
TY  - JOUR
A1  - Dolby, GR 
T1  - A comparison of monthly and bi-monthly production records of Queensland dairy cows
JF  - Australian Journal of Experimental Agriculture
JO  - Aust. J. Exp. Agric.
Y1  - 1969
VL  - 9
IS  - 40
SP  - 490
EP  - 492
KW  - 
UR  - https://doi.org/10.1071/EA9690490 
N2  - 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. 
ER  -

