The importance of the immune status of the calves whole entering to the feedlot
The entrance of the calves to the feedlot is a very important stage in the bait process, which will influence the final results.
Colostrum antibodies provide passive immunity to the animal, which protects its first days of life. Calves should develop active immunity as soon as possible after birth, which will protect the organism from external agents.
The establishment of immunity in the calves against the main pathogens, respiratory and intestinal, is a priority to achieve the success of a farm, with good health results and profitability of the feedlot.
The entrance to the feedlot is the most critical stage in the bait process. It is a stage in which animals can have sudden changes: transport, change of location and social environment, generally towards intensification, in the case of pastoral calves separation from its mother, and change of diet, generating stress situations that cause immunosuppression, a decrease in the immune response due to the reduction of the production of cytokines in stress situations (molecules responsible for signaling the defending cells of our body and the immune system).
To all this factors should be added, that in many feedlots we find entries of animals that have different origins, while entering of animals starts an intense stage in the health program, in which the immune system must seroconvert vaccines and face antiphrastic treatments. It is advisable to fight against parasites in mothers. In the case of pastoral calves, work with rotations of grasses and in the case of lactating calves; try to be changed to the milk replacer.
The digestive system is to be developed and keratinized, for this it is necessary a management focused on adapting the ruminal flora and achieving an adequate development of the papillae, starting with a moderate concentrate in fat, starches and high in fiber, to be introduced the concentrate of bait, high in starches and in CFU and low in fiber, in such a way that the animals efficiently convert the energy and the proteins consumed.
All these factors mean that the greatest number of diseases and casualties occur during the first month of fattening. For this reason, in many zoo sanitary programs antibiotics of long duration are applied to the arrival of the animals, to allow time for the vaccine therapy to work and to soften the immunosuppression.
Pronutrients are complex organic molecules of plant origin, capable of stimulating or regulating animal physiology WITHOUT causing pharmacological effects, resistance, residues or periods of suppression. The addition of immune boosting pronutrients in this stage stimulates the specific and non-specific immune system of the calf, by strengthening it. In addition, they reinforce the immune response to vaccination, increasing its effectiveness and increasing the specific immune response, having a positive impact on animal health and thus on productive and economic parameter.