04/16/2026
Thursday Industry Insight: Cow Nutrient Requirements
Salvetti D’Ascoli – KRIRM Graduate Student
With spring calving just around the corner, it is essential to focus on the cowherd’s nutrition as they approach their greatest nutrient requirements. One of the first steps in developing a feeding plan is to know exactly what you are feeding. This could include knowing the differences in nutritional requirements for various stages and classes of cattle, or the nutrient content of the feedstuffs fed. The crucial factor is knowing exactly how much the cattle weigh to accurately feed and prevent wasting money by overfeeding. An article from Oklahoma State University Extension states that between 42-52% of cow-calf enterprise costs can be attributed to grazing and feeding/supplementation (Lalman, Holder, 2024). Recognizing that this is a large cost center, producers should design the most economically cost-effective and nutrient-dense nutrition strategy possible, especially during calving and lactation.
As spring calving approaches, it's important to consider how dry matter intake relative to body weight varies by stage of lactation—late gestation, early lactation, and late lactation—whether cattle are grazing or fed hay. For a diet consisting of low-quality forage, the expected values would be 1.5% of body weight (BW) during late gestation, 2.5% BW during early lactation, and 2.25% BW during late lactation. Growing heifers should gain 1.0-1.5 lbs. per day to achieve a higher percentage of mature bodyweight before their first calf. One effective strategy to support this growth is to increase protein supplementation to encourage dry matter intake of low-quality forages.
Protein requirements for running-age cows become important as they get into the final trimester, when two-thirds of fetal growth occurs. Increasing a cow's protein intake at this stage will help ensure she is in optimal condition as she approaches calving and lactation. It is essential to meet both energy and protein requirements during the last trimester to prevent any loss of body condition. Lactating cows will require nearly double the amount of protein as a dry cow, which is understandable given the milk she produces – averaging around 25 lbs./d – contains a significant amount of protein. Ensuring the nutritional needs are met during lactation is just as important as in the third trimester, as it helps maintain the cow’s body condition and supports successful rebreeding. Additionally, vitamin and mineral supplementation is a key component of nutrition to consider. Various informative charts, including those from the Beef Cattle NRC, detail the nutrient requirements for beef cattle.
In conclusion, prioritizing cow nutrition is essential, particularly during the final third of pregnancy and throughout lactation. This can be achieved through informed management decisions tailored to the cow’s specific environment.