1. Clarke AK, Spearow AC, Owens MJ: Relationship of feeding time to time of parturition for dry Holstein cows. Journal of Dairy Science. 1983, 66 (suppl 1): 138-
2. Edwards SA: The timing of parturition in dairy cattle. Journal of Agricultural Science. 1979, 93: 359-363. 10.1017/S002185960003803X.
3. Genstat 5 Release 3.2: Lawes Agricultural Trust (Rothamsted Experimental Station). 1995
4. Gleeson DE, O'Brien B, O'Donovan K, Mee JF: Effect of silage feeding regimen on time of calving and behaviour in Holstein-Friesian cows. International Journal of Applied Research in Veterinary Medicine. 2003, 1: 311-317.
5. Lowman BG, Hankey MS, Scott NA, Deas DW: Influence of time of feeding on time of parturition in beef cows. Veterinary Record. 1981, 109: 557-559.