Pedigree Indexing of Imported American Brahman Breeder Cattle in the Philippines

Abstract

Pedigree data were used to predict the performance of 1,166 imported American Brahman breeder cattle, composed of 104 bulls and 1,062 heifers with an average age of 24.4 months (range of 17 to 40 months). A total of 13 full sib, 10 maternal half sib, and 228 paternal half sib groups were identified, each with average group size of 2.08, 2.00, and 4.49, respectively. Only 758 (64.9% of total) imported cattle were found to have at least one ancestor with expected progeny differences (EPDs) reported in the Spring 1995 Brahman Sire Summary. Moderate average accuracy values of .71, .69, .52, and .52 for birth weight, weaning weight, yearling weight, and maternal milk, respectively, were noted for EPDs of the ancestors. Prediction equations were derived by multiple regression analysis of available EPDs of sire, paternal grand sire, and maternal grand sire. Based on pedigree indexes that involve various combinations of available ancestral information, the average predicted EPDs (lbs) for imported cattle were 1.76 ± 0.54, 14.93 ± 4.86, 25.10 ± 9.50, and 5.86 ± 2.08 for birth weight, weaning weight, yearling weight, and matermal milk, respectively. Significant correlations (p < .05) were also found between sire and son EPDs (+.27) for yearling weight; and between sire and paternal grand sire EPDs for birth weight (+.34), weaning weight (+.51), yearling weight (+.49), and maternal milk (+.55).

Source or Periodical Title

Asian-Australasian Journal of Animal Sciences

ISSN

10112367

Page

614-620

Document Type

Article

Subject

Expected Progeny Differences (EPD), Imported American Brahman Cattle, Pedigree Index

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