Desempenho de vacas leiteiras em pastejo de alfafa

• Autor(a) principal: Kuwahara, Frank Akiyoshi [UNESP]
• Data de Publicação: 2015
• Tipo de documento: Tese
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/127960; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/09-09-2015/000847133.pdf
• topic: Bovino de leite - Alimentação e rações; Milho - Silagem; Pastagens; Leite - Produção; Dairy products

The intensive of milk yield systems, the high cost of the crop yield, saddled the economic sustainability of dairy activity. The quantities and percentages of concentrated ingredients, it's high to meet desired yield level. Thus, the alfalfa by high nutritional value allows the used as a substitute for part of the concentrated feed, with a reduction in the cost of milk yield and maintain the quality of the diet. In this way, the objective of this study was to evaluate the performance of 36 cows Holstein X Jersey crossbreed, average lactation stage, with the partial replacement of silage corn for alfalfa pasture. In a randomized block design, in 90 days of experimental time, composed of four treatments: control; one; two; and four hours of daily grazing in alfalfa. The grazing management was rotated, and the amount of alfalfa corresponding to 3.0; 5.0 and 7.0 kg of dry matter (kg of DM.animal-1.day-1), for 1, 2 and 4 hours of grazing, respectively. The parameters evaluated were: milk yield, live body weight, dry matter intake, milk quality, animal behavior and economic viability. The average milk yield did not differ between treatments (P>0.05), whose averages were 29.17; 28.60; 27.87 and 28.34 liters.animal-1.day-1 in the control group, 1, 2 and 4 hours of grazing, respectively. It were not reported significant differences (P>0.05), for animal behavior and milk quality, with the exception of treatment of control group, who presented level of N-ureic in milk above the treatmento 1, 2 and 4 hours (P<0.05) and 19 mg/dL, the treatments 2 and 4 hours showed about 0.76% and 4.42% more profitable when compared to the control group. The partial replacement of silage corn for alfalfa grazing not limited the productive animals performance and proved to be economically advantageous in relation to confinement.