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The National Council of Milk Recording. The summary of milk recording report. <i>Livestock Improvement Association of Japan<\/i> 2011; 23: 11\u201322(In Japanese)."},{"key":"2","doi-asserted-by":"crossref","unstructured":"2. L\u00f3pez-Gatius F. Is fertility declining in dairy cattle? A retrospective study in northeastern Spain. <i>Theriogenology<\/i> 2003; 60: 89\u201399.","DOI":"10.1016\/S0093-691X(02)01359-6"},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. Van Eerdenburg FJCM, Loeffler HSH, van Vliet JH. Detection of oestrus in dairy cows: a new approach to an old problem. <i>Vet Q<\/i> 1996; 18: 52\u201354.","DOI":"10.1080\/01652176.1996.9694615"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. Van Vliet JH, Van Eerdenburg FJCM. Sexual activities and oestrus detection in lactating Holstein cows. <i>Appl Anim Behav Sci<\/i> 1996; 50: 57\u201369.","DOI":"10.1016\/0168-1591(96)01068-4"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5. 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Relationship among estradiol, cortisol and intensity of estrous behavior in dairy cattle. <i>Theriogenology<\/i> 2000; 53: 1783\u20131795.","DOI":"10.1016\/S0093-691X(00)00314-9"},{"key":"16","doi-asserted-by":"crossref","unstructured":"16. Sakaguchi M, Fujiki R, Yabuuchi K, Takahashi Y, Aoki M. Reliability of estrous detection in Holstein heifers using a radiotelemetric pedometer located on the neck or legs under different rearing conditions. <i>J Reprod Dev<\/i> 2007; 53: 819\u2013828.","DOI":"10.1262\/jrd.18099"},{"key":"17","doi-asserted-by":"crossref","unstructured":"17. Maatje K, Loeffler SH, Engel B. Predicting optimal time of insemination in cows that show visual signs of estrus by estimating onset of estrus with pedometers. <i>J Dairy Sci<\/i> 1997; 80: 1098\u20131105.","DOI":"10.3168\/jds.S0022-0302(97)76035-1"},{"key":"18","doi-asserted-by":"crossref","unstructured":"18. Roelofs JB, van Eerdenburg FJCM, Soede NM, Kemp B. Pedometer readings for estrous detection and as predictor for time of ovulation in dairy cattle. <i>Theriogenology<\/i> 2005; 64: 1690\u20131703.","DOI":"10.1016\/j.theriogenology.2005.04.004"},{"key":"19","doi-asserted-by":"crossref","unstructured":"19. Roelofs JB, Graat EAM, Mullaart E, Soede NM, Voskamp-Harkema W, Kemp B. Effects of insemination-ovulation interval on fertilization rates and embryo characteristics in dairy cattle. <i>Theriogenology<\/i> 2006; 66: 2173\u20132181.","DOI":"10.1016\/j.theriogenology.2006.07.005"},{"key":"20","doi-asserted-by":"crossref","unstructured":"20. Redden KD, Kennedy AD, Ingalls JR, Gilson TL. Detection of estrus by radiotelemetric monitoring of vaginal and ear skin temperature and pedometer measurements of activity. <i>J Dairy Sci<\/i> 1993; 76: 713\u2013721.","DOI":"10.3168\/jds.S0022-0302(93)77394-4"},{"key":"21","doi-asserted-by":"crossref","unstructured":"21. Fisher AD, Morton R, Dempsey JMA, Henshall JM, Hill JR. Evaluation of a new approach for the estimation of the time of the LH surge in dairy cows using vaginal temperature and electrodeless conductivity measurements. <i>Theriogenology<\/i> 2008; 70: 1065\u20131074.","DOI":"10.1016\/j.theriogenology.2008.06.023"},{"key":"22","doi-asserted-by":"crossref","unstructured":"22. Rajamahendran R, Robinson J, Desbottes S, Walton JS. Temporal relationships among estrus, body temperature, milk yield, progesterone and luteinizing hormone levels, and ovulation in dairy cows. <i>Theriogenology<\/i> 1989; 31: 1173\u20131182.","DOI":"10.1016\/0093-691X(89)90086-1"},{"key":"23","unstructured":"23. Noakes DE. Endogenous and exogenous control of ovarian cyclicity. <i>In: <\/i>Noakes DE, Parkinson TJ, England GCW (eds.), Veterinary Reproduction and Obstetrics, 9th ed. London: Saunders Ltd, 2001; 22."},{"key":"24","doi-asserted-by":"crossref","unstructured":"24. Senger PL. 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Electrical conductivity of reproductive tissue for detection of estrus in dairy cows. <i>J Dairy Sci<\/i> 1989; 72: 693\u2013701.","DOI":"10.3168\/jds.S0022-0302(89)79161-X"},{"key":"31","doi-asserted-by":"crossref","unstructured":"31. Ferguson JD, Galligan DT, Thomsen N. Principal descriptors of body condition score in Holstein cows. <i>J Dairy Sci<\/i> 1994; 77: 2695\u20132703.","DOI":"10.3168\/jds.S0022-0302(94)77212-X"},{"key":"32","doi-asserted-by":"crossref","unstructured":"32. Sartori R, Haughian JM, Shaver RD, Rosa GJ, Wiltbank MC. Comparison of ovarian function and circulating steroids in estrous cycles of Holstein heifers and lactating cows. <i>J Dairy Sci<\/i> 2004; 87: 905\u2013920.","DOI":"10.3168\/jds.S0022-0302(04)73235-X"},{"key":"33","doi-asserted-by":"crossref","unstructured":"33. Prakash BS, Meyer HH, Schallenberger E, van de Wiel DF. 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