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A black sheep stands out from the flock. The Black Sheep from a 1901 edition of Mother Goose by William Wallace Denslow. In the English language, black sheep is an idiom that describes a member of a group who is different from the rest, especially a family member who does not fit in.
Sheep also enter in colloquial sayings and idiom frequently with such phrases as "black sheep". To call an individual a black sheep implies that they are an odd or disreputable member of a group. [172] This usage derives from the recessive trait that causes an occasional black lamb to be born into an entirely white flock. These black sheep were ...
It is a common practice in the commercial sheep industries of Australia, New Zealand, and South America. [16] Average success rates of ET in terms of embryos recovered can vary widely. Each breed will respond differently to the ET process. Typically, white-faced ewes and dogs are more fertile than black-faced ewes.
Domestication has been defined as "a sustained multi-generational, mutualistic relationship in which one organism assumes a significant degree of influence over the reproduction and care of another organism in order to secure a more predictable supply of a resource of interest, and through which the partner organism gains advantage over individuals that remain outside this relationship ...
Advances in molecular genetics have provided us with tools to better understand livestock origin and diversity. There are many technologies capable of determining genetic profiles, including whole genome sequencing, shotgun sequencing, RNA sequencing and DNA microarray analysis. These techniques allow us to map genomes and then analyze their ...
Sexual dimorphism is a product of both genetics and environmental factors. An example of sexual polymorphism determined by environmental conditions exists in the red-backed fairywren. Red-backed fairywren males can be classified into three categories during breeding season: black breeders, brown breeders, and brown auxiliaries. [71]
The syndrome was an economically significant issue for sheep breeders in the 1980s, [8] but with strict testing and breeding programs it has become less common. [ 8 ] The mutation which causes spider lamb syndrome is found on ovine chromosome 6, [ 9 ] and involves the inactivation of fibroblast growth factor receptor 3 . [ 10 ]
A flock of Black Welsh Mountain sheep. The Black Welsh Mountain sheep (Welsh: Defaid Mynydd Duon, pronounced [ˈdevaɪd ˈmənɪð ˈdɪɔn]) is a colour type of the Welsh Mountain sheep, bred for sheep farming in Wales. It occurs occasionally in flocks of other colours, but is now often maintained as a separate strain.