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Pedigree Promise and Progeny Test among Sires Proved in Iowa Cow Testing Associations¹

Iowa State College, Ames, Iowa, and Guernsey Breeders Association, Peterboro, N. H.

ABSTRACT

A study of the pedigrees of 303 Holstein-Friesian bulls proved in Iowa Cow Testing Associations before 1936 showed:

1. That the bulls with A.R. testing in their pedigrees were used in higher producing herds and had higher producing daughters than the bulls without such testing but, because of the higher production of their mates, the bulls with testing in their pedigrees did not increase the production of their daughters any more than the others did.
   
2. The correlations between ancestor's A.R. records and the bull's progeny performance were prevailingly positive but were so small as to be statistically insignificant on the amount of data available.
   

Although so limited in amount as to make them subject to large sampling errors, the data are compatible with the general conclusion that it is desirable to select bulls which have tested ancestors and whose tested ancestors have high records but that one can expect to gain in the daughters of such bulls only a small fraction of that superiority which their tested ancestors showed, as compared with the breed average.

¹ Journal paper No. J-510 from the Iowa Agricultural Experiment Station.