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Whole blood immune gene expression in Angus bulls with divergent residual feed intake expected progeny differences 不同剩余采食量安格斯公牛全血免疫基因表达预期后代差异
IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2025-06-01 DOI: 10.15232/aas.2024-02645
Yarahy Leal , Samanthia Johnson , Modoluwamu Idowu , Taylor Sidney , Deborah Ologunagba , Ibukun M. Ogunade

Objective

Our objective was to examine the differ- ences in the whole blood mRNA expression profiles of im- mune-related genes in Angus bulls with either negative or positive residual feed intake expected progeny differences (RFI-EPD).

Materials and Methods

Twenty Angus bulls with the most negative (n = 10; RFI-EPD = −0.29) and most positive (n = 10; RFI-EPD = 0.26) RFI-EPD values were selected from a group of 106 Angus bulls (average BW = 376 ± 36 kg; 370 ± 1.3 d of age) after a 78-d feed ef- ficiency testing period. At the end of this testing period, blood samples were collected for RNA extraction followed by the mRNA expression analysis of 84 genes involved in innate and adaptive immunity using pathway-focused PCR-based arrays. Differentially expressed genes (DEG) were determined using false discovery rate (FDR) ≤0.10.

Results and Discussion

Results from the analysis revealed a total of 5 DEG (FDR ≤0.10) in bulls with divergent RFI-EPD values. We found IL23A to be up- regulated, whereas IL18, TRAF6, TLR2, and MX1 were downregulated in negative RFI-EPD bulls, compared with the positive group. Gene ontology analysis of the DEG indicated the enrichment of different biological pathways linked to innate immune response, NF-κB signaling, cy- tokine and T cell regulation, lipopolysaccharide-mediated signaling pathway, and cellular response to bacteria.

Implications and Applications

These findings re- vealed that negative RFI-EPD bulls exhibit mRNA ex- pression of genes directly related to immune cell function and biological pathways involved in the activation of anti- microbial mechanisms, pathogen recognition mechanisms, and inflammatory response.
目的研究剩余采食量预期后代差异(RFI-EPD)阴性和阳性的安格斯公牛全血免疫相关基因mRNA表达谱的差异。材料与方法20头阴性安格斯公牛(n = 10;RFI-EPD =−0.29),阳性最多(n = 10;RFI-EPD = 0.26)选取安格斯公牛106头(平均体重= 376±36 kg;在78 d的饲料效率试验期结束后,饲喂期为370±1.3 d。在测试期结束时,采集血液样本进行RNA提取,然后使用基于途径聚焦pcr的阵列分析84个参与先天免疫和适应性免疫的基因的mRNA表达。采用错误发现率(FDR)≤0.10测定差异表达基因(DEG)。结果和讨论分析结果显示,RFI-EPD值不同的公牛共5 DEG (FDR≤0.10)。我们发现,与RFI-EPD阳性组相比,阴性RFI-EPD公牛的IL23A上调,而IL18、TRAF6、TLR2和MX1下调。基因本体论分析表明,DEG富集了与先天免疫应答、NF-κ b信号通路、细胞因子和T细胞调控、脂多糖介导的信号通路以及细胞对细菌应答相关的不同生物通路。这些发现揭示了RFI-EPD阴性公牛表现出与免疫细胞功能和生物途径直接相关的mRNA表达,涉及抗微生物机制、病原体识别机制和炎症反应的激活。
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引用次数: 0
Evaluation of the use of beef semen on dairy operations: A survey of Idaho dairies 牛肉精液在奶制品生产中的应用评价:爱达荷州奶制品的调查
IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2025-06-01 DOI: 10.15232/aas.2025-02660
P.S. Smith , J.B. Glaze Jr , H. Tejeda , J. Piaskowski , R.J. Collier , M. Chahine

Objective

The aim of this study was to survey current Idaho dairies on their use of beef semen and gain insights into the criteria and decisions made on farm.

Materials and Methods

A mail-in survey was sent to all registered Idaho dairies (n = 369). The survey consisted of 40 questions consisting of multiple choice, ranking, and open answer styles. The survey was mailed on August 8, 2022, with a reminder postcard sent on October 8, 2022, to dairies that had not returned the initial survey. The survey was mailed a second time on November 5, 2022, to all the dairies that had not responded to the initial survey. Responses were categorized by dairy herd size and region within Idaho.

Results and Discussion

We had a total response rate of 14.1%; of the dairies that responded, 78.8% breed a portion of their herd to beef semen. The use of beef semen was significantly affected by dairy herds size. “Failure to conceive” was ranked most important when deciding which cows were bred to beef, followed by “milk production.” Black Angus was the most chosen breed of a sire, followed by Charolais. Dairies ranked the “breeding service picks the bulls” as most important when selecting beef sires, followed by “calving ease” and “semen cost.” Only 26.8% of dairies raise their own beef × dairy calves, and 69.4% sell the beef × dairy calves as day-old calves. The economic benefit of breeding to beef was evident, with the average price for beef × Holstein, beef × Jersey, and beef × Holstein × Jersey being 3.14×, 1.36×, and 4× that for pure dairy, respectively.

Implications and Applications

These results add knowledge regarding the on-farm decision when breeding dairy cattle to beef sires. This will help guide future research in beef × dairy animals by keeping on-farm decisions in mind.
目的本研究的目的是调查目前爱达荷州奶牛场对牛肉精液的使用情况,并深入了解农场的标准和决策。材料与方法向所有注册的爱达荷州奶牛场(n = 369)邮寄调查问卷。该调查由40个问题组成,包括多项选择,排名和开放式回答方式。该调查于2022年8月8日寄出,并于2022年10月8日向未退还初始调查的奶牛场发送提醒明信片。该调查于2022年11月5日第二次邮寄给所有没有回应第一次调查的乳制品公司。回应按奶牛群规模和爱达荷州的地区分类。结果与讨论总有效率为14.1%;在接受调查的奶牛场中,78.8%的奶牛场用牛肉精液喂养了一部分奶牛。牛精液的利用受奶牛群规模的显著影响。在决定哪些奶牛被培育成牛肉时,“怀孕失败”被列为最重要的因素,其次是“产奶量”。黑安格斯是最受欢迎的品种,其次是夏洛莱。奶牛场在选择牛肉品种时最看重的是“繁育服务挑选公牛”,其次是“产犊难易程度”和“精液成本”。只有26.8%的奶牛场自己饲养牛乳小牛,69.4%的奶牛场将牛乳小牛作为日龄小牛出售。养殖对牛肉的经济效益明显,牛×荷斯坦、牛×泽西、牛×荷斯坦×泽西的均价分别是纯乳均价的3.14倍、1.36倍和4倍。启示和应用这些结果增加了关于将奶牛培育成肉牛的农场决策的知识。这将有助于通过牢记农场决策来指导未来对牛肉和奶牛的研究。
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引用次数: 0
"June" Cover “6月”封面
IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2025-06-01 DOI: 10.1016/S2590-2865(25)00044-8
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引用次数: 0
Effects of combining value-added programs on sale prices of calf lots sold through the Superior Livestock Auction 结合增值方案对通过优质牲畜拍卖出售的小牛批次销售价格的影响
IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2025-06-01 DOI: 10.15232/aas.2024-02638
V. Horton , G.T. Tonsor , J.P. Hutcheson , N. Cernicchiaro , L.M. Horton , D.G. Renter

Objective

(1) Estimate sale prices of calf lots sold through the Superior Livestock Auction (SLA) with differ- ent combinations of value-added program claims (COM- BO), and (2) compare results from 2 models for estimating prices.

Materials and Methods

Data included lots of heifers, steers, or mixed-sex calves, averaging 113 to 365 kg, sold from US$50 to $300/45.4 kg, containing 5 to 5,000 home- raised, nonbreeding animals of US origin. Holstein and Holstein-mixed breed, and feeder lots were excluded. Sale channels included country page, internet, private treaty, or video sales. Linear mixed models estimated effects of value-added programs (VAP) for vaccination protocols (VAC24, VAC34(+), VAC45(+), VAC60; full descriptions of each of these Superior Livestock Auction protocols can be found at https://superiorlivestock.com/value-added-programs), non-hormone-treated cattle (NHTC), Beef Quality Assurance (BQA), and Global Animal Partner- ship (GAP), on sale prices, controlling for sex, weight, region, and sale month.

Results and Discussion

Data from 12,158 calf lots sold through SLA in 2019 and 2020 were analyzed. Prices were significantly associated with VAP combina- tion, but dependent on sex (sex × COMBO). Region and weight also significantly affected sale prices. Calf lots with VAC45, NHTC, with or without BQA, and GAP received the highest prices, whereas VAC24 only, VAC34 only, and VAC34 with BQA (no NHTC or GAP) received equal or lower prices than no VAP, regardless of sex. Both regres- sion models supported similar interpretations when con- sidering these specific VAP combinations.

Implications and Applications

Understanding the marginal impacts of VAP combinations may help produc- ers make informed decisions for profitable management and marketing strategies. Producers should consider whether expected VAP premiums outweigh added costs.
目的(1)估计不同增值程序索赔(COM- BO)组合下通过优质牲畜拍卖(SLA)出售的小牛批的销售价格,(2)比较两种估计价格模型的结果。资料和方法资料包括大量小母牛、阉牛或雌雄混合的小牛,平均体重113至365公斤,每45.4公斤售价50至300美元,其中包括5至5000头美国本土饲养的非繁殖动物。排除荷斯坦和荷斯坦混合品种,以及饲养小区。销售渠道包括国家网页、互联网、私人条约或视频销售。线性混合模型估计了增值程序(VAP)对疫苗接种方案的影响(VAC24, VAC34(+), VAC45(+), VAC60;这些高级牲畜拍卖协议的详细描述可在以下网站找到:https://superiorlivestock.com/value-added-programs)、非激素处理牛(NHTC)、牛肉质量保证(BQA)和全球动物合作伙伴(GAP),包括销售价格、性别、体重、地区和销售月份的控制。结果和讨论分析了2019年和2020年通过SLA销售的12,158头小牛的数据。价格与VAP组合显著相关,但依赖于性别(性别× COMBO)。地区和重量也显著影响销售价格。含有VAC45、NHTC、有或没有BQA和GAP的小牛批次获得最高的价格,而只有VAC24、只有VAC34和只有BQA(没有NHTC或GAP)的VAC34的价格与没有VAP的价格相同或更低,不分性别。当考虑这些特定的VAP组合时,两种回归模型都支持类似的解释。含义和应用了解VAP组合的边际影响可以帮助生产商为盈利管理和营销策略做出明智的决策。生产商应考虑预期的VAP溢价是否大于增加的成本。
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引用次数: 0
Culture- and polymerase chain reaction–based prevalence of bacterial pathogens in liver abscesses and ruminal wall tissues of beef-on-dairy feedlot cattle fed finishing diets with no additives, tylosin, or antibiotic alternatives to control liver abscesses* 以培养和聚合酶链反应为基础,研究饲喂育肥牛的肝脏脓肿和瘤胃壁组织中细菌病原体的患病率,这些牛饲喂不添加添加剂、泰络菌素或抗生素替代品来控制肝脏脓肿*
IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2025-06-01 DOI: 10.15232/aas.2025-02678
Mina Abbasi , Reese Wilson , Alyssa Deters , Xiaorong Shi , Leigh Ann George , Dale R. Woerner , Miles Theurer , Raghavendra G. Amachawadi , T.G. Nagaraja

Objective

Our objectives were to investigate the prevalence and concentrations of major bacterial pathogens associated with liver abscesses and ruminal epithelial tissues of beef-on-dairy heifers fed finishing diets containing no additives (negative control), tylosin, or a probiotic (yeast) and zeolite combination to control liver abscesses.

Materials and Methods

A total of 74 liver abscesses and 69 ruminal epithelial tissues, collected at slaughter, were subjected to culture-based methods to isolate 5 bacterial species, Fusobacterium necrophorum ssp. necrophorum, F. necrophorum ssp. funduliforme, Trueperella pyogenes, Salmonella enterica, and Escherichia coli, and to a quantitative PCR (qPCR) assay to determine prevalence and concentrations of the 2 F. necrophorum subspecies. Statistical analyses included Fisher’s exact test for prevalence and ANOVA for bacterial concentrations to compare the treatment groups.

Results and Discussion

Both culture method and qPCR assay indicated that the ssp. necrophorum was the dominant pathogen, and the prevalence tended to be greater in the negative control group than in the tylosin or yeast-plus-zeolite groups. The prevalence of ssp. funduliforme was not different between the treatment groups. Concentrations of both subspecies were in log 6 to 7 cfu/g and were not affected by treatment. The prevalence of T. pyogenes and S. enterica were low, but the prevalence of E. coli was high. A total of 5 liver abscesses were negative for both subspecies, suggesting that 6% of abscesses were caused by pathogens other than F. necrophorum. In ruminal tissues, the prevalence of ssp. funduliforme was greater than the ssp. necrophorum.

Implications and Applications

The combination of culture method and qPCR assay provided complementary assessment of the prevalence of the major pathogens in liver abscesses of beef-on-dairy cattle, which was similar to that of liver abscesses in cattle of beef breeds. This is the first study that used a qPCR assay to detect and quantify the 2 subspecies of F. necrophorum in liver abscesses.
我们的目的是调查与肝脓肿和瘤胃上皮组织相关的主要细菌病原体的患病率和浓度,在饲喂不含添加剂(阴性对照)、泰乐蛋白或益生菌(酵母)和沸石组合的育肥牛饲粮中,以控制肝脓肿。材料与方法对屠宰时收集的74个肝脓肿和69个瘤胃上皮组织进行培养,分离出坏死梭杆菌5种细菌。necrophorum;真菌、化脓性真杆菌、肠炎沙门氏菌和大肠杆菌,以及定量PCR (qPCR)测定2种坏死菌亚种的流行率和浓度。统计分析包括Fisher的流行率精确检验和细菌浓度方差分析来比较治疗组。结果与讨论培养法和qPCR检测均表明:Necrophorum为优势病原菌,阴性对照组的患病率高于tylosin或酵母+沸石组。ssp的流行。各组间眼底成形无明显差异。两个亚种的浓度都在6 ~ 7 cfu/g之间,不受处理的影响。化脓性乳杆菌和肠链球菌的流行率较低,而大肠杆菌的流行率较高。共有5例肝脓肿在两个亚种中均呈阴性,表明6%的肝脓肿是由坏死芽孢杆菌以外的病原体引起的。在瘤胃组织中,ssp的患病率。基底形成大于ssp。necrophorum。意义与应用培养法与qPCR法相结合,对奶牛肝脓肿中主要病原菌的流行情况进行了补充评估,结果与肉牛肝脓肿的流行情况相似。这是首次使用qPCR检测和定量肝脓肿中坏死孢子虫的2个亚种的研究。
{"title":"Culture- and polymerase chain reaction–based prevalence of bacterial pathogens in liver abscesses and ruminal wall tissues of beef-on-dairy feedlot cattle fed finishing diets with no additives, tylosin, or antibiotic alternatives to control liver abscesses*","authors":"Mina Abbasi ,&nbsp;Reese Wilson ,&nbsp;Alyssa Deters ,&nbsp;Xiaorong Shi ,&nbsp;Leigh Ann George ,&nbsp;Dale R. Woerner ,&nbsp;Miles Theurer ,&nbsp;Raghavendra G. Amachawadi ,&nbsp;T.G. Nagaraja","doi":"10.15232/aas.2025-02678","DOIUrl":"10.15232/aas.2025-02678","url":null,"abstract":"<div><h3>Objective</h3><div>Our objectives were to investigate the prevalence and concentrations of major bacterial pathogens associated with liver abscesses and ruminal epithelial tissues of beef-on-dairy heifers fed finishing diets containing no additives (negative control), tylosin, or a probiotic (yeast) and zeolite combination to control liver abscesses.</div></div><div><h3>Materials and Methods</h3><div>A total of 74 liver abscesses and 69 ruminal epithelial tissues, collected at slaughter, were subjected to culture-based methods to isolate 5 bacterial species, <em>Fusobacterium necrophorum</em> ssp. <em>necrophorum</em>, <em>F. necrophorum</em> ssp. <em>funduliforme</em>, <em>Trueperella pyogenes</em>, <em>Salmonella enterica</em>, and <em>Escherichia coli</em>, and to a quantitative PCR (qPCR) assay to determine prevalence and concentrations of the 2 <em>F. necrophorum</em> subspecies. Statistical analyses included Fisher’s exact test for prevalence and ANOVA for bacterial concentrations to compare the treatment groups.</div></div><div><h3>Results and Discussion</h3><div>Both culture method and qPCR assay indicated that the ssp. <em>necrophorum</em> was the dominant pathogen, and the prevalence tended to be greater in the negative control group than in the tylosin or yeast-plus-zeolite groups. The prevalence of ssp. <em>funduliforme</em> was not different between the treatment groups. Concentrations of both subspecies were in log 6 to 7 cfu/g and were not affected by treatment. The prevalence of <em>T. pyogenes</em> and <em>S. enterica</em> were low, but the prevalence of <em>E. coli</em> was high. A total of 5 liver abscesses were negative for both subspecies, suggesting that 6% of abscesses were caused by pathogens other than <em>F. necrophorum</em>. In ruminal tissues, the prevalence of ssp. <em>funduliforme</em> was greater than the ssp. <em>necrophorum</em>.</div></div><div><h3>Implications and Applications</h3><div>The combination of culture method and qPCR assay provided complementary assessment of the prevalence of the major pathogens in liver abscesses of beef-on-dairy cattle, which was similar to that of liver abscesses in cattle of beef breeds. This is the first study that used a qPCR assay to detect and quantify the 2 subspecies of <em>F. necrophorum</em> in liver abscesses.</div></div>","PeriodicalId":8519,"journal":{"name":"Applied Animal Science","volume":"41 3","pages":"Pages 162-175"},"PeriodicalIF":1.4,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144263199","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Call for Submissions 征集意见书
IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2025-06-01 DOI: 10.1016/S2590-2865(25)00049-7
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引用次数: 0
Bacillus spp. supplementation stimulates the growth of preweaning bull calves offered milk replacer and pelleted starter supplement 乳代用品和颗粒状发酵剂均能促进断奶前公牛犊牛的生长
IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2025-03-24 DOI: 10.15232/aas.2024-02626
Giuseppe Copani , Kimberley Morrill , Oscar C.M. Queiroz , Bruno I. Cappellozza

Objective

In 2 experiments, the objective was to evaluate the effects of supplementing a Bacillus-based direct-fed microbial (DFM) on growth rates of preweaning dairy bull calves.

Materials and Methods

In experiment (Exp.) 1, 62 Holstein-Friesian bull calves were ranked by initial BW and assigned to (1) no DFM supplementation (n = 31; CON) or (2) supplementation of a Bacillus-based DFM in the milk replacer and pelleted feed (n = 31; DFM). Throughout the study, calves were housed individually, milk replacer was offered twice daily with equal amounts being offered twice daily following a programmed feeding. Starting on wk 3 of the study, pelleted feed was offered in controlled amounts to all calves, whereas corn silage and lucerne hay were offered ad libitum. In Exp. 2, 52 Holstein-Friesian bull calves were assigned to the same treatments as reported in Exp. 1 and maintained in group pens, with individual milk and solid feed intake recordings. All data were analyzed with the MIXED procedure of SAS (version 9.4), using calf as the experimental unit.

Results and Discussion

In Exp. 1, DFM-fed bull calves were heavier versus CON on d 42 and 63 of the study. A similar treatment × day interaction tended to be observed for ADG, so that ADG was greater in DFM from d 21 to 42 and tended to be greater from d 0 to 63. Similarly, in Exp. 2, calves fed DFM were heavier on d 56 (treatment × day interaction). For ADG, DFM-fed bull calves had a greater ADG from d 28 to 56 and 0 to 56. Daily pellet intake and G:F for calves fed milk replacer were greater for DFM-fed calves.

Implications and Applications

In summary, feeding a Bacillus-based DFM improved growth rates of low-risk, preweaning Holstein-Friesian bull calves, while also positively affecting milk and solid feed intake. These results indicate that bacterial-based DFM are a feasible strategy to promote the growth rate of calves offered milk replacer preparations.
目的在2个试验中,研究添加芽孢杆菌直接饲喂微生物(DFM)对断奶前奶牛犊牛生长速率的影响。材料与方法在试验(Exp.) 1中,选取62头荷斯坦-弗里西亚公牛犊牛,按初始体重排序,分为(1)不添加DFM组(n = 31;CON)或(2)在代乳剂和颗粒饲料中添加芽孢杆菌基DFM (n = 31;DFM)。在整个研究过程中,小牛被单独饲养,每天两次提供等量的代用品,每天两次按照程序喂养。从研究的第3周开始,所有犊牛均按控制量饲喂颗粒饲料,而玉米青贮饲料和苜蓿干草则随意饲喂。在试验2中,52头荷斯坦-弗里西亚公牛犊牛被分配到与试验1相同的处理中,并在群栏中饲养,单独记录牛奶和固体饲料的摄取量。所有数据以小牛为实验单位,采用SAS (version 9.4)的MIXED程序进行分析。结果与讨论在实验1中,在研究的第42天和第63天,dfm喂养的公牛犊牛比CON更重。ADG也存在类似的处理×日交互作用,即在DFM中,ADG在第21 ~ 42天更大,在第0 ~ 63天更大。同样,在实验2中,犊牛在第56天(处理×日交互作用)时体重更重。在日增重方面,28 ~ 56天和0 ~ 56天dfm喂养的公牛日增重较大。犊牛日颗粒摄取量和G:F均高于代乳犊牛。综上所述,饲喂以芽状杆菌为基础的DFM提高了低风险、断奶前荷斯坦-弗里西亚公牛犊牛的生长速度,同时也对牛奶和固体饲料采食量产生了积极影响。由此可见,以细菌为基础的DFM是促进犊牛生长的一种可行策略。
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引用次数: 0
Corrigendum to “Effects of select tannin-free grain sorghum varieties on the performance, carcass traits, intestinal morphology, and gene expression of jejunal mucosa of broiler chickens” (Appl. Anim. Sci. 38: 592–606) “精选无单宁高粱品种对肉鸡生产性能、胴体性状、肠道形态和空肠黏膜基因表达的影响”的勘误表(苹果。动画。科学通报38:592-606)
IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2025-03-24 DOI: 10.15232/aas.2025-41-2-0146
Alissa H. Moritz, William C. Bridges, Stevin Wilson, Michael E. Blair, Robert E. Buresh, James R. Strickland, Mireille Arguelles-Ramos
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引用次数: 0
Predicting methane emissions from feedlot cattle and application of prediction equations to a synthetic feedlot steer population 饲养场牛甲烷排放预测及预测方程在综合饲养场牛种群中的应用
IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2025-03-24 DOI: 10.15232/aas.2024-02664
M.L. Galyean , K.E. Hales , B.P. Holland

Objective

Our objectives were to develop equations to predict CH4 emissions specific to feedlot cattle and to apply the equations we derived to a synthetic population of feedlot steers created from a commercial database of close-out data.

Materials and Methods

We built a database from the published literature of 98 treatment means from 32 studies that included measures of enteric CH4 emissions and diet composition in cattle fed feedlot-type diets. Enteric CH4 emissions averaged 93.2 g/d, with a mean DMI of 6.6 kg/d, and TDN, NDF, and starch concentrations averaging 82.9%, 20.5%, and 48.5%, respectively. Stepwise regression was used to screen potential dietary variables related to daily CH4 emissions, followed by mixed-model regression to adjust prediction equations for the random effects of study. Close-out data from 3,483 lots of native steers obtained from commercial feedlots in the High Plains region were used to develop a synthetic multivariate normal population of feedlot steers for application of resulting prediction equations.

Results and Discussion

Two regression equations were derived from the database to predict CH4 emissions (g/d): one that included only DMI, and one with DMI and TDN. A third equation that included only TDN was derived to predict CH4 emissions as grams/kilogram of DMI. In addition to regression equations, the use of the database average (adjusted for random effects of study) of 14.11 g of CH4/kg of DMI also was evaluated. Based on resampling analyses of observed versus predicted values, the equation with both DMI and TDN yielded a lower prediction error (24.7 g/d) and greater r2 (0.622) than the DMI-only equation (30.8 g/d and 0.461, respectively). Using the database average of 14.11 g of CH4/kg of DMI gave similar results to the DMI-only regression equation. When applied to the synthetic feedlot steer population, mean, minimum, and maximum daily CH4 emissions were 111.2, 64.7, and 183.3 g/d, respectively, for the DMI plus TDN regression equation.

Implications and Applications

The regression equations we developed, which use commonly available animal and diet information, can be applied to commercial feedlot data to monitor enteric CH4 emissions. As additional CH4 emission data from cattle fed typical feedlot diets become available, our equations can be updated to provide more accurate and precise predictions.
我们的目标是建立方程来预测饲养场牛特有的CH4排放,并将我们导出的方程应用于从商业关闭数据数据库创建的饲养场阉牛的合成种群。材料和方法我们从32项研究的98种处理方法的已发表文献中建立了一个数据库,这些研究包括饲喂饲养场型日粮的牛的肠道CH4排放和日粮组成的测量。肠道CH4排放量平均为93.2 g/d,平均DMI为6.6 kg/d, TDN、NDF和淀粉浓度平均分别为82.9%、20.5%和48.5%。采用逐步回归筛选与日CH4排放相关的潜在膳食变量,然后采用混合模型回归调整研究随机效应的预测方程。从高平原地区的商业饲养场获得的3,483批本地阉牛的关闭数据用于开发饲养场阉牛的综合多元正态种群,以应用所得预测方程。结果与讨论从数据库中导出了两个预测CH4排放量(g/d)的回归方程:一个只包含DMI,一个包含DMI和TDN。第三个方程只包括TDN,以克/千克DMI来预测CH4排放量。除回归方程外,还评估了数据库平均值14.11 g CH4/kg DMI的使用情况(根据研究的随机效应进行了调整)。通过对观测值和预测值的重新采样分析,与仅使用DMI的方程(分别为30.8 g/d和0.461)相比,同时使用DMI和TDN的方程的预测误差(24.7 g/d)更低,r2(0.622)更大。使用数据库平均14.11 g CH4/kg DMI得到与仅DMI回归方程相似的结果。DMI + TDN回归方程的CH4日平均排放量为111.2 g/d,最小排放量为64.7 g/d,最大排放量为183.3 g/d。我们开发的回归方程使用常见的动物和饮食信息,可以应用于商业饲养场数据,以监测肠道CH4排放。随着以典型饲养场饲料喂养的牛的更多CH4排放数据的获得,我们的方程可以更新,以提供更准确和精确的预测。
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引用次数: 0
Effects of inclusion of urea and wet distillers grains with solubles in diets based on dry-rolled corn on heifer performance and carcass characteristics 干滚玉米日粮中添加尿素和湿酒糟及可溶物对犊牛生产性能和胴体特性的影响
IF 1.4 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Pub Date : 2025-03-24 DOI: 10.15232/aas.2024-02612
Brad M. Boyd , Bryan W. Neville , Kristin E. Hales , Andrew P. Foote , Steven D. Shackelford , Galen E. Erickson

Objectives

The objective of this study was to evaluate the effects of urea and wet distillers grains with solubles (WDGS) inclusion on heifer growth performance and carcass characteristics.

Materials and Methods

Crossbred heifers (n = 96) were used to study the effects of 2 inclusion levels of both WDGS and urea in a finishing diet based on dry-rolled corn on performance and carcass characteristics. Heifers were individually fed using a Calan gate system with a 2 × 2 factorial arrangement of treatments. Factors were inclusion of WDGS at either 10% or 20% of diet DM and dietary urea at a concentration of either 0.2% or 1.2% DM basis. Cattle were stratified by BW and assigned randomly to treatment. Blood samples were collected at 3 time points during the feeding period and analyzed for plasma urea nitrogen content. The statistical model included urea and WDGS inclusions and their interactions as fixed effects.

Results and Discussion

There were no interactions between WDGS and urea inclusion for any performance or carcass characteristics, so only main effects are discussed. There were no differences for final BW, ADG, and G:F on a live or carcass-adjusted basis for either urea or WDGS inclusion in the diet. Dry matter intake was less with increased urea inclusion; however, WDGS inclusion did not influence DMI. No differences were observed for any carcass characteristics because of urea or WDGS inclusion. Plasma urea nitrogen was greater for cattle as either urea or WDGS inclusion increased.

Implications and Applications

These data would suggest that when feeding diets based on dry-rolled corn, adding urea beyond that of the 0.2% treatment is not necessary when at least 10% WDGS is included in the diet
目的研究尿素和湿酒糟混溶物(WDGS)对犊牛生长性能和胴体性状的影响。材料与方法以96头杂交小母牛为试验对象,研究干滚玉米育肥期饲粮中添加2种水平WDGS和尿素对生产性能和胴体性状的影响。小母牛采用卡兰门饲喂,2 × 2因子处理。影响因素包括:在饲粮中添加10%或20%日干物质的WDGS,在饲粮中添加0.2%或1.2%日干物质的尿素。按牛体重分层,随机分配处理。在饲养期内的3个时间点采集血液,分析血浆尿素氮含量。统计模型包括尿素和WDGS包裹体及其相互作用作为固定效应。结果与讨论WDGS与尿素包合物之间没有相互作用,因此只讨论了主要影响。无论在饲料中添加尿素还是WDGS,在活体或胴体调整的基础上,最终体重、平均日增重和G:F均无差异。干物质采食量随尿素包裹量的增加而减少;然而,WDGS的加入对DMI没有影响。未观察到尿素或WDGS对任何胴体特性的影响。血浆尿素氮随尿素或WDGS含量的增加而增加。这些数据表明,当饲粮中WDGS含量至少为10%时,在以干轧玉米为基础的饲粮中,无需在0.2%处理基础上添加尿素
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Applied Animal Science
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