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This study aimed to evaluate the effects of ground or steam-flaked corn and zinc-enriched yeast addition to grower pellet feed on fattening performance, rumen papillae development, and some blood parameters in lambs. For this purpose, thirty-six Kivircik male lambs were selected and divided equally into six groups: basal diet containing pellet feed without different corn form and yeast (control), basal diet 80% + ground corn 20% (PGC), basal diet 80% + steam-flaked corn 20% (PFC), PGC + Zn-enriched yeast (PGCZnY), PFC + Zn-enriched yeast (PFCZnY), and control + Zn-enriched yeast (PZnY). They were fed for 56 days according to the diets mentioned above. At the conclusion of the evaluations in fattening performance, rumen papillae development, and some blood parameters, there were no significant differences in body weight gain, average daily gain, average daily feed intake, and feed efficiency among the experimental groups. In the PGCZnY group, rumen papillae length was found to be higher than the other experimental groups. At the end of the trial (day 0), leukocyte and lymphocyte counts decreased significantly only in the control group compared with the other groups in the present study. Serum blood urea nitrogen (BUN) values, analyzed at the beginning and at the end of the trial, increased significantly in all groups except in the PGCZnY group. Supplementation of Zinc-enriched yeast to ground corn can be used for increasing ruminal papilla length, however decreasing the serum BUN levels in lambs during the fattening period.

Aim: This review was made to determine the effects of using tannin on the fermentation quality and animal nutrition as a different alternative to the additives used to prevent the spoilage of silages, which are widely used in today's livestock. Tannins are polyphenolic compounds and are natural compounds with a characteristic odor, acrid taste, and different colors from yellow to white, which can also be found in feeds such as gallnut, oak, chestnut and rapeseed, broad bean, sorghum. Since BC 1500 they have been used in various fields from medicine to food. Apart from its antidiarrheal, antiseptic and anthelmintic effects, its most well-known feature is that it forms compounds with proteins. The high protein/water presence of the feed to be ensiled makes ensiling difficult and affects fermentation negatively. High protein will reduce lactic acid formation in silages due to proteolysis and the desired pH value will not be reached. It is thought that tannins can form compounds with proteins and prevent proteolysis in silages and provide by-pass properties to proteins. Thus, the proteins that pass through the rumen will be digested in the small intestine and their utilization will increase. In addition, methane gas produced by ruminants causes loss of gross energy and contributes to global warming with greenhouse gas. Tannins are considered as an alternative to reduce methane gas and dispose of waste ammonia. Conclusion: The use of tannin in silages can facilitate the ensiling of high protein feeds, increase their quality, and meet the nutrient needs of animals better. It can improve the storage conditions of roughage. An innovative feeding method can be provided by reducing the methane production of animals that consume tannin-containing feeds. It can be a natural approach to the disposal of ammonia.