Biswas Ashraf, Khan Ajmal, Luo Dongwen, Jonker Arjan
AgResearch Limited, Grasslands Research Centre, Palmerston North 4410, New Zealand.
Department of Animal Science and Nutrition, Chattogram Veterinary and Animal Science University, Khulshi-4225, Chattogram, Bangladesh.
JDS Commun. 2022 May 5;3(4):255-259. doi: 10.3168/jdsc.2021-0184. eCollection 2022 Jul.
The objective of the current study was to determine the relationship of daily CH emissions estimated during mealtime compared with measured daily CH emissions, and determine the relationship with feeding behavior, in growing heifers fed alfalfa silage in respiration chambers. Data from 8 growing cattle (Hereford × Holstein-Friesian) individually housed in 4 respiration chambers and fed ad libitum alfalfa silage delivered in Insentec feed-bins to record feeding behavior and intake were used. The 4 chambers are linked to 1 analyzer, which measures CH in each chamber approximately every 3 min. Each 3-min measurement was expressed as grams per day and averaged per 24 h or per time during a meal. A strong correlation (r = 0.88; determined using Deming regression) was observed between CH emissions (g/d) during mealtime (276 ± 22.7 g/d) and measured over 24 h (262 ± 24.0 g/d), without apparent systematic bias. Feeding behavior parameters that were correlated with CH yield (g/kg dry matter intake) in the current study were a negative correlation with the number of visits to the feed bin (r = -0.45), average meal size (r = -0.57), and average daily eating rate (r = -0.48). In summary, CH measured during meals was similar to 24-h measured CH output in growing heifers fed ad libitum alfalfa silage in respiration chambers, and some feeding behavior parameters, based on feed bin visits, explained some of the variation in CH yield between animals.
本研究的目的是确定在进餐期间估计的每日甲烷（CH）排放量与测量的每日CH排放量之间的关系，并确定其与饲养行为的关系，研究对象是在呼吸室中采食苜蓿青贮饲料的生长育成母牛。研究使用了8头生长育肥牛（赫里福德×荷斯坦-弗里生）的数据，这些牛单独饲养在4个呼吸室中，自由采食通过英斯泰克饲料槽输送的苜蓿青贮饲料，以记录饲养行为和采食量。这4个呼吸室与1台分析仪相连，该分析仪大约每3分钟测量一次每个呼吸室内的CH。每3分钟的测量值以每天克数表示，并按每24小时或每餐期间的时间进行平均。观察到进餐期间的CH排放量（克/天）（276±22.7克/天）与24小时测量值（262±24.0克/天）之间存在很强的相关性（r = 0.88；使用戴明回归法确定），且无明显的系统偏差。在本研究中，与CH产量（克/千克干物质摄入量）相关的饲养行为参数与到饲料槽的访问次数呈负相关（r = -0.45）、平均每餐食量（r = -0.57）和平均每日采食率（r = -0.48）。总之，在呼吸室中自由采食苜蓿青贮饲料的生长育成母牛，进餐期间测量的CH与24小时测量的CH产量相似，并且基于到饲料槽的访问次数的一些饲养行为参数解释了动物之间CH产量的部分差异。
