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[学术文献] 饲粮中添加半胱胺螯合锌对肥育猪肉品质和氨基酸组成的影响 进入全文

中国知网

本试验旨在研究饲粮中添加半胱胺螯合锌(Zn-CS)对肥育猪体增重、肉品质以及肌肉和血清的氨基酸组成的影响。试验选取体重为(84.6±0.6) kg的杜×长×大三元杂交母猪40头,随机分为4组,每组10头猪,数据以个体为重复。对照组饲喂玉米-豆粕型基础饲粮,试验组饲喂在基础饲粮中分别添加90、180和300 mg/kg Zn-CS的试验饲粮。饲粮中添加合成氨基酸以满足75~100 kg和100~130 kg的肥育猪必需氨基酸的NRC(2012)营养需要,饲养试验38 d。结果表明:1)饲粮中添加Zn-CS对肥育猪平均日增重无显著影响(P>0.05)。2)饲粮中添加Zn-CS显著线性增加了屠宰后24 h背最长肌的亮度(L*)值(P<0.05),对背最长肌的其余肉色指标、pH、大理石花纹评分、系水力和剪切力无显著影响(P>0.05)。3)饲粮中添加Zn-CS显著线性增加了血清中游离谷氨酸、亮氨酸、组氨酸(线性、二次)、赖氨酸、蛋氨酸、半胱氨酸和总游离氨基酸的含量(P<0.05)。4)随着饲粮中Zn-CS添加量的增加,背最长肌中粗蛋白质含量显著线性降低(P<0.05),蛋氨酸含量显著线性增加(P<0.05),而甘氨酸(线性,P<0.05)、丙氨酸(线性,P<0.05)和脯氨酸(二次,P<0.05)含量显著降低。5)饲粮中Zn-CS的添加显著二次增加了背最长肌中游离赖氨酸、丙氨酸、苯丙氨酸、蛋氨酸、风味氨基酸和总游离氨基酸的含量(P<0.05),显著线性降低了游离甘氨酸的含量(P <0. 05)。综上所述,肥育猪饲粮中添加Zn-CS对平均日增重和主要肉品质指标没有显著影响,但可以增加肌肉中的蛋氨酸含量,二次升高肌肉中游离氨基酸的含量,尤其是游离风味氨基酸的含量。90和180 mg/kg Zn-CS组中肌肉游离氨基酸含量最高。饲粮中添加300 mg/kg Zn-CS降低了肌肉中粗蛋白质含量。综合本试验的各项结果,建议肥育猪饲粮的Zn-CS添加量为90~180 mg/kg。

[学术文献] 苜蓿多糖在饲料中的应用 进入全文

中国知网

苜蓿是当今世界分布最广泛的栽培牧草,苜蓿中含有叶蛋白、多糖、黄酮类化合物、膳食纤维等生物活性成分,在生物制药、食品保健和畜牧业生产中具有重要的应用价值。其中多糖是苜蓿中重要的药理及生物活性物质,具有抗病毒、增强免疫力、降血脂、抗肿瘤、抗辐射等生物活性,是一种优良的饲料添加剂。本文综述了苜蓿多糖的提取技术及工艺优化和作为饲料添加剂的最新研究成果,旨在为苜蓿多糖的深入研究和利用提供参考。 

[学术文献] Zinc phosphate-based nanoparticles as alternatives to zinc oxide in diet of weaned piglets 进入全文

Web of Science

Background The high doses of zinc oxide (ZnO) administered orally to piglets for the prevention of diarrhea and increase of growth rate can contaminate pig farms and the surrounding environment. Therefore, there is a need to find a replacement of high doses of dietary ZnO with an equally effective alternative. In the present study, the effect of two formulations of zinc phosphate-based nanoparticles (ZnA and ZnC NPs) on growth performance, intestinal microbiota, antioxidant status, and intestinal and liver morphology was evaluated. A total of 100 weaned piglets were randomly divided into 10 equal groups with the base diet (control) or the base diet supplemented with ZnA, ZnC, or ZnO at concentrations 500, 1000, and 2000 mg Zn per kilogram of diet. Supplements were given to animals for 10 days. Fecal samples were collected on day 0, 5, 10 and 20. At the end of the treatment (day 10), three piglets from each group were sacrificed and analyzed. Results Comparing to that of control, the significantly higher piglet weight gain was observed in all piglet groups fed with ZnA (P < 0.05). Differences in the total aerobic bacteria and coliform counts in piglet feces after NPs supplementation compared to that of control and ZnO groups were also found (P < 0.05). The majority of aerobic culturable bacteria from the feces represented Escherichia (28.57-47.62%), Enterococcus (3.85-35.71%), and Streptococcus (3.70-42.31%) spp. A total of 542 Escherichia coli isolates were screened for the virulence genes STa, STb, Stx2, F4, and F18. The substantial occurrence of E. coli virulence factors was found on day 5, mainly in fimbrillary antigen and thermostable toxins, except for piglets fed by ZnC. Zn treatment decreased Zn blood levels in piglets fed with ZnO and ZnA (500 mg/kg) and increased in ZnC (2000 mg/kg) compared to that of control (P < 0.05). The antioxidant status of piglets was affected only by ZnA. While some changes in the liver and the intestinal morphology of piglets with NPs were observed, none were serious as reflected by the normal health status and increased weigh gain performance. Conclusions Our results indicate that ZnA NPs have a positive effect on the piglet growth performance even at the lowest concentration. The prevalence of E. coli virulence factors was lowest in pigs supplemented with ZnC. Zinc phosphate-based nanoparticles may be an effective alternative to ZnO.  

[学术文献] Early-life lactoferrin intervention modulates the colonic microbiota, colonic microbial metabolites and intestinal function in suckling piglets 进入全文

SpringerLink

Abstract This study reports the effects of early-life lactoferrin (LF) intervention on the colonic microbiota, intestinal function and mucosal immunity in suckling piglets. A total of 60 Duroc × Landrace × Yorkshire suckling piglets from six sows were assigned to the control (CON) and LF groups in litters. The LF group piglets were fed 0.5 g/kg body weight of LF solution per day, and the CON group piglets were fed the same dose of physiological saline for a week. Six piglets from the two groups were randomly chosen and euthanised on days 8 and 21. The LF group piglets had higher ACE and Chao1 indices of colonic microbiota than the CON group piglets (P < 0.05). In addition, the LF group piglets had a higher abundance of Roseburia (P < 0.05) and a lower abundance of Escherichia–Shigella (P < 0.05) in the colonic digesta. The LF group piglets also had a higher concentration of butyrate (P < 0.05) in the colonic digesta. Moreover, the LF group piglets had a higher gene expression of occludin (P < 0.05) in the colonic mucosa. In addition, the gene expression of MUC4 was upregulated in the LF group piglets compared with that in the CON group on day 21 (P < 0.05), and the lower gene expression of TLR-4 was found in the LF group compared with the CON group on day 8 (P < 0.05). Furthermore, the concentration of IL-10 was increased in the LF group on day 8 (P < 0.05), while the LF group piglets had a higher concentration of sIgA and lower concentrations of IL-1α and IL-1β (P < 0.05) in the colonic mucosa. These results suggest that early-life LF intervention can modulate the composition of colonic microbiota and improve the intestinal function in suckling piglets.

[前沿资讯] 农业农村部部署推进畜禽粪污资源化利用项目 进入全文

农业农村部新闻办公室

7月2日,农业农村部召开加快推进畜禽粪污资源化利用项目实施视频会议,通报畜禽粪污资源化利用项目开工情况,进一步明确畜禽粪污资源化利用项目实施要求,对畜禽粪污资源化利用工作进行再动员再部署。农业农村部副部长于康震出席会议并讲话。   会议指出,畜禽粪污资源化利用整县推进项目自实施以来,已经实现畜牧大县全覆盖,为加快推进畜禽粪污资源化利用发挥了重要支撑作用。各地要切实提高政治站位,增强责任感紧迫感,准确把握项目推进要求,切实加快项目实施进度,组织开展项目绩效评价,确保中央资金使用安全,多措并举加力推进项目尽快落地见效,通过项目示范带动打通畜禽粪污资源化利用路径。   会议强调,要牢固树立目标导向,加大工作力度,确保高质量如期完成畜禽粪污资源化利用目标任务。狠抓粪污处理设施配套,逐步提高规模养殖场设施装备水平。狠抓畜禽粪肥还田利用,发展培育粪肥施用社会化服务组织,促进粪肥低成本就地就近还田。狠抓日常监督管理,强化直联直报系统数据填报和审核,加强对粪肥还田适用标准和利用过程管理。狠抓典型宣传引导,总结典型经验和案例,开展多种形式的推介活动。 农业农村部总畜牧师马有祥主持会议,国家首席兽医师李金祥出席会议。

[学术文献] 牛至油替代抗生素和氧化锌对仔猪生长性能、腹泻频率、肠道形态和血浆抗氧化指标的影响 进入全文

中国知网

摘要:本试验旨在研究牛至油替代抗生素和氧化锌对断奶仔猪生长性能、腹泻频率、肠道形态和血浆抗氧化指标的影响。选取48头(21±1)日龄的健康“杜×长×大”断奶仔猪,按体重一致的原则随机分为2组,分别为抗生素组、牛至油组,每组6个重复,每个重复4头猪。抗生素组在基础饲粮中添加氧化锌和抗生素混合物,牛至油组在基础饲粮中添加牛至油。试验期为28 d。结果表明:牛至油替代抗生素和氧化锌显著提高了仔猪断奶后第1~14天的腹泻频率(P <0.05),但对仔猪断奶后第1~14天、第15~28天和第1~28天的平均日增重、平均日采食量、料重比均没有产生显著影响(P>0.05),并使断奶后第1~14天的平均日增重提高9.6%,平均日采食量提高5.5%。牛至油替代抗生素和氧化锌对断奶仔猪十二指肠、空肠、回肠形态均没有产生显著影响(P> 0. 05)。牛至油替代抗生素和氧化锌使断奶后第15天血浆超氧化物歧化酶(SOD)活性和总抗氧化能力(T-AOC)显著提高(P<0.05)。上述结果提示,在本试验条件下,牛至油替代抗生素和氧化锌会显著提高仔猪断奶后第1~14天的腹泻频率,但对整个试验期内的腹泻频率和生长性能没有显著影响,同时还可提高机体的抗氧化性能。

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