Relationships between energy balance and health traits of dairy cattle in early lactation
Relationships between energy balance and health traits of dairy cattle in early lactation
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DOI：
10.3168/jds.s0022-0302(00)75162-9
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发表时间：
2000-11-01
影响因子：
3.5
通讯作者：
Schaeffer, LR
中科院分区：
文献类型：
--
作者：
Collard, BL;Boettcher, PJ;Schaeffer, LR
本研究的目的是计算表型之间的关系能量平衡在泌乳早期和健康和繁殖的哺乳期。数据为26，701份每日干物质摄入量和产奶量记录，定期测量牛奶成分和体重，以及140头经产荷斯坦奶牛的所有健康和生殖信息。每日能量平衡通过将饲料摄入量乘以日粮的能量浓度并减去维持所需的能量（基于胎次和体重）和产奶量（基于产量和脂肪、蛋白质和乳糖的浓度）来计算。能量平衡的六个措施被定义为：平均每日能量平衡在第一个20，50和100天的哺乳期;最低每日能量平衡;天在负能量平衡;和总能量赤字。健康指标是哺乳期出现以下每种情况的次数：所有乳房问题、乳腺炎、所有运动问题、蹄叶炎、消化问题和生殖问题。繁殖性状为首次观察到发情的天数和授精次数。能量平衡和健康之间的几个显着的关系进行了观察。消化和运动问题的增加与更长和更极端的负能量平衡时期有关。
The objective of the study was to calculate phenotypic relationships between energy balance in early lactation and health and reproduction in that lactation. Data were 26,701 daily records of dry matter intake and milk production, periodic measures of milk composition and body weight, and all health and reproductive information from 140 multiparous Holstein cows. Daily energy balance was calculated by multiplying feed intake by the concentration of energy of the ration and subtracting the amount of energy required for maintenance (based on parity and body weight) and for milk production (based on yield and concentrations of fat, protein, and lactose). Six measures of energy balance were defined: mean daily energy balance during the first 20, 50, and 100 d of lactation; minimum daily energy balance; days in negative energy balance; and total energy deficit. Measures of health were the numbers of occurrences of each of the following during lactation: all udder problems, mastitis, all locomotive problems, laminitis, digestive problems, and reproductive problems. Reproductive traits were the number of days to first observed estrus and number of inseminations. Several significant relationships between energy balance and health were observed. Increased digestive and locomotive problems were associated with longer and more extreme periods of negative energy balance.