DSD 6.6 | How much variation is allowable? from Dairy Science Digest

DSD 6.6 | How much variation is allowable?

33 minutes Posted Jun 16, 2025 at 8:27 pm.

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 cosync10:18 Exp. 2: Optimal time of sexed semen breeding11:43 Fig. 4: CR of Beef vs sexed semen 13:24 P/AI Results, sexed semen14:34 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. 223:36 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?

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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.

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