RESUMEN
This study was performed with the main objective of evaluating the effect of the combination of pelleting and monensin on fatty acids (FA) composition, the concentration of total polyphenols and flavonoids, and the oxidative stability of milk in cows fed a concentrate containing soybean seeds. Eight Holstein multiparous cows were distributed in a replicated Latin square design. The four supplement treatments consisted of the combination of two factors (pelleting and monensin) and one concentrate as follows: (1) unpelleted concentrate with no monensin (CO); (2) pelleted concentrate with no monensin (PE); (3) unpelleted concentrate with 96 mg of monensin/kg of dry matter, DM (MO); and (4) pelleted concentrate with 96 mg of monensin/kg of DM (PM). There was no interaction between pelleting and monensin for milk production and concentration of milk protein, lactose, total polyphenols, flavonoids, conjugated dienes (CD), and reducing power. Fat and total solids concentration in milk were decreased when cows were fed pelleted (PE and PM) concentrates. Feeding cows with PE and PM concentrates increased the CD concentration in milk. Regarding milk FA concentration, there was no difference among treatments for total saturated, monounsaturated, and polyunsaturated FA. The most prominent result was that pelleting increased the milk concentration of omega-3 FA. Altogether, the present study suggests that the pelleting process can improve the milk fat quality by increasing the omega-3 FA, while the combination of pelleting and monensin in the diet of grazing dairy cows fed soybean-based concentrate adds no further improvements to FA profiles and oxidative stability of milk.
Asunto(s)
Alimentación Animal/análisis , Antioxidantes/química , Bovinos/fisiología , Ácidos Grasos/química , Glycine max , Monensina/farmacología , Animales , Antioxidantes/metabolismo , Dieta/veterinaria , Suplementos Dietéticos , Ácidos Grasos/metabolismo , Femenino , Manipulación de Alimentos , Lactancia , Lactosa/metabolismo , Leche/química , Proteínas de la Leche/análisis , Semillas/químicaRESUMEN
Objetivou-se com este trabalho avaliar a adequação de sistemas de produção leiteira da região de Maringá à Instrução Normativa-51 (IN-51/2002) e os impactos destas obre o preço de venda do leite, usando como parâmetros os níveis de contagem de células somáticas (CCS) e contagem bacteriana total (CBT). Foi realizado um levantamento da qualidade do leite e do preço pago ao produtor, com base nos valores médios do CONSELEITE, durante o período de janeiro de 2010 a março de 2011. As análises de CCS e CBT foram realizadas no Laboratório da APCBRH em Curitiba-PR, utilizando os equipamentos Somacount 500® e Bactoscan®, respectivamente. Em função das amostras de leite coletadas pode-se inferir que apenas 28% das propriedades avaliadas encontram-se enquadrados na IN-51/2002.
The objective of this study was to evaluate the adequacy of dairy production systems in the area of Northwest of Parana front of Normative instruction number 51 and their impact on the selling price of milk using the levels of SCC and TBC in milk. A survey on milk quality and the price paid to producers, based on average values of CONSELEITE, was carried out from January 2010 to March 2011. Analyses of milk SCC and TBC were conducted at the Laboratory of APCBRH in Curitiba-PR using the Somacount 500 ® and Bactoscan ® equipment, respectively. Only 28% of the properties were set within the normative instruction 51 using milk samples collected for the present survey.