The relationships between seasonal variations in the concentrations of urea in bulk milk and the production and fertility of dairy herds. Journal of Veterinary Medicine 39, 187-192. Collick DW, Ward WR, Dobson H (1989). The association of types of lameness and fertility. Veterinary Record 125, 103-106.Dobson H, Smith RF (2000) What is stress and how does it affect reproduction? Animal Reproduction Science 60, 743 - 752.Dobson H., Smith RF (1998) Stress and subfertility. Reproduction In Domestic Animals 33: 107-111.Dobson H, Tebble JE, Smith RF, Ward WR (2001) is stress really all that important? Theriogenology 55, 65-73Gong JG, Knight CH, Logue DN, Crawshaw WM, Webb R (1999). Development of the dominant follicle is suppressed in postpartum dairy cows induced experimentally to produce maximum milk yield. Journal of Reproduction and Fertility Supplement 54, 506 (abstract).Gutierrez CG, Gong JG, Bramley TA, Webb R (1999). Effects of genetic selection for milk yield on metabolic hormones and follicular development in postpartum dairy cows. Journal of Reproduction and Fertility Abstract Series 24, 32 (abstract).Harrison RO, Ford SP, Young JW, Conley AJ, Freeman AE (1990). Increased milk production versus reproductive and energy status of high producing dairy cows. Journal of Dairy Science 73, 2749-2758.Staples CR, Burke JM, Thatcher WW (1998). Influence of supplemental fats on reproductive tissues and performance of lactating cows. Journal of Dairy Science 81, 856-871.Villa-Godoy A, Hughes TL, Emery RS, Chapin LT, Fogwell RL (1988). Associations between energy balance and luteal function in lactating dairy cows. Journal of Dairy Science 71, 1063-1072.Jordan ER, Swanson LV (1979). Effect of crude protein on reproductive efficiency, serum total protein and albumin in the high - producing dairy cow. Journal of Dairy Science 62, 58-63.Kendall NR, Scholey DV and Mann GE (2010). Milk estradiol and pedometer activity during estrus in dairy cows. Journal of Animal Science 88 Suppl 1, 677Lucy MC, Beck J, Staples CR, Head HH, De La Sota RL, Thatcher WW (1992). Follicular dynamics, plasma metabolites, hormones and insulin - like growth factor I (IGF-I) in lactating cows with positive or negative energy balance during the preovulatory period. Reproduction Nutrition and Development 32, 331-341.Mann GE, Lock AL., Bauman DE, Kendall NR (2007). Reproductive function in dairy cows fed a lipid encapsulated conjugated linoleic acid supplement. Journal of Dairy Science 90 Suppl. 1, 401.Mann GE, Mann SJ, Blache D, Webb R (2005). Metabolic variables and plasma leptin concentrations in dairy cows exhibiting reproductive cycle abnormalities identified through milk progesterone monitoring during the post partum period. Animal Reproduction Science 88, 191 - 202 McClure TJ (1994). Nutritional and metabolic infertility in the cow. CAB International. Opsomer G, Coryn M, Deluyker H, de Kruif A (1998). An analysis of ovarian dysfunction in high yielding dairy cows after calving based on progesterone profiles. Reproduction in Domestic Animals 33, 193 - 204.Pushpakumara PGA, Gardner NH, Reynolds CK, Beever DE, Wathes DC (1999). Metabolic characteristics associated with normal or abnormal progesterone profiles during the post partum period in dairy cows. Proceedings of British Society of Animal Science meeting on Fertility in the High-Producing Dairy Cow, Galway, 20 - 22 September 1999.Royal MD, Mann GE,