由于rob(1;29)频率较高，一个牛品种的二倍体数接近58。

A cattle breed close to 58 diploid number due to high frequency of rob(1;29).

作者信息

Rangel-Figueiredo T, Iannuzzi L

机构信息

Departamento de Zootecnia, UTAD, Vila Real, Portugal.

出版信息

Hereditas. 1991;115(1):73-8. doi: 10.1111/j.1601-5223.1991.tb00349.x.

DOI:10.1111/j.1601-5223.1991.tb00349.x

PMID:1774185

Abstract

Barrosa cattle, reared in the north of Portugal primarily for meat production, number about 40,000 (about 6% of all cattle in Portugal). Their fertility (number of calves per 100 cows) varies from 60% to 80% and is lower than that of other Portuguese cattle breeds. 195 animals (28 males and 167 females), randomly selected from a large area, were sampled for cytogenetical investigation. The results were the following: (a) 68 (34.9%) animals (7 males and 61 females) had normal karyotypes; (b) 127 (65.1%) were found to be carriers of rob(1; 29), as shown by G- and R-banding; (c) 102 (52.3%) animals (17 (8.7%) males and 85 (43.6%) females) were heterozygous carriers; (d) 25 (12.8%) animals (4 (2%) males and 21 (10.8%) females) were homozygous carriers. C-banding patterns revealed one block of constitutive heterochromatin (HC) in the proximal q-arm region of the translocated chromosome.

摘要

巴罗萨牛主要饲养在葡萄牙北部用于肉类生产，数量约为40000头（约占葡萄牙所有牛的6%）。它们的繁殖力（每100头母牛产犊数量）在60%至80%之间，低于其他葡萄牙牛品种。从大片区域随机选取195头动物（28头雄性和167头雌性）进行细胞遗传学调查。结果如下：(a) 68头（34.9%）动物（7头雄性和61头雌性）具有正常核型；(b) 通过G带和R带分析发现，127头（65.1%）是1; 29罗伯逊易位携带者；(c) 102头（52.3%）动物（17头（8.7%）雄性和85头（43.6%）雌性）是杂合携带者；(d) 25头（12.8%）动物（4头（2%）雄性和21头（10.8%）雌性）是纯合携带者。C带分析显示，易位染色体近端q臂区域有一个组成型异染色质（HC）块。