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Contradictory results has been found on the effects of soybean supplementation and conjugated linoleic acid (CLA)content in milk on feeding systems based on fresh forage The objective of the study was to evaluate the effect of adietary supplement with different quantities of extruded whole soybean on the production and composition of milk,and CLA concentration or their isomers in Jersey cows under pasture conditions. Twenty-one Jersey cows were randomlyassigned into 3 groups of 7 animals each. The cows were supplemented with a dietary concentrate (5 kg d–1),and each group received one of the three next treatments: control without soybean (0-SB), with extruded whole soybeanat 0.5 kg d–1 (0.5-SB) or at 1 kg d–1 (1-SB). The basic diet was a pasture composed of Lolium perenne (70%), Trifoliumrepens (25%) and other species. The duration of the study was 75 d. Milk production (p = 0.706) and protein production(p = 0.926) were not affected by treatments. Fat (p = 0.015) and protein (p = 0.045) content as well as fatproduction (p = 0.010) were lower in the 1-SB group. There was no effect of the inclusion of extruded soybean ontotal CLA content (p = 0.290) or the content of cis-9, trans-11 (p = 0.582), trans-10, cis-12 (p = 0.136) and cis-10,cis-12 (p = 0.288) isomers. However, concentrations of all isomers were affected by the nutritional quality of the pasture,with low values observed at greater maturity stages of pastureleche es contradictorio. El objetivo de este estudio fue evaluar en vacas Jersey en pastoreo, el efecto de la suplementaciónde un concentrado con diferentes cantidades de soja entera extrusionada sobre la producción de leche y su composición,especialmente sobre el contenido en CLA y sus isómeros. 21 vacas Jersey fueron divididas al azar en 3 grupos de7 animales cada uno. Los animales fueron suplementados con un concentrado (5 kg d–1) y a cada grupo se le asignó unode los tres siguientes tratamientos: control sin soja (0-SB), con 0.5 kg d–1 de soja (0.5-SB) y con 1 kg d–1 de soja (1-SB).La base de la alimentación fue el pasto, compuesto mayoritariamente por Lolium perenne (70%) y Trifolium repens (25%).La duración del estudio fue de 75 días. La producción de leche (p = 0.706) y la producción de proteína (p = 0.926) no sevieron afectados. Los porcentajes de grasa (p = 0.015) y proteína (p = 0.045) y la producción de grasa (p = 0.010) fueronmás bajos en el grupo 1-SB. Las cantidades de soja no modificaron los contenidos de CLA total (p = 0.290) y de losisómeros cis-9, trans-11 (p = 0.582), trans-10, cis-12 (p = 0.136) y cis-10, cis-12 (p = 0.288), pero si fueron afectadospor la calidad nutritiva del pasto, observándose menores valores al aumentar la madurez del pasto

Effect of extruded whole soybean dietary concentrate on conjugated linoleic acid concentration in milk in Jersey cows under pasture conditions