Long-term application of clinoptilolite via the feed of layers and its impact on the chemical composition of long bones of pelvic limb (femur and tibiotarsus) and eggshell
2008
Herzig, I.,Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Fakulta Veterinarni Hygieny a Ekologie | Strakova, E.,Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Fakulta Veterinarni Hygieny a Ekologie | Suchy, P.,Veterinarni a Farmaceuticka Univ., Brno (Czech Republic). Fakulta Veterinarni Hygieny a Ekologie
Hybrid layers (Bovans Goldline) were divided into a control (C, n=60) and an experimental (E, n=60) group. The layers were raised in a three-floor cage technology and fed ad libitum. The experimental period started in the 22nd week and ended in the 68th week of age of the layers. E layers received 1% of clinoptilolite (commercial additive ZeoFeed) as a substitute for the same portion of wheat in the feed mixture. The intensity of egg laying increased by 1.1% in E animals. The average egg weight was 66.3+/-6.25 g in C hens and 65.6+/-5.44 g in E hens (P less than 0.05). Feed consumption per one egg was lower by 4.1 g in E than in C hens. Experimental eggshells had a significantly higher content of crude protein, Ca and Mg than control eggshells. In most cases, concentrations of crude protein, ash, Ca, Mg and P in femur and tibiotarsus were significantly higher in E than in C hens. The long-term application of clinoptilolite favourably influenced the accumulation of Ca, P, Mg and crude protein in the eggshell as well as in limb bones, increased the egg production and reduced the consumption of feed mixture per one egg.
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