1. Simulated effects on dairy cattle health of extending the voluntary waiting period with recombinant bovine somatotrophin;Allore;Preventative Veterinary Medicine,2000
2. Choudrie SL, Jackson J, Watterson JD, Murrells T, Passant N, Thomson A, Cardenas L, Leech A, Mobbs DC, Thistlewaite G 2010. UK greenhouse gas inventory 1990–2008: annual report for submission under the framework convention on climate change. AEA Technology, Dicot, Oxfordshire, UK. Retrieved April 4, 2012, from http://www.airquality.co.uk/reports/cat07/1005070919_ukghgi-90-08_main_chapters_Issue3_Final.pdf.
3. DairyCo 2010. Is dairy cow fertility a lost cause? Retrieved April 4, 2012, from http://www.dairyco.net/news/technical-articles/july-2010/is-dairy-cow-fertility-a-lost-cause.aspx.
4. Agriculture in the UK 2007,2009
5. The environmental impact of fertility in dairy cows: a modelling approach to predict methane and ammonia emissions;Garnsworthy;Animal Feed Science and Technology,2004