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Cows were randomly assigned to 1 of 2 treatments; (1) once-a-day milking for the entire lactation (OAD) and (2) twice-a-day milking for the entire lactation (TAD; control). Mean calving dates for yr 1, 2, and 3 were February 17, 2019 (±18.5 d), February 16, 2020 (±18.3 d...
once a daytwice a dayThis study evaluated the concentration and expression of lactoferrin (LF) in cows selected for once a day (OAD) milking compared to twice a day (TAD) milking. Milk samples were collected from the Massey University TAD and OAD herds. Milk traits and expression of LF ...
once a day milkingenergy statusmetabolic diseaseThis randomized controlled trial investigated the effects of temporarily reducing milking frequency (MF) on the resolution of ketosis and milk production in dairy cows in early lactation. To detect ketosis [blood β-hydroxybutyrate (BHB) ≥1.2 mmol/L],...
Milking frequencydairy cattleNew Zealandmilk yield traitslactation persistencyThe objective of this study was to compare Holstein-Friesian (F), Jersey (J) and crossbred (F × J) cows milked once-a-day (OAD) or twice-a-day (TAD) in New Zealand for milk, fat and protein yield, lactation ...
once-a-dayestimated breeding valuesThe use of traits other than production (TOP) to aid selection for conformation fit-for-purpose offspring becomes more important as once-a-day (OAD) milking for whole or part season becomes more common. In 2013 Massey University Dairy 1 farm transitioned their...
Under a PT-scheme, estimated genetic progress ranged from 7 to 45 kg/year (milk), 2.18–2.24 kg/year (fat), and 0.83–1.71 kg/year (protein). Conversely, genetic gains resulting from selecting bulls generated in twice-a-day (TAD) milking systems and used to inseminate cows in OAD ...
In this case study, we compared the gross composition and fatty acid (FA) composition of milk from cows milked once a day (OAD) and twice a day (TAD) at different stages of lactation in real farm conditions with no control on feed. Seventy-two cows from a OAD milking herd and 181 ...