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1.
钙是动物体内必需营养元素之一,钙代谢直接关系到畜禽生长和生产潜力的发挥。随着生产性能的大幅提高,因钙代谢引发的相关疾病或问题日益突出,本文从钙的吸收排泄、机体内自主代谢调节及基因调控等方面,对动物钙营养代谢的基因调控进行了分析探讨。 相似文献
2.
钙是鸡体必需的营养素,鸡体内98%的钙存在于骨骼中,钙也是蛋壳的主要组成成分;血液中的钙几乎都存在于血浆中,可参与细胞代谢和血液凝固过程,能维持酶的活性、神经传导和肌肉活动。内分泌激素可影响到钙代谢。钙在鸡体内具有重要的生理作用,同时也与生产性能密切相关。要根据蛋鸡不同的生理阶段适时调整饲料中的钙含量,若钙元素缺乏或过量都会对蛋鸡的健康和生产性能造成不良影响。 相似文献
3.
哺乳动物体内的钙代谢通常包括钙平衡和钙稳态。钙平衡是指体内总钙含量保持相对恒定的状态,钙稳态则指细胞内外的钙离子浓度保持稳定。肾脏、肠道、骨骼及雌性动物乳腺是动物体钙代谢的主要器官,其中存在着许多精细而复杂的调控网络。妊娠期钙代谢紊乱会严重影响母畜及胎儿的营养健康,维持体内钙代谢稳态对围产期哺乳动物尤为重要。本文综合近年来国内外妊娠期哺乳动物钙代谢相关研究,从不同组织器官钙代谢情况及钙代谢过程中重要的调节因子的调控作用进行综述,旨在为妊娠期哺乳动物钙代谢调控相关研究提供思路。 相似文献
4.
钙是动物体内最重要的矿物元素之一,钙参与调节各种机体生命活动.钙代谢是动物体内极为复杂的一种生命活动过程,体内钙代谢平衡受多种因素的影响.从整体调节和基因调节上对钙代谢作简要概况,旨在为维护动物健康生长提供理论依据. 相似文献
5.
鸡的钙营养石矿（山东省菏泽市高庄镇中学２７４０００）鸡的矿物质营养中,钙的需要量最大,而且饲料中钙的含量高低直接影响磷、锌、锰、铜的吸收,对体内镁、铁的代谢也有很大影响。目前,饲料生产中,人们多把注意力集中于微量元素、维生素添加剂,忽视了常量矿物元素... 相似文献
6.
ω-3多不饱和脂肪酸（ω-3 PUFAs），特别是二十碳五烯酸（EPA）和二十二碳六烯酸（DHA）对畜禽脂肪代谢的调控被广泛研究。在禁抗背景下，ω-3 PUFAs作为一种抑制脂肪沉积的饲料添加剂发展潜力巨大。文章综述ω-3 PUFAs的来源及其在体内的代谢以及ω-3 PUFAs对鸡早期脂肪组织发育、基因的转录与转录后调控等途径抑制脂肪沉积的可能机制，并讨论其添加策略，旨在为ω-3 PUFAs在畜禽生产中的应用提供参考。 相似文献
7.
在夏季高温时，鸡的代谢活动加强，外周血液循环加快，机体代谢排泄增强，加之高温时血液酸碱平衡被打破，鸡采食量下降，饮水量增加，导致钙、磷大量流失，使钙、磷浓度降低。同时，高温应激时动物体内的某些激素、酶类及离子平衡变化也影响矿物质的代谢，使得产蛋率下降，蛋形变小，蛋壳变薄、变脆，蛋重减轻，软壳蛋破蛋增多，蛋品质下降，发病率和死亡率明显上升。 相似文献
8.
处于围产期的奶山羊由于血液中钙离子迅速降低极易引发低血钙症,5-羟色胺(5-hydorxytyrptamine,5-HT)可以调节生物体内钙代谢,但具体调节机制尚不明确。该研究通过注射5-羟色氨酸(5-HTP,5-hydroxytryptophan)来增加围产期奶山羊体内的5-HT浓度,采集血液提取RNA后,采用全转录组测序技术筛选鉴定差异表达mRNA、microRNA、LncRNA和CircRNA。通过Metascape对差异表达的基因进行富集分析,发现这些差异表达基因主要参与钙代谢、脂质代谢、免疫反应、细胞凋亡等过程。通过预测转录本之间的结合情况构建LncRNA/CircRNA-microRNA-mRNA的竞争内源性RNA(Competing Endogenous RNA,ceRNA)调控网络,并对网络中的基因进行富集分析发现3个与钙代谢相关的基因,分别是Toll样受体9(Toll Like Receptor 9,TLR9)、缝隙连接蛋白γ2(Gap Junction Protein Gamma 2,GJC2)和连接素1(Junctophilin1,JPH1),LncRNA MSTRG.1354.2可与TLR9竞争性地结合microRNA NC.030825.1_6027,进而调控TLR9的表达,MSTRG.56601.1和MSTRG.101405.3都可以与GJC2、JPH1竞争性地结合NC.030814.1_19917,进而调控GJC2和JPH1的表达。该研究结果为5-HT调控山羊钙代谢提供了一种全新的分子机制。 相似文献
9.
钙与磷是骨的主要成分,在鸡体内矿物质总量中有65—70%是钙和磷的化合物;它们在饲料中的平衡关系,又对其吸收、形成骨骼和蛋壳有很大影响。由于它们在体内生理机能和物质代谢中有着特别重要的意义,因此,钙磷对鸡的营养作用 相似文献
10.
为了探究miR-143基因与脂类代谢靶基因的关系及其在脂类代谢过程中的调控作用以及对武定鸡肝脏组织脂类代谢的调控机制,试验通过靶基因预测软件microRNA.org(http://www.micror-na.org)预测miR-143基因与脂类代谢靶基因的结合位点;选取胚胎期第15天和出生后第1,7,14,28,56天... 相似文献
11.
In late December 1985, 1485 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1985 and 44% of them responded. Veterinarians reported that 137,300 dogs were blood-tested to check for microfilariae and 1210 dogs were found with heartworm. Another 36 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number diagnosed in 1985 as 1247 (0.91%). Heartworm was reported from all provinces except Prince Edward Island, Newfoundland and Saskatchewan but most (1126) of the cases were in Ontario. Southwestern Ontario continued to be the primary focus of the infection in Canada. From Quebec, 91 cases were reported mostly from and around Montreal. From Manitoba, 19 cases were reported from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 28% of the cases were observed with clinical signs of heartworm disease and 78% had a history of not having left Canada. 相似文献
12.
In late November 1988, 1581 small and mixed animal clinics and institutional veterinarians across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1988, and 46% of them responded. Veterinarians reported that 181,577 dogs were blood-tested for heartworm disease and 367 dogs were found with D. immitis microfilariae. Another 60 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1988 as 441 (0.24%). 相似文献
13.
In late December 1984, 1853 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1984 and 35% of them responded. Veterinarians reported that 97,794 dogs were blood-tested to check for microfilariae and 1417 dogs (1.45% of those tested) were found with heartworm. Another 34 dogs were amicrofilaremic, but were diagnosed as having heartworm disease, to give the total number diagnosed in 1984 as 1451 (1.48%). Heartworm was reported from all provinces except Prince Edward Island and Newfoundland but most (1310) of the cases were in Ontario. In Quebec, 126 cases were reported mostly from west of Montreal. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 27% of the cases were observed with clinical signs of heartworm disease and 72% had a history of not having left Canada. Southwestern Ontario continued to be the primary focus of the infection. 相似文献
15.
In late November 1991, 1883 clinics in Canada were sent a questionnaire to assess the status of Dirofilaria immitis in dogs in 1991 and there was a 60.0% response. There were 344,031 dogs tested for heart-worm (HW), 627 were found infected and the prevalence of HW infection was 0.18%. There were 417 dogs with HW in Ontario, 116 in Manitoba, 38 in Quebec, 53 in British Columbia, three in Alberta, and one in Nova Scotia. In British Columbia, all of the infected dogs but one were from the Okanagan valley which, as from 1991, is a new focus of infection in Canada. Most dogs with HW had not been on preventive medication in 1990, and the prevalence among dogs tested and unprotected was 0.59%. That prevalence was considerably higher in endemic areas. Companion dogs, over three years of age and maintained primarily outdoors in rural areas, were most frequently infected. One cat was diagnosed with D. immitis and 33 dogs had Dipetalonema reconditium. 相似文献
16.
In late November 1989, 1732 clinics and institutional veterinarians were sent a questionnaire to assess the status of Dirofilaria immitis, and 51.7% responded. Of 247,716 dogs tested, 394 had D. immitis microfilariae and 51 were amicrofilaremic for a total of 445 cases and heartworm prevalence of 0.17%. Most (408) of these dogs had no preventive medication and the prevalence among dogs tested and unprotected was 1.01%. That prevalence was considerably higher in endemic areas. Thirty-seven dogs with heartworm had preventive medication. Heartworm was most frequent in companion dogs over three years of age maintained outdoors in rural areas. About 75% of the cases had never left Canada, 26% had clinical signs and 125 were not treated. Heartworm was reported from British Columbia, Manitoba, Ontario, Quebec, Nova Scotia and Newfoundland, but 383 cases were in Ontario. South-western Ontario was the primary focus of infection. There were 33 cases in Quebec and 24 in Manitoba, mainly found in and around Metropolitan Montreal and Winnipeg respectively. 相似文献
17.
In late November 1987, 1246 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1987, and 50% of them responded. Veterinarians reported that 165,428 dogs were blood tested for heartworm disease and 511 dogs were found with D. immitis microfilariae. Another 78 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1987 as 589 (0.35%). 相似文献
18.
In late December 1986, 1224 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1986; 46% of them responded. Veterinarians reported that 150,989 dogs were blood-tested for microfilariae and 869 dogs were found with heartworm. Another 65 dogs were amicrofilaremic but diagnosed with heartworm disease and one was found with heartworm at necropsy to give the total number diagnosed in 1986 as 935 (0.62%). Heartworm was reported from Manitoba, New Brunswick, Ontario and Quebec, but most (810) of the cases were from Ontario. South-western Ontario continued to be the primary focus of the infection in Canada. There were 103 cases reported from Quebec, mostly from and around Montreal, and 21 cases from Manitoba, from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 33% of the cases were observed with clinical signs of heartworm disease and 81% had a history of not having left Canada. 相似文献
20.
In late December 1983, 2 800 veterinarians across Canada were sent a questionnaire in order to assess the status of heartworm disease in Canada in 1983 and 26% of them responded. Veterinarians reported that 59 504 dogs were blood-tested to check for microfilariae and 771 dogs (1.30% of those tested) were found with Dirofilaria immitis. Heartworm disease was diagnosed in all provinces except New Brunswick and Newfoundland but most (733) of the cases were in Ontario. Heartworm disease was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 31% of the cases were observed with clinical signs of heartworm disease and 64% had a history of not having left Canada. Southwestern Ontario continues to be the focus of the infection and most of the dogs there had not left the province previously. 相似文献
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