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THE INFLUENCE OF LEVEL AND SOURCE OF COPPER IN DIET OF PIGS ON SLAUGHTERING RESULTS AND PHYSICAL AND CHEMICAL CHARACTERISTICS OF BACK FAT AND MUSCLE TISSUE
Zdravko Crnojević
; Poljoprivredni fakultet Zagreb
Stevo Jančić
; Poljoprivredni fakultet Zagreb
Milovan Pešut
; Poljoprivredni fakultet Zagreb
Hrvoje Ćosić
; Poljoprivredno-industrijski kombinat, Đakovo
Sažetak
The objectiv of this study was to obtain additional information relative to the source of copper in diet of fattening pigs; to determine the influence of high level and different source of copper on performance (daily gain and feed conversion), slaughtering results (carcass weight, dressing percentage, length of carcass, back fat thickness) and on certain characteristics of back fat and muscle tissues (ash, fat, Fe and Cu contents in meat; iodine number of fat and fatty acid composition of back fat). The experimental pigs were treated with 250 ppm Cu as follows:
Group I - basal diet plus 0.1 per cent of CuSO₄
Group II - basal diet plus 0.090 pen cent of CuSO₃
Group III - basal diet plus 0.0314 per cent of CuO
Group - IV basal diet plus 0.067 per cent of CuCl₂
Bask fat and muscle samples for analysis were taken between the 13th and 14th vertebrae of the carcass. On the bais on the basis of obtained results the following conclusions could be drawn: (a) the pigs treated with CuSO₄ and CuO, respectively, have had significantly higher daily gain (P < 0,01) than pigs treated with CuCO₃, and CuCl₂, respectively: (b) the feed conversion was very a like and there were no significant difference between groups; (c) different sources of copper in diets have had significant effect on certain slaughtering results: the pigs of group three treated with CuO have had very significantly higher dressing percentage (P< 0.01) than pigs treated with CuSO₄, and significantly higher (P < 0.05) than pigs treated with CuCO₃; the pigs treated with CuSO₄ and Cu0, respectively, have had significantly thicker back fat (p < 0.05) than pigs treated with CuCO₃, and CuCl₂, respectively; (d) different sources of copper in diet had no significant effect on ash and Cu content in muscle samples, but have had, significant effect on fat and Fe content; (e) water - binding ability of muscle tissue was significantly (p <0.05) lower in groups of pigs treated with CuSO₄ and CuCo₃, respectively; f) the pH value of muscle tissue was higher in pigs treated with CuCO₃ and CuO, respectively, than in pigs treated with CuSO₄ and CuCl₂, respectively; (g) iodine - number of fat tissue was significantly higher in pigs treated with CuCO₃, than in pigs treated with CuCl₂; (h) different sources of copper in diet had no significant effect on the fatty acid composition of fat tissue.
Ključne riječi
Hrčak ID:
165372
URI
Datum izdavanja:
30.7.1975.
Posjeta: 659 *