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Studies on effect of days open for milk yield in dairy cattle



Studies on effect of days open for milk yield in dairy cattle



Seoul National University Journal of Agricultural Sciences 13(2): 1-4



This study was carried out to estimate relationships between days open and milk yield at 305 day and according to season of freshing. Data used for this study included a total of 3,266 sets of 305 day lactation records of Holstein cows tested milk yield performance in National Animal Breeding Institute from 1971 to 1987. Parity, year at calving and days open showed highly significant (p < 0.01) effects on actual and age-corrected milk yields in the first season of refreshing. Days open affected on age-corrected milk yield significantly (p < 0.05) and parity and year at calving also effected significantly (p < 0.01) on milk record in the second season of refreshing. As days open increased from 20 to 200 days, actual and age-corrected milk yield increased from 4,998 kg and 5,415 kg to 5,290 kg and 5,702 kg in the first season, respectively. In the second season, actual and age-corrected milk yields were also affected by period of days open.

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Accession: 007831775

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