Replacing Glycerol with Barley, a Right Choice?
Is Glycerol Glycerol an Ideal Substitute for Milk Dairy Rice?
Can this side product affect milk production and milk quality?
The following report is about the research carried out on the subject in Denmark.
Glycerol is a byproduct that comes from the biodiesel industry and is sometimes used in ruminants. Glycerol converts to glucose by the liver and kidney of the livestock and provides the energy required for cellular metabolism.
Interest in the use of glycerol has been increased as a nutrient in feed because of its availability. This lateral product also reduces the cost of animal feed. Hence, it is suitable as a food source for livestock.
Different levels of glycerol were tested.
The purpose of this study is to determine the amount of glycerol that can be used as a food source of nutrients, to be used in the diet and to be used in the dairy cow, mid or late lactation, without affecting the production of milk, milk compounds, fatty acids free milk and milk sensory qualities.
This experiment was conducted on 40 Holstein cows in a livestock unit whose automatic milking unit was located at the Aarhus University of Denmark Cow Research Center. In the combined mixture of ration (PMR) of these dairy cows, raw glycerol replaced the barley and at levels: (Gly0), 0%, (Gly6) 6%, (12 (Gly12%, and Gly18) 18% dry matter diet (DM). When more glycerol was added to the diet, cows consumed less concentrate in the milking salon, and with the increase in the amount of glycerol in the livestock diet, the protein and lactose yield of the produced milk decreased. The researchers noted that with increasing the glycerol ratio in the diet by examining milk fatty acids found palmitic acid, oleic acid, linoleic acid, linoleic acid and amino acid linoleic acid Of milk decreased linearly, while the majority of short and medium chain FFA ratio of milk increased.
By conducting this experiment, researchers conclude that glycerol, as a source of energy in livestock feed, can replace oats and make up 18 percent of the dry matter diet for dairy cows in the middle or after lactation without this. Which has an impact on the quality of milk.
As expected, the milk FFA specification has slightly changed in the diet using glycerol. The effects of glycerol included in animal feed on the taste of fresh and stored milk can be considered marginally. (No appreciable effect). However, adding more than 12% of glycerol in the diet may reduce the true energy of the milk (ECM)