Qualidade do leite de vacas sob pastejo, suplementadas com concentrados contendo grãos de girassol processados física ou quimicamente.

• Ano de defesa: 2010
• Autor(a) principal: Santos, Wallacy Barbacena Rosa dos
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• dARK ID: ark:/35916/0013000003513
• Idioma: por
• Instituição de defesa: Universidade Estadual de Maringá; Brasil; Programa de Pós-Graduação em Zootecnia; UEM; Maringá; Departamento de Zootecnia
• Palavras-chave em Português: Gado leiteiro; Nutrição aplicada; Grãos de girassol; Produção e qualidade; Alimento funcional; Bovinocultura leiteira; Ácidos graxos; Oleaginosas; Peletização; Processamento de grãos; Proteção ruminal; Brasil.; Fatty Acids; Grain processing; Oleaginous; Pellet; Ruminal Protection; Brazil.; Ciências Agrárias; Zootecnia
• Link de acesso: http://repositorio.uem.br:8080/jspui/handle/1/1613

This study aimed to evaluate intake, the total digestible energy, the net energy of lactation, the non structural carbohydrates, digestibility, ruminal parameters and production, composition and milk fatty acid profile from Holstein cows kept at pasture, fed diets with ground sunflower seeds (GS), ground sunflower seed lignosulfonate-treated (GSL), ground and pellet sunflower seeds (GP) and ground and pellet sunflower seed lignosulfonate-treated (GPL). It was used eight multiparous Holstein cows, being four cows rumen fistulated, with 100 ± 62.6 DIM, 556 ± 39.8 kg of BW and 15.06 ± 0.12 kg of milk/day The cows were assigned in a double Latin square design with four periods of 21 days, 14 days of adaptation to diets and 7 days for data collection. The DM, OM, ash, CP, NDF and ADF intake (% of BW) did not differ for diets, however the pellet diets presented a higher intake of EE (0.19 vs 0.17 % of BW). The total apparent digestibility of DM, OM, CP, EE, NDF, ADF and NEC were similar (P<0.05) for diets. For ruminal parameters, the pellet diets provide a decrease on values of acetate (58.81 vs 52.8 mM) and an increase in pH values (6.66 vs 6.44). On the other hand, the lignosulfonate addition increased the acetate/propionate ration (3.64 vs 3.16 mM); the others ruminal parameters did not differ (P<0.05) among diets. Milk production did not differ (P<0.05) among diets with mean value of 15.06 kg/d. The chemical composition of milk were similar for diets, however the pellet diets presented a tendency (P=0.09) to reduce milk fat (3.47 versus 3.07%). The somatic cell score in milk did not present difference (P<0.05) for the analyzed diets. Pellet diets altered the milk fatty acid profile with an increase of 16:1n-11, 18:1trans and CLA18:2 c9 t11, but with a decrease of 18:0 and 20:0. Total saturated fatty acids were decreased, while mono and polyunsaturated fatty acids and total CLA increased for pellet diets. Thus, feeding pellet sunflower seeds diets is possible to obtain a better quality of milk with higher concentrations of unsaturated fatty acids and CLA, which are beneficial for human health.