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Improve Reproductive Performance in Your Cow Herd Using Calf Removal
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Permanent Link: http://ufdc.ufl.edu/IR00001643/00001
 Material Information
Title: Improve Reproductive Performance in Your Cow Herd Using Calf Removal
Physical Description: Fact Sheet
Creator: Hansen, Gary R.
Publisher: University of Florida Cooperative Extension Service, Institute of Food and Agriculture Sciences, EDIS
Place of Publication: Gainesville, Fla.
Publication Date: 2006
 Notes
Acquisition: Collected for University of Florida's Institutional Repository by the UFIR Self-Submittal tool. Submitted by Melanie Mercer.
Publication Status: Published
General Note: "Original publication date September, 2006."
General Note: "AN166"
 Record Information
Source Institution: University of Florida Institutional Repository
Holding Location: University of Florida
Rights Management: All rights reserved by the submitter.
System ID: IR00001643:00001

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AN166 Improve Reproductive Performance in Your Cow Herd Using Calf Removal1 Gary R. Hansen2 The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. U.S. Department of Agriculture, Cooperative Extension Service, University of Florida, IFAS, Florida A. & M. University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Larry Arrington, Dean Short-Term Calf Removal

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Improve Reproductive Performance in Your Cow Herd Using Calf Removal 2 Once-Daily Suckling

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Improve Reproductive Performance in Your Cow Herd Using Calf Removal 3 Early Weaning Determining Which Method of Calf Removal to Use

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Improve Reproductive Performance in Your Cow Herd Using Calf Removal 4 Calf Performance Following Calf Removal Summary Literature Cited 2)Tj/C2_0 11 Tf0 Ts <001100030003>Tj0 -14 TD<0037004B00480055004C0052004A004800510052004F0052004A005C000300170016001D001700130014001100030003>TjET

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Improve Reproductive Performance in Your Cow Herd Using Calf Removal 5 Table 1. Estrus Response, Pregnancy Rate and First Service Conception Rate in Beef Cows Following Short-term Calf Removal. Number Cows No. Exhibiting Estrus During Short-Term Calf Removal % Pregnant First Service Conception Rate 60 48/60 (80%) 60% (36/60) 75% (36/48) Hansen, Unpublished data Table 2. Effect of Synchronization Treatment With or Without Calf Removal on Estrus and Pregnancy Rates. Treatment 5 Day Estrus Rate Synchronized Conception Rate 25 Day Pregnancy Rate Control 34.5% 89.4% 78.2% MGA-PGF 64.8% 68.6% 74.7% MGA-PGF-CR 61.8% 85.3% 90.9% MGA = melengestrol acetate PGF = Prostaglandin F2a CR= 48 hour calf removal (Yelich et al., 1995) Table 3. Determining Which Method of Calf Removal to Use. Cow Agea BCSb Days Postpartum Labor Nutritional Stressc Facilities Calf Removal Methodd Young < 4.0 > 60 Limited S Poor EW Young > 5.0 > 45 Limited M Average STRC Young > 4.5 > 45 Unlimited M Good ODS Mature > 4.5 35-45 Limited M Average STRC Mature < 4.0 > 45 Limited S Average EW Mature > 5.0 > 60 Limited N Poor STRC Aged > 5.0 > 60 Limited S Average EW/STRC Aged < 4.5 35-60 Limited S Poor EW Aged > 4.5 35-45 Unlimited M Average ODS/STRC aCow Age: Young = 2-3 years old; Mature = 4-9 years old; Aged = 10+ years old bBody Condition Scores: 1 = emaciated, 9 = obese cNutritional Stress: S= Severe; animals are losing body condition, M= Moderate; animals are maintaining body condition, N= Negligible; animals are gaining body condition. dCalf Removal Method: EW= Early wean; ODS= Once-daily suckling; STRC = 48 hour calf removal.