Declining fertility in dairy cattle: changes in traditional and endocrine parameters of fertility.

By M. Royal, A. O. Darwash, A. Flint, R. Webb, J. A. Woolliams, G. Lamming. 2000

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Reproductive loss in high-producing dairy cattle: where will it end? (2001, background): “Many candidates have been tested in the past, and we understand a lot more about the endocrine cues that control reproductive function than we once did (Beam and Butler, 1999; Butler, 2000; Roche et al., 2000; Royal et al., 2000).”
The environmental impact of fertility in dairy cows: a modelling approach to predict methane and ammonia emissions (2004, background): “At current fertility levels (OD 50%: CR 38 %, Royal et al., 2000), total herd emissions were 37 t methane/yr for a herd yielding 6000 litres and 19 t methane/yr for a herd yielding 9000 litres.”
Effect of sire, age at first calving, season and year of calving and parity on reproductive performance of Friesian cows under semiarid conditions in Egypt. (2010, result): “Contrary, Sabino et al. (1981) found that month of birth significantly affected AFC.”