This article has been peer reviewed and accepted for publication. It is in production and has not been edited, so may differ from the final published form.
The effectiveness of using energy preparations in feed rations for cows in the periparturient period
An experiment aimed at a comparison of the effect of a mix of two energy preparations (glucogenic one - G and containing free fatty acids - F), administered in the diet during the transition period over different periods of time (5 or 8 weeks), on the animal condition, feed intake, yield and composition of milk, and blood and urine parameters. The experimental additive was a mix (1:1) of two energy preparations: a loose mixture of propylene glycol and sodium propionate and a free fatty acid preparation in the form of rumen-undegradable pellets. The study included 50 Polish Black-and-White Holstein-Friesian dairy cows allocated into 5 treatment groups, control (C) and four experimental ones (G1F1, G2F2, G2F1 and G1F2). The preparations were mixed at a 1:1 weight ratio (500 g per head, comprising 250G and 250F) and were administered to the all experimental groups of cows daily as a component of the experimental concentrate for 5 weeks (from the 2nd week before the expected calving and until the 3rd week of lactation). From the 4th until 6th week of lactation, the supplementation in the experimental groups has changed and animals received either no additive (G1F1), or continuously were supplemented with the G-F mix (G2F2), or received only G (G2F1) or only F preparations (G1F2). The preparations used in the study had a long-term influence on the increase in the milk yield of cows, on the improvement of their health condition, and on the reduction of weight loss. The study results confirm that prolongation of the supplementation until the 6th week of lactation may cause favorable changes in animal performance and milk quality. Due to different modes of action, the simultaneous supplementation of glucogenic and free fatty acid preparations reduced the negative energy balance in the cow’s organism and improved milk production and composition. The best results were obtained after administration of the mixture (1:1) of the glucogenic preparation and free fatty acids at the dose of 500g/d/animal over the 8-week periparturient period.
AN16550 Accepted 14 September 2017
© CSIRO 2017