Table 6.

Top 20 keywords with centrality value.

Rank	Counts ${}^{\ast }$	Centrality	Year	Keywords
1	1022	0.02	2000	selection
2	962	0.02	2000	trait
3	822	0.02	2000	genetic parameter
4	794	0.03	2000	dairy cattle
5	622	0.02	2000	cattle
6	618	0.01	2000	parameter
7	600	0.02	2000	breeding value
8	572	0.02	2000	growth
9	503	0.03	2000	prediction
10	482	0.02	2000	performance
11	459	0.02	2000	population
12	426	0.02	2000	beef cattle
13	415	0.01	2000	model
14	357	0.02	2000	genetic evaluation
15	331	0.01	2000	cow
16	328	0.03	2000	information
17	318	0.01	2007	genomic selection
18	313	0.01	2000	milk yield
19	303	0.02	2001	accuracy
20	275	0.02	2000	milk production

${}^{\ast }$  Counts: the number of times the keyword was seen.