RESUMO -Foram avaliados dois níveis de suplementação com sal mineral proteinado (290 e 400 g.an -1 .dia -1 ), em comparação ao sal mineral, em 90 novilhos Nelore, mantidos em pastagem de grama estrela roxa (Cynodon plectostachyus Pilger) no inverno. O consumo do suplemento foi ajustado pelo teor de cloreto de sódio adicionado à mistura. Quando considerado o período de adaptação (28 dias) na análise estatística, não foi observada diferença no ganho médio diário (GMD) entre os tratamentos, ao passo que, quando desconsiderado, a suplementação com 400 g.an. -1 .dia -1 resultou em maior GMD (0,15 kg.dia -1 ), em comparação aos demais tratamentos (0,06 e 0,05 kg.dia -1 para o sal proteinado, com consumo de 290 g.an. -1 .dia -1 , e sal mineral, respectivamente). A qualidade e disponibilidade da forragem foram semelhantes entre os tratamentos, com médias de 4366 kg de matéria seca.ha -1 , 2145 kg de matéria verde seca.ha -1 e 353 kg de folhas.ha -1 . Houve redução na proporção de folhas e colmos e aumento na proporção de material morto, em função dos períodos experimentais. Os valores médios para composição química da pastagem foram de 3,5% de PB, 1,6% de PB digestível, 48,1% de FDA e 48,4% de DIVMS. A pastagem de grama estrela roxa apresentou baixo valor n utritivo entre os meses de maio e outubro, sendo necessária a suplementação protéica para que os animais pudessem manter ou ganhar peso neste período.Palavras-chave: bovinos de corte, cynodon, grama estrela, inverno, proteína bruta, uréia Levels of Protein and Mineral Salt Supplements for Nelore Steers Finished in PastureDuring the Low Grass Production Season ABSTRACT -Two levels of protein and mineral supplements (290 and 400 g.an. -1 .day -1 ) were evaluated and compared with the mineral supplement in 90 Nelore steers on star grass pasture (Cynodon plectostachyus Pilger) during the winter. The supplement intake was ajusted by the concentration of sodium clore into the mixture. Considering the first 28 days (adaptation period) in the statistical analysis, there was no difference in average daily gain (ADG). Taking out this period of adaptation, the ADG was better for the protein and mineral supplement with intake of 400 g.an. -1 .day -1 (0.15 kg per animal a day), when compared with the other supplements (0.06 and 0.05 kg per animal a day, respectively for intake of 290 g.an. -1 .day -1 of protein mineral supplements and mineral salt). The forage quality and availability were similar for the different treatments, with average levels of 4366 kg dry matter.ha -1 , 2145 kg green dry matter.ha -1 , and 353 kg of leaves.ha -1 . The proportion of leaves and stems were reduced and the dead material proportion rose during the experimental periods. The chemical composition of forage had values of 3.5% of CP, 1.6% of digestible CP, 48.1% of ADF, and 48.4% of IVDMD. The sta grass pasture presented poor nutritional quality during beetwen the months of may and october, so the protein supplement is necessary to the animals mantain or gain weight during this period. IntroduçãoA p...
The objective of the present work was to evaluate the physical-chemical characteristics (density, pH, acidity, fat, protein, lactose and total of solids contents) and milk fatty acids composition (C: 4 to C: 20) C10:0, C12:0, C14:0, C16:0, C16:1ω7, C18:0 and C18:3ω6.
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