i am going to respect my friend's work product and not release any of his list at this time and have indicated to him that there a folks wishing to have his list.
however, some of your questions i think i can answer.
Q: which JAV idols made bestiality videos? A: javlibrary+com has listed a fair number of jav beast videos (no covers are provided) and if you determine the product id (e.g., KRFV-001 to KRFV-029 by karma, DFE-008 (risa murakami) by fearless, DJK-001 to DJK-040 by gekiko, MAD-03 to MAD-84 by glory quest, MAXD-03 to MAXD-22 by alpha international, KMD-01 to KMD-04 by TTS, GLSE-001 tp GLSE-025 by global secret) you can determine most of the actress names listed at javlibrary (especially at the japanese title of the video ~ the japanese title often has the name of the actress in the title).
here is a list of the glory quest animal emperor /
獣皇 videos: https://ja.wikipedia.org/wiki/獣皇 with a list of the actresses in japanese
and, of course, the first "dog game" video (MAXD-04) the actress was the magnificent sakurada sakura
Q: have new bestiality videos been made? A: by my discernment (admittedly greatly based on my friend's excel as well as my own collection of jav beast video) there have been no new jav beast videos made in at least 5 years and probably for an even longer period of time.
my Q: why aren't more japanese beast video being produced?
my A: i haven't been able to determine this issue to my full satisfaction, although i think i have come up with a possible answer. in the late 2000s japan strengthened its animal welfare laws. however, more likely the reduction of jav beast production is related to the backlash caused by the gang r***s and r*** convictions associated with Bakky Visual Planning. i believe because of the Bakky Visual Planning criminal convictions and increased complaints by actreasses and consumer organizations (Consumer Involvement in Japanese Pornography Production @
https://digitalcommons.uri.edu/cgi/viewcontent.cgi?article=1106&context=dignity) all japanese video that portrays non-consentual activity is under increased scrutiny. if producers of video think they might be prosecuted for making a video portraying non-consenual activity (see, e.g., Japan: Coerced filming of Adult Pornographic videos @
http://hrn.or.jp/eng/wp-content/upl...AVindustry-20160303-tentative-translation.pdf), including bestiality. the producers have prudently stopped making videos. and i am sure the diminution of the production of most western beast video has had an effect on the japanese market for such video as well.