suplementação energética para vacas leiteiras pastejando azevém com alta oferta de forragem energy supplementation to dairy cows grazing italian ryegrass with high-herbage allowance
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2007
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Abstract
Foi avaliado o efeito da quantidade de um suplemento energético (grão de milho) sobre o consumo de forragem e a produção de leite em vacas leiteiras pastejando azevém (Lolium multiflorum). Os tratamentos foram 2 e 4 kg de grão de milho moído/vaca.dia. Oito vacas holandesas no terço médio de lactação foram divididas em dois grupos em um delineamento de dupla reversão. A oferta de MS foi 35 kg/vaca.dia no método rotativo. O consumo individual de forragem foi estimado por meio da produção fecal e da digestibilidade da forragem selecionada. As características da forragem oferecida e da pastagem após a saída dos animais não variaram entre piquetes. A digestibilidade da MO da forragem ingerida foi 76,1 ± 2,77%. O consumo de MO de forragem (13,5 ± 1,89 kg/dia), a produção de leite (22,5 ± 0,92 kg) e os teores de gordura (32,4 ± 2,55 g/kg) e proteína do leite (28,5 ± 0,82 g/kg) não foram influenciados pelo nível de suplementação. Vacas leiteiras com potencial de produção de até 22,5 kg/dia, após o pico de produção, pastejando azevém anual manejado com alta oferta de forragem não respondem à suplementação com mais de 2,0 kg de grão de milho moído.
The effect of a energy supplement (corn grain) on the herbage intake and milk yield of lactating dairy cows grazing italian ryegrass (Lolium multiflorum) was evaluated. The treatments were 2 and 4 kg of ground corn/cow.day. Eight Holstein cows in the second third of their lactation were divided in two groups in switch back procedure. The expected herbage allowance was 35 kg/cow.day in rotational grazing system. Individual herbage intake was estimated from output fecal and the digestibility of the selected herbage. The characteristics of the pre-grazing herbage and post-grazing characteristics did not change between paddocks. The herbage OM digestibility was 76.1 ± 2.77 %. The herbage OM intake (13.5 ± 1.89 kg/day), daily milk yield (22.5 ± 0.92 kg/day), milk fat content (32.4 ± 2.55 g/kg) and milk protein content (28.5 ± 0.82 g/kg) did not differ with the supplementation levels. Dairy cows with a milk production potential of 22.5 kg/day, after milk production peak, grazing annual italian ryegrass pasture with high forage offer, did not respond to more than 2 kg of ground corn grain.
The effect of a energy supplement (corn grain) on the herbage intake and milk yield of lactating dairy cows grazing italian ryegrass (Lolium multiflorum) was evaluated. The treatments were 2 and 4 kg of ground corn/cow.day. Eight Holstein cows in the second third of their lactation were divided in two groups in switch back procedure. The expected herbage allowance was 35 kg/cow.day in rotational grazing system. Individual herbage intake was estimated from output fecal and the digestibility of the selected herbage. The characteristics of the pre-grazing herbage and post-grazing characteristics did not change between paddocks. The herbage OM digestibility was 76.1 ± 2.77 %. The herbage OM intake (13.5 ± 1.89 kg/day), daily milk yield (22.5 ± 0.92 kg/day), milk fat content (32.4 ± 2.55 g/kg) and milk protein content (28.5 ± 0.82 g/kg) did not differ with the supplementation levels. Dairy cows with a milk production potential of 22.5 kg/day, after milk production peak, grazing annual italian ryegrass pasture with high forage offer, did not respond to more than 2 kg of ground corn grain.
| Reference Key |
filho2007revistasuplementao
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| Authors | ;Henrique Mendonça Nunes Ribeiro Filho;Cláudio Eduard Neves Semmelmann;Maicon Saulo Heydt;André Thaler Neto |
| Journal | european journal of lipid science and technology |
| Year | 2007 |
| DOI |
10.1590/S1516-35982007000900027
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