评估。每个年度繁殖组的公牛数量从 6 到 9 不等;每头公牛所产母牛的数量从 12.5 到 19.5 不等。同年出生的公牛在一起饲养,所有公牛在不参加繁殖组时都在一起放牧。每年确定每头公牛的犊牛性能和经济价值。混合模型分析包括犊牛出生年份、F1 父系类型(安格斯配种与内洛尔配种)、父系类型中的嵌套、犊牛性别以及 F1 父系类型与犊牛性别的交互作用的固定分类效应。每个父系每年生产的断奶犊牛从 0 头到 48 头不等,平均预期为 10.5 头到 15.2 头。每头初生犊牛的平均年生产性能为出生重 29.7 至 49.4 千克,断奶重 197.4 至 241.4 千克。如果将犊牛价值的一半归因于初配母牛,则每头初配母牛的年经济贡献从 0 美元到 29,582 美元不等。 意义和应用 商业母牛-犊牛生产者应考虑初配母牛在犊牛数量和出生日期方面的潜在变异性,并结合传统的犊牛性能,以改进其牛群的经济评估。
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引用次数: 0
Growth performance, carcass traits, and feeder calf value of beef × Holstein and Holstein feedlot steers* 牛肉×荷斯坦和荷斯坦饲养场母牛的生长性能、胴体性状和饲养犊牛价值*
IF 1.5 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2024-02-01 DOI: 10.15232/aas.2023-02454
M. Pimentel-Concepción , J.R. Jaborek , J.P. Schweihofer , A.J. Garmyn , M.-G.-S. McKendree , B.J. Bradford , A. Hentschl , D.D. Buskirk

Objective

The objective of this study was to compare feedlot performance, carcass traits, and value of beef × Holstein (B × HO) and Holstein (HO) feedlot steers.

Materials and Methods

After a 21-d acclimation to the feedlot, steers (B × HO, n = 60 and HO, n = 60) were blocked by BW into 10 pens per breed type. Steer BW gain, DMI, and G:F were measured on a 28-d basis. Steers were slaughtered at a commercial abattoir on d 245 for B × HO and 266 for HO, after reaching an average carcass empty body fat of 30.0%. Following a 48-h chill, carcass data were collected.

Results and Discussion

The B × HO steers tended to have 5% greater ADG (1.75 vs. 1.70 kg/d) compared with the HO steers but similar DMI (10.40 vs. 10.35 kg/d). The B × HO steers had 4% greater G:F compared with HO steers (0.172 vs. 0.165). Cost of gain was 14% less for B × HO compared with HO steers ($2.68 vs. $2.83/ kg). Although final live BW tended to be less for B × HO compared with HO steers (622 vs. 635 kg), carcass weights were similar between breed types (365 vs. 367 kg). The B × HO steers had 20% greater LM area (87.8 vs. 73.1 cm2), greater backfat thickness (1.18 vs. 0.79 cm), and a lesser average calculated USDA YG (2.9 vs. 3.2) than HO steers. The B × HO and HO steers had similar average marbling scores (426 vs. 437) and USDA QG. Based on abattoir prices, carcass revenue was greater for B × HO steers ($1,836/carcass) when compared with HO steers ($1,800/carcass). Based on a mean receiving BW of 171.9 kg, calculated breakeven feeder calf value was greater for B × HO steers compared with HO steers ($367 vs. $284/100 kg).

Implications and Applications

Overall, B × HO steers were more feed efficient and produced carcasses with more desirable carcass yield, resulting in greater feeder calf value when compared with HO steers.

材料和方法在饲养场适应 21 天后,按体重将母牛(B × HO,n = 60;HO,n = 60)分隔到每个品种类型的 10 个栏中。每 28 天测量一次母牛的体重增重、DMI 和 G:F。在胴体平均空体脂肪达到 30.0% 后,B × HO 和 HO 牛分别于第 245 天和第 266 天在商业屠宰场屠宰。结果与讨论B × HO 牛的 ADG(1.75 vs. 1.70 kg/d)比 HO 牛高 5%,但 DMI(10.40 vs. 10.35 kg/d)相似。B × HO 牛的 G:F 比 HO 牛高 4%(0.172 比 0.165)。B × HO 牛的增重成本比 HO 牛低 14%(每公斤 2.68 美元对 2.83 美元)。虽然 B × HO 牛的最终活体体重往往低于 HO 牛(622 千克对 635 千克),但不同品种间的胴体重相似(365 千克对 367 千克)。B × HO 牛的 LM 面积(87.8 对 73.1 平方厘米)比 HO 牛大 20%,背膘厚度(1.18 对 0.79 厘米)比 HO 牛大,平均 USDA YG 计算值(2.9 对 3.2)比 HO 牛小。B × HO 牛和 HO 牛的平均大理石纹评分(426 分对 437 分)和 USDA QG 相似。根据屠宰场价格,B × HO 牛的胴体收入(1,836 美元/胴体)高于 HO 牛(1,800 美元/胴体)。总体而言,B × HO 种公牛的饲料效率更高,胴体产量更理想,因此与 HO 种公牛相比,B × HO 种公牛的犊牛饲养价值更高。
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引用次数: 0
Can moderate-quality bermudagrass baleage be used to stretch wheat pasture?* 是否可以使用中等质量的百慕大草捆来拉伸小麦牧场?
IF 1.5 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2024-02-01 DOI: 10.15232/aas.2023-02466
P.A. Beck , M.R. Beck , D. Hubbell III , T. Hess , A.P. Foote , M.S. Gadberry , E.B. Kegley

Objectives

Our objective was to determine the effects of feeding free-choice bermudagrass (Cynodon dactylon) round-bale silage to growing calves stocked at increasing rates and grazing wheat (Triticum aestivum L.) pasture in north-central Arkansas.

Materials and Methods

In the fall and winter, steers were stocked at 2.47 steers/ha without bermudagrass bale- age (HCON) or were stocked at 1× (H1.0), 1.5× (H1.5), or 2× (H2.0) the HCON stocking rate with ad libitum access to bermudagrass round-bale wrapped silage. Each pasture was stocked at 5.6 steers/ha (8 steers per pasture) in the spring, with continued ad libitum silage offered to pastures in the H1.0, H1.5, and H2.0 fall treatments.

Results and Discussion

When steers in H1.0 were offered ad libitum bermudagrass haylage with no change in stocking rate, ADG were increased by 12% over HCON to 1.43 kg/d. As stocking rate increased in the fall and winter from H1.0 to H1.5 and H2.0 treatments, ADG decreased. The ADG of H1.5 (1.25 kg/d) did not differ from HCON (1.27 kg/d), and ADG of H2.0 (1.12 kg/d) was reduced by 12% compared with HCON. There was no effect of of- fering supplemental round-bale haylage on ADG of steers grazing graze-out wheat pastures. Steer grazing days per hectare increased when round-bale haylage was offered, even though stocking rates were not increased during this part of the experiment. Total system net returns did not differ between HCON and H1.0. However, total system net return ($876/ha) was greater for H2.0 compared with H1.0 ($571/ha), whereas H1.5 ($693/ha) was intermediate, dif- fering from neither H1.0 nor H2.0.

Implications and Applications

Feeding moderate- quality roughage during the fall can increase production stability and thus improve economic stability of the wheat stocker enterprise. There does not appear to be an eco- nomic advantage of feeding moderate-quality roughage ad libitum to stockers grazing spring wheat when producers decide to forgo wheat grain harvest and steers graze out the wheat crop.

目标我们的目标是确定在阿肯色州中北部以不断增加的速度饲养并放牧小麦(Triticum aestivum L.)牧草的生长犊牛饲喂自由选择的百慕大草(Cynodon dactylon)圆捆青贮饲料的效果。材料与方法在秋冬季,按 2.47 头/公顷的标准饲养小牛,不使用百慕大草捆(HCON),或按 HCON 饲养率的 1 倍(H1.0)、1.5 倍(H1.5)或 2 倍(H2.0)饲养,同时让小牛自由采食百慕大草圆捆青贮饲料。每个牧场在春季的存栏量为 5.6 头/公顷(每个牧场 8 头),在 H1.0、H1.5 和 H2.0 秋季处理中,继续向牧场自由提供青贮饲料。结果与讨论当 H1.0 中的牧场在存栏量不变的情况下自由提供百慕大草干草时,ADG 比 HCON 增加了 12%,达到 1.43 kg/d。随着秋冬季饲养量的增加,H1.0、H1.5 和 H2.0 处理的 ADG 均有所下降。H1.5 的 ADG(1.25 kg/d)与 HCON(1.27 kg/d)相比没有差异,而 H2.0 的 ADG(1.12 kg/d)比 HCON 降低了 12%。补充圆捆干草对放牧小麦牧草的母牛的平均日增重没有影响。在提供圆捆干草时,每公顷陡坡牛的放牧天数增加了,尽管在这部分试验中没有提高放牧率。HCON 和 H1.0 的系统总净收益没有差异。但是,H2.0 的系统总净收益(876 美元/公顷)高于 H1.0(571 美元/公顷),而 H1.5(693 美元/公顷)处于中间水平,既不同于 H1.0,也不同于 H2.0。当生产者决定放弃收获小麦而让阉牛放牧春小麦时,给放牧春小麦的阉牛自由采食中等质量的粗饲料似乎并不具有生态优势。
{"title":"Can moderate-quality bermudagrass baleage be used to stretch wheat pasture?*","authors":"P.A. Beck ,&nbsp;M.R. Beck ,&nbsp;D. Hubbell III ,&nbsp;T. Hess ,&nbsp;A.P. Foote ,&nbsp;M.S. Gadberry ,&nbsp;E.B. Kegley","doi":"10.15232/aas.2023-02466","DOIUrl":"https://doi.org/10.15232/aas.2023-02466","url":null,"abstract":"<div><h3>Objectives</h3><p>Our objective was to determine the effects of feeding free-choice bermudagrass (<em>Cynodon dactylon</em>) round-bale silage to growing calves stocked at increasing rates and grazing wheat (<em>Triticum aestivum</em> L.) pasture in north-central Arkansas.</p></div><div><h3>Materials and Methods</h3><p>In the fall and winter, steers were stocked at 2.47 steers/ha without bermudagrass bale- age (HCON) or were stocked at 1× (H1.0), 1.5× (H1.5), or 2× (H2.0) the HCON stocking rate with <em>ad libitum</em> access to bermudagrass round-bale wrapped silage. Each pasture was stocked at 5.6 steers/ha (8 steers per pasture) in the spring, with continued <em>ad libitum</em> silage offered to pastures in the H1.0, H1.5, and H2.0 fall treatments.</p></div><div><h3>Results and Discussion</h3><p>When steers in H1.0 were offered <em>ad libitum</em> bermudagrass haylage with no change in stocking rate, ADG were increased by 12% over HCON to 1.43 kg/d. As stocking rate increased in the fall and winter from H1.0 to H1.5 and H2.0 treatments, ADG decreased. The ADG of H1.5 (1.25 kg/d) did not differ from HCON (1.27 kg/d), and ADG of H2.0 (1.12 kg/d) was reduced by 12% compared with HCON. There was no effect of of- fering supplemental round-bale haylage on ADG of steers grazing graze-out wheat pastures. Steer grazing days per hectare increased when round-bale haylage was offered, even though stocking rates were not increased during this part of the experiment. Total system net returns did not differ between HCON and H1.0. However, total system net return ($876/ha) was greater for H2.0 compared with H1.0 ($571/ha), whereas H1.5 ($693/ha) was intermediate, dif- fering from neither H1.0 nor H2.0.</p></div><div><h3>Implications and Applications</h3><p>Feeding moderate- quality roughage during the fall can increase production stability and thus improve economic stability of the wheat stocker enterprise. There does not appear to be an eco- nomic advantage of feeding moderate-quality roughage <em>ad libitum</em> to stockers grazing spring wheat when producers decide to forgo wheat grain harvest and steers graze out the wheat crop.</p></div>","PeriodicalId":8519,"journal":{"name":"Applied Animal Science","volume":"40 1","pages":"Pages 1-13"},"PeriodicalIF":1.5,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2590286524000016/pdf?md5=bb9f303099fe93f2df2cf4923eb96d81&pid=1-s2.0-S2590286524000016-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139653010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Call for Submissions 征集作品
IF 1.5 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2024-02-01 DOI: 10.1016/S2590-2865(24)00011-9
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引用次数: 0
Modeling differences in feed intake and efficiency: Growing and finishing beef cattle 采食量和效率差异模型:生长和育成肉牛
IF 1.5 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2024-02-01 DOI: 10.15232/aas.2023-02443
Carl A. Old , Ian J. Lean , Heidi A. Rossow , Daniel W. Shike

Objective

Our objective was to evaluate model structure choice on estimates of efficiency, based on residual feed intake, and thereby cattle profitability.

Materials and Methods

Efficiencies were compared for 2 models using data from 7 studies (509 cattle). Model 1 DMI were estimated using ordinary least squares as f(ADG and BW0.750). Model 2 was a multivariable Bayesian model; DMI was f(ADG, BW0.750 and BW). For model 2, DMI, BW, and ADG were ranked by model 1 residuals categorized in quintile to evaluate whether information found in residuals related to composition of gain or maintenance.

Results and Discussion

Efficiency rankings lacked concordance and predictive value between models, suggesting that ordinary least squares, Bayesian, or both frameworks lack utility to predict efficiency. With the exception of 1 data set, DMI was better predicted in the Bayesian framework. Estimated recovered energy (Mcal/d) in model 2 was less for cattle in quintile 1 than in quintile 5 for 4 of 7 data sets and numerically less for 6 of 7 data sets. Estimated maintenance in model 2 was less (quintiles 1 vs. 5) for 5 of 7 data sets. Substantial information existed in model 1 residuals regarding differences in composition of gain and maintenance not found in model 2 residuals.

Implications and Applications

Differing efficiencies between models indicate that residuals are properties of models, not cattle. Selection of cattle with less empty body fat may not be desirable from an economic standpoint.

材料与方法利用 7 项研究(509 头牛)的数据,比较了 2 个模型的效率。模型 1 采用普通最小二乘法估算 DMI,即 f(ADG 和 BW0.750)。模型 2 是一个多变量贝叶斯模型;DMI 为 f(ADG、BW0.750 和 BW)。对于模型 2,DMI、BW 和 ADG 根据模型 1 的残差按五分位数分类进行排序,以评估残差中发现的信息是否与增重或维持组成有关。除一个数据集外,贝叶斯框架能更好地预测 DMI。在模型 2 中,7 个数据集中有 4 个数据集中五分位 1 的牛的估计回收能量(Mcal/d)低于五分位 5 的牛,7 个数据集中有 6 个数据集中五分位 1 的牛的估计回收能量(Mcal/d)低于五分位 5 的牛。7 组数据中有 5 组在模型 2 中的估计维持量较少(五分位 1 与五分位 5)。在模型 1 的残差中,存在着模型 2 残差中没有的有关增重和维持量组成差异的大量信息。从经济角度来看,选择空体脂肪较少的牛可能并不可取。
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引用次数: 0
Effects of steam-flaked corn and wet distillers grains with solubles on energy metabolism of finishing beef steers* 蒸汽压片玉米和带溶质的湿蒸馏谷物对育成肉牛能量代谢的影响*
IF 1.5 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2024-02-01 DOI: 10.15232/aas.2023-02439
Christian H. Ponce , Jenny J. Jennings , Michael S. Brown , Beverly E. Meyer , N. Andy Cole

Objective

Wet distillers grains with solubles (WDGS) are a common feed ingredient used in cattle finishing diets. However, the NE values of WDGS have not been clearly delineated, and there may be an interaction between grain processing method and the feeding value of WDGS. This study was conducted to evaluate the relative NE values of WDGS and to evaluate possible associative effects between WDGS and steam-flaked corn (SFC) on energy and nitrogen utilization by finishing beef steers.

Materials and Methods

Four British crossbred steers were used in a 4 × 4 Latin square design in which steers were fed 1 of 4 diets: (1) a basal 86% concentrate diet fed a 1× maintenance (B), (2) the basal diet + SFC fed at 1.5× maintenance (B+SFC), (3) the basal diet + WDGS fed at 1.5× maintenance (B+WDGS), and (4) the basal diet + a 50:50 blend of WDGS and SFC fed at 1.5× maintenance (BLEND). Each period of the Latin square was 28 d in length with steers confined to indirect open- circuit respiration chambers the last 5 d of each period. Nutrient digestibility, urinary nutrient excretion, methane and carbon dioxide production, and heat production were determined during the last 5 d of each period. Dietary and ingredient (SFC or WDGS) TDN, DE, ME, and NE values were calculated.

Results and Discussion

The digestibility of DM and OM of B+SFC was greater than that of B+WDGS, with the BLEND diet being intermediate. Nitrogen balance was numerically greater for B+WDGS than for B+SFC, with BLEND being intermediate. Digestible energy, ME, and energy retention were greater for B+SFC than for B+WDGS, with BLEND being intermediate. The experi- mental method used affected the TDN, DE, ME, and NE values of diets, SFC, and WDGS. There were negative associative effects (−1% to −8.0%) between SFC and WDGS for energy values. Actual DE:TDN averaged 4.11 Mcal of DE/kg of TDN, which is less than the 4.4 value used by NASEM (2016). The DE:digestible OM ratio av- eraged 4.54 Mcal/kg, and the digestible OM:TDN ratio averaged 90.2.

Implications and Applications

Our results suggest that within the range of rations fed in this study, the NE values for WDGS by NASEM (2016) may overestimate their relative NE (15%) when fed in diets based on SFC.

目的带溶解物的湿蒸馏谷物(WDGS)是牛育成日粮中常用的饲料原料。然而,WDGS 的营养价值尚未得到明确界定,谷物加工方法与 WDGS 的饲用价值之间可能存在相互作用。本研究旨在评估 WDGS 的相对 NE 值,并评估 WDGS 和蒸汽压片玉米(SFC)对育成肉牛能量和氮利用的可能关联效应。材料和方法在 4 × 4 拉丁正方形设计中使用四头英国杂交母牛,母牛饲喂四种日粮中的一种:(1)86% 精饲料基础日粮,饲喂量为 1× 维持量(B);(2)基础日粮 + SFC,饲喂量为 1.5×维持量(B+SFC),(3)基础日粮 + WDGS,1.5×维持量(B+WDGS),以及(4)基础日粮 + WDGS 和 SFC 的 50:50 混合日粮,1.5×维持量(BLEND)。拉丁方格试验的每个阶段为 28 天,每个阶段的最后 5 天将母牛限制在间接开路呼吸室中。在每个阶段的最后 5 天测定养分消化率、尿液养分排泄量、甲烷和二氧化碳产生量以及产热量。结果与讨论B+SFC的DM和OM消化率高于B+WDGS,BLEND日粮介于两者之间。从数值上看,B+WDGS 的氮平衡高于 B+SFC,BLEND 介于中间。B+SFC 的可消化能、ME 和能量保持率高于 B+WDGS,BLEND 处于中间水平。使用的实验方法会影响日粮、SFC 和 WDGS 的 TDN、DE、ME 和 NE 值。SFC 和 WDGS 在能量值方面存在负相关效应(-1% 到 -8.0%)。实际 DE:TDN 平均为 4.11 兆卡路里 DE/千克 TDN,低于 NASEM(2016 年)使用的 4.4 值。我们的结果表明,在本研究中饲喂的日粮范围内,当饲喂基于 SFC 的日粮时,NASEM(2016 年)的 WDGS NE 值可能会高估其相对 NE 值(15%)。
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引用次数: 0
Estimating the daily weight gain of beef stocker cattle grazing bermudagrass as affected by initial age and body condition 放牧百慕草对肉牛日增重的影响
IF 1.5 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2023-12-01 DOI: 10.15232/aas.2023-02428
P. Woli , C.R. Long , L.O. Tedeschi , F.M. Rouquette Jr

Objective

Our objective was to develop an age × BCS factor (ABCf) that could be used to estimate the ADG of stockers grazing bermudagrass (Cynodon dactylon [L.] Pers.) pasture as influenced by their age and BCS at the onset of stocking, hereafter referred to as the initial age and BCS.

Materials and Methods

Data on the ADG of stock- ers grazing bermudagrass in the southern United States were obtained from multiple sources, including literature, for various scenarios of initial age × BCS. Then, an ABCf for each age × BCS scenario was calculated by dividing its ADG by the ADG of calves 7 to 10 mo old with BCS of 5, a standard age × BCS scenario. Finally, an ABCf equa- tion was derived by regressing the ABCf values against the BCS values under each age group.

Results and Discussion

We derived the following ABCf equation to estimate the ADG of a stocker grazing bermudagrass pasture as ADG′ = ADG × ABCf, where and BCS on ADG of stockers grazing bermudagrass pas- ture. Current ADG indices or estimates do not account for the interacting effects of initial age and BCS. By incorpo- rating the ABCf into an ADG prediction system, the scien- tific community and stakeholders can more accurately as- sess the effects of these attributes on animal performance and develop appropriate purchase pricing and supplemen- tation strategies before and during stocking.

目的建立一个年龄× BCS因子(ABCf),用于评价放牧百慕大草(Cynodon dactylon [L.])的平均日增重。[Pers.])放牧受其开始放养时的年龄和BCS的影响,以下简称初始年龄和BCS。材料与方法通过文献等多种资料获取了美国南部放牧百慕大草的不同初始年龄× BCS情景下的平均日增重数据。然后,用平均日增重除以标准日龄×平均日增重为5的7 ~ 10月龄犊牛的平均日增重,计算各日龄×平均日增重。最后,将各年龄组的ABCf值与BCS值进行回归,得到ABCf方程。结果与讨论我们推导出以下ABCf方程来估计一个放牧者放牧百慕大草甸的平均日增重:ADG′= ADG × ABCf,其中和BCS为放牧者放牧百慕大草甸的平均日增重。目前的平均日增重指数或估计值没有考虑初始年龄和BCS的相互作用。通过将ABCf纳入平均日增重预测系统,科学界和利益相关者可以更准确地评估这些属性对动物生产性能的影响,并在放养前和放养期间制定适当的购买定价和补充策略。
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Applied Animal Science
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