Mastleistung und Fleischqualität von männlichen Legehybriden bei Fütterung unterschiedlicher Proteinquellen

Summary

The effects of genotype and protein source on the performance of male layer hybrids compared to a fattening strain were investigated. The layer hybrids Lohmann Brown
(LB, n = 90, male), Lohmann Selected Leghorn (LSL, n = 90, male) and the fattening hybrid Hubbard JA-757 (HUB, n = 90, mixed sex) were divided into three feeding groups: 1) commercial feed with 25,5 % soybean cake (Control), 2) control diet + alfalfa meal ad lib. (Alf-ext) and 3) control diet inclusive 12 % replace of soybean cake by alfalfa meal (Alf-int). Fattening periods were 63, 91 and 104 days for HUB, LB and LSL, respectively. Final weights were influenced by the interaction of genotype and feed (HUB 1843, LB 1871, LSL 1631 g). Highest daily weight gains showed HUB,
followed by LB and LSL, not influenced by the diet. For LB and LSL, the proportions of leg muscle were higher than for HUB, while LB had lower proportions of breast muscles. Diet did not affect these parameters. Regarding meat quality, the maximum shear force of the right breast muscle was lower for HUB and LSL compared to LB and was not influenced by the diet. Breast raw protein and raw fat contents were higher for chicken fed Alf-int than Alf-ext.