Agronomy journal, Vol. 42 No. 2, 1980.
Original scientific paper
THE EFFECT OF THE AGE AT FIRST CALVING ON THE LEVEL OF MILK PRODUCTION IN THE FIRST LACTATION
Ivan Jurić
; Fakultet poljoprivrednih znanosti Zagreb, OOUR Institut za stočarstvo i mljekarstvo
Marija Đikić
; Fakultet poljoprivrednih znanosti Zagreb, OOUR Institut za stočarstvo i mljekarstvo
Abstract
The effect of the age at first calving on the level of milk production during 305 days in first lactation was investigated in 130 simmental cows. The average age first calving was 829,11 days with range from 665 to1,252 days. The average milk production was 3.732.81 kg and 3,606.41 kg FCM with range from 2.614 to 5.735 kg and from 2.426 to 5615 kg FCM. Coefficient of regression between age at first calving and milk production in kg was 0.3624, and between age and milk yield in kg FCM 0.5509. Relation is given by coefficient of correlation which was found to be 0.7015 for the dependence of milk yield in kg on age, and to be 0.1087 for the case of yield in term of FCM.
Keywords
Hrčak ID:
165819
URI
Publication date:
19.5.1980.
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