Reproductive Management

Resistance to heat stress is under genetic control

One of the major factors limiting optimal production and profitability in Florida is heat stress. During the summer, cows experience declines in milk yield of 15 to 20 percent and reduction in conception rate to values as low as 10 percent. Recent research supported by the Southeast Milk Inc. Dairy Checkoff Program indicates that a cow’s ability to regulate its body temperature and prevent the negative effects of heat stress on cow function is determined in part by its genetics. What that means is that it should be possible to select cows genetically that are more resistance to the effects of heat stress. FULL STORY »

Analyze the economics of your dairy’s reproductive program

Quickly, what is the cost-benefit of improving your 21-day pregnancy rate from 15 percent to 20 percent? Not many farmers can accurately answer that off the top of their head. But that information can be critical to your profitability. To help calculate the right response for your farm, check out the “Dairy Reproductive Economic Analysis” tool from the University of Wisconsin, Madison. FULL STORY »

Reducing follicle dominance in timed AI programs

Recent research evaluated the effects of the period of follicle dominance in a timed-artificial insemination (AI) protocol and its effect on conception rate in 4,098 dairy cows. FULL STORY »

Adjustments to all cow PTA's coming next month

Beginning with the April 2011 genetic evaluations, USDA-AIPL will adjust the PTAs on all Holstein, Jersey and Brown Swiss cows, whether genomic tested or not, to make all evaluations more directly comparable. FULL STORY »

Johne’s disease has a negative influence on reproduction

The effect of Mycobacterium avium ssp. paratuberculosis (MAP) on dairy reproduction and culling is among the least documented cost attributed to this infection. Research published in the August 2010 Journal of Dairy Science offers some insight to this influence. FULL STORY »

Wanted: Nominations for herds with excellent reproduction

The Dairy Cattle Reproduction Council (DCRC) is looking to recognize dairy producers through its Reproduction Award Program for accomplishing reproductive efficiency with well-implemented management procedures. FULL STORY »

Genetic progress forges ahead

The modern dairy cow is a remarkable feat of genetic progress. Check out this podcast for more of University of Wisconsin Extension Dairy Geneticist Kent Weigel’s perspective on how dairy genetics work on the farm, new genetic technologies and what the genetic future holds. FULL STORY »

Wanted: High-producing, healthy fresh cows with excellent reproduction

If ever a dairy producer were to post a “wanted” poster for the ideal dairy cow, she would produce large volumes of high-quality milk, remain healthy through the most trying time of her life—the transition period—and be able to be bred back in a timely manner. However, these three factors—production, reproduction and transition—often translate to conflicting performance in the fresh pen, which has direct and defined implications on future reproductive performance. FULL STORY »

The effects of supplemental fatty acids on uterine health, metabolic responses, reproduction and milking performance

The objectives of the study were to evaluate the effects of timing of supplementation of different calcium salts of fatty acids on metabolic status, uterine health, pregnancy, pregnancy losses after two breedings and milk yield. FULL STORY »

AI teaching tool available

This CD is a good first step in learning the basics of the insemination process and would make a nice addition to your dairy’s reference and training library. It is available in English and Spanish versions and offers an overview of the tools and procedures needed to understand artificial insemination in dairy cows. FULL STORY »

Track difficult calvings to gain profit

Data that reveal the expected calving difficulty for specific bulls within breeds can generate huge cost savings in the long run for all producers in the industry, say experts at the University of Minnesota. Therefore, they say, if you get a handle on your herd's calving difficulty, you can make decisions that reduce financial loss. FULL STORY »

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