提高种鹅产蛋率的途径和方法

养种鹅就是希望鹅能多产蛋,从而可以提高经济效益。从生产实际来看,要提高种鹅的产蛋率,就必须从种鹅的选择入手,加强鹅各阶段的饲养管理,控制好鹅生长发育过程所需的适宜温度、湿度、光照等环境条件,提供种鹅繁殖所需的能量、蛋白、矿物质、维生素等营养物质。     

发改委:生猪价格二季度后可能大幅下跌

<正>国家发改委相关负责人近日预测,近期部分主产省生猪价格已出现明显下跌的苗头,预计二季度以后生猪供给会进一步增加,价格可能再次大幅度下跌。发改委有关负责人表示,近期,受生产周期性波动影响,生猪生产恢复较快,生猪、能繁母猪存栏量显     

填喂朗德鹅育肥肝饲料的选择与配制

朗德鹅腹体长,颈粗短,个体大,增重快(10周龄达4.6千克以上),多肝性能极佳,是国际著名的产肝鹅种.为此,它对饲料的需求尤为重要.     

种鸡产蛋期过度交配的体表特征

种鸡群如果公鸡过多就容易出现过度交配现象,可导致鸡群的受精率、产蛋率和孵化率明显降低。在公母混群的早期,某些种母鸡头部及尾根部羽毛移位、磨损是正常的,但当这种情况进一步发展到羽毛脱落,就是一种过度交配的信号。如果公母比例不减少,这种情况将进一步恶化,并会引起种母鸡背部大面积脱毛,被抓破、撕破皮肤,造成种母鸡体况下降,产蛋率降低。     

如何选购种蜂王

养好蜂并不容易,每个养蜂者都希望自己的蜂群强壮,这样才能高产增收。蜂产品产量除受地理位置、气候、蜜源条件以及饲养技术等因素影响外,饲养对路的蜂种应该是首要的因素。在此谈谈我选购蜂王的观点和意见：     

科学保护中华蜜蜂

一、保护中华蜜蜂刻不容缓 中华蜜蜂是我国宝贵的蜂种资源,中华蜜蜂影响着整个与之相关的植物共生生态系统的变化。中华蜜蜂遗传资源处于灭绝的高度危险之中,拯救和保护中华蜜蜂刻不容缓,对其进行妥善保存、深入研究、充分利用是非常重要和迫切的。中华蜜蜂作为中国蜂业的一大瑰宝,2006年6月2日国家农业部发布公告将中华蜜蜂列入国家级畜禽遗传资源保护名录之中,已得到了国家的重视。     

影响种公牛利用年限的因素

优良的种公牛对牛群的发展和改良提高起着极其重要的作用。尤其在人工授精和冷冻精液日益普及的今天更为重要。饲养具有健壮的体质,充沛的精力并能生产大量品质优良的精液的种公牛,延长其使用年限,并且将其优良性状稳固地传给后代意义重大〔1〕。因此,应尽量延长种公牛的利用年限,使其发挥最大作用。但     

种鹅的高产饲养管理措施

1种鹅的临产特征羽毛紧凑有光泽,尾羽严直;后腹宽大而下垂、松软且有弹性,耻骨间距宽;喜欢吃矿物质饲料如贝壳、田螺壳、石灰石、煤灰渣等;母鹅在公鹅身边点头寻求交配,行动缓慢,性情温顺。2高产管护措施2.1公、母比例合理,嬉水促性鹅性头越大,产蛋越多。搭配合理的公鹅,每天放到江、河或塘中嬉水,能促进鹅的性头,并能     

种鸭不同阶段饲料量的合理控制

种鸭的产蛋期可分为4个阶段:20~25周龄为产蛋初期,25~30周龄为产蛋前期,30~48周龄为产蛋高峰期,48~66周龄为产蛋后期。在这4个阶段中,饲养管理要点各不相同。     

Phenotypic and genotypic background underlying variations in fatty acid composition and sensory parameters in European bovine breeds

Background： Consuming moderate amounts of lean red meat as part of a balanced diet valuably contributes to intakes of essential nutrients, in this study, we merged phenotypic and genotypic information to characterize the variation in lipid profile and sensory parameters and to represent the diversity among 15 cattle populations. Correlations between fat content, organoleptic characteristics and lipid profiles were also investigated. Methods： A sample of 436 largely unrelated purebred bulls belonging to 15 breeds and reared under comparable management conditions was analyzed. Phenotypic data -including fatness score, fat percentage, individual fatty acids （FA） profiles and sensory panel tests- and genotypic information from 11 polymorphisms was used. Results： The correlation coefficients between muscle total lipid measurements and absolute vs. relative amounts of polyunsaturated FA （PUFA） were in opposite directions. Increasing carcass fat leads to an increasing amount of FAs in triglycerides, but at the same time the relative amount of PUFAs is decreasing, which is in concordance with the negative correlation obtained here between the percentage of PUFA and fat measurements, as well as the weaker correlation between total phospholipids and total lipid muscle content compared with neutral lipids. Concerning organoleptic characteristics, a negative correlation between fiavour scores and the percentage of total PUFA, particularly to n-6 fraction, was found. The correlation between juiciness and texture is higher than with flavour scores. The distribution of SNPs plotted by principal components analysis （PCA） mainly reflects their known trait associations, although influenced by their specific breed allele frequencies. Conclusions： The results presented here help to understand the phenotypic and genotypic background underlying variations in FA composition and sensory parameters between breeds. The wide range of traits and breeds studied, along with the genotypic information on polymorphisms previo