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Abstract

Expression of estrus near timed artificial insemination (TAI) is associated with greater fertility, and estrus detection could improve TAI fertility or direct TAI management, although accurate estrus detection can be difficult and time-consuming using traditional methods. The aim of this study is...

Author(s)
Nogueira, E.; Silva, M. R.; Silva, J. C. B.; Abreu, U. P. G.; Anache, N. A.; Silva, K. C.; Cardoso, C. J. T.; Sutovsky, P.; Rodrigues, W. B.
Publisher
Cambridge University Press, Cambridge, UK
Citation
Animal, 2019, 13, 10, pp 2305-2312
Abstract

Until recently, labor required to detect estrus for individual cows or heifers in a herd was the primary reason beef producers viewed artificial insemination as impractical. However, improvements in methods to control estrus and ovulation in beef heifers and cows are now expanding the use of...

Author(s)
Patterson, D.; Thomas, J.
Publisher
The Society for Theriogenology, Montgomery, USA
Citation
Clinical Theriogenology, 2019, 11, 3, pp 265-284
Abstract

Using an activity monitoring system (AMS) equipped with an accelerometer, 2 experiments were conducted to test the hypotheses that (1) enhancing progesterone before inducing luteolysis or (2) exposing cows to estradiol cypionate (ECP) or testosterone propionate (TP) after luteolysis would increase...

Author(s)
Sauls, J. A.; Voelz, B. E.; Hill, S. L.; Mendonça, L. G. D.; Stevenson, J. S.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2017, 100, 1, pp 807-820
Abstract

Precision dairy farming technologies have tremendous potential to improve and support farmers in herd management decisions, particularly in reproductive management. Nowadays, estrus detection in cows is challenging and several supporting tools are available. In this study, a 3D-accelerometer...

Author(s)
Schweinzer, V.; Gusterer, E.; Kanz, P.; Krieger, S.; Süss, D.; Lidauer, L.; Berger, A.; Kickinger, F.; Öhlschuster, M.; Auer, W.; Drillich, M.; Iwersen, M.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2019, 130, pp 19-25
Abstract

This work examined the downstream fetal and placental outcomes of introducing a cocktail of uterine-derived growth factors during bovine embryo culture. Abattoir-derived bovine oocytes were matured and fertilized in vitro. On day 4 post-fertilization, ≥8-cell embryos were harvested, pooled and...

Author(s)
Vailes, M. T.; McCoski, S. R.; Wooldridge, L. K.; Reese, S. T.; Pohler, K. G.; Roper, D. A.; Mercadante, V. R.; Ealy, A. D.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2019, 124, pp 1-8
Abstract

Although estrus detection makes a relevant contribution to the reproductive performance of dairy cattle, studies on the economic evaluation of automatic estrus detection systems are rare. The objective of the present study is to provide an economic evaluation of activity meters used for estrus...

Author(s)
Pfeiffer, J.; Gandorfer, M.; Ettema, J. F.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2020, 103, 1, pp 492-506
Abstract

In order to improve the detection rate of returning estrous cows via pedometer, the effects of season, parity and time of returning estrus on activity of breeding cows were investigated. The returning estrus situation and activity change of 214 multiparous cows after artificial insemination were...

Author(s)
Liu JiangJing; Chen XiaOli; Tian HongZhi; Lu YongQiang; Wang Dong
Publisher
Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, China
Citation
Acta Veterinaria et Zootechnica Sinica, 2019, 50, 7, pp 1405-1411
Abstract

Previous research has indicated that multiple small doses of GnRH following CIDR removal increased circulating concentrations of estradiol. Therefore, our objective was to determine if a single small dose of GnRH (5 µg or 10 µg) at CIDR removal would impact expression of estrus and/or interval to ...

Author(s)
Rich, J. J. J.; Northrop, E. J.; Larimore, E. L.; Perry, G. A.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2018, 119, pp 76-79
AbstractFull Text

The identification of cow estrus is an important part of dairy farm production activities and directly related to the economic benefits of dairy farmers. However, there were many problems in present methods for identifying cow estrus, including low efficiency, poor timeliness and low accuracy. To...

Author(s)
Tan Yi; He DongJian; Guo YangYang; Zhang ZiRu
Publisher
Journal of Agricultural Science and Technology, Beijing, China
Citation
Journal of Agricultural Science and Technology (Beijing), 2018, 20, 12, pp 83-90
Abstract

Most Canadian dairy herds operate in tiestall housing (61%), where average estrus detection rates may be lower than 54%. The objective of this study was to evaluate infrared thermography and behavioral biometrics as indicators of estrus in dairy cows. Eighteen cyclic multiparous cows (Synch) were...

Author(s)
Marquez, H. J. P.; Ambrose, D. J.; Schaefer, A. L.; Cook, N. J.; Bench, C. J.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2019, 102, 5, pp 4427-4440

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