Effects of abomasal infusion of cottonseed oil or glucose on milk production and compositions in lactating Sannen dairy goats

Four ahomasal cathetered multiparous lactating Sannen goats with mean milk production of 1.6 ± 0.64 kg and 139 ± 4 days in milk were allocated to 4 treatments in a latin square design. The goats were fed a basal diet containing 40% alfalfa hay and 60% concentrate. The basal diet was supplemented by infusion of 1) water, 2) cottonseed oil (48 g/d), 3) glucose (100 g/d) and 4) mixture of cottonseed oil and glucose (24 and 50/d) as experimental treatments. The experiment had 2 periods including adaptation (14 days) and Collection (7days) periods. Infusion of cottonseed oil or glucose had no significant effect on intake or digestibilies of DM, OM, CP, NDF and ADF, of the basal diet. There were no significant differences between total protein, casein, NPN and whey content of milk samples. Infusion of cottonseed oil or mixture of glucose and cottonseed oil increased milk fat percentage. It was concluded that supplying more energy as oil or glucose in abomasums in mid lactation had no effect on productive performance of dairy goats, although infusion of cottonseed oil increased milk fat percentage. Plasml cholestral and triglyceride levels increased by infusion of cottonseed oil, but plasma glucose and BUN remained constant.