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Agricultural News

Dr. Glenn Selk Suggests Comparing Weaning Dates for Fall Calving Cows

Tue, 21 Mar 2017 13:37:01 CDT

Dr. Glenn Selk Suggests Comparing Weaning Dates for Fall Calving Cows Dr. Glenn Selk, Oklahoma State University Emeritus Extension Animal Scientist, offers herd health advice as part of the weekly series known as the "Cow Calf Corner" published electronically by Dr. Peel and Dr. Glenn Selk. Today, Dr. Selk reminds producers that theu may want to consider adjusting weaning dates for fall calving cows this spring- based on environmental factors.

"Producers with fall-calving herds have traditionally weaned the calves at 9 to 10 months of age. When forage growth is limited due to drought, questions arise about the feasibility of weaning the calves at an earlier date. The effect on the cow as well as weaning weight of the calf must be considered when the impact of the weaning date is considered.

"Oklahoma State University animal scientists evaluated weaning dates of 158 Angus fall-calving cows over a 4 year period. Cows were allowed to nurse their calves for about 210 days (April Weaning) or 300 days (July Weaning). All cows calved in September or October and were weaned in mid-April (April Wean) or mid-July (July Wean). April-weaned young cows had greater re-breeding percentages (98.4% versus 89.3%) than July weaned young cows. However, there was no advantage in the re-breeding performance of April-weaned mature cows compared to July-weaned mature cows (90.2% versus 96.7%). April-weaned cows were heavier and fleshier at calving than July weaned cows.

"Calves weaned in July were 90 days older and 204 pounds heavier (642 lb versus 438 lb) when weaned than were the April-weaned calves. The April-weaned calves were allowed to graze native pasture after weaning and weighed 607 pounds in mid July. For most years, it appears more advantageous to delay weaning of calves born to cows 4 years or older to July while maintaining April weaning for cows 3 years of age or younger.   On-going drought conditions (or burned pastures) in some areas of the Southern Plains very well may suggest the earlier weaning date could be considered for all ages of cows."

Source- Dr. Glenn Selk



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