Martin Malia J, Weigel Kent A, White Heather M
Department of Animal and Dairy Sciences, University of Wisconsin-Madison, Madison, WI 53706, USA.
Animals (Basel). 2021 May 13;11(5):1385. doi: 10.3390/ani11051385.
The objective of this study was to investigate the relationships between postpartum health disorders and mid-lactation performance, feed efficiency, and sensor-derived behavioral traits. Multiparous cows ( = 179) were monitored for health disorders for 21 days postpartum and enrolled in a 45-day trial between 50 to 200 days in milk, wherein feed intake, milk yield and components, body weight, body condition score, and activity, lying, and feeding behaviors were recorded. Feed efficiency was measured as residual feed intake and the ratio of fat- or energy-corrected milk to dry matter intake. Cows were classified as either having hyperketonemia (HYK; = 72) or not ( = 107) and grouped by frequency of postpartum health disorders: none (HLT; = 94), one (DIS; = 63), or ≥2 (DIS+; = 22). Cows that were diagnosed with HYK had higher mid-lactation yields of fat- and energy-corrected milk. No differences in feed efficiency were detected between HYK or health status groups. Highly active mid-lactation time was higher in healthy animals, and rumination time was lower in ≥4th lactation cows compared with HYK or DIS and DIS+ cows. Differences in mid-lactation behaviors between HYK and health status groups may reflect the long-term impacts of health disorders. The lack of a relationship between postpartum health and mid-lactation feed efficiency indicates that health disorders do not have long-lasting impacts on feed efficiency.
本研究的目的是调查产后健康障碍与泌乳中期性能、饲料效率以及传感器衍生行为特征之间的关系。对经产奶牛（n = 179）产后21天的健康障碍情况进行监测，并在产奶50至200天期间进行为期45天的试验，记录其采食量、产奶量及成分、体重、体况评分以及活动、躺卧和采食行为。饲料效率通过剩余采食量以及脂肪校正乳或能量校正乳与干物质采食量的比率来衡量。奶牛被分为患有高酮血症（HYK；n = 72）或未患高酮血症（n = 107）两组，并根据产后健康障碍的频率进行分组：无健康障碍（HLT；n = 94）、有一次健康障碍（DIS；n = 63）或≥2次健康障碍（DIS+；n = 22）。被诊断患有高酮血症的奶牛在泌乳中期的脂肪校正乳和能量校正乳产量较高。在高酮血症组或健康状况组之间未检测到饲料效率的差异。健康动物泌乳中期的高活动时间较长，与高酮血症组或一次及以上健康障碍组（DIS和DIS+）的奶牛相比，第4胎及以上奶牛的反刍时间较短。高酮血症组与健康状况组之间泌乳中期行为的差异可能反映了健康障碍的长期影响。产后健康与泌乳中期饲料效率之间缺乏关联，这表明健康障碍对饲料效率没有长期影响。
