
%0 Journal Article
%A Dolby, GR 
%T A comparison of monthly and bi-monthly production records of Queensland dairy cows
%J Australian Journal of Experimental Agriculture
%D 1969/10/01
%V 9
%N 40
%P 490-492
%K 
%R https://doi.org/10.1071/EA9690490
%U https://www.publish.csiro.au/paper/EA9690490 
%X Monthly records of butterfat production for 27 herds over three years, comprising 4505 complete lactations, were used to compare three estimates of the total yield : namely, those based on monthly records, records for the odd alternate months and records for the even alternate months. Although there were frequently large differences between monthly and bi-monthly estimates of individual productions, cows were ranked similarly within herd and year by both methods of testing. However, comparison of herd averages indicated that bi-monthly records are not suitable for between-herd comparisons. Sire ratings calculated from the three sets of records were similar and the rankings of bulls within herds were almost identical. 
