Reducing milking frequency in early lactation improved the energy status but reduced milk yield during the whole lactation of primiparous Holstein cows consuming a total mixed ration and pasture |
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Authors: | A Capelesso G Kozloski A Mendoza M Pla JL Repetto C Cajarville |
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Affiliation: | 1. Departamento de Nutrición Animal, Universidad de la República, Facultad de Veterinaria, Ruta 1 km 42.5, San José, Uruguay;2. Departamento de Zootecnia da Universidade Federal de Santa Maria, Rio Grande do Sul, 97105900, Brazil;3. Programa de Producción de Leche, Instituto Nacional de Investigación Agropecuaria, Ruta 50 km 11, 70002, Colonia, Uruguay;4. Departamento de Producción de Bovinos, Universidad de la República, Facultad de Veterinaria, Ruta 1 km 42.5, San José, Uruguay |
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Abstract: | To investigate the immediate and long-term performance effects of milking frequency during early lactation of primiparous dairy cows consuming a total mixed ration and pasture, 20 Holstein cows were assigned in a randomized block design to either once-daily (1×) or twice-daily (2×) milking during the first 8 wk of lactation (treatment period). After the treatment period, all cows were milked 2× until wk 43 of lactation. Cows were fed a total mixed ration (approximately 15 kg of DM/cow per day) and allowed to graze an oat pasture (Avena sativa). Dry matter intake was 19.1 kg of DM/cow per day on average and was not affected by treatments. Milk yield was 40% lower in cows milked 1× during the treatment period, and a carryover effect existed until wk 21 of lactation, resulting in a final reduction of 15% of milk yield in the whole lactation. Milk lactose concentration decreased, whereas fat and protein concentrations increased for cows milked 1×. Mobilization of energy reserves during the treatment period occurred in both groups, but cows milked 1× showed greater body condition score and greater backfat thickness. In conclusion, milking 1× during the first 8 wk of lactation resulted in immediate and carryover negative effects on milk and milk solid yield without affecting feed intake, resulting in the improved energy status of primiparous dairy cows. |
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Keywords: | Corresponding author dairy cows grazing once-daily milking |
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