Dante Carrillo
Vitamins play a key role in the overall nutrition of ruminants, but the amounts needed are small and are often overlooked. Ruminants require a variety of vitamins, including vitamin A, B, C, D, and E. Vitamin A, for example, is necessary for vision, bone growth, immunity, and maintenance of epithelial tissue. Vitamin D may need to be supplemented in diets for indoor ruminants, and vitamin E is important for various functions in the body. Ruminants can synthesize some vitamins, such as B vitamins and vitamin C, but supplementation is sometimes necessary to ensure adequate levels. Factors such as stress, disease, and environmental conditions can increase the need for vitamins, and certain feed handling practices can alter vitamin content. Ultimately, a balanced diet that meets the specific needs of the ruminant is crucial for maintaining health and productivity.
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What You'll Learn
Vitamin A deficiency
Vitamin A, or retinol, is a fat-soluble vitamin that is essential for the proper nutrition of ruminants. It is necessary for several functions, including vision, bone growth, immunity, and the maintenance of epithelial tissue. Vitamin A is required for chemical reactions in the retina that are necessary for sight. A deficiency in vitamin A can lead to night blindness and the formation of ulcers on the cornea. It can also result in unchecked bone growth, leading to malformed bones and joints.
Vitamin A plays a crucial role in immunity by aiding in the production of antibodies and maintaining healthy epithelial cells, which act as a barrier to infection. A deficiency reduces the primary antibody response to infections. Additionally, vitamin A deficiency can lead to keratinization, a thickening and hardening of tissues, resulting in a loss of tissue function and increased susceptibility to infections. Keratinization of the digestive and respiratory tracts can cause diarrhea and pneumonia.
Ruminants are particularly susceptible to vitamin A deficiencies when their diets contain a high proportion of grain and insufficient access to green growing forages. This is often seen in situations of inadequate pasture area, overgrazing, drought, and winter feed shortages. The need for vitamin A supplementation is highest during periods of stress, such as calving, lambing, breeding, and other challenging conditions.
Young ruminants have a lower storage capacity for vitamin A compared to healthy adult livestock, which can store enough vitamin A to last for up to six months. Borderline vitamin A deficiency is more common than severe deficiency, and it can lead to decreased reproductive efficiency in both male and female ruminants. Supplementation with vitamin A during the dry period can benefit calf health and improve overall reproductive performance.
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Vitamin B1 (thiamine)
Vitamin B1, also known as thiamine, is a vitamin that is normally produced by bacteria in the rumen of ruminants such as cattle and sheep. Ruminants have a daily requirement of thiamine, and the bacteria typically produce enough to meet this. However, thiamine deficiencies can develop under certain conditions, such as ruminal fermentative disorders, the intake of certain plants and foods, and the overproduction of thiaminase enzymes.
Thiamine deficiency can lead to serious health issues in ruminants, such as Cerebrocortical Necrosis (CCN) and polioencephalomalacia (PEM). CCN affects the coordination and movement of the animal, eventually leading to a coma and death. PEM is a type of brain degeneration that causes neurological issues and can result in death or permanent brain damage. Outbreaks of PEM are more common in feedlots, where diets are high in carbohydrates and low in fibre, and the death rate is often higher than in grazing livestock.
The risk factors for thiamine deficiency include a diet high in carbohydrates, the consumption of plants containing thiaminase (such as Bracken fern, horsetails, and Nardoo), and diets high in sulphates, such as brassica crops. Additionally, ruminal acidosis, a fermentative disorder, can also lead to thiamine deficiency. Acute ruminal acidosis occurs when there is excessive consumption of readily fermentable carbohydrates over a short period, resulting in rapid fermentation and the production of large amounts of lactic acid. This leads to a dramatic reduction in ruminal pH, metabolic lactic acidosis, and overt clinical signs.
To prevent and treat thiamine deficiency, vitamin B1 injections or oral supplements can be administered. Providing a high-quality hay diet and adding thiamine supplements to the feed for 2-3 weeks can help return thiamine availability to normal. In the case of PEM, it is recommended to switch to a diet higher in roughage and slowly reintroduce grain to achieve the required weight gains.
Vitamin B1 supplementation has been shown to have benefits beyond just treating deficiencies. In dairy cattle, thiamine supplementation tended to increase milk and component production when dietary concentrations of neutral and acid detergent fibre were lower than recommended.
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Vitamin D supplementation
Vitamin D is one of the fat-soluble vitamins, along with vitamins A, E, and K. It is essential for the optimum performance of ruminants, especially lactating dairy cows, who require 13.6 IU/lb of body weight, and beef cattle, who require 2.6 IU/lb of body weight.
Vitamin D is typically synthesized by ruminants through exposure to sunlight. However, in indoor confinement-based systems, supplementation may be necessary to ensure adequate levels. This is particularly important for dairy cows, as vitamin D plays a crucial role in calcium absorption and bone health.
Supplementation with vitamin D can also benefit the overall health of the ruminant. For example, it can help maintain the health of the mucous membranes and epithelial linings, preventing tissue thickening and hardening (keratinization) and reducing the risk of infection.
Additionally, vitamin D supplementation can support reproductive health. A deficiency in vitamin D can lead to reproductive issues such as poor sperm production in males and early abortion in females.
It is important to note that excessive vitamin D supplementation should be avoided, as it can lead to toxicity. Therefore, the amount of supplemental vitamin D should be carefully calculated based on the specific needs of the ruminant, taking into account factors such as age, health status, and physiological state.
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Vitamin E and selenium
Vitamin E deficiencies can occur in ruminants, although they are sometimes difficult to ascertain due to vitamin E's relationship with selenium. Deficiency in either vitamin E or selenium can result in tissue degeneration, such as white muscle disease. Vitamin E does not cross the placenta in significant amounts, but it is concentrated in colostrum. Thus, providing colostrum rich in vitamin E is essential, as both calves and lambs are born with low levels of the vitamin.
Selenium is needed in the body for its antioxidant properties, maintaining the immune system, scavenging free radicals, and energy metabolism. Selenium is present in the Glutathione Peroxidase enzyme, which is key to transferring energy around the body. Selenium and vitamin E have closely related functions, and their dietary requirements are influenced by many nutrient interrelationships, including interactions with sulfur, lipids, proteins, amino acids, and several microelements.
Supplementation of selenium and vitamin E has been shown to reduce the negative effects of heat stress in sheep by reducing systemic and respiratory oxidative stress. This can help sustain redox homeostasis and improve the health and productivity of ruminants.
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Iron and manganese
Manganese (Mn) is an essential trace element that plays a crucial role in the growth, development, and metabolism of ruminants. It is particularly important for the synthesis of chondroitin sulfate, as it activates the enzymes polysaccharide polymerase and galactose transferase. Mn also improves cellulose digestibility and dry matter digestibility (DMD). Rumen efficiency, which is influenced by Mn levels, directly affects fermentation end products, impacting the productivity of ruminants.
Mn is typically supplemented in inorganic forms such as Mn oxide, Mn chloride (MnCl2), and Mn sulfate (MnSO4), which has historically been the most common Mn supplement in animal nutrition. However, in recent years, organic forms of Mn, such as Mn-methionine (Mn-Met), Mn-proteinate, and Mn-polysaccharide, have gained popularity in livestock diets. These organic forms are complexed or chelated to an organic molecule, reducing the likelihood of interactions with other dietary factors and potentially enhancing absorption.
It is important to note that high levels of dietary calcium and phosphorus can reduce Mn absorption due to lowered solubility. Therefore, in areas with higher soil pH and lower Mn content in forages, Mn deficiencies in ruminants may be more prevalent. Additionally, excessive iron can compete with Mn for binding sites in the digestive tract, leading to lower Mn absorption and potential Mn deficiency.
In summary, iron and manganese are crucial minerals in ruminant diets, impacting nutrient digestibility, fermentation, and overall health. While iron supplements have shown positive effects on growth and meat quality, Mn plays a vital role in growth, development, metabolism, and bone health in ruminants.
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Frequently asked questions
All animals require vitamin A for proper nutrition, and it is the vitamin that adult ruminants are most likely to be deficient in. Vitamin A is necessary for vision, bone growth, immunity, and the maintenance of epithelial tissue. Ruminants also need vitamin E, which impacts many functions throughout the body.
Other vitamins that may be needed in supplemental form include vitamin B1, B6, and B8 (also known as biotin).
Deficiency often results in keratinization, a form of thickening and hardening of tissues, thus causing a loss of tissue function and increased susceptibility to infection. Keratinization of the digestive and respiratory tracts results in diarrhea and pneumonia. Keratinization of the reproductive tract results in poor sperm production in males and early abortion in females.
Affected animals develop Cerebrocortical Necrosis (CCN). They are unable to coordinate movement and, after a few days, become comatose and eventually die.
