Acta Univ. Agric. Silvic. Mendelianae Brun. 2005, 53, 75-80

https://doi.org/10.11118/actaun200553040075
Published online 2014-12-25

The effect of composition feed mixtures on curve of hens laying intensity

Emil Mareček1, Dalibor Klecker2, Martina Lichovníková2, Ladislav Zeman3

1ÚKZÚZ Brno, Hroznová 8, 603 00 Brno, Česká republika
2Ústav chovu a šlechtění zvířat, Mendelova zemědělská a lesnická univerzita v Brně, Zemědělská 1, 613 00 Brno, Česká republika
3Ústav výživy zvířat a pícninářství, Mendelova zemědělská a lesnická univerzita v Brně, 613 00 Brno, Česká republika

The experiment was done in the experimental station ÚKZÚZ Havlíčkův Brod. There were four experimental groups (N1, N2, N3, N4) of laying hens and weekly laying intensity was observed. Hybrid ISA BROWN was used in the experiment, 405 hens in each group. The laying intensity was observed from the start of laying for 44 weeks. During laying four different diets were fed to laying hens (N1 – control group with fish meal, N2 – control group containing only of plant protein sources, N3 – experimental group with higher content of rapeseed, N4 – experimental group containing treated rapeseed). Yang model was used for the evaluation of laying curves and we found following parameters of the curves:
Yang model N1: y = 97.28 * e – 0.004 * t / [1 + e – 2.054 (t – 2.549)] R2 = 0.97
Yang model N2: y = 98.29 * e – 0.006 * t / [1 + e – 2.071 (t – 2.668)] R2 = 0.96
Yang model N3: y = 98.49 * e – 0.005 * t / [1 + e – 1.856 (t – 2.568)] R2 = 0.97
Yang model N4: y = 98.55 * e – 0.005 * t / [1 + e – 2.251 (t – 2.615)]. R2 = 0.97
The results document that experimental treatments had small effect on the parameters of laying curves. It means that rapeseed had only small effect on the laying intensity and also the elimination of animal protein from the diet for laying hens had not effect on laying intensity. On the base of our results we estimated the standard equation for evaluation of laying curve:
Yang model: y = 98.15 * e – 0.005 * t / [1 + e – 2.058 (t – 2.601)]. R2 = 0.99
This equation can be used as standard for evaluation of laying intensity after experimental treatments or for evaluation of laying intensity of different hybrids.

References

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