Age-Season Adjustment Factors Considering Herd Feeding Practices

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Abstract
The influence of percent of net energy in the herd''s ration derived from concentrates on age-season effects was studied in New York [USA] Holstein Dairy Herd Improvement records. Ten feeding groups were defined by herd-feeding information. There was some increase in milk yield with an increasing proportion of concentrates in the ration. For 6 of these groups, the 2 highest, 2 middle and 2 lowest in percent net energy from concentrates, age-season effects were calculated. The trends in age effects and seasonal effects were similar for all groups with the groups having a higher fraction of net energy from concentrates showing relatively higher mature milk yield. The multiplicative age-season factors calculated from the age-season solutions were similar for all groups, indicating that the proportion of concentrates over the current range does not have an important influence on age-season factors.

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