Oklahoma Farm Report masthead graphic with wheat on the left and cattle on the right.
Howdy Neighbors!
Ron Hays, Director of Farm and Ranch Programming, Radio Oklahoma Ag Network  |  2401 Exchange Ave, Suite F, Oklahoma City, Ok 73108  |  (405) 601-9211

advertisements
   
    
   
   
   
   

Agricultural News


How Late Summer Temperatures Can Shorten the Gestation Length of Your Fall-Calvers, OSU's Glenn Selk Explains

Tue, 30 Jul 2019 11:41:18 CDT

How Late Summer Temperatures Can Shorten the Gestation Length of Your Fall-Calvers, OSU's Glenn Selk Explains 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 explains how late summer temperatures can shorten the gestation length of fall-calvers.


"Each year in late July or August, it is time for an important reminder. Fall-calving season will soon be here. In fact, the start of the fall calving season often begins before some producers expect it. The target date for the beginning of fall calving very often is September 1. Most printed gestation tables predict that calving will take place 283 days (some 285 days) after artificial insemination or natural breeding. Cows and heifers that gestate in hot weather will often calve a few days earlier than expected.



"Oklahoma State University physiologists studied early fall (August) and late fall (October) calving cows. Data from two successive years were combined for 60 Angus X Hereford crossbred cows. The 'early' and 'late' fall calving cows had been artificially inseminated in early November or early January, respectively. Semen from the same sire was used for all cows. All cows were exposed to a single cleanup bull for 35 days at 4 days after the AI season. The weather prior to calving was significantly different for late pregnancy in the two groups. The average maximum temperature the week before calving was 93 degrees F. for the 'early' fall group. The average maximum temperature the week before parturition in the 'late' calving group was 66 degrees F. There was a 100% survival rate for calves in both groups and both groups of cows had very high re-breeding rates (90% and 92%, respectively).



"The average gestation length for the 'early' cows was 6 days shorter (279 days) as compared to the 'late' cows (285 days) in year 1. The average gestation length for the 'early' cows was 4 days shorter (278 days) as compared to the 'late' cows (282 days) in year 2. Keep in mind that the gestation lengths listed are AVERAGE. This means that about half of the cows calved earlier than that. Records from millions of Holstein dairy cows across the entire United States report a similar pattern (Norman, et al.2009 J. Dairy Sci; 92:5). Holsteins bred in January and February (calving in October and November) averaged 2 days longer gestation than did Holstein cows bred in October (calving in July and August). Many of these would be in Northern climates with less heat stress and more moderate temperatures in the summer months. Here in the Southern Plains, late summer heat is more intense and persistent. Therefore, producers with early fall-calving cows should expect calves to start coming several days ahead of the 'textbook gestation table' dates. They should begin their routine heifer and cow checks at least a week to 10 days ahead of the expected first calving date. Source: Kastner, et al. 2004 OSU Animal Science Research Report."




   

 

WebReadyTM Powered by WireReady® NSI

 


Top Agricultural News

  • Small Grains Summary Shows 2020 Oklahoma Wheat Crop at 104 Million Bushels  Wed, 30 Sep 2020 20:26:29 CDT
  • Oklahoma Grain Elevator Cash Bids as of 2:00 p.m Wednesday, September 30  Wed, 30 Sep 2020 17:47:15 CDT
  • Wednesday, September 30, 2020 Market Wrap-Up with Justin Lewis  Wed, 30 Sep 2020 15:04:22 CDT
  • Lucas Applauds U.S. Department of Commerce $2 Million Investment to Boost Business Growth in Woodward  Wed, 30 Sep 2020 13:50:01 CDT
  • Texas Tech Researcher Receives Additional Funding for Cattle Antimicrobial Resistance Research  Wed, 30 Sep 2020 12:53:41 CDT
  • OSU's Dr. Amy Hagerman Explains the Differences in CFAP1 and CFAP2 for Producers   Wed, 30 Sep 2020 15:12:19 CDT
  • USDA grants American Farmland Trust $2.6 million to improve Soil Health Practice Adoption on farms from Coast to Coast.  Wed, 30 Sep 2020 12:01:13 CDT
  • NIFA Invests Over $7 Million in Big Data, Artificial Intelligence, and Other Cyberinformatics Research  Wed, 30 Sep 2020 11:54:47 CDT

  • More Headlines...

       

    Ron salutes our daily email sponsors!

    Oklahoma Ag Credit Oklahoma Farm Bureau National Livestock Credit Ag Mediation Program P&K Equipment Tulsa Farm Show AFR Insurance Stillwater Milling Oklahoma Cattlemen's Association KIS FUTURES, INC.

    Our Road to Rural Prosperity sponsors!

    Banc First OPSRC ORWA TPAOO TPAOO

    Search OklahomaFarmReport.com


       
       
    © 2008-2020 Oklahoma Farm Report
    Email Ron   |   Newsletter Signup   |    Current Spots   |    Program Links

    WebReady powered by WireReady® Inc.