Aquaculture as an agricultural activity in our country is capable ofproducing large amounts of different types and categories of fish. Climate andgeographic characteristics of our country, the terrain and development of agriculturalproduction as well as compliance with the principle of “sustainable development”,the position and importance of fishery in a multipurpose water utilization, mustdetermine the direction of development of the future trout production. The mostimportant type of fish grown in the trout fisheries in BiH is the rainbow trout,Oncorhynchus mykiss (Walbaum, 1792). In addition to the fact that growing thistype of fish is attractive to many producers, considering the high yield potential,it is also characterized by a significant level of tolerance to varying microambientconditions of the environment. Given the importance of fish production in Bosniaand Herzegovina, which is one of the rare branches of food sector that has fulfilledthe international standards and criteria and secured access to the markets of the EUcountries, it is necessary to establish optimal conditions to ensure high productivityof salmonid fisheries. Studying the reproductive cycles can provide very preciseand significant results of the overall condition of the entire organism during thisvery complex physiological process and of the overall population in the respectiveecosystem.

T he Rosy-faced (Agapornis roseicollis), also known as the Rosy-collared or Peach-faced lovebirds, are colourful, small in size, parrots from Psittaciformes order. These birds originated from south-west Africa, where they inhabit a dry, woodland, semi-desert and mountainous areas situated above 1600m of altitude (Radamaker and Corman, 2011). Due to their small size, beautiful colour of the feathers, easy maintenance and breeding, these parrots are often kept in captivity as pets. During the mid-1980s some of these birds escaped from the captivity and established healthy, breeding population (Andreasen et al., 1995) in the area of Phoenix and Arizona (USA). In veterinary practice is well known that birds kept in captivity are highly susceptible for different respiratory diseases. Recently there have been a couple of reports from different veterinary clinics regarding the treatment of respiratory system diseases in these parrots (Cooper et al., 2015; Andreasen et al., 1995; Nakano and Une, 2016). However, in available literature we did not find any data about the anatomy of respiratory system in these parrots. It is well known that the bird's respiratory system is structurally one of the most complex and in terms of functionality, the most efficient among the

Microscopic analysis of the skin and cuticle of wool fibers in Dubska pramenka show different qualitative parameters. The research study included different parts of the body and the samples of the wool fibers from different regions of the body. Histological description shows difference in the basic structurers of the skin in Dubska pramenka. A very pronounced thin epidermis, while dermis and hypodermis are more developed on the samples from the shoulder. Cornified flakes-cuticle of the root of the tail was of a fine structure, and cornified flakes from the rump showed the features of the rough wool fibers. "Transitional form of cuticle" was dominant on the shoulder. The qualitative parameters have a significant influence on the overall quality of wool in general, and the research contributes to a greater usability value of the wool and development of livestock farming in areas in a broader sense.

In Bosnia and Herzegovina, Montenegro, as well as in most Balkan countries, wool is a major environmental problem. After sheep shearing, farmers usually leave the wool at the shear sites, providing poorly degradable organic waste. The purchase price of such untreated wool is as low as its quality. By this research, we have tried to draw attention, from another aspect, to the quality of wool fibers of certain parts of the body, which is ultimately very important in the textile industry and in the selection of wool for further processing. The cuticle is made from cornfied cells, flakes, located on the surface of wool fibers. One of the significant roles of the cuticle is the protective. Namely, the cuticle protects the wool fibers from various external factors, whether mechanical or physic-chemical (such as ammonia evaporation in poorly maintained facilities, etc.), which can damage the fleece and thus make it less quality. We have found some differences in the flakes position and shape in the wool fibers we investigated, depending on part of the body from which they were sampled. However, by microscopic analyses of samples taken from the root of the tail, we have found that the flakes were much smaller and finer in structure than the arrangement and appearance of the cornified flakes from the rump. In this study, we have compared the appearance and arrangement of flakes of cuticle, which is very important in assessing the quality of wool and its further use as a raw material.