20.500.12556/RUL-131708 Vpliv tipa gredi in genotipa kokoši na uporabo gredi in poškodbe grodnice Effects of perch design and genotype on perch use and keel bone damage in laying hens Poškodbe grodnice predstavljajo velik problem v reji kokoši nesnic po celem svetu in negativno vplivajo na dobrobit živali in proizvodne parametre. V poskusu smo skušali ugotoviti, kako v obogatenih kletkah na stopnjo poškodbe grodnice in uporabo gredi vpliva tip gredi (z ali brez gume) ter genotip nesnic (Prelux rjave, črne in grahaste nesnice). V poskus smo vključili 357 nesnic. Polovica nesnic vsakega genotipa je bila uhlevljena v kletkah, kjer so bile gredi obložene z gumo, druga polovica v kletkah z gredjo brez gume. V petih 12 dnevnih opazovalnih obdobjih (pri 25,5, 29,5, 33,5, 37,5 in 41,5 tednih) so bili zabeleženi podatki o nesnosti, zauživanju krme, telesni masi, operjenosti in poškodbah grodnice. Pri 29,5, 33,5 in 37,5 tednih starosti smo s snemanjem beležili mirovanje nesnic stoje oz. sede na gredeh oz. mrežastih tleh kletk. Ob koncu poskusa je bil izveden test plašnosti. Statistično značilno (P ⡤ 0,05) hujša stopnja poškodbe grodnice je bila zaznana pri nesnicah uhlevljenih v kletkah z gredjo z gumo. Genotip nesnic ni značilno vplival na poškodbe in mirovanje. Za zmanjšanje stopnje poškodbe grodnice ne bi priporočili te vrste in stopnje mehkobe gume na gredeh, vseeno pa bi mogoče morali premisliti o nekoliko mehkejših materialih, ki bi nudili večje udobje ob mirovanju na gredi in blažili pritisk na grodnico. Keel bone damage is one of the major welfare and health problems of commercial laying hens and is known to affect the welfare and production parameters of laying hens. The present study aims to investigate the effects of perch type (with or without rubber) and genotype (Brown, Black and Barred Prelux) of laying hens on keel bone damage. 357 laying hens were included. Half of the hens of each genotype were housed in enriched cages with perches covered with rubber, and half of the hens of each genotype were housed in cages with perches without rubber. During five 12-day periods (at 25.5, 29.5, 33.5, 37.5, and 41.5 weeks of age), we collected data on egg productivity, feed consumption, feather condition, body mass, and keel bone damage. At 29.5 and 37.5 weeks of age, we recorded duration of resting periods while sitting and standing on perches and wire floors. At the end of this study, we conducted the Tonic Immobility Test. Laying hens housed in cages with rubber perches had statistically significant (P ⡤ 0.05) more severe damage to the keel bone. Genotype had no significant effect on keel bone damage or on any form of resting. We do not recommend using this type of rubber for perches as it does not contribute to the welfare of the laying hens. However, perhaps we should consider using softer materials for perches that may provide more comfort during resting and reduce pressure on the keel bone during resting. perutnina kokoši nesnice dobrobit živali proizvodni parametri grodnica poškodbe poultry laying hens welfare production parameters keel bone damage true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2021-10-01 10:21:48 2021-10-01 10:21:50 2022-09-10 04:13:17 0000-00-00 00:00:00 2021 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 199328 78852099 21294.pdf 21294.pdf 1 B228211201E06E4E939D9E501ED7C718 e7c91d458aeab50b15b666825858d3334df371eaac56145a834dc79ee8cd8e40 575c96b4-2290-11ec-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=149098 Biotehniška fakulteta 0 0 0