Óleo de girassol na dieta de vacas Jersey em lactação: efeitos sobre o consumo, produção e composição do leite, balanço energético, perfil de ácidos graxos do leite e perfil metabólico

Abstract

The effect of increasing levels of sunflower oil on intake, milk yield and composition, energy balance, fatty acid profile and metabolic profile of lactating Jersey cows was evaluated. Were used eight multiparous cows, weighting of 443 kg ± 63 kg and average milk yield of 21 kg ± 2.15 kg. The experimental design was a double 4x4 Latin square with four periods of 15 days. The experimental diets were: T0 = control diet with 3.7 % ether extract ( EE ) in total dry matter (TDM), with the other diets T1, T2, T3, with increasing levels of ether extract, 6.0, 8.4 and 10.7 % in DM. Were used a mixture of chopped alfalfa hay and corn silage in a 50:50 ratio on a dry basis. The statistical analysis was variance and regression to 2nd order in the variables. The increasing inclusion of sunflower oil improved feed efficiency, increased production of milk fat, modified the profile of milk fatty acids, no differences in milk production and metabolic profile of animals were found. It is possible add increasing levels of sunflower oil to lactating Jersey cows until 10.7 % EE without affect the health of animals, obtaining higher energy intake through diet, with improvement of feed efficiency in milk production and fat acids profile.