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Studies on Bovine Ocular Squamous Carcinoma ("Cancer Eye") XIV. Heritabilities, Phenotypic Correlations, and Genetic Correlations Involving Corneoscleral and Lid Pigmentation¹

The University of Texas M. D. Anderson Hospital and Tumor Institute, Houston and Turner Ranch, Sulphur, Oklahoma

Abstract

Paternal half-sib analyses of variance and covariance were employed in estimating intra-age heritabilities, phenotypic correlations, and genetic correlations involving corneoscleral and lid pigmentation measurements on 548 purebred Hereford cattle.

Estimates of heritability ranged from 0.60 to 1.09 for corneoscleral pigmentation and from 0.27 to 1.37 for lid pigmentation. Phenotypic correlations were generally low and varied from 0.01 to 0.35, while the genetic correlations were moderately high and ranged from 0.55 to 0.62. These results, added to previous information obtained from studies concerning the relationship between pigmentation and lesions, are construed to indicate that the frequency of eyeball lesions would decline as a result of effective selection for lid pigment.

¹ This is publication number 14 of the Cancer Eye Study Section. This investigation was supported in part by grant G-1 from the American Cancer Society and Grants C-1751 and C-2890 from the National Cancer Institute of the National Institutes of Health, Public Health Service.

² Present address: Department of Animal Husbandry, Virginia Polytechnic Institute, Blacksburg.

³ Department of Biology, The University of Texas M. D. Anderson Hospital and Tumor Institute, Houston. 4 Ranch Veterinarian. Turner Ranch, Sulphur, Oklahoma.

⁴ Ranch Veterinarian. Turner Ranch, Sulphur, Oklahoma.

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