Budowa histologiczna i właściwości fizykochemiczne skór buhajków pochodzących z kojarzenia krów rasy czarno-białej z buhajami różnych ras mięsnych
AbstractThis study was aimed to evaluate the effects of crossing Black-and-White cows with Italian beef breed bulls (Piemontese, Chianina and Marchigiana) and their crossbreds with Aberdeen Angus, and of crossing Black-and-White cows with Aberdeen Angus and Simmental bulls on the qualitative and quantitative traits of the obtained leather. In order to determine whether the resilience and plasticity of leather could be improved through crossing with the aforementioned breeds, analyses of the physical parameters and histological structure of skin tissue were performed. Consideration was also given to the effect of collagen level, including its mature forms, in hide on the strength parameters of leather. After tanning, the area efficiency of leather was determined and leather grading was performed. It follows from the results that two-breed crossbreds by Piemontese, Chianina and Aberdeen Angus bulls, as well as three-breed ones by the above-mentioned hulls have thick grain and reticular layers in the dermis. A high proportion of the grain layer with numerous branched elastin and collagen fibres in the dermis of two-breed crossbreds by Piemontese and Chianina bulls contributed to the increased tensile and Lear strengths of their leathers. Observations made with the use of light and scanning electron microscopes indicate a more uniform distribution of collagen fibres and their smaller diameter in the skin tissue of two-breed crossbreds by Piemontese, Chianina and Aberdeen Angus bulls than in other groups under study. Three-breed crossbreds by Piemontese and Aberdeen Angus bulls were characterised by a large number of thin fibres in a bundle, densely spaced, which to a great extent affected the sensory properties of leather after tanning. Organoleptic assessment revealed a high delicacy, softness and elasticity of the skin tissue. The hides of two-breed crossbreds by Aberdeen Angus bulls, and also of three-breed ones by Piemontese and Aberdeen Angus bulls displayed the most uniform structure throughout their area. This makes it possible to cut out larger pieces of leather having similar mechanical parameters. The high collagen content of the hides of two-breed crossbreds by Aberdeen Angus bulls suggests that their fibres form a dense network, which is confirmed by high values of tensile strength measured in this group. The lack of hydroxyproline in the solution left after rinsing the hide with a citrate buffer indicates that none of the investigated hides contained immature collagen forms, such as procollagen or tropocollagen. High values of tensile and tear strength of leathers obtained from two-breed crossbreds by Piemontese and Chianina bulls testify that their collagen fibres have a strong and well-shaped splice. These leathers can thus be used in products requiring special resistance to various kinds of strain. In final classification the leathers of crossbreds by Piem.ontese and Chianina bulls showed better quality parameters than other groups. They had a correct softness and fullness, firin structure of flanks and groins, and a smooth grain layer with delicate granulation. The best quality parameters for shoe uppers were found in tanned leathers from two-breed crossbreds between Black¬-and-White cows and Piemontese and Chianina bulls, and from three-breed ones among Black-and-White cows and Piemontese, Chianina and Aberdeen Angus bulls. Due to the fact that the leathers of crossbreds by Piemontese bulls scored high marks on elongation at break and the softness and elasticity of the skin tissue, they should be considered appropriate for the uppers of light-type shoes.
|Other language title versions||Histological structure and physico-chemical properties of hides of young bulls obtained by crossing Black-and-White cows with bulls of different beef breeds|
|Publisher||Uniwersytet Rolniczy im. Hugona Kołłątaja w Krakowie, MNiSW |
|Publishing place (Publisher address)||Kraków|
|Book series /Journal (in case of Journal special issue)||Zeszyty Naukowe Akademii Rolniczej im. H. Kołłątaja w Krakowie. Rozprawy, ISSN 1233-4189, (0 pkt)|
|Publication size in sheets||5.1|
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