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- W1973148439 abstract "Thirty-four lactating Holstein cows were dried off 60 d prior to their expected calving date, paired by calving date, and randomly assigned to one of two photoperiod treatments: long-day photoperiod (n = 18; 16 h light: 8 h dark/d) or a short-day photoperiod (n = 16; 8 h light: 16 h dark/d) to determine if manipulation of photoperiod during the dry period would impact milk yield in the subsequent lactation. At parturition, calf weight, height, and length were measured and the cows were moved into ambient lighting conditions (November 1996 to January 1997 and November 1997 to January 1998, 39 degrees latitude) with the rest of the University of Maryland herd. After parturition, milk yield and composition were measured for 16 wk. Prolactin concentrations were higher by 11.7 ng/ml in the long-day photoperiod treatment group than for the cows on a short-day photoperiod. During lactation cows previously exposed to a short-day photoperiod produced 3.2 kg/d more milk than long-day photoperiod cows. Energy-corrected milk yield was greater in short-day photoperiod than in long-day photoperiod cows. Treatment did not affect calf growth, milk composition, or plasma insulin growth factor I concentrations. In conclusion, manipulation of photoperiod during the dry period of dairy cows may be a useful management tool for increasing milk yield in the subsequent lactation." @default.
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- W1973148439 date "2000-05-01" @default.
- W1973148439 modified "2023-10-14" @default.
- W1973148439 title "Effects of Photoperiodic Manipulation During the Dry Period of Dairy Cows" @default.
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- W1973148439 doi "https://doi.org/10.3168/jds.s0022-0302(00)74960-5" @default.
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