Final answer:
Beef cows in the first trimester of pregnancy require a well-balanced diet but do not need significantly more nutrients than for maintenance. The focus should be on ensuring the diet is balanced with sufficient energy, protein, vitamins, and minerals.
Step-by-step explanation:
For beef cows during the first trimester of pregnancy, the daily nutrient requirements are generally not significantly higher than their regular maintenance needs. During this stage, the focus should be on ensuring the diet provided is well-balanced and includes all the necessary nutrients to support both the cow's bodily functions and the early development of the fetus. The diet should include adequate energy, protein, vitamins, and minerals, particularly maintaining sufficient levels of calcium and phosphorus for bone development.
As the pregnancy progresses into the second and third trimesters, the nutrient requirements for beef cows will increase to support the rapid growth of the fetus. At this point, the cows will require additional calories and higher nutrient intake. However, it's important to note that overfeeding in the first trimester can lead to excessive weight gain and potential calving problems. Regular consultation with a livestock nutritionist is recommended to tailor the feed to the cows' changing needs throughout the pregnancy.