查询词典 cattle breeding

It was shown that the stable carbon isotope composition of beef tissue was primarily dependent on the diet the animals were fed,meanwhile theδ~(13)C values of cattle tail hair, defatted muscle and crude fat all enhanced with the increment of the proportions of C4 constituents in diet, but those values were on the contrary with the enhancement of the proportions of C3 constituents. Moreover, allδ~(13)C values of different tissues were significantly correlated with the content of C4 and C3 plant material. So, the main component of cattle feed could be investigated with the help ofδ~(13)C values. Theδ~(15)N values of beef tissues were affected by feed composition to some extent, but it had no regularity. The cattle tail hair and defatted muscle enriched in 13C to their feeds gave different results between the two groups, but cattle tail hair enriched in 15N much more than defatted muscle and in the proportion of 3‰- 5‰, plus, cattle variety and individual had effect on the proportion of enrichment.

结果表明，牛组织中碳同位素组成主要受饲料的影响，牛尾毛、脱脂肌肉、粗脂肪中的δ~(13)C值随着C4植物含量在牛饲料中的比例增加而升高，随着C3植物含量在牛饲料中的比例增大而降低，并且均与C4、C3植物含量呈极显著的相关性(P.01)，用牛组织中的δ~(13)C值可以调查牛饲料中的主要成分；牛组织中的氮同位素一定程度上受饲料因素的影响，但未随饲料组成成分的改变而呈现规律性变化；牛尾毛、脱脂肌肉相对饲料对13C的富集比例两组试验结果不一致，牛尾毛对15N的富集比例大于脱脂肌肉，富集比例约在3‰- 5‰，饲料种类、牛个体等因素对富集比例均有一定影响；牛尾毛、脱脂肌肉、粗脂肪中的δ~(13)C值三者之间相关性达到极显著水平(P.01)。

The mixed sown pasture of white clover and cocksfoot, which was the most typical grassland type on the Yun-Gui plateau, and the ideal beef cattle varieties such as shorthorn and cross-bred breed cattle by three components , which were adapted to be raised and grazed on the pasture in the south of China were studied as follows: Firstly, the basic data regarding pasture production, beef cattle production, grazing management and running management inside and outside of China were collected in flocks on the basis of collectivity optimization for beef cattle grazing system on sown pasture and a whole set of system of indicator management for beef cattle production had been studied on the whole aspects in order to manage every factor affecting on grazing system in fix quantity.

在对人工草地肉牛放牧系统进行总体优化的基础上，收集大量国内外有关牧草生产、肉牛生产、放牧管理和经营管理等方面的大量基础资料，从系统角度研究出一套完整的肉牛生产的指标管理体系，以对影响放牧系统的各个因素进行定量化管理；2。

It implies that the relationship between Japanese black cattle and Mongolian cattle is more distant. According to that the rate of sequence divergence of mtDNA is estimated to be 2% per million years, Haplotype II and III of mongolian cattle s mtDNA might be separate about 240 thousand years ago, which is earlier than the 10000-year history of cattle husbandry. Haplotype of yellow cattleand zebu cattle might be separate about 0.73-0.92 million years ago.

按照哺乳动物mtDNA碱基突变率每百万年2％计算，单倍型Ⅱ和Ⅲ(遗传距离为0.478％)所代表的蒙蒙古牛和日本和牛遗传多态性比较研究硕士学位论文古牛群体之间的分化时间大约24万年，这比人类驯化牛10000的历史要久远得多。I单倍型和11、m两种单倍型(遗传距离为1.467%，1.83870)所代表的牛群体之间的分化时间大约73万年至92万年前。

H6 heliotype did not found in Nanyang cattle and Luxi cattle. 5 Yellow cattle and yak had different allele in UMN0307 locus, so this locus could be used to differentiate yellow cattle and yak. We did not find yak's allele in yellow cattle populations, which indicated that there was not yak male origin in these 4 populations.

UMN0307 位点在牦牛和普通牛、瘤牛有不同的等位基因，可以用于牦牛和瘤牛、普通牛的分离鉴定；在本实验研究个体中，没有在黄牛中发现和牦牛相同的等位基因，表明至少在这四个群体所检测个体中，没有发现牦牛的父系起源。

High-quality, low price, the sale of breeding perennial Small Tail Han sheep, Boer goats, Luxi Cattle Simmental, Limousin cattle, dairy cattle and sheep and so on. In 2000, by the Ministry of Agriculture as a "country focus on the industrialization of agriculture leading enterprises," Sheep Association units, Shandong Province, a breeding base for promotional work.

以高质量、低价格，常年出售良种小尾寒羊、波尔山羊、鲁西黄牛西门塔尔、利木赞牛、奶牛和肉羊等。2000年，被农业部评为"国家农业产业化重点龙头企业"，养羊协会理事单位，山东省一级繁育供种推广基地。

The genetic variations and polymorphisms of six microsatellite loci were analyzed to determine the population structure and breeding progress of BMY and Brahman cattle. The range of polymorphic information content of six loci was 0.524～0.752. The unbiased expected and observed heterozygosity were similar and were 0.7376 and 0.7396,0.6412 and 0.6537 for BMY and Brahman cattle, respectively. The expected heterozygosity was relatively high in the second generation of BMY in inter se breeding, which was congruent with the breeding progress.

对6个牛微卫星座位的遗传变异及多态性分析，以期了解BMY牛和婆罗门牛的群体遗传结构与育成情况。6个微卫星座位的多态信息含量为在0.524～0.752间，BMY牛、婆罗门牛两个群体的平均期望杂合度和观察杂合度值接近，分别为0.737 6和0.739 6，0.641 2和0.653 7，进入横交固定第二世代的BMY牛期望杂合度值较高，这与我们的育种进展相符。

Translated Description: Breeding net to provide piglets piglet breeding, cattle and sheep, animal husbandry, aquatic products, feed, Miaoji chicks, eggs, poultry , veterinary drugs, special breeding and other livestock products transactions; free release livestock products supply and demand information section includes: Aquaculture, breeding Quotes,...

Description：养殖网提供苗猪仔猪养殖，牛羊，畜牧，水产，饲料，苗鸡雏鸡，鸡蛋，家禽，兽药，特种养殖等畜牧养殖产品交易；免费发布畜牧养殖产品供求信息，栏目包括：养殖资讯，养殖行情，。。。

The level is higher in the breeding time than in the non-breeding time. The change of T level is significantly correlated with the breeding season. The change of T level of the male Equus hemionus is significantly correlated with the seasonal change of a lot of breeding behaviors, illustrating that the breeding behavior of the male Equus hemionus is regulated by the T secreted by the testis.

雄性蒙古野驴的T变化水平与很多繁殖行为的季节性变化显著相关，说明雄性蒙古野驴的繁殖行为是受精巢分泌的T调节的，T分泌的季节性波动是雄性蒙古野驴繁殖行为季节性变化的生理基础。

Optimization of breeding schemes for quality pig was studied through four parts: fixing on the breeding goal, constructing and optimizing crossbreeding system, optimizing breeding schemes for pure line breeding and reproduction population. Aim of this study was offering theory base and practice guarantee for quality pig breeding and production in China, and improving pork's competition power. Quality pig was that it has high yield, good quality and big safety.

本文通过优质猪育种目标的确定、杂交繁育体系的构建与优化、纯系繁育群育种方案的优化以及优质猪选育的其它环节四部分对优质猪的选育方案进行了优化研究，目的在于为我国优质猪(产量高、质量优且安全的猪)的育种和生产提供理论基础和实践保障，提高猪肉产品的竞争力。

Chuang Tzu said, Baili Xi had no utilitarianism so he bred his cattle based on the cattle's interest. He didn't feed anti-bio to his cattle; he didn't inject his cattle with fatten dosage; he didn't breed them in byre.

庄子还说：「百里奚心中不具功利主义，所以，他养牛时，以牛本身的利益作为为出发点，他既不会喂它吃抗生素，也不会打催肥针，更不会将之围在兽栏里。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？