农一师新型团场建设的评价指标体系建立及分析

本文通过构建农一师新型团场评价指标体系,来综合评价农一师建设新型团场实现程度,研究分析存在的问题,提出加快新型团场建设的对策及建议。     

猪肉质的评定指标及测定技术

随着生活条件的提高,人们对猪肉品质的追求也不断提高。然而,在非洲猪瘟的巨大冲击下,现代化、集约化养殖企业主要追求数量和生产速度的复工复产,而更多忽略了肉质的选育和提高,导致猪肉肉质总体呈现下降趋势。因此,了解猪肉肉质的评定指标和准确的测定方式,对肉质的客观评定和品种肉质改良速度的提高有直接影响。肉的食用品质主要包括肉的风味、质构、嫩度和多汁性等~([1]),肉质是一个综合性的复杂指标,包括肌肉肉色、pH、嫩度、大理石纹、滴水损失、熟肉率、剪切力、系水力、电导率、挥发性盐基氮和肌内脂肪含量测定等。文内就猪肉肉质的各个评定指标和相应的测定技术进行了阐述。     

转录组学技术及其在猪肉质遗传研究中的应用

转录组学作为研究基因结构和功能的重要内容,在研究细胞生理活动规律、揭示基因表达与生命现象之间的内在联系等方面发挥着重要作用。猪肉作为我国也是全球第一大消费肉类品种,存在广阔的市场需求,关于猪肉品质的研究也是当前猪遗传育种的重点内容。文章就转录组学技术及其在猪肉质研究中的应用进行综述,鉴于当前的研究热点,重点概括基于转录组测序技术的非编码RNA的研究在猪肉质遗传研究中应用现状,以期为猪肉质相关研究提供参考。     

河北省谷子害虫种类调查及防治对策

普查并明确了危害河北省谷子的害虫有8个目20多科30余种，介绍了害虫危害特点及防治对策。     

综合防治在生态农业中的地位

环境污染问题是世界普遍关注的严重问题。在保护环境和维护自然界生态平衡呼声日益高涨的今天，生态农业已成为世界农业发展中的一个新趋势。综合防治是生态农业的组成部分，是保护农业生态环境的重要措施，一切从维护农业生态的动态平衡出发。因此，未来的综合防治将是以农业生态系统的生态防治为主的一项系统工程。     

安徽省一起牛结节性皮肤病的暴发调查

2020年6月28日,安徽省在排查中发现,黄山市休宁县一养牛户饲养的黄牛发生疑似牛结节性皮肤病。安徽省相关部门随即组成专项工作组赴现场开展了暴发调查,并采集牛全血、皮肤结节、鼻/口腔拭子样品进行了PCR检测。综合流行病学特征以及病理剖检、实验室检测结果,并经国家外来动物疫病研究中心复检,证实该暴发是由牛结节性皮肤病病毒感染引起的牛结节性皮肤病。调查推测,本暴发很可能是由虫媒或进出人员、交通工具等带入病毒引起的。建议加强对节肢动物的控制和扑灭,对养殖场、周围河流、农田等区域采取灭蚊、灭蝇措施;加强养殖场的生物安全管理,严格人员及车辆的进出场控制与消毒;全面开展牛结节性皮肤病防治技术的宣传和培训,让养殖户深入了解牛结节性皮肤病,从而更好地开展疫病防控工作。本调查为牛结节性皮肤病的预防与控制提供了参考。     

正螺旋面展开图的几何优化设计

提出了一种正螺旋面解析设计计算方法,按照绝对变形量和相对变形量指标为最小两类目标函数建模,导出了在相应加工条件下的设计计算公式。实际应用结果证实了该设计思想的正确性。     

Ultrasonographic and computed tomographic features of rice bodies in an Arabian horse with atlantal bursitis

A 19‐year‐old castrated Arabian male horse presented for evaluation of a firm mass at the dorsal cervical region. Ultrasonography and computed tomography revealed multiple well defined fusiform structures within the atlantal bursa. Multiple glossy smooth, white to yellowish, flattened fusiform structures were removed surgically. These structures were composed of dense fibrin with some leukocytes and red blood cells. The imaging and histopathological features of these structures were similar to chronic ‘rice bodies’ reported in humans with bursitis or tenosynovitis. This is the first veterinary report describing the imaging features of ‘rice bodies’ in a horse with atlantal bursitis.     

Radiographic and computed tomographic appearance of caseous lymphadenitis in a goat

A 2‐year‐old Boer doe was presented with respiratory distress and severe inspiratory dyspnea. Cervical and thoracic radiographs revealed a marked retropharyngeal soft tissue mass effect, several mineralized pharyngeal and retropharyngeal structures, and a pulmonary mass. Computed tomography (CT) revealed a severely enlarged right medial retropharyngeal lymph node, which caused laryngeal compression, leading to upper airway obstruction. Multiple cervical and thoracic lymph nodes, and the pulmonary mass had an irregular layered/laminated pattern of mineralization. Imaging findings were consistent with caseous lymphadenitis, and further confirmed with culture, necropsy, and histopathology. This is the first report of CT appearance of caseous lymphadenitis in a goat.     

Effects of dietary dihydroartemisinin supplementation on growth performance,hepatic inflammation,and lipid metabolism in weaned piglets with intrauterine growth retardation

The aims of this study were to investigate the effects of dietary supplementation with dihydroartemisinin (DHA) on growth performance, hepatic inflammation, and lipid metabolism in intrauterine growth retardation (IUGR)‐affected weaned piglets. Eight piglets with normal birth weight (NBW) and 16 IUGR‐affected piglets were selected and fed either a basal diet (NBW and IUGR groups) or the basal diet supplemented with 80 mg/kg DHA (IUGR‐DHA group) from 21 to 49 day of age. Blood and liver samples were collected on day 49. DHA supplementation significantly alleviated the compromised growth performance and liver damage in IUGR‐affected piglets. Additionally, DHA supplementation decreased the activities of alanine aminotransferase and aspartate aminotransferase, as well as the serum levels of non‐esterified fatty acids (NEFA), very‐low‐density lipoprotein, and total cholesterol. In the liver, the concentrations of interleukin 1 beta, interleukin 6, tumor necrosis factor alpha, triglycerides, and NEFA were decreased. Fatty acid synthesis was decreased by DHA supplementation, whereas the activities of lipoprotein lipase, hepatic lipase, and total lipase were increased. Dietary DHA supplementation led to upregulation of the expression of AMPK/SIRT1 signaling pathway‐related genes, whereas that of inflammatory factor‐related genes were downregulated. In conclusion, dietary inclusion of 80 mg/kg DHA can alleviate IUGR‐induced impairments in piglets.