Tenebrio molitor larvae represent a sustainable protein source for food and feed. The aim of this study was to evaluate the supplementation of chestnut shell, a by-product of the agro-industrial chain, in growth substrates for T. molitor larvae rearing. Seven-week-old larvae were reared on three different growth substrates: the control group (CTRL) was fed wheat bran, treatment group one was fed wheat bran supplemented with 12.5% w/w chestnut shell (TRT1), and treatment group two was fed wheat bran supplemented with 25% w/w chestnut shell (TRT2). Larval weight, substrate consumption, and mortality were recorded weekly. After 14 days, insect meals were produced for bromatological and colorimetric analysis, and bacterial inhibition activity assay using a microdilution method. The amino acid profile of insects was determined using quantitative nuclear magnetic resonance spectroscopy. Our results showed a lower feed conversion ratio and higher larval survival rate % in TRT2 compared to CTRL (p < 0.05). Proteins and lipids of TRT2 were higher than other groups (p < 0.05). Important differences were observed in the amino acid profile of TRT1 and TRT2 compared to CTRL (p < 0.05). TRT1 and TRT2 showed higher E. coli inhibitory activity than CTRL (p < 0.05). In conclusion, chestnut shell supplementation improved the survival and functional characteristics of larvae and likely impacted the insects’ metabolism.

Nutrition and health during pre-weaning affect the calves’ future fertility, calving age, production, and carrier length. Calves are highly susceptible to neonatal calf diarrhea (NCD), which can be fatal. NCD is due to hypovolemia and acidosis, which may involve anorexia and ataxia. The One Health principle calls for a drastic reduction in antimicrobial use. One approach is to improve animal health and reduce the use of antibiotics and functional ingredients that have beneficial effects due to bioactive compounds. Several functional ingredients and additives can be considered, and, in particular for this study, Ascophyllum nodosum was considered. The present study aimed to evaluate the role of A. nodosum as a functional ingredient implemented into the milk replacer in neonatal calves. Twelve pre-weaned Holstein Frisian calves, housed in twelve individual pens in the same environmental conditions, were divided into two groups of six animals: a control group (CTRL, n = 6) fed with a milk replacer, and a treatment group receiving milk enriched with 10 g of A. nodosum in their diet (TRT, n = 6) for 42 days. The fecal score was evaluated daily (3–0 scale) to monitor the incidence of diarrhea in the two groups. The body weight was evaluated weekly, and every two weeks feces were collected for microbiological evaluation using a selective medium for plate counting of total, lactic acid, and coliform bacteria. To verify the presence of Lactobacillus, Bifidobacterium, and Escherichia coli, real-time qPCR was used. At the beginning and at the end of the trial, blood samples were obtained for serum metabolite analysis. The growth performance did not differ in either of the two groups, but significant differences were observed in the incidence of moderate diarrhea (p-value < 0.0113), where the TRT group showed a lower incidence of cases during the 42-day period. Serum analysis highlighted higher contents of albumin, calcium, phosphorus, and total cholesterol in the TRT group compared to CTRL (p-value < 0.05). In conclusion, implementation of A. nodosum in the diet of calves can lead to better animal welfare and may reduce the use of antibiotics.

Background: Achieving sustainable development in accordance with Agenda 2030 (Sustainable Development Goals 12, 13, and 17) has challenged the livestock sector and especially swine farming. Strategies focused on reducing the environmental impact and improving feed efficiency have therefore been explored. Due to its beneficial properties, the application of biochar represents an interesting solution. This study therefore evaluates the effects of biochar supplementation on growth performance and health parameters in weaned piglets. Methods: A total of 223 piglets were divided into two experimental groups: the control (CTRL) group and the treatment (TRT group). The experiment involved two dietary treatments: the CTRL group was fed a standard diet, while the TRT group was fed the same diet supplemented with 1% chestnut biochar. Weekly measurements included body weight, feed intake, and fecal scores. Fecal samples were collected for microbiological analysis and evaluation of digestibility. Results: No significant differences were observed between the groups in terms of the principal zootechnical parameters. The TRT group showed lower E. coli counts in feces at 14 days and a significant decrease in diarrhea frequency at 28 days (32.14% CTRL vs. 3.23% TRT; p = 0.009). Protein digestibility was higher in the TRT group (79.5 ± 1.74%) compared to the CTRL group (75.0 ± 2.05%; p = 0.004). Additionally, the TRT group had significantly lower levels of derivates of reactive oxygen metabolites than the CTRL group (293.44 ± 59.28 vs. 553.98 ± 61.59 Carratelli units p ≤ 0.001). Conclusions: The inclusion of 1% biochar in the diets of post-weaning piglets can improve the health status of the animals. Biochar could thus be used as a valuable functional ingredient within an innovative nutritional strategy aimed at the management of gastrointestinal problems during the weaning period.