The effect of chopped, extruded and pelleted alfalfa silage on the egg quality of organic laying hens

Carrasco, S.; Wüstholz, J.; Bellof, Gerhard

doi:10.1016/j.anifeedsci.2016.06.001

Cited by 9 publications

(8 citation statements)

References 35 publications

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“…The total content of n-3 acids was 3-fold higher than that in yolks from eggs laid by the control hens. This relationship was not confirmed by other authors who did not detect a positive effect of alfalfa silage or protein concentrate on the total content of PUFA in egg yolks ( Grela et al., 2014 , Carrasco et al., 2016 ). In a study conducted by Grela et al.…”

Section: Discussioncontrasting

confidence: 76%

“…(2010) as well. The investigations conducted by Carrasco et al. (2016) showed a significantly higher concentration of MUFA in egg yolks in all groups of hens receiving various forms of alfalfa silage than that in the control.…”

Section: Discussionmentioning

confidence: 87%

“…In a study conducted by Grela et al. (2014) , there was an increase in the n-6/n-3 ratio in the yolks from both APC-supplemented groups, whereas this parameter declined highly significantly in the yolks from hens receiving alfalfa silage in the study conducted by Carrasco et al. (2016) .…”

Section: Discussionmentioning

confidence: 88%

“…The researchers demonstrated that the addition of PX to the feed caused an over 10-fold increase in the content of lutein and β-carotene in the egg yolks of the experimental birds compared with the control. As shown by Carrasco et al. (2016) in laying hens kept in the organic rearing system and fed chopped, extruded, and pelleted alfalfa silage, the deposition of carotenoids in egg yolks may be dependent on the amount and availability of dietary lipids.…”

Section: Discussionmentioning

confidence: 99%

“…The same findings were reported in a study on hens kept in a free-range system with access to alfalfa-sown pastures ( Karsten et al., 2010 ). In turn, the yolks of eggs laid by laying hens kept in a free-range system and fed various forms of young alfalfa silage exhibited a significantly lower level of all individual saturated fatty acids and substantially lower total SFA content than the control group ( Carrasco et al., 2016 ).…”

Section: Discussionmentioning

confidence: 99%

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Effects of dietary alfalfa protein concentrate supplementation on performance, egg quality, and fatty acid composition of raw, freeze-dried, and hard-boiled eggs from Polbar laying hens

et al. 2020

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The aim of this study was to determine the effect of addition of alfalfa protein concentrate ( APC ) at the dose of 15 g or 30 g per 1 kg of complete feed ration for the native Polbar breed on selected production traits and the fatty acid profile in the yolk of raw, hard-boiled or freeze-dried eggs. Laying hens were assigned randomly to 3 experimental groups, each comprising 30 birds. The control group received a standard diet without the APC addition and the experimental groups received APC, which partially replaced postextraction soybean meal. Egg laying performance, feed intake, and feed conversion ratio were controlled throughout the experiment. At 33 wk of age, 45 eggs were randomly selected for assessment of the quality of the egg content and eggshell, and 30 eggs were taken for each of the cooking and freeze-drying treatments. The fatty acid composition was determined in the yolks of hard-boiled, freeze-dried, and raw eggs. There was no effect of the APC addition on the laying performance, feed intake and feed conversion ratio, and a majority of egg quality traits. Hens fed with the APC laid eggs with a darker colored eggshell and yolk and a slightly lower breaking strength. The yolks in the eggs from hens receiving the APC addition were characterized by distinctly higher content of polyunsaturated fatty acids ( PUFA ). The group fed with a higher dose of APC produced eggs with a substantially lower level of saturated fatty acids ( SFA ). Boiling resulted in an increase in the SFA content and a decline in the level of PUFAs and carotenoids. Freeze-drying led to an increase in the total SFA content and a decrease in the level of n-3 PUFA. The APC addition to feed can replace the genetically modified soybean meal without reducing the values of production traits and egg quality and with a beneficial effect on the yolk color and fatty acid profile.

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Section: Discussioncontrasting

confidence: 76%

Section: Discussionmentioning

confidence: 87%