The fatty acid (FA) composition of cattle is correlated with cardiovascular diseases in humans. These FAs come from ruminal biohydrogenation; however, this process also produces FAs that can provide benefits to human health. Sex and diet can affect the FA profile of the meat. The meat FAs of cattle in feedlot systems are different due to diet differences. This study aimed to evaluate the effect of sex on the FA profile and meat quality of feedlot cattle fed a whole shelled corn diet.

The present study addressed the interactive effects of concentrate levels (low (40 %) and high (60 %)) and plant (pomegranate, garlic, or sunflower) oils on in vitro rumen fermentation kinetics. Results indicated that the interaction of diet and oils had no significant effect on in vitro gas production parameters. Data suggested no effect for unconventional oil on in vitro rumen fermentation in either high or low concentrate diets.

This research was conducted to valorize crude olive cake, extracted olive cake, and olive leaves using an exogenous fibrolytic enzyme in ruminal nutrition. This additive improved only the nutritional value of crude olive cake and olive leaves. These results can encourage breeders to use this waste as feed at a low cost in animal nutrition. This valorization of waste is a good solution to reduce pollution.

The objective of this study was to evaluate the intake, digestibility, nitrogen balance, and performance of feedlot lambs fed diets containing crude glycerin. Although it did not affect the intake and digestibility of most nutrients, the inclusion of 100 and 200 g kg^-1 DM of crude glycerin in lambs' diets tended to worsen performance, indicating that the ideal level of inclusion should be below 100 g kg^-1 DM of crude glycerin.

Interannual and monthly variations of herbage production and nutritive value regarding the needs and welfare of grazing ruminants were evaluated in three grasslands located at different altitudes in northern Greece. The sub-alpine grassland was the most productive, with the highest mean annual CP content. Herbage Ca content was sufficient for the animals’ needs, while protein and phosphorus supplementation should be provided in order to cover their requirements and reach high levels of welfare.