HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Koger, M. Search for Related Content PubMed PubMed Citation Articles by Koger, M.

Efective Crossbreeding Systems Utilizing Zebu Cattle^{1 ,2,}

University of Florida, Gainesville 32611

Abstract

The basic objectives and procedures for successful crossbreeding of beef cattle were considered, with special reference to the levels of realized hybrid vigor that might be anticipated for different crossbreeding programs involving the American Brahman (Z₁) and European (E_j) breeds. Intralocus heterozygosis levels with respect to breed origin of genes (breed heterozygosis) were computed for various crossbreeding systems. These values were weighted by approximate relative F₁ heterosis levels for different breed combinations (1.0 for Z₁E_j and .3 for E₁E₂) to yield the estimated relative hybrid vigor levels for total performance in alternative crossbreeding systems. The estimated average maternal heterosis levels for the various systems, were respectively 0, 33, 67, 66, 50, 54 and 49% for production of F₁ (EZ) calves, three-breed terminal cross calves, two-breed-of-sire (E₁–Z₁) rotation crosses, three-breed-of-sire (Z₁ – E₁ – E₂) rotation crosses, two-breed (Z x E) synthetics, three-breed (Z₁ x E₁E₂) synthetics and four-breed (Z₁ E₁ x E₂E₃) synthetics. The respective values for calf heterosis levels were 50, 57, 67, 66, 50, 54 and 49%. Successful crossbreeding requires (1) the choice of appropriate breed combinations for the environment and production system management programs to support the increased production potential or crossbred cattle.

¹ Presented at a symposium on "The Role of Zebu Cattle in Efficient Beef Production" at the Annu. Meet, of the Southern Sec. of the ASAS, February 5, 1979, in New Orleans, LA.

² Florida Agr. Exp. Sta. Journal Ser. no. 1700. Contribution from the Southern Beef Cattle Breeding Project (S-10).

This article has been cited by other articles:

				W. E. Wyatt, T. D. Bidner, P. E. Humes, D. E. Franke, and D. C. Blouin Cow-calf and feedlot performances of Brahman-derivative breeds J Anim Sci, December 1, 2002; 80(12): 3037 - 3045. [Abstract] [Full Text] [PDF]

				J. A. Arango, L. V. Cundiff, and L. D. Van Vleck Breed comparisons of Angus, Brahman, Hereford, Pinzgauer, Sahiwal, and Tarentaise for weight, weight adjusted for condition score, height, and body condition score J Anim Sci, December 1, 2002; 80(12): 3142 - 3149. [Abstract] [Full Text] [PDF]