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Polled strains have been developed of many cattle breeds which were originally horned. This has usually been done by crossing with naturally polled breeds, most commonly Angus and Galloway cattle. For example, polled Jersey cattle originated in Ohio sometime prior to 1895. Two strains were developed, the first to appear being founded by crosses ...
Polled Holsteins are cattle born without horns but only occur in a small portion of Holstein cattle. The Holstein breed can go through selective breeding to produce polled calves. Polled is a natural trait for Holsteins but have not been bred for specifically.
They may be horned or polled, and homozygous (2 copy), or heterozygous (1 copy). [19] Fullbloods and Naturalean bulls are often crossed with traditional beef breeds like Black Angus or Hereford cattle because of substantial benefits in the crossbred results, including a higher protein meat that is lower in saturated fat, improved tenderness ...
Inheritance of a polled gene can be examined in Zygosity, that explores the alleles of genes specifically Homozygous, that in cattle (and probably others) would be homozygous (PP) polled (dominant) and Heterozygous that would be heterozygous (Pp) horned.
In Italy, the Piedmontese is a dual-purpose breed: the cattle are raised for their milk, which is used in the production of several traditional cheeses of the region, including Castelmagno, Bra, Raschera, and Toma Piemontese; [4] [5] and are also raised for meat, as beef from Piedmontese cattle is seen as a premium product.
EU legislation on dehorning practices is expected to place greater pressure to breed polled cattle, which is being pursued in France by the GIE Polled Excellence group. [36] Because no French Limousins had been identified with the polled gene, a breeding programme commenced in 2005 with polled Canadian bulls of phenotype closest to the French ...
The words homozygous, heterozygous, and hemizygous are used to describe the genotype of a diploid organism at a single locus on the DNA. Homozygous describes a genotype consisting of two identical alleles at a given locus, heterozygous describes a genotype consisting of two different alleles at a locus, hemizygous describes a genotype consisting of only a single copy of a particular gene in an ...
The El gene is semi-dominant (allowing homozygous lambs to be identified at birth), and is not associated with the gene for horns (ewes are always polled, rams may be horned or polled). The breed was developed in Australia from a mutant Romney ram rather than in New Zealand.