Efekat dodavanja enzima proteaze na masu i udeo jestivih pratećih proizvoda klanja pilića

This study evaluates the effect of protease supplementation of reduced crude protein diet for broilers on the weight of edible slaughter by-products (liver, gizzard, heart and abdominal fat) and their proportion in the body weight of birds at slaughter in two broiler genotypes – fast-growing Cobb 500 and slow-growing Master Gris. Protease (Ronozyme ProAct) was added at a concentration of 0.2% (E-I group) and 0.3% (E-II group), allowing reduction in crude protein level by 4% and 6%, respectively (through reduced soybean meal content). The length of the fattening period was 49 days. The results show somewhat greater differences in the weight and proportion of edible slaughter by-products between the hybrids and a similar response to dietary treatments by broilers from the three experimental groups in both hybrids, given their similar weights of edible slaughter by-products (heart, gizzard and abdominal fat) and their proportions in the body weight of birds at slaughter (significance was observed only in liver weight in Cobb 500 - P<0.05).U radu su analizirani efekti dodavanja enzima proteaze u hranu za piliće u tovu, uz smanjen nivo sirovih proteina, na masu jestivih pratećih proizvoda klanja (jetre, bubca, srca i abdominalne masti) i njihov udeo u masi grla pre klanja kod dva tovna hibrida – brzorastućeg Cobb 500 i spororastućeg Master Gris. Enzim proteaza (Ronozyme ProAct) dodat je u koncentraciji 0,2% (O-I grupa) i 0,3% (O-II grupa) uz istovremeno smanjenje sadržaja sirovih proteina za 4%, odnosno za 6% (preko smanjenog učešća sojine sačme). Tov pilića trajao je 49 dana. Na osnovu rezultata iz ovih istraživanja, može se zaključiti da su se nešto veće razlike u masi i udelu jestivih pratećih proizvoda klanja ispoljile između ispitivanih hibrida, a da su pilići iz sve tri ogledne grupe kod oba hibrida slično reagovali na primenjene tretmane ishrane, shodno tome da su imali približno iste mase jestivih pratećih proizvoda klanja (srca, bubca i abdominalne masti), kao i udele svih delova u masi grla pre klanja (značajnost se pojavila samo u masi jetre kod hibrida Cobb 500 - P<0,05)

Masa i udeo osnovnih delova trupa kokoši nosilja iz alternativnih sistema gajenja

The aim of this paper was to investigate the effect of rearing system on mass and proportion of the main parts of carcasses of hens from alternative rearing systems: floor and organic. The tested genotypes were hybrid Isa Brown and races combined production capacity New Hampshire. Based on the results of this research, can be concluded that the rearing system had no a significant impact to any of the investigated traits. On the other hand, the effect of genotype was significant on weight classically dressed carcass, as well as the mass of all the main parts of the carcass, wings share and back and pelvis share. The percentage of classically dressed carcass, yield of breasts, thighs and drumsticks was not significantly influenced by genotype.Cilj ovog rada je bio da se ispita uticaj sistema gajenja na masu i udeo osnovnih delova trupova kokoši nosilja iz alternativnih sistema gajenja: podnog i organskog. Ispitivani genotipovi su bili laki linijski hibrid Isa Brown i rasa kombinovanih proizvodnih sposobnosti New Hampshire. Na osnovu rezultata ovih istraživanja, može se zaključiti da sistem gajenja nije imao značajan uticaj ni na jednu od ispitivanih osobina. Sa druge strane, uticaj genotipa bio je značajan na masu klasično obrađenog trupa, kao i na masu svih osnovnih delova trupa, udeo krila i leđa i karlice. Randman klasično obrađenog trupa, udeo grudi, bataka i karabataka nije bio pod značajnim uticajem genotipa

Unutrašnji kvalitet jaja kokoši nosilja iz različitih sistema gajenja

The aim of this study was to investigate the effect of different rearing systems: conventional - cage, free range and organic system of production of laying hens on the parameters of the internal quality of eggs: yolk color, albumen height and Haugh unit score. Eggs from both rearing systems with outlet had less intensive colored yolk than conventional - cage produced eggs. On the other hand, eggs from free range system had a lowest albumen height of egg and Haugh unit score compared to both eggs - from cage and eggs from organic production systems, which do not significantly differ in these parameters.Cilj ovog rada je bio da se ispita uticaj različitih sistema gajenja: konvencionalnog - kaveznog, sistema gajenja sa ispustom - tzv. "free range" i organskog sistama držanja kokoši nosilja na parametre unutrašnjeg kvaliteta jaja: boju žumanca, visinu belanca i broj Hogovih jedinica. Jaja iz oba sistema gajenja sa ispustom imala slabiji intenzitet obojenosti žumanca od konvencionalno - kavezno proizvedenih jaja. Sa druge strane, jaja iz sistema gajenja sa ispustom su imala manju visinu belanca i broj Hogovih jedinica i u poređenju sa jajima iz kaveznog i sa jajima iz organskog sistema proizvodnje, koja se međusobno nisu značajno razlikovala u navedenim parametrima