The effect of an energy additive on the metabolism of cattle

The objective of this study was to determine the effect of an energy additive on the metabolism of cattle. This article provides information on the analysis of the diet of young cattle calculated for when the animals were both indoors and outdoors. The ration was prepared for 40 heifers, divided into 4 groups consisting of 10 animals in each group. Three of these groups were fed different amounts of a high-energy additive, which was not fed to the control group. The effectiveness of the additive was analyzed according to the balance experiment and by calculating digestibility coefficients. It was determined that the percentage of nitrogen use in young animals was higher in the groups that were fed the additive than in the control group. Increasing the dose of the additive increased the level of nitrogen use. Comparative analysis of live weight indicated intergroup differences in favor of heifers in the groups that were fed the additive of 1.34% to 2.41% at the age of 9 mo; 2.51% to 4.16% at 12 mo; 3.14% to 5.46% at 15 mo; and 3.57% to 6.30% at 18 mo. The average daily growth dynamics indicated a gradual increase in all animals up to 15 mo, with a slight decrease by 18 mo of age. The difference among the groups ranged from 5.08% to 8.85% at 6 to 9 mo of age; 7.08% to 10.79% at 9 to 12 mo; 5.64% to 10.97% at 12 to 15 mo; and 6.05% to 11.11% at 18 mo. It was concluded that feeding the energy additive Tanrem to heifers increased their metabolism so that nitrogen use was improved, and feed was digested more efficiently, which in turn improved the growth of animals. Using an energy additive at the mid-range dose of 500 g a day per animal is recommended, since the effect was similar at the mid-range and maximum dosages.     

保加利亚主要鲜食葡萄品种评价

保加利亚位于巴尔干半岛的东南部．属于温带气候．北部略受大陆性气候影响,南部带有地中海气候特点．气候和土壤等自然条件非常适宜葡萄种植．是世界著名的葡萄与葡萄酒生产国之一。长期以来．保加利亚的农业科研机构非常注重鲜食葡萄品种的选育研究．     

保加利亚的苹果生产与研究

保加利亚气候条件非常适宜苹果生长.1968年保加利亚苹果种植面积为3.04万hm2,但近年由于土地改革,苹果种植面积持续减少,现仅存5393hm2.笔者介绍了目前保加利亚苹果的种植面积、产量、主栽品种、砧木、树形及研究状况.     

保加利亚优良甜樱桃品种评价研究

樱桃是保加利亚主要栽培的果树树种,栽培面积近0．53万hm2。占全国果树总面积的16．5％。保加利亚农业研究所位于保加利亚著名的樱桃产区丘斯坦帝尔地区,一直从事于樱桃新品种的选育研究,樱桃主要育种目标是果个大、高产、晚花或抗花期霜冻害、自花结实,并通过杂交育种技术选育出一系列综合性状优良的甜樱桃新品种。现将甜樱桃新品种的主要性状总结如下。     

适合不套袋栽培的优良苹果品种筛选研究

研究不同苹果品种在套袋和不套袋情况下果实的外观和内在品质,认为‘红露’、‘瑞维纳’、‘新世界’、‘华金’、‘青香’5个品种在套袋和不套袋情况下果实表光较好,适宜作为不套袋栽培的苹果品种进行推广利用。同时,研究5个品种的植物学性状、生物学性状、抗逆性以及套袋和不套袋果实的外观和内在品质,不套袋果实的可溶性固形物含量、硬度、口感和风味均显著好于套袋果实。     

贴梗海棠主要果实营养成分分析

贴梗海棠是蔷薇科木瓜属植物,花梗极短,花朵紧贴在枝干上,鲜艳漂亮,是理想的园林绿化植物;果实作中药材使用时简称木瓜,富含Vc和丰富的蛋白质,有舒筋活络和化湿功能,具有极高的食用价值和药用价值。本试验重点测定了8个不同类型贴梗海棠果实的抗坏血酸维生素C、单宁酸和干物质等指标含量,以期筛选高营养和保健价值较高的