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Although Difficult, Producers Can Improve Fertility in Summer's Heat |
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Author: DeJarnette |
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State: US Year: 2004 |
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Excerpt: Heat-stressed cows do respond extremely well to prostaglandin injections. That’s why estrus-synchronization programs can be implemented effectively in conjunction with environment-management programs.
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Delayed effect of heat stress on steroid production in medium-sized & preovulatory bovine follicles |
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Author: Roth, Meidan, Shaham-Albalancy, Braw-Tal, Wolfenson |
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State: Israel Year: 2001 |
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Excerpt: These results demonstrate a delayed effect of heat stress on steroid production & follicular characteristics in both medium-sized & preovulatory follicles; this effect could be related to the low fertility of cattle in the autumn.
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Develop a Plan to Minimize the Adverse Affect of Heat Stress on Reproduction |
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Author: O'Connor |
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State: PA Year: 2004 |
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Excerpt: In addition to implementing heat abatement procedures there are management strategies that can be implemented to improve reproductive performance during the summer, e.g., Observe for estrus more frequently & during the cooler periods of the day…
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Effect of Gonadotropin-releasing Hormones at Estrus on Subsequent Luteal Function & Fertility in Lactating Holsteins During Heat Stress |
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Author: Ullah, Fuquay, Keawkhong, Clark, Pogue, Murphey |
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State: MI Year: 1996 |
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Excerpt: When pregnancy was diagnosed in these cows after d 45, pregnancy rates had decreased significantly for controls but not for cows given GnRH at estrus, suggesting greater embryonic survival in treated cows.
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Effect of Season & Exposure to Heat Stress on Oocyte Competence in Holstein Cows |
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Author: Al-Katanani, Paula-Lopes, Hansen |
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State: FL Year: 2002 |
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Excerpt: Results indicate that oocyte competence in Holstein cattle located in a warm climate declines during summer. It is possible that heat stress can damage the oocyte during
the period preceding antral follicle formation or that seasonal effects represent..
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Effects of Timed Insemination & Supplemental b-Carotene on Reproduction & Milk Yield of Dairy Cows Under Heat Stress |
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Author: Arechiga, Staples, McDowell, Hansen |
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State: FL Year: 1998 |
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Excerpt: Timed AI can improve pregnancy rates during periods of heat stress. Supplemental b-carotene may increase pregnancy rates for cows in the summer & can increase milk yield.
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Efficacy of Timed Embryo Transfer with Fresh & Frozen In Vitro
Produced Embryos to Increase Pregnancy Rates in Heat-Stressed Dairy Cattle |
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Author: Ambrose, Drost, Monson, Rutledge, Leibfried-Rutledge, M-J. Thatcher, Kassa, Binelli, Hansen, Chenoweth, W.W. Thatcher |
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State: FL Year: 1999 |
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Excerpt: Transfer of fresh IVF-derived embryos to heat-stressed dairy cattle increased pregnancy rates in the present study. Even under extreme heat stress conditions, cows in better body condition tend to have increased rates of pregnancy.
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Embryo Transfer That Works: Embryo Transfer As A Tool For Improving Fertility During Heat Stress |
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Author: Hansen, Jousan, Block |
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State: FL Year: 2004 |
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Excerpt: Provided one can obtain an inexpensive supply of embryos, & has personnel with the skill to transfer embryos, use of embryo transfer represents the best approach for increasing pregnancy rate during heat stress.
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Factors Affecting Seasonal Variation in 90-Day Nonreturn Rate
To First Service in Lactating Holstein Cows in a Hot Climate |
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Author: Al-Katanani, Webb, Hansen |
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State: FL Year: 1999 |
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Excerpt: Results obtained from analysis of data of cows inseminated in south Georgia & Florida indicated that the magnitude of the summer decline in 90-d noneturn rate depends on location & ME milk yield. Efforts to improve fertility in summer by cooling cows …
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Get Ready, Summer's Coming |
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Author: DeJarnette |
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State: US Year: 2002 |
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Excerpt: Although there are numerous "cures" we can adopt to minimize stress & improve breeding efficiency of animals during the summer months (i.e., shade, fans, sprinklers, etc), the best alternative is to "prevent" animals from needing to be inseminated durin
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