Lysine is one of the main limiting amino acids for dairy cows, especially when the diet is based on corn or soybean meal (Polan et al., 1991; Armentano et al., 1997; NASEM, 2021).
It is estimated that there are 8.82 grams of lysine amino acid per 100 grams of milk protein (NASEM, 2021), so it is necessary to provide the required and balanced amount of lysine amino acid in the animal diet and using Lysotect protected lysine produced by Mehregan Mokammel Bartar Alborz Company is the best option to meet the needs of livestock.
t is known that lysine is the most vulnerable amino acid against heat among the essential amino acids of livestock (Schwab, 1995). Increasing the heat in the processing of cottonseed press cake
(Craig and Broderick, 1981), soybean meal (Parsons et al., 1992) and soy bean (Faldet et al., 1992) will cause a decrease in the amount of metabolizable lysine for ruminants.
Lysotect protected lysine is the most reliable product to meet the animal’s need for this essential amino acid in this situation.
Lysotect protected lysine with almost 45% of lysine amino acid can cause an increase in efficiency of protein and increase in production of your livestock.
Several experiments have been conducted in relation to protected lysine and its effect extent on the productive performance of livestock. In general, the addition of protected lysine leads to an increase in milk production and milk protein (Polan et al., 1991; Fehlberg et al., 2020; Melendez et al., 2023).
In the following, we will review a meta-analytical paper related to protected lysine entitled “Effects of consumption of protected lysine during the postpartum period on the performance and profile of amino acids in dairy cows”.
The main goal of this meta-analytical study is to investigate the effect of feeding protected lysine on the blood amino acid profile and to identify the optimal concentration of lysine in the metabolizable protein of the diet. 13 papers, which included a total of 594 dairy cows, were used in this study.
An average of 19.3±10 grams of metabolizable lysine was used in these studies.
The results showed that adding protected lysine and increasing the metabolizable lysine from 6.5% to 8.5% of metabolizable protein caused a linear increase in milk production, milk fat, milk protein, milk modified with fat and milk modified with energy. Increasing the metabolizable lysine from 6.5 to 8.5% linearly increased the blood lysine amino acid concentration by 16.6 μmol.
You can see the effect of adding protected lysine to the diet in the opposite figure. The cows that started receiving protected lysine in early lactation (DIM ≤ 90) produced more milk per day (1.5 kg per day) compared to the control group.
However, when the cows started to receive protected lysine in the middle of lactation (DIM ≥ 90), we witnessed a lower production increase (820 g/day).
Regardless of the stage of lactation, the cows that received protected lysine experienced higher milk production (1.01 kg/day) compared to the control group.
The amount of milk production, milk fat, milk protein, FCM/DMI ratio and ECM/DMI ratio increased when metabolizable lysine increased from 6.5% of metabolizable protein to 8.5%, without changing the amount of dry substance consumed.
Based on the use of amino acids by the mammary gland, lysine is classified in the second group along with leucine, isoleucine, and valine. The absorption of the second group of amino acids by the mammary gland is much higher than its secretion as protein in milk (Mepham, 1982; NASEM, 2021).
In the studies of Suk et al. in 2017, it was found that the composition of microbial amino acids is very variable and largely depends on the feed consumed and the rumen microbiome. Therefore, microbial protein may not be able to provide all the animal’s need for essential amino acids. With the passage of time, extensive research has been conducted on determining the requirements of livestock for essential amino acids in order to achieve accurate feed formulation. The present study showed that the addition of protected lysine during the postpartum period led to an increase in milk production, in fact, an increase in metabolizable lysine from 6.5 to 8.5% of the total metabolizable protein of the feed led to an increase in milk production, milk fat, ECM, and FCM and showed a tendency to increase the milk protein production and weight gain.
At the beginning of lactation, the amount of the dry substance consumed decreases and the increase in acidosis emergence may affect the microbial protein or the supply of essential amino acids to the beginning of the intestine. In this situation, the most logical way to compensate for the need for lysine is to use Mehregan Mokammel Alborz’s lysotect protected lysine. The amount of lysotech protected lysine consumption in the diet varies according to the feed consumed, but in general, your livestock needs 10 to 60 grams of lysotect per day.
