2 research outputs found

    Slaughter value and meat quality of guinea fowls slaughtered at a different age

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    W Polsce nie prowadzi si臋 przemys艂owej produkcji perlic rze藕nych, ale potrzeby rynku mi臋snego mog膮 si臋 zmieni膰 w zwi膮zku ze zmian膮 upodoba艅 konsument贸w oraz rozszerzeniem rynk贸w zbytu. Celem przeprowadzonych bada艅 by艂a ocena wp艂ywu wieku na warto艣膰 rze藕n膮 i jako艣膰 mi臋sa perlic. Nie uwzgldniono wp艂ywu p艂ci, gdy偶 u m艂odych perlic brak jest wyra藕nego dymorfizmu p艂ciowego. Badania przeprowadzono na perlicach 偶ywionych mieszankami pe艂noporcjowymi bez antybiotykowego stymulatora wzrostu i odchowywanych do 18. tygodnia 偶ycia. Ub贸j ptak贸w wykonywano w 14., 16. i 18. tygodniu 偶ycia. W ka偶dym z termin贸w ubijano po 10 ptak贸w, okre艣laj膮c wydajno艣膰 rze藕n膮, procentowy udzia艂 poszczeg贸lnych mi臋艣ni, pH oraz sk艂ad chemiczny mi臋艣ni piersiowych i n贸g. 艢rednia masa cia艂a perlic w kolejnych terminach uboju: 14., 16., 18. tygodniu 偶ycia wynosi艂a odpowiednio: 1181 g, 1314 g i 1373 g. Wydajno艣膰 rze藕na perlic niezale偶nie od ich wieku by艂a zbli偶ona i waha艂a si臋 od 73,61 do 74,49%. Najwi臋kszy udzia艂 mi臋艣ni piersiowych, udowych i podudzi stwierdzono u perlic ubijanych w 14. tygodniu 偶ycia, stanowi艂y one odpowiednio: 17,66, 10,23 i 6,13%. Odczyn pH mi臋艣ni wraz z wiekiem ptak贸w obni偶a艂 si臋, a odczyn pH mi臋艣ni n贸g by艂 zawsze wy偶szy od odczynu mi臋艣ni piersiowych. Zawarto艣膰 bia艂ka og贸lnego w mi臋艣niach piersiowych wynosi艂a od 23,72 do 26,37% a w mi臋艣niach podudzi od 21,04 do 23,20%, a zawarto艣膰 t艂uszczu odpowiednio: od 0,84 do 1,12% i od 2,38 do 5,86%. Na podstawie przeprowadzonych bada艅 mo偶na stwierdzi膰, 偶e odch贸w perlic przeznaczonych do uboju powinien by膰 zako艅czony oko艂o 14 tygodnia 偶ycia.Slaughter guinea fowl are not produced in Poland on an industrial scale, but the demands of the meat market can change at any time to meet consumer demand or in reaction to expanding markets. The objective of the study was to determine the effect of age of the birds on slaughter yield and their meat quality. No effect of the bird鈥檚 gender was included as young guinea fowls showed no distinct sexual dimorphism.The study involved guinea fowl fed on full-portion mixtures containing no antibiotic growth stimulator; the birds were reared up to the 18th week of life. The bird slaughter was performed on week 14, 16, and 18 of life, and 10 birds were slaughtered in each of the three terms, and at the same time, the following factors were determined: slaughter yield, composition, pH, and chemical composition of breast and leg muscles. Mean weights of the guinea fowl bodies were: 1181 g, 1314 g, and 1373 g, respectively in the subsequent slaughter terms 14, 16 and 18 weeks of life. The slaughter yields of the guinea fowls, regardless of their ages, were similar and ranged from 73.61 to 74.49%. The guinea fowls slaughtered on week 14 of life had the highest per cent contents of breast, thigh, and leg muscles; they were 17.66%, 10.23%, and 6.13%, respectively. The pH of muscles decreased with bird age and pH of leg muscles was always higher than pH of breast muscles. The content of total protein in breast muscles ranged from 23.72 to 26.37% and in the leg muscles: from 21.04 to 23.20%. The fat content ranged from 0.84 to 1.12% and from 2.38 to 5.86%, respectively. The results of this study indicate that the slaughter guinea fowl rearing period should be completed on, approximately, week 14 of life
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