DSD 6.6 | How much variability is allowable?

Timing of insemination is still one of the most common question Dr. Paul Fricke, Extension faculty for the University of Wisconsin, gets from farmers. This month he and coauthors Vanda Santos and Paulo Carvalho  discuss the ideal timing of insemination when using popular artificial insemination protocols and when producers use estrus detection devices.

Additionally, how does this change if you choose to use sexed semen or a straw of beef?

Listen in to learn how to improve the pregnancies / AI metric in YOUR herd.

Topics of discussion

1:36       Introduction of Dr. Paul Fricke, Vanda Santos and Paulo Carvalho

2:48       OvSync history (1995):  0, 8, 16, 24 or 32 hours - timing of insemination

6:39        Exp. 1: Study Design – 0 vs 16 hour 

7:55       Conception reductions due to cosync

10:18     Exp. 2: Optimal time of sexed semen breeding

11:43     Fig. 4: CR of Beef vs sexed semen    

13:24      P/AI Results, sexed semen

14:34     ReSync protocol - GGPPG

16:10     Exp. 3: Electronic estrus detection

18:00      Fig. 4: Conception, Early (0-2 hr) vs Late (20-25 hr)

19:49    Conception 13-23 hours after estrus detection

22:03      Raw data points on fig 3, Exp. 2

23:36      Fig 2: Early (0-2 hr) vs Ideal (15-16 hr)

24:27      Once a Day Breeding, killing the AM/PM rule

26:00     Expected pregnancy loss

28:49      What do you want “boots on the ground” dairymen to learn from this project?

Featured Article:

Effect of timing of artificial insemination with conventional or sex-sorted semen on fertility of lactating dairy cows

#2xAg2030; #journalofdairyscience; #openaccess; #MODAIRY; #conception; #ovsync; #doubleOvsync; #sexedsemen; #cosync; #resync; #pregnancyloss; #AM/PMrule; #dairysciencedigest; #ReaganBluel