Crossbreeding Systems in Beef Cattle
http://edis.ifas.ufl.edu/ ( Publisher's URL )
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Permanent Link: http://ufdc.ufl.edu/IR00001642/00001
 Material Information
Title: Crossbreeding Systems in Beef Cattle
Physical Description: Fact Sheet
Creator: Hansen, Gary
Publisher: University of Florida Cooperative Extension Service, Institute of Food and Agriculture Sciences, EDIS
Place of Publication: Gainesville, Fla.
Publication Date: 2006
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: "AN165"
 Record Information
Source Institution: University of Florida Institutional Repository
Holding Location: University of Florida
Rights Management: All rights reserved by the submitter.
System ID: IR00001642:00001


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AN165 Crossbreeding Systems in Beef Cattle1 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


Crossbreeding Systems in Beef Cattle 2 Bos indicus Bos indicus Bos taurus Bos indicusBos taurus Bos taurusBos taurus


Crossbreeding Systems in Beef Cattle 3 Reference


Crossbreeding Systems in Beef Cattle 4 Table 1. Expression of heritability and heterosis in traits of economic importance in beef cattle production Trait Heritability % Heterosis % Reproduction Low (5-12%) 20 Maternal Low to Moderate (>20%) 15 Growth Moderate (20-40) 5-12 Product High (40-50) NIL* *insignificant Table 2. Average heterosis in the economically important beef traits when crossing divergent breed types of cattle. Trait Bos taurus X Bos taurus % Bos indicus X Bos taurus % Individual Heterosis (Calf Performance) Birth weight 2.4 11.1 Weaning weight 3.9 12.6 Post-weaning gain 2.6 16.2 Maternal Heterosis (Cow Performance) Calving rate 3.7 13.4 Calf survival 1.5 5.1 Birth weight 1.8 5.8 Weaning weight 3.9 16.0 Adapted from Cundiff et al., 1994 Table 3. Cow Type % Pregnant Weaning Wt (Lbs) No of Records Hereford 82 492 52 Angus 84 498 68 Brahman 79 513 37 Angus Cross 86 523 63 Brahman X Hereford 97 619 128 Angus X Brahman 96 612 89 Hansen, unpublished data


Crossbreeding Systems in Beef Cattle 5 Table 4. Estimated Weaning Weight Performance Factors for Various Crossbreeding Systems System Breed Complementarity Potential Management Ease Calf Heterosis Hi Maternal Heterosis Hm Hiefer Replacements Estimated Herd Production Factor Straightbred Herd1 No + 0% 0% Raised 1.00 F-1 Cow System2 Yes + 100% 0% Purchased 1.10 F-1 Cow Terminal Calf3 Yes + 100% 100% Purchased 1.25 2-Breed Rotation4 No 67% 67% Raised 1.17 3-Breed Rotation5 No 85.7% 85.7% Raised 1.21 4-Breed Composite6 No + 75% 75% Raised 1.19 1Straightbred HerdCows and bulls from the same breed are mated. 2F-1 Cow SystemCows from one breed are mated to bulls of another breed. All calves are marketed with replacements coming from an outside source. 3F-1 Cow/Terminal CalfF-1 cows are mated to a breed that is different from the parent breeds of the F-1 cow. All calves are marketed and replacements are purchased. 42-Breed RotationTwo breeds are mated by crisscrossing between breeds. Cows from breed A are mated to bulls of breed B and vice versa. 53-Breed RotationThree breeds are mated in rotation. Cows from breed A are mated to bulls from breed B. Daughters from this cross (1/2 A 1/2 B) are mated to bulls of breed C. Daughters from this cross (1/4 A 1/4 B 1/2 C) are mated to bulls of breed A. The rotation continues on in this fashion for as long as the system is used in the herd. 64-Breed CompositeUse of four breeds in the development of a composite animal that has an exact percent of each breed in its genetic make up.