Here is a newsletter article on the subject of labor and intervention by Dr. Glenn Selk of Oklahoma State University.
COW/CALF CORNER
The newsletter
January 21, 2005
In this issue:
When do we intervene and assist a cow or heifer in labor?
Glenn Selk, OSU Extension Cattle Reproduction Specialist
Spring calving season is upon the Oklahoma ranches that have spring calving. An issue facing the rancher at calving time, is the amount of time heifers or cows are allowed to be in labor before assistance is given. Traditional text books, fact sheets and magazine articles have sometimes stated that "Stage II" of labor lasted from 2 to 4 hours. "Stage II" is defined as that portion of the birthing process from the first appearance of the water bag until the baby calf is delivered. Newer data from Oklahoma State University and the USDA experiment station at Miles City, Montana clearly show that Stage II is much shorter, lasting approximately 60 minutes in first calf heifers, and 30 minutes in mature cows.
Table 1. Research Results of Length of Stage II of Parturition (Calving)
Research site
Number of cattle
Average Length of Stage II of Parturition
USDA (Montana)
24 mature cows
22.5 minutes
USDA (Montana)
32 first calf heifers
54.1 minutes
Oklahoma State Univ.
32 first calf heifers
63.4 minutes
In these studies, heifers that were in stage II of labor much more than one hour or cows that were in stage II much more than 30 minutes definitely needed assistance. Research information also shows that calves from prolonged deliveries are weaker and more disease prone, even if born alive. In addition, cows or heifers with prolonged deliveries return to heat later and are less likely to be bred for the next calf crop. Consequently a good rule of thumb is: If the heifer is not making significant progress 1 hour after the water bag or feet appear, examine the heifer to see if you can provide assistance. Mature cows (making little or no progress) should be watched for only 30 minutes before an obstetrical examine is conducted. If you cannot safely deliver the calf yourself at this time, call your local veterinarian immediately. Know your own limitations and give your veterinarian the best chance to help the cow and you.
Most ranches develop heifers fully, and use calving ease bulls to prevent calving difficulties. However, a few difficult births are going to occur each calving season. For the optimum health of the calf and the best future reproductive performance of the mother, stage II of labor should not be allowed to greatly exceed the averages shown in Table 1.
Pretty much in line with "our" Cattle Today Gurus! ;-)