This study was carried out to determine the effects of different doses (5g/kg, 10g/kg, 15g/kg) of rosehip fruit, which is a source of ascorbic acid (vitamine C), on fertility rate, chick quality and some blood parameters in the feed of breeder hens and roosters raised under high altitude and cold stress. It was applied during 12-week trial. While the fertility rate was not significantly affected by the treatments, the plasma vitamine C content of the laying hens was significantly affected by the treatments (P < 0.0001). While the lowest plasma vitamine C content was determined as 34.54 µg/ml in the control group, it was determined as 53.23, 133.40 and 214.69 µg/ml in the groups receiving rosehip fruit, respectively. When the blood plasma values were examined, the difference among the groups was found to be significant only in terms of triglyceride values in laying hens and uric acid values in roosters (P < 0.05). Likewise, the difference among the groups in terms of hatching body weight values of chicks was found to be statistically significant (P < 0.05). As a result, it can be said that 5 g/kg rosehip fruit can be added to the diets of breeder hens and roosters exposed to high altitude and cold stress.

The aim of this study was to compare nutrient content, and in situ protein and organic matter degradation kinetics of Prangos ferulacea (L.) (locally called helis), a naturally growing plant on the top of Mount Artos, with those of alfalfa. P. ferulacea plants used in the study were collected from three different parts of Mount Artos in Van Province over two years. While organic matter content and in vitro organic matter digestibility of P. ferulacea were significantly higher, neutral detergent fiber, acid detergent fiber, and acid detergent insoluble nitrogen contents were significantly lower compared with those of alfalfa (P < 0.01). In general, in situ dry matter, and organic matter and crude protein degradability of P. ferulacea were significantly higher compared with those of alfalfa starting from 6 h of incubation (P < 0.05). Organic matter and crude protein degradability of P. ferulacea was 79.15% and 85.31%, respectively, after 48 h of incubation. By-pass protein content and both organic matter and crude protein degradation rates were similar between samples (P > 0.05). It can be concluded that P. ferulacea has a better nutrient quality compared with even high quality alfalfa based on nutrient contents and digestibility values, and therefore substitution of alfalfa by P. ferulacea in the diet of ruminant animals is feasible.

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Fish meal is obtained as a result of the processing and drying of fish that are not suitable for human consumption and the wastes left in the fishing industry, or by passing them through various technological processes. Fish meal, one of the two main products of the fishing industry, is used in feeds as a protein source with high digestibility with its high content of amino acids, vitamins, and minerals. Fish meal is one of the most important features that makes it superior to other feed raw materials due to the essential amino acids and long-chain polyunsaturated fatty acids it contains. With the addition of fish meal to the ration performance and immune system of young animals are positively affected. It is stated that fish meal can be added 3-10% to poultry rations, 5% to cattle and sheep rations, and 10% to pig rations. In Türkiye, a significant part of fish meal and oil production is carried out in the Black Sea Region. In this study, the nutrient content of fish meals taken from four different fish meal production factory in the Black Sea Region was evaluated. Accordingly, the highest values are; dry matter (DM) 95.90% (p&lt;0.0001) and ash 17.20% (p&lt;0.0001) in D factory, crude protein (CP) 73.40% (p&lt;0.0001) in A factory, crude oil ether extract(EE) 11.33% (p&lt;0.01) in B factory, metabolic energy(ME, poultry) 3537.5 Kcal kg-1 (p&lt;0.001) in B factory were determined. It was determined that there was no statistical difference among the factories in terms of linoleicacid and linolenic acid amounts of essential fatty acids (p˃0.01), while palmitic acid, palmitoleic acid and oleic acid levels were found to be significant in B factory (p˃0.001). It has been observed that there is a difference in nutrient contents among the fish meal mostly produced in the Black Sea Region in our country.