Influence of in ovo and pre-starter zinc and copper supplementation on growth performance and gastrointestinal tract development of broiler chickens | Vpliv dodatka cinka in bakra v jajce in v krmo po izvalitvi na rast in razvoj prebavil pri brojlerskih piščancih

anglais. This experiment was on 350 uniform sized Cobb broiler hatching eggs (60 g) to assess the response of trace mineral supplementation (Zinc and copper) on growth performance and gastrointestinal tract development in broiler chicken. The fertile eggs were divided into groups with in ovo trace mineral solution containing zinc (80 µg) and copper (16 µg) and without in ovo administration. After hatching, the chicks were further divided into four groups: Group I served as control without in ovo and without post-hatch supplemented diet (WoINOVO-WoPHS), birds in Group II were without in ovo and with post-hatch supplemented diet (WoINOVO-WPHS) (100 % higher level of zinc 200 ppm, copper 30 ppm in diet), birds in Group III had in ovo (zinc, 80 µg; copper,16 µg) and without post-hatch supplemented diet (WINOVO-WoPHS) and birds in Group IV had in ovo and with post-hatch supplemented diet (WINOVO-WPHS). Data collected were subjected to completely randomized design. Hatchability, live weight gain, feed intake and feed conversion ratio at 0–3 wk were not affected (p > 0.05) by in ovo administration of the mineral. Post-hatch supplementation of zinc and copper without in ovo supplementation showed better feed conversion ratio at 3–5 wk of age.  It could be recommended that for improved post-hatch performance, broiler chickens diets could be supplemented with inorganic zinc and copper.

slovène. Poskus je bil izveden na 350 valilnih jajcih pitovnih piščancev Cobb enotne velikosti, da bi ocenili odziv na dodatek mikromineralov (cink in baker) na rast in razvoj prebavil pri pitovnih piščancih. Oplojena jajca so bila razdeljena v dve skupini, ena je bila tretirana z raztopino cinka (80 µg) in bakra (16 µg), druga pa ne. Po izvalitvi so bili piščanci razdeljeni v štiri skupine: skupina I je služila kot kontrola brez poseganja v jajce in brez dodatka krmi po izvalitvi (WoINOVO-WoPHS), skupina II ni dobila cinka in bakra v jajce, ampak samo v krmo po izvalitvi (WoINOVO-WPHS), skupina III je dobila cink in baker v jajce, ne pa v krmo po izvalitvi (WINOVO-WoPHS), in skupina IV, ki je dobila dodatek cinka in bakra v jajce in v krmo po izvalitvi (WINOVO-WPHS). Zbrani podatki so bili uporabljeni za randomizirano zasnovo poskusa. Valilnost jajc, prirast, zauživanje in izkoriščanje krme v obdobju od izvalitve do treh tednov starosti niso kazali vpliva dodatka cinka in bakra (p > 0,05). Dodajanje cinka in bakra po izvalitvi brez dodajanja v jajca je bilo povezano z boljšim izkoriščanjem krme med 3. in 5. tednom starosti. Za boljše proizvodne rezultate priporočamo dodajanje anorganskega cinka in bakra v krmo za piščance.