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Journal of Dairy Science Vol. 69 No. 2 591-594
© 1986 by American Dairy Science Association ®
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Relationships Between Predicted Difference for Milk Production Traits and Buck Designation in Dairy Goats1

T. A. Gipson, M. Grossman2 and R. L. Fernando

Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana 61801

2 Reprint requests

ABSTRACT

A total of 3344 summary records were used from purebred and American registered bucks for the Alpine, LaMancha, Nubian, Saanen, and Toggenburg breeds to study associations of Predicted Difference for milk yield, milk fat yield, and fat percentage with buck designation. Designations are combinations of stars (0 or 1) based on pedigree performance and pluses (0, 1, or 2) based on progeny performance. The model used for analysis generally included registration (purebred or American), star, linear plus, quadratic plus, and two-way interactions. Effects of registration for milk production traits were not significant. The effect of star was positive for milk in Alpines and fat percentage in Nubians but negative for fat percentage in Alpines. The linear effect of plus was positive for milk and fat in Alpines and Nubians and for fat percentage in Saanens but negative for fat percentage in Toggenburgs. The quadratic effect of plus was negative for milk in Alpines, LaManchas, and Nubians, for fat in Alpines and Nubians, and for fat percentage in Saanens. There was interaction of star with linear plus for fat in Nubians and Toggenburgs and for fat percentage in Saanens. There was also interaction of star with quadratic plus for milk in Nubians and Saanens, for fat in Nubians and Toggenburgs, and for fat percentage in Saanens. Other two-way interactions were not significant, except registration with star for fat in Nubians.

FOOTNOTES

1 Supported in part by the Illinois Agricultural Experiment Station and the University of Illinois Research Board.






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Copyright © 1986 by the American Dairy Science Association ®.