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首页> 外文期刊>Journal of Animal Physiology and Animal Nutrition >Sand intake by laying hens and its effect on egg production parameters.
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Sand intake by laying hens and its effect on egg production parameters.

机译：蛋鸡采砂及其对产蛋参数的影响。

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摘要

Soil intake may be the most prominent source of environmental contaminants for free range and organic hens, but there are no quantitative data concerning soil intake by domestic hens. Consumption of soil of 14-32 g a day can be estimated from literature, but such a dilution of nutrient intake seems incompatible with high productivity. In this study laying hens were fed pelleted diets with 0%, 10%, 20%, 25% and 30% of sand addition to determine its effect on productivity. Feed intake, feed and nutrient (feed minus sand) conversion ratio, egg production, egg weight and body weight gain were measured over a 4-week period. Acid insoluble ash concentration in the faeces was measured to determine the accuracy of estimating the soil ingestion by the soil-ingestion equation for wildlife as a way to determine soil ingestion of free range and organic hens under practical circumstances. The hens were able to compensate the dilution of the diet with 20%, 25% and 30% of sand by increasing their feed intake. Feed intake increased significantly and feed to egg conversion ratio decreased significantly with increasing sand levels in the diet. The nutrient to egg conversion ratio of the diet without sand tended to be worse than for the diets with sand, presumably due to the total absence of coarse material in the diet. There were no differences in egg production and egg weight between hens fed the different diets but body weight gain was significantly lower for the hens fed the diets with 20%, 25% and 30% of sand. Estimation of sand ingestion was done by the soil-ingestion equation for wildlife. Provided that the actual dry matter digestibility coefficient of the nutrient part of the diet is taken into account, estimating the soil ingestion according to the soil-ingestion equation for wildlife seems an appropriate way to determine soil ingestion for free range and organic hens under practical circumstances.
机译：土壤摄入可能是自由放养和有机母鸡环境污染物的最主要来源，但是没有关于母鸡土壤摄入的定量数据。可以从文献中估计每天消耗14-32 g的土壤，但是这种营养摄入的稀释似乎与高生产率不相容。在这项研究中，给蛋鸡饲喂添加了0％，10％，20％，25％和30％沙的颗粒饲料，以确定其对生产率的影响。在4周的时间内测量了饲料的摄入量，饲料和养分（饲料减去沙子）的转化率，产蛋量，蛋重和体重增加。测量粪便中酸不溶性灰分的浓度，以确定野生动植物的土壤摄入方程式估算土壤摄入的准确性，以此作为在实际情况下确定自由放养和有机母鸡土壤摄入的方法。母鸡能够通过增加采食量来补偿日粮中20％，25％和30％的沙子稀释。随着日粮中沙子含量的增加，饲料摄入量显着增加，饲料与鸡蛋的转化率显着降低。不加砂饮食的营养成分与鸡蛋的转化率往往比含砂饮食的营养成分对鸡蛋的转化率更差，这可能是由于饮食中完全没有粗物质的缘故。饲喂不同日粮的母鸡的产蛋量和蛋重没有差异，但是饲喂日粮为20％，25％和30％沙的母鸡的体重增加显着较低。沙土摄入量的估算是通过野生动物的土壤摄入方程来完成的。如果考虑到饮食中营养成分的实际干物质消化系数，则根据实际情况根据野生动物的土壤摄入方程估算土壤摄入似乎是确定自由放养和有机母鸡土壤摄入的合适方法。 。

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