Silage and haylage as forage in slow and fast-growing broilers – effects on performance in Campylobacter jejuni infected birds

ABSTRACT

1. This study investigated the effects of daily intake of silage or haylage on broiler production performance and organ development. Furthermore, effects of daily intake of Lactobacillus plantarum either via silage or by supplemented drinking water, on Campylobacter jejuni loads in faeces were studied.

2. To test this, a 42-d experiment using Ross 308 and a 63-d experiment with Rowan Rangers hybrids, were performed. Silage inoculated with L. plantarum strain 256 and haylage were fed in total mixed rations with mixtures of 85% of pellets and 15% of respective forage (DM-based weight). Feed intake (FI), forage intake, body weight (BW) and feed conversion ration (FCR) were monitored weekly. Mortality was recorded daily, and organ weights were registered at slaughter. Quantification of C. jejuni was performed by colony counts from faecal samples after culture on agar plates.

3. There was a negative effect of haylage on BW and FI in the fast-growing Ross 308 hybrid. Silage had a negative effect on BW only on week four and six. Water inoculated with L. plantarum 256 increased BW in the starter period. Interestingly, no significant adverse effect of forage inclusion was observed in the Rowan Ranger birds.

4. Relative weight of the emptied gizzard was higher in both Ross 308 and Rowan Ranger birds fed haylage and silage than in the control group. In Ross 308 birds, both forages significantly reased the relative weight of gizzard with digestive content when compared to birds fed solely pellets.

5. In both studies, higher consumption of silage than haylage was observed.

6. In conclusion, daily intake of L. plantarum 256 either via silage or supplemented in drinking water, was not effective in reducing the shedding of C. jejuni in either Ross 308 or Rowan Ranger hybrids at the end of the rearing period.     

罗斯308祖代肉种鸡生长期性能监测和生长曲线拟合

选用从美国安伟捷公司引进的1日龄罗斯308祖代D系肉种鸡10 823只,监测其0~20周的生长性能和生活力性状,并采用Logistic、Gompertz和Von Bertalanffy 3种非线性数学模型对其生长曲线进行拟合。结果表明:罗斯308祖代D系肉种鸡在良好的饲养管理下生长发育正常、均匀度较高,死淘率低;3种数学模型均能很好地拟合罗斯祖代D系肉种鸡的生长曲线,拟合度均在0.98以上,比较拟合度、成熟体重、生长拐点、最大周增重等指标,以Von Bertalanffy方程的拟合效果为最佳。     

早籼杂交稻潢优308丰产稳产性及适应性分析

利用2016—2017年福建省早稻区域试验和生产试验资料,对新育成的早籼杂交稻潢优308的丰产性、稳产性及适应性进行分析。结果表明:潢优308具有很好的丰产性,高产稳产性好,适宜种植的区域广及适应性强,是一个具有推广应用价值和超高产潜力的早籼杂交稻新品种,可在福建全省及周边同类型地区作早稻大面积推广应用。     

超级杂交稻五优308根系形态特征研究

对五优308在不同生育时期的根系形态特征及其与常规超级稻合美占的差异进行了分析。结果表明:除苗期外,五优308单株不定根数和总根长在各生育时期都比合美占具有明显优势,但单茎根系及单条不定根性状与合美占的差异不明显。五优308与合美占单株根数和总根长的差异主要是由于分蘖特性的差异所致。在超级稻育种中,可在选择适宜茎蘖数量的基础上,注重选择单茎根数较多和单条不定根长较长的品种。     

广东中北部超级稻五优308强化栽培技术

通过几年来的试验和推广示范,总结出五优308的强化栽培技术,以指导广东中北部和北部地区的水稻生产.     

水稻五优1号群体结构与产量及米质关系的研究

根据两年试验结果表明,五优1号水稻品种最佳经济氮肥施用量为125.9～139.4kg/hm2,最佳插秧密度为21.7穴/m2。千粒重和成熟度与碾米品质分别呈显著和极显著相关。氮肥施用量与蛋白质和直链淀粉含量呈曲线关系,氮肥施用量112.8kg/hm2的条件下可使蛋白质含量达到最高,其值为8.08%;氮肥施用量128.9kg/hm2处理下直链淀粉最高含量为18.0%。密度与蛋白质和直链淀粉含量呈曲线关系,16.8穴/m2密度下蛋白质最高含量为8.2%;密度16.3穴/m2,直链淀粉最高含量为18.2%。     

玉米新品种“吉农玉308”选育报告

玉米新品种"吉农玉308"是以自选系"GS02"为母本、"GS03"为父本杂交育成的玉米单交种.2年区域试验结果:平均产量为10 505.0 kg/hm2,比对照增产8.9%;生产试验结果:平均产量为9588.9 kg/hm2,比对照"平全13"增产3.5%.该品种2008年1月通过吉林省农作物品种审定委员会审定,其主要特点是高产、抗病、抗旱、品质好,适合吉林省中晚熟地区及黑龙江省部分地区种植.     

淀粉加工型马铃薯新品种东农308 的选育

东农308 是利用新型栽培种质资源进行有性杂交选育而成的淀粉加工专用型马铃薯新品种。中晚熟,出苗至收获98 d（天）左右;块茎圆形,黄皮淡黄肉,芽眼深度中等;块茎干物质含量26.8%,淀粉17.2%,粗蛋白2.23%,还原糖0.26%,VC 132 mg·kg^-1;中抗马铃薯轻花叶病毒病（PVX）,抗马铃薯重花叶病毒病（PVY）、晚疫病,田间有轻微晚疫病发生;适宜在黑龙江省、吉林省和内蒙古呼伦贝尔市等东北一季作区种植。     

玉米杂交种吉新308的育种构想与实践

本文介绍了选育吉新308玉米的育种目标、选育方法、组配模式等方面思路及吉新308的品种特点。     

罗斯308肉鸡最佳生长模型的建立

为了掌握罗斯308肉鸡的生长发育规律,随机抽测0~5周龄罗斯308肉鸡60只,进行了体重测量、生长模型拟合和生长发育指标计算。结果表明:Gompertz模型为最佳模型,von Bertalanffy模型次之,Logistic模型拟合效果最差。建立的Gompertz模型参数A、B、k分别为6594.35、4.69、0.25(R^2为0.9994),获得的拐点日龄为42.05d,拐点周龄为6.01周,拐点体重为2425.93g,最大日增重为89.27g,最大周增重为624.92g。此研究结果可作为合理饲养罗斯308肉鸡的重要参考。