The cattle genome has been in the news recently, e.g., “Cattle Genome Sequenced” and “Bovine Genome Could Lead To Better Meat For Consumers, Experts Say.” A quotation from the latter article: “The researchers used the complete sequence from a single Hereford cow and comparative genome sequences for six more breeds, looking for changes called single nucleotide polymorphisms – SNPs – markers that can help researchers identify favorable traits.” Related papers include “Genetics: It's a Bull's Market,” “The Genome Sequence of Taurine Cattle: A Window to Ruminant Biology and Evolution,” “Genome-Wide Survey of SNP Variation Uncovers the Genetic Structure of Cattle Breeds” (all in Science), and “A Whole-Genome Assembly of the Domestic Cow, Bos Taurus” in Genome Biology. There is also a special series from BioMedCentral: Bovine: The Companion Papers for the Publication of the Bovine Genome Sequence.
Cattle—agricultural economics 338.1762
Cattle—animal husbandry 636.2
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The number opposite the unsubdivided entry for cattle is both the interdisciplinary number for cattle and the animal husbandry number for cattle: 636.2 Ruminants and Camelidae Bovidae Cattle. The record for the zoology number for cattle—599.6422 Bos (Oxen)—has the note: “Class interdisciplinary works on Bos taurus (domestic cattle) in 636.2.” Clearly 636.2 is a good number for works that emphasize domestic cattle, including interdisciplinary works that have some discussion about wild ancestors of domestic cattle.
One might also browse the Relative Index for “genetics”:
see Manual at 576.5 vs. 572.8
Genetics—animal husbandry 636.0821
Genetics—animal husbandry—sheep 636.30821
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In biology there is a split between the interdisciplinary number 576.5 Genetics and 572.8 Biochemical genetics. The distinction is explained in the Manual entry 576.5 vs. 572.8 Genetics vs. Biochemical genetics. Genomes are classed with biochemical genetics in 572.86 DNA (Deoxyribonucleic acid), where there is a note: “Class here chromosomal DNA, codons, genes, genomes.” For example, works on genomes of sponges are classed in 572.86134 DNA of sponges. The number is built with 572.86 DNA (Deoxyribonucleic acid) plus 1 from 571.1 Animals, as instructed under 572.5–572.8 Specific biochemicals and biochemical genetics, plus 34 from 593.4 Porifera (Sponges) as instructed at 571.1. An example of a work classed in 572.86134 is Genome Organization in Sponges.
In animal husbandry, general genetics and biochemical genetics are classed together in 636.0821 Genetics or in other subdivisions of 636 Animal husbandry. Examples of works classed in 636.0821 are Chromosome Mapping of Some Genes in Farm Animals by In Situ Hybridization and Genome Analysis in Domestic Animals.
According to the rule of zero, for works about genetics of cattle, 636.2 Ruminants and Camelidae Bovidae Cattle is preferred over 636.0821 Genetics. The heading at 636.2 is a dual heading—actually, a triple heading, with three parts. Further addition is possible for each of the three parts, even the smallest part, cattle. The information conveyed in the dual/triple heading has hierarchical force and carries down to subdivisions that may mention only the broadest part of the heading as a kind of shorthand. At 636.2001–636.208 Standard subdivisions, specific topics on husbandry of ruminants and Camelidae is a note that permits addition of notation for genetics to the number for cattle: “Add to base number 636.20 the numbers following 636.0 in 636.001–636.08, e.g., heifers 636.207 . . . . .” Thus one can add 821 from 636.0821 Genetics to 636.20 to build 636.20821 Genetics of ruminants and Camelidae, of Bovidae, of cattle. An example of a work classed in 636.20821 is The Bovine Gene Map.
What about the genome sequence of a single Hereford cow? Hereford cattle are classed in 636.222 English beef breeds, where there is a note: “Including Hereford and Shorthorn cattle.” Again by the rule of zero, for works about genetics of Hereford cattle, 636.222 is preferred over 636.20821. There are no instructions for adding to express genetics of specific breeds, and if there were, one could not use them for Hereford cattle because Herefords are in the including note. An example of a work classed in 636.222 is International Genetic Evaluation for the North American Hereford and Polled Hereford Populations.