Effect of Dietary Acidifier on Growth, Mortality, Post-Slaughter Parameters and Meat Composition of Broiler Chickens / Wpływ zakwaszacza diety na masę ciała, śmiertelność, wydajność rzeźną i skład mięsa kurcząt rzeźnych

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Abstract

An experiment with 608 broiler chickens was conducted to investigate the effect of dietary acidifier level on body weight, feed consumption and conversion, mortality, dressing percentage, postmortem carcass traits, tissue composition of breast and leg muscles, and plasma chemical parameters. Feeding the acidifier to chickens at 3, 6 and 9 g/kg of the diet reduced the pH of starter and grower diets from 6.90 to 5.89, and from 6.28 to 5.73, respectively. Compared to the control group, dietary acidification significantly increased body weight of chickens by 6.2, 8.2 and 8.2% at 21 days of age, and by 2.7, 3.6 and 3.7% at 42 days of age, respectively (P<0.01). Mortality decreased from 2.58% in the control group to 0.00-0.59% in the experimental groups (P<0.01). Acidification of the diets increased EEI-index from 327 (control group) to 348 points in the experimental group supplemented with 9% (9 g/kg) acidifier, but had no significant effect on feed consumption and feed conversion ratio among treatments. The relative weight of breast and leg muscles, gizzard, liver and carcass depot fat was not affected by dietary treatments. Breast muscles represented 27.7% (control group) and 27.9% (experimental groups) of the carcass weight. Leg muscles made up 21.5% and 20.7% of the carcass weight, respectively. There were no significant differences in chemical composition of breast and leg muscles, including dry matter, protein and fat content. No significant differences between the control and experimental chickens were noted for determined blood plasma constituents, glucose, total protein, triglycerides, total cholesterol and high density lipoprotein. The results suggested that organic acid acidifier used in this experiment at the rates of 3 to 9 g/kg diet has a growth enhancing and mortality reducing effect in broiler chickens, with no significant influence on carcass yield, proportion of individual carcass parts and blood plasma constituents. It seems that the amount of 6g of the applied acidifier per kilogram of feed may be recommended as the optimum dietary level if protein in the diet does not exceed 200-230 g crude protein per kilogram of diet.

Streszczenie W doświadczeniu wykonanym na 608 kurczętach rzeźnych Ross 308 badano wpływ zakwaszacza diety na masę ciała, spożycie i wykorzystanie paszy, śmiertelność ptaków, wydajność rzeźną, cechy poubojowe tuszek, skład chemiczny mięśni piersiowych i nóg oraz wskaźniki chemiczne osocza krwi. Podawanie zakwaszacza kurczętom w ilości 0, 3, 6 i 9 g/kg diety obniżyło odczyn (pH) diety na pierwszy okres chowu (1-21 dni) z 6,90 do 5,89, a drugi okres chowu (22-42 dni) z 6,28 do 5,73. W porównaniu z grupą kontrolną, nie otrzymującą zakwaszacza, istotnie wzrosła masa ciała kurcząt 42. dnia życia, odpowiednio o 2,3; 3,6 i 3,7% (P<0,01). Śmiertelność zmalała z 2,58% w grupie kontrolnej do 0,00-0,59% w grupach doświadczalnych (P<0,01). Zakwaszenie diety nie miało istotnego wpływu na spożycie i wykorzystanie paszy. Nie stwierdzono istotnych różnic w masie mięśni piersiowych i mięśni nóg, a także masie żołądka, wątroby i tłuszczu zapasowego ptaków. Mięśnie piersiowe miały 21,6% w grupie kontrolnej i 21,3% masy tuszki w grupie doświadczalnej. Zakwaszenie diety zwiększyło wartość indeksu EEI z 327 (grupa kontrolna) do 348 (grupa doświadczalna), przy 9 g/kg zakwaszacza. Nie stwierdzono istotnych różnic w składzie chemicznym mięśni piersiowych i mięśni nóg, w tym zawartości suchej masy, białka ogólnego, tłuszczu surowego i popiołu. Zawartość białka w mięśniach piersiowych wynosiła 23,58% w grupie kontrolnej i 23,86% średnio w grupach doświadczalnych (P≥0,01). Zawartość białka w mięśniach nóg wynosiła odpowiednio 19,56% i 19,58% (P≥0,01). Nie stwierdzono istotnych różnic we wskaźnikach osocza krwi. Wnioskowano, że zakwaszacz zawierający kwas propionowy i sole kwasu mrówkowego oraz masłowego poprawia efektywność produkcji kurcząt rzeźnych istotnie obniżając straty powodowane zakażeniami bakteryjnymi przewodu pokarmowego. Użycie zakwaszacza od 3 do 6 g/kg diety istotnie zwiększa masę ciała i tuszek kurcząt nie powodując istotnych różnic w masie i proporcjach poszczególnych partii tuszek. Optymalny poziom preparatu of Acidomix AFG w diecie dla kurcząt zawierającej 206-230 g białka ogólnego wynosił 6 g/kg.

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Annals of Animal Science

The Journal of National Research Institute of Animal Production

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