Effects of supplementation of Brachiaria brizantha cv. Piatá and Napier grass with Desmodium distortum on feed intake,digesta kinetics and milk production in crossbred dairy cows

摘要

This study was planned to analyse the basis that make Brachiaria species with greater feeding value than Napier grass(Pennisetum purpureum) for lactating dairy cows.Forty lactating crossbred cows were stallfed on Brachiaria brizantha cv.Piata or Napier grass cv.French Cameroon supplemented(mixed on fresh matter basis) or unsupplemented with Desmodium distortum, a forage legume.All cows were fed on fresh matter basis under small-holder farming conditions.Results showed that B.brizantha cv.Piata had higher contents of dry matter(DM), crude protein(CP) and organic matter(OM), but lower contents of neutral detergent fibre(NDF) and acid detergent fibre(ADF) than Napier grass(P < 0.001).The legume supplementation increased intakes of CP and metabolizable energy(ME; P < 0.001), with higher effect on cows fed B.brizantha cv.Piata than on cows fed Napier grass.Average daily milk yield was lower on diets based on Napier grass than those based on B.brizantha cv.Piata(P < 0.001).The retention time of the particle phase of digesta in the digestive tract was longer on Napier grass(83.1 h) than on B.brizantha cv.Piata(62.8 h)(P < 0.05).It was concluded that in dairy cows, legume supplementation of B.brizantha cv.Piata increases nutrient intake, hence resulting in higher milk yields than supplementation of Napier grass.