[1]
|
Moore, K. and Thatcher, W.W. (2006) Major advances associated with reproduction in dairy cattle. Journal of Dairy Science, 89, 1254-1266.
doi:10.3168/jds.S0022-0302(06)72194-4
|
[2]
|
Studer, E. (1998) A veterinary perspective of on-farm evaluation of nutrition and reproduction. Journal of Dairy Science, 81, 872-876.
doi:10.3168/jds.S0022-0302(98)75645-0
|
[3]
|
Norman, H.D., Wright, J.R., Hubbard, S.M., Miller, R.H. and Hutchison, J.L. (2009) Reproductive status of Holstein and Jersey cows in the United States. Journal of Dairy Science, 92, 3517-3528.
doi:10.3168/jds.2008-1768
|
[4]
|
Stransberg, E. and Oltenacu, P.L. (1989) Economic consequences of different calving intervals. Acta Agriculture Scandinavica, 39, 407-420.
|
[5]
|
Jordan, E.R. (2003) Effects of heat stress on reproduction. Journal of Dairy Science, 86, 104-E114.
doi:10.3168/jds.S0022-0302(03)74043-0
|
[6]
|
Lima, F.S., De Vries, A., Risco, C.A., Santos, J.E.P. and Thatcher, W.E. (2010) Economic comparison of natural service and timed artificial insemination breeding programs in dairy cattle. Journal of Dairy Science, 93, 4404- 4413. doi:10.3168/jds.2009-2789
|
[7]
|
Senger, P.L. (1994) The estrus detection problem: new concepts, technologies, and possibilities. Journal of Dairy Science, 77, 2745-2753.
doi:10.3168/jds.S0022-0302(94)77217-9
|
[8]
|
Redden, K.D., Kennedy, A.D., Ingalls, J.R. and Gilson, T.L. (1993) Detection of estrus by radiotelemetric monitoring of vaginal and ear skin temperature and pedometer measurements of activity. Journal of Dairy Science, 76, 713-721. doi:10.3168/jds.S0022-0302(93)77394-4
|
[9]
|
Barr, H.L. (1975) Influence of estrus detection on days open in dairy herds. Journal of Dairy Science, 58, 246-247. doi:10.3168/jds.S0022-0302(75)84554-1
|
[10]
|
Holmann, F.J., Shumway, C.R., Blake, R.W., Schwart, R.B. and Sudweeks, E.M. (1984) Economic value of days open for Holstein cows of alternative milk yields with varying calving intervals. Journal of Dairy Science, 67, 636-643. doi:10.3168/jds.S0022-0302(84)81349-1
|
[11]
|
Xu, Z.Z., McKnight, D.J., Vishwanath, R., Pitt, C.J. and Burton, L.J. (1998) Estrus detection using radiotelemetry or visual observation and tail painting for dairy cows on pasture. Journal of Dairy Science, 81, 2890-2896.
doi:10.3168/jds.S0022-0302(98)75849-7
|
[12]
|
Lovendahl, P. and Chagunda, M.G.G. (2010) On the use of physical activity monitoring for estrus detection in dairy cows. Journal of Dairy Science, 93, 249-259.
doi:10.3168/jds.2008-1721
|
[13]
|
Lane, A.J. P. and Wathes, D.C. (1998) An electronic nose to detect changes in perineal odors associated with estrus in the cow. Journal of Dairy Science, 81, 2145-2150.
doi:10.3168/jds.S0022-0302(98)75791-1
|
[14]
|
Moore, A.S. and Spahr, S.L. (1991) Activity monitoring and an enzyme immunoassay for milk progesterone to aid in the detection of estrus. Journal of Dairy Science, 74, 3857-3862. doi:10.3168/jds.S0022-0302(91)78578-0
|
[15]
|
Nikkhah, A., Karimzadeh, S.M. and Amanloo, H. (2010) Designing, manufacturing and validating a cervix-monitoring technology for optimum estrus detection and reproduction. Iranian Society of Animal Science Proceedings, Pardis, Karaj.
|
[16]
|
Iranian Council of Animal Care. (1995) Guide to the Care and Use of Experimental Animals, vol. 1. Isfahan University of Technology, Isfahan.
|
[17]
|
SAS User’s Guide. (2003) Version 9.1. Edition. SAS Institute Inc., Cary.
|
[18]
|
De Vries, A. (2006) Economic value of pregnancy in dairy cattle. Journal of Dairy Science, 89, 3876-3885.
doi:10.3168/jds.S0022-0302(06)72430-4
|
[19]
|
Olynk, N.J. and Wolf, C.A. (2008) Economic analysis of reproductive management strategies on US commercial dairy farms. Journal of Dairy Science, 91, 4082-4091.
doi:10.3168/jds.2007-0858
|
[20]
|
Williams, W.F., Yver, D.R. and Gross, T.S. (1981) Comparison of estrus detection techniques in dairy heifers. Journal of Dairy Science, 64, 1738-1741.
doi:10.3168/jds.S0022-0302(81)82757-9
|