搜索结果: 76-90 共查到“知识库 遗传学”相关记录2196条 . 查询时间(2.922 秒)
中国荷斯坦牛产后0~35 d繁殖疾病遗传参数估计
繁殖疾病 子宫疾病 遗传参数 阈模型
2019/3/9
旨在估计中国荷斯坦牛产后0~35 d的繁殖疾病遗传参数。本研究收集了1993-2017年间北京地区27个场中国荷斯坦牛产后0~35 d 25 026条繁殖疾病记录，统计分析发病规律，采用阈模型和线性模型，以场年、胎次和产犊季节为固定效应，个体加性遗传效应和永久环境效应为随机效应得到遗传参数来探究中国荷斯坦牛产后0~35 d繁殖疾病遗传规律，同时尝试单独对子宫疾病进行遗传参数估计。结果显示，奶牛产后...
Demographic structure and genetic diversity of the endangered Bísaro pig: Evolution and current status
conservation genetic variation inbreeding pedigree analysis swine
2018/11/23
Bísaro pig, a local endangered swine breed, has gained popularity in the recent years. A complete pedigree was used to evaluate the population structure and investigate the current breed’s genetic var...
Genetic evaluation of clinical mastitis traits in Holstein cattle
udder health mastitis resistance genetic parameters genetic trend
2018/11/23
The results obtained from different models for predicting breeding values for clinical mastitis (CM) in Holstein cattle were compared. CM was recorded in 30 882 lactations of 12 793 cows in 8 herds fr...
Genetic differences in eggshell ultrastructural properties of Saudi native chicken breeds kept at high ambient temperatures
eggshell strength egg quality mammilliary layer total score
2018/11/23
Egg quality and eggshell ultrastructural properties of four Saudi native chicken breeds were compared to detect genetic differences. A total of 480 laying hens at 28 weeks of age, representing four Sa...
Evaluation of gestation length and birth weight of offspring of Polish native cattle breeds in context of estimating genetic parameters
pregnancy birth body weight heritability native breed
2018/11/23
Research material included data on gestation length of 15 436 cows of Polish native breeds. These were: White Backed (BG; 324 records), Polish Red (RP; 5396 records), Polish Black and White (ZB; 3508 ...
Estimation of genetic parameters of fatty acids composition in flesh of market size common carp (Cyprinus carpio L.) and their relation to performance traits revealed that selective breeding can indirectly affect flesh quality
genetic correlations genetic improvement growth heritability slaughtering traits, supplemental feeding
2018/11/23
Fish are a rich source of omega-3 polyunsaturated fatty acids (n-3 PUFAs) and thus, they should be an integral part of human diet at least twice a week. As a result, high attention has been devoted to...
Genetic analysis of the Hungarian population of endangered Hucul horses
genetic diversity pedigree analysis genetic protection endangered breed
2018/11/23
The population genetic evaluation of the Hungarian Hucul horse population was performed based on pedigree records. Herd book data of registered Hucul horses available up to 2016 were analysed using EN...
Bayesian inference of genetic parameters for reproductive and performance traits in White Leghorn hens
egg production fertility genetic correlation hatchability heritability
2018/11/23
This study estimated the genetic parameters for reproductive and performance traits and determined which ones can be used as selection criteria for egg production in laying hens using the Bayesian inf...
Genetic evaluation of growth traits in Nellore cattle through multi-trait and random regression models
body weight genetic parameters growth curves
2018/11/23
We aimed to evaluate different orders of fixed and random effects in random regression models (RRM) based on Legendre orthogonal polynomials as well as to verify the feasibility of these models to des...
Evaluation of genetic variability of the breed Norik of Muran according to pedigree information
draught horse interbreeding local breed gene origin
2018/11/23
The Norik of Muran, a unique draught horse bred in Slovakia, belongs to country’s biodiversity treasures. The genetic diversity of this horse type was evaluated on the basis of indicators derived from...
通过RAPD标记法对5类喀斯特小生境中小蓬竹的遗传结构及其多样性进行了分析。RAPD随机引物8个扩增共得87个清晰度高且重复性好的条带，分子量200~3 000 bp，含多态68条，物种PPL=78.16%，Nei's基因多度H=0.291 3，Shannon多样性指数I=0.431 0。土面（TM）生长的小蓬竹遗传多样性水平最高（PPL=47.13%，H=0.195 3，I=0.283 4），石...
基于高通量测序的怒江红山茶微卫星位点特征分析
怒江红山茶 转录组 微卫星 高通量测序
2019/5/27
以怒江红山茶叶片为材料，采用Illumina Hiseq 2000平台测序，共获得140 996条无冗余的序列，进行SSR位点搜索后，得到32 696个SSR位点，出现频率为23.2%。所搜索的SSR以二核苷酸重复类型最多，三核苷酸和单核苷酸次之，四、五、六核苷酸重复类型较少（<1%）。单核苷酸重复类型中以A/T基元较丰富（10.92%）；二核苷酸中AG/CT基元出现频率最大，达到49.72%，A...
雷公藤甲素对TM4细胞氧化应激及PI3K/AKT通路的影响
雷公藤甲素 睾丸支持细胞 氧化应激 细胞凋亡 PI3K/Akt信号通路
2018/12/6
目的：探讨雷公藤甲素（triptolide ，TP）对TM4小鼠睾丸支持细胞氧化应激、凋亡的影响及相关分子信号调控机制。方法：不同浓度雷公藤甲素对TM4细胞染毒24 h；细胞增殖实验检测雷公藤甲素对TM4细胞增殖的抑制作用；通过2′,7′二氯荧光黄双乙酸盐（6-carboxy-2′,7′dichlorofluorescein diacetate，DCFH-DA）探针检测TM4细胞内活性氧水平的...
基于SSR标记的不同优势等级云南松遗传多样性分析
优势等级 遗传多样性 云南松
2019/5/27
基于SSR分子标记技术，按树高和胸径（地径）因子将样地内的植株分为优势木、中等木和劣势木3类，对不同生长优势等级云南松林木的遗传多样性变异特征进行了研究。结果表明：在林冠层，优势木的有效等位基因数、Shannon's信息指数、观测杂合度和期望杂合度分别为2.083、0.762、0.290和0.423，略高于中等木和劣势木；在更新层，有效等位基因数、Shannon's信息指数、观测杂合度和期望杂合度...