虾蛋白肽对蛋鸡产蛋性能和蛋品质的影响

研究和探讨了虾加工副产物的酶解产物（Enzymatic Hydrolysis Production,EHP）对蛋鸡产蛋率和蛋品质的影响。以虾加工副产物为原料,应用复合生物酶酶解技术制备EHP,选择产蛋率在80%以上的300日龄笼养褐壳蛋鸡288只,随机分成3组,在基础日粮中分别添加0、1.5g/100g、3g/100g虾加工副产物EHP,并替代相应重量的鱼粉,试验期为60天。EHP,可显著提高鸡蛋的哈夫单位（P〈0.05）,试验组蛋鸡产蛋率平均提高3.14%,料蛋比相应低于对照组。表明虾加工副产物EHP可显著提高产蛋高峰期过后处于衰减期的鸡蛋的哈夫单位及产蛋率。     

影响老瓜头泌蜜量主导因素的研究

老瓜头自然分布于沙漠地带。在老瓜头开花期,天气变化无常。我们研究了对老瓜头泌蜜量起关键影响作用的气象因子。根据当地气候的变化规律进行预测预报,指导养蜂者正确选择场地,以夺取老瓜头蜜高产。     

浅析机械自动化在农业及食品包装领域的应用

我国是农业大国,也是食品包装大国,在机械自动化过程中落后于发达国家;近几年来,由于国力增强和科学技术的迅猛发展,机械自动化在此二个领域取得了较大发展。本文概述了近年来机械自动化在农业和食品包装业的发展。     

草原畜牧业产业链利益联结机制影响因素研究

在草原畜牧业产业链的建设过程中,构建稳定、和谐、有效的产业链利益联结机制,是产业链有效运行的必要前提和重要支撑。基于此,对新疆、内蒙古、青海及甘肃的四大典型草原牧区利益联结主体牧户、合作社和龙头企业进行了实地问卷调查,运用结构方程模型对其产业链利益联结机制的影响因素进行了实证分析。研究结果表明,行为表现、畜产品物流特征和合作意愿对产业链利益联结机制有显著的正向影响;经营状况并不能直接影响其产业链的利益联结,而是通过其他3条路径间接影响产业链的利益联结机制;主体的行为表现可以直接和间接影响彼此间的利益联结,畜产品物流特征对于彼此间合作意愿影响是微乎其微的;产业链主体的发展状况、契约关系、分销渠道以及合作预期的认知分别是经营状况、行为表现、畜产品物流特征和合作意愿中对利益联结机制影响最为显著的因素。     

Occurrence of reproductive disorders in pig herds with and without Chlamydia suis infection – statistical analysis of breeding parameters

Chlamydiae are frequently encountered Gram‐negative intracellular eubacteria that can cause clear manifestations or clinically asymptomatic disorders. C. suis and other chlamydia are primarily isolated in cases of reproductive disorders. This study was performed to estimate the impact of Chlamydia suis infection on reproduction in sows by analyzing reproduction rates and breeding parameters. The test was conducted on first generation (F1) pigs from Polish Landrace (PL) × Polish Large White (PLW). Sixty‐four herds were investigated and 500 vaginal swabs were collected. Isolation of DNA was carried out directly from the swabs. All samples were analyzed for Chlamydia suis by real‐time PCR with a locked nucleic acid (LNA)‐containing probe. To analyze the impact of chlamydia infection on reproductive parameters, evaluation questionnaires were used. Reproductive problems were found in 77.3% of the farms tested. The receiver operating characteristic curve indicated that in the farms with 10 up to 120 sows, there were higher reproductive problems with chlamydia infection than in smaller and bigger pig farms. The most common problems were estrus repetition, which was reported by 57.81% of the surveyed farms, and the birth of dead piglets, which was reported by 31.25% of the investigated pig farms. Abortions, which were reported by 28.12% of the surveyed farms, were the least common reproductive disorders.     

鸽新城疫病毒毒价的血凝价,ELD50和TCID50值相关性比较

本文比较了用血凝反应（ＨＡ）,在鸡胚成纤维细胞上的ＴＣＩＤ５０及用发育鸡胚做ＥＬＤ５０来测定鸽新城疫病毒（ＮＤＶ）毒价的相关性。结果表明,鸽ＮＤＶ毒价的ＴＣＩＤ５０和ＥＬＤ５０的值基本相同。ＨＡ滴度虽然与ＴＣＩＤ５０值有一定的相关性,但远不如ＴＣＩＤ５０准确。接种病毒后死亡鸡胚的新鲜尿囊液经冻融后,其中鸽ＮＤＶ的ＨＡ滴度和ＴＣＩＤ５０均逐渐下降。每经一次冻融,毒价几乎减少５０％。