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Tolerance Study for Standardized Macleaya cordata Extract Added to Chicken Layer Diet

A standardized Macleaya cordata extract preparation (MCEP; trade name Sangrovit®) can increase feed intake and therefore promote animal growth, meat quality and yield. The objective of this study was to assess the effects of Sangrovit® on the health status and egg laying parameters of layer chickens.

Layer chickens (N = 360) were randomly divided into four groups (90 birds/treatment, 10 birds/pen) and fed either a standard basal feed (T1) or a basal diet that was supplemented with 100 mg/kg (T2), 500 mg/kg (T3) or 1000 mg/kg (T4) Sangrovit® (providing 0, 3.7, 18.5, and 37.0 mg MCE/kg feed, respectively) for 56 consecutive days. Live Weight (LW), Average Daily Feed Intake (ADFI) and the Feed Conversion Ratios (FCR) were calculated during the study, and biochemical and hematological endpoints were obtained at the end of the study (Day 56). Eggs were analyzed for the isoquinoline alkaloids sanguinarine and chelerythrine.

No statistically significant (P > 0.05) differences were found between control and treatment groups for LW, ADFI and FCR. There was a significant increase in the % laying in groups T3 and T4 for the study overall, but no significant differences in egg size during the study. Blood biochemical analyses showed a near-significant trend for decreased bilirubin in the T2 and T4 groups, but this was not dose-dependent and not considered treatment-related. The percent hemoglobin was significantly decreased in the high dose group, but was not considered treatment-related as it was not a dose-dependent effect. No treatment-related changes were found after necropsy of the selected organs. No quantifiable sanguinarine or chelerythrine was found in the eggs after 56 days administration of the MCE preparation to the hens.

In conclusion, the results of the study showed no adverse effects of consumption of the standardized MCEP provided to layer chickens when administered in the feed at 100, 500 and 1000 mg/kg feed for 56 days, as compared with control birds. No residual levels of sanguinarine or chelerythrine were found in the eggs. Besides, the current work confirmed that consumption of this MCE preparation when added at up to 1000 mg/kg feed for 56 days was well tolerated by laying chickens and that neither sanguinarine nor chelerythrine were transferred to the eggs.

Article by Ray A. Matulka, et al, from USA, Germany and Italy.

Full access: http://mrw.so/p2hOT
Image by Elise de Korte, from Flickr-cc.

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