Effect of different fat content in feed mixtures for laying hens on the quality of yolk
2000
Horniakova, E. (Slovenska Polnohospodarsak Univ., Nitra (Slovak Republic). Katedra Vyzivy)
In the trials with Shaver Starcross laying hens the effect of different fat content in feed mixtures on quantity and quality of egg yolk was studied. The laying hens were divided into three experimental groups. They were fed by feed mixtures with 24.18 - 31.22 - 39.76 g of fat content per kilogram, while 83.5 - 90.0% of fat was of plant origin. The control group was fed with commercial feed mixture for laying hens (21.0 g of fat per kg of feed mixture and 80,7% of fat portion originated from plant components). The results of experiment showed that higher fat content in experimental feed mixtures were not statistically significant in weight and index of egg yolk. An increasing portion of fat from rape cake comfirmed a tendency to decrease yolk weight from 15.0 - 14.58 g and yolk index from 0.385 - 0.374. The content of protein increased with increasing fat content to maximum 2.75%. The fat content increased only in the first experimental group (by 1.25%) while in the second and third groups decreased by 0.93 and 0.52%. Linolic acid content ration in observed groups was 1 : 1,21 : 1,91 : 1,24 and ration of polyunsaturated to saturated acids was 0.138 : 0.144 : 0.233 : 0.147
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