Considerations for early pregnancy diagnosis and weaning

By Kacie McCarthy, UNL Cow-Calf Specialist and Lindsay Waechter-Mead, DVM, Nebraska Extension Beef Educator

With areas across the state either dealing with drought or wet conditions, cow management and limited forage resources may have producers considering options for early weaning and utilizing early pregnancy detection to help make culling and management decisions this year.

Value of Pregnancy Detection and Culling Considerations

Early pregnancy diagnosis allows managers to make decisions on keeping, selling or even re-breeding females. Pregnancy detection via rectal palpation can be determined as early as 35-45 days whereas ultrasonography can determine pregnancy as early as 30 days. One alternative could be the implementation of blood tests, which have been proven to accurately detect pregnancy as early as 28-32 days. To learn more about advantages and disadvantages, please visit the past article to better understand how to approach early pregnancy detection with your herd this summer and fall.

Utilizing pregnancy detection as early as 35 days allows producers to target different markets and conserve forage resources. If producers need to cull cows, some criteria to consider may include physical impairments, older mature cows, cows with low production records or weaning weights, and non-pregnant cows. Learn more about how implementing timely pregnancy detection as a tool can help make decisions in a past webinar: https://youtu.be/OU__mDl8Ty4.

Early Weaning Considerations

As we think about limited forage resources and cow productivity, considering ways to reduce the nutritional demand of lactation can significantly help first-calf heifers and cows. Weaning calves earlier can significantly reduce cow nutrient requirements and decrease dry matter intake, as well as allow available forage to match cow nutrient requirements more closely. Two-year old cows still have a growth requirement which results in additional nutritional demands during lactation. By weaning early, nutritional demands are decreased and allows heifers and cows a chance to regain or maintain body condition in late summer and fall. The difference in forage intake between lactating and non-lactating cows is about 5 pounds of forage per head per day. Additionally, about 10 pounds of forage is conserved for each day a calf is weaned. Early weaning is typically defined as weaning calves before 150 days of age. In extreme cases, such as drought, calves may be weaned at 45 days of age, but more commonly are over the age of 90 days.

If you are considering early weaning, feeding, management, and marketing options should be considered prior to weaning day. A recent CAP webinar discusses options for early weaning calves and tips on planning and preparing for the process. For more information on weaning calves, producers can access the following NebGuides: NebGuide G2047 Management of Early Weaned Calves or NebGuide G2057 Management, Health, and Nutritional Considerations for Weaned Calves. In addition to early weaning, confined feeding may also be an option if resources need to be conserved. Learn more about confined feeding options from a past webinar: https://youtu.be/PBFA-F6sc7k.

Important dates August 5

August 5, 1583 - The first British colony in North America was founded by Sir Humphrey Gilbert, a British navigator and explorer. He sighted the Newfoundland coast and took possession of the area around St. John’s harbor in the name of the Queen. He was later lost at sea in a storm off the Azores on his return trip to England.

August 5, 1861 - President Abraham Lincoln signed into law the first Federal income tax, a 3 percent tax on incomes over $800, as an emergency wartime measure during the Civil War. However, the tax was never actually put into effect.

August 5, 1962 - Film star Marilyn Monroe died at age 36 from an overdose of sleeping pills. She made 29 films during her career and came to symbolize Hollywood glamour.

August 5, 2011 - Standard & Poor’s credit rating agency downgraded the United States debt from its highest rating of AAA to a lesser AA+ rating, marking the first-ever decline of credit worthiness for the U.S. The agency cited America’s $14 trillion in outstanding debt and ineffective political leadership regarding debt reduction.

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