DSD 5.11 | Subtle Sync changes to synergize estrus with ovulation

Dairy Science Digest

Reproductive physiologists are always trying to improve conception rates for the dairy herd. Double ovsync is one of the best tools in our toolbox to submit cows to first insemination. However, as estrus detection technology becomes more affordable and we learn more about physiology, perhaps combining the expression of estrus at insemination may improve fertility through optimizing ovulation timing.

Dr. Julio Giordano and Ana Laplacette worked with their Cornell reproduction team to investigate this theory on over 4600 cows in 2 commercial herds. “We are trying to take advantage of the power of sync of ovulation and the power of estrus” Giordano explains. “To get the best of both, synergize the two.”

The only change to the well-known Double ovsync protocol includes a delay in the final administration of GnRh before breeding. The goal, allowing the cows more time to show estrus. Take a moment to listen in to better understand the physiology of this synchronization program and how to improve your herd’s reproductive management.

Topics of discussion

2:03 Introduction of Dr. Julio Giordano & Ana Laplacette
3:37 Why introduce Estrus detection to double ovsync?
6:25 Treatment description, Double ovsync
9:12 Did you cherry pick?
10:04 What metrics do you focus in on to determine the success of synchronization protocol
11:36 Considerations to grouping animals to best understand the data
13:57 How did you determine “heat”
15:23 Specific difference between G56 and G80 treatments
16:38 Increase in Estrus observed 2.2% vs 29.9%
17:09 Three types of cows –
(1) Show estrus without GnRh, 1/3
(2) Show estrus after GnRh, 1/3
(3) Never show estrus, 1/3
20:01 Anestrus cows – table 5
22:16 Follicle size differences between treatment
26:12 Did it work? Take home message for boots on the ground dairy producers
30:41 What is the difference between the estrus and non-estrus cows?
32:16 Follow up project: Give cows 1 week to show estrus after PGH of breeding OvSync

Featured Article:

Delaying induction of ovulation and timed AI in a Double-Ovsynch protocol increased expression of estrus and altered first service reproductive outcomes of lactating dairy cows

#2xAg2030; #journalofdairyscience; #openaccess; #MODAIRY; #DoubleOvSync; #G56; #G80; #cherrypick; #sync; #estrus; #dairy; #Lut; #GnRH; #conceptionrate; #dairysciencedigest; #ReaganBluel;