Bovo: Malsamoj inter versioj

A cow's [[udder]] contains two pairs of [[mammary gland]]s, (commonly referred to as ''teats'') creating four "quarters".<ref>{{Cite book |title=The Family Cow Handbook |last=Hasheider |first=Phillip|isbn=0-7603-4067-6}}</ref> The front ones are referred to as ''fore quarters'' and the rear ones ''rear quarters''.<ref>{{Cite web |url=https://www.uvm.edu/extension/agriculture/faccp/files/aglabor_bilingual/milk_quality_posters.pdf |title=Udder Structure & Disease |date=2015-05-06|website=UVM|deadurl=yes |archiveurl=https://web.archive.org/web/20150518073505/https://www.uvm.edu/extension/agriculture/faccp/files/aglabor_bilingual/milk_quality_posters.pdf |archivedate=18 May 2015 |df=dmy-all}}</ref>

 

Bulls become fertile at about seven months of age. Their fertility is closely related to the size of their [[testicle]]s, and one simple test of fertility is to measure the circumference of the scrotum: a young bull is likely to be fertile once this reaches {{convert|28|cm|in|0}}; that of a fully adult bull may be over {{convert|40|cm|in|0}}.<ref>{{cite web |url=http://www.nt.gov.au/d/Content/File/p/Anim_Dis/747.pdf |title=G Jayawardhana (2006), ''Testicle Size – A Fertility Indicator in Bulls'', Australian Government Agnote K44. |format=PDF|accessdate=6 August 2012 |deadurl=yes |archiveurl=https://web.archive.org/web/20121116045317/http://www.nt.gov.au/d/Content/File/p/Anim_Dis/747.pdf |archivedate=16 November 2012 |df=}}</ref><ref>{{cite web |url=http://www.reproduction-online.org/cgi/reprint/59/2/447.pdf |title=A P Carter, P D P Wood and Penelope A Wright (1980), Association between scrotal circumference, live weight and sperm output in cattle, ''Journal of Reproductive Fertility'', '''59''', pp 447–451. |format=PDF|accessdate=6 August 2012}}</ref>